summaryrefslogtreecommitdiff
path: root/Configure
blob: 7738073455becf5fab4dbeaf587e3d3d202d05b0 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
3193
3194
3195
3196
3197
3198
3199
3200
3201
3202
3203
3204
3205
3206
3207
3208
3209
3210
3211
3212
3213
3214
3215
3216
3217
3218
3219
3220
3221
3222
3223
3224
3225
3226
3227
3228
3229
3230
3231
3232
3233
3234
3235
3236
3237
3238
3239
3240
3241
3242
3243
3244
3245
3246
3247
3248
3249
3250
3251
3252
3253
3254
3255
3256
3257
3258
3259
3260
3261
3262
3263
3264
3265
3266
3267
3268
3269
3270
3271
3272
3273
3274
3275
3276
3277
3278
3279
3280
3281
3282
3283
3284
3285
3286
3287
3288
3289
3290
3291
3292
3293
3294
3295
3296
3297
3298
3299
3300
3301
3302
3303
3304
3305
3306
3307
3308
3309
3310
3311
3312
3313
3314
3315
3316
3317
3318
3319
3320
3321
3322
3323
3324
3325
3326
3327
3328
3329
3330
3331
3332
3333
3334
3335
3336
3337
3338
3339
#! /usr/bin/env perl
# -*- mode: perl; -*-
# Copyright 2016-2020 The OpenSSL Project Authors. All Rights Reserved.
#
# Licensed under the Apache License 2.0 (the "License").  You may not use
# this file except in compliance with the License.  You can obtain a copy
# in the file LICENSE in the source distribution or at
# https://www.openssl.org/source/license.html

##  Configure -- OpenSSL source tree configuration script

use 5.10.0;
use strict;
use Config;
use FindBin;
use lib "$FindBin::Bin/util/perl";
use File::Basename;
use File::Spec::Functions qw/:DEFAULT abs2rel rel2abs splitdir/;
use File::Path qw/mkpath/;
use OpenSSL::fallback "$FindBin::Bin/external/perl/MODULES.txt";
use OpenSSL::Glob;
use OpenSSL::Template;

# see INSTALL.md for instructions.

my $orig_death_handler = $SIG{__DIE__};
$SIG{__DIE__} = \&death_handler;

my $usage="Usage: Configure [no-<cipher> ...] [enable-<cipher> ...] [-Dxxx] [-lxxx] [-Lxxx] [-fxxx] [-Kxxx] [no-hw-xxx|no-hw] [[no-]threads] [[no-]shared] [[no-]zlib|zlib-dynamic] [no-asm] [no-egd] [sctp] [386] [--prefix=DIR] [--openssldir=OPENSSLDIR] [--with-xxx[=vvv]] [--config=FILE] os/compiler[:flags]\n";

# Options:
#
# --config      add the given configuration file, which will be read after
#               any "Configurations*" files that are found in the same
#               directory as this script.
# --prefix      prefix for the OpenSSL installation, which includes the
#               directories bin, lib, include, share/man, share/doc/openssl
#               This becomes the value of INSTALLTOP in Makefile
#               (Default: /usr/local)
# --openssldir  OpenSSL data area, such as openssl.cnf, certificates and keys.
#               If it's a relative directory, it will be added on the directory
#               given with --prefix.
#               This becomes the value of OPENSSLDIR in Makefile and in C.
#               (Default: PREFIX/ssl)
#
# --cross-compile-prefix Add specified prefix to binutils components.
#
# --api         One of 0.9.8, 1.0.0, 1.0.1, 1.0.2, 1.1.0, 1.1.1, or 3.0
#               Define the public APIs as they were for that version
#               including patch releases.  If 'no-deprecated' is also
#               given, do not compile support for interfaces deprecated
#               up to and including the specified OpenSSL version.
#
# no-hw-xxx     do not compile support for specific crypto hardware.
#               Generic OpenSSL-style methods relating to this support
#               are always compiled but return NULL if the hardware
#               support isn't compiled.
# no-hw         do not compile support for any crypto hardware.
# [no-]threads  [don't] try to create a library that is suitable for
#               multithreaded applications (default is "threads" if we
#               know how to do it)
# [no-]shared   [don't] try to create shared libraries when supported.
# [no-]pic      [don't] try to build position independent code when supported.
#               If disabled, it also disables shared and dynamic-engine.
# no-asm        do not use assembler
# no-egd        do not compile support for the entropy-gathering daemon APIs
# [no-]zlib     [don't] compile support for zlib compression.
# zlib-dynamic  Like "zlib", but the zlib library is expected to be a shared
#               library and will be loaded in run-time by the OpenSSL library.
# sctp          include SCTP support
# no-uplink     Don't build support for UPLINK interface.
# enable-weak-ssl-ciphers
#               Enable weak ciphers that are disabled by default.
# 386           generate 80386 code in assembly modules
# no-sse2       disables IA-32 SSE2 code in assembly modules, the above
#               mentioned '386' option implies this one
# no-<cipher>   build without specified algorithm (rsa, idea, rc5, ...)
# -<xxx> +<xxx> All options which are unknown to the 'Configure' script are
# /<xxx>        passed through to the compiler. Unix-style options beginning
#               with a '-' or '+' are recognized, as well as Windows-style
#               options beginning with a '/'. If the option contains arguments
#               separated by spaces, then the URL-style notation %20 can be
#               used for the space character in order to avoid having to quote
#               the option. For example, -opt%20arg gets expanded to -opt arg.
#               In fact, any ASCII character can be encoded as %xx using its
#               hexadecimal encoding.
# -static       while -static is also a pass-through compiler option (and
#               as such is limited to environments where it's actually
#               meaningful), it triggers a number configuration options,
#               namely no-pic, no-shared and no-threads. It is
#               argued that the only reason to produce statically linked
#               binaries (and in context it means executables linked with
#               -static flag, and not just executables linked with static
#               libcrypto.a) is to eliminate dependency on specific run-time,
#               a.k.a. libc version. The mentioned config options are meant
#               to achieve just that. Unfortunately on Linux it's impossible
#               to eliminate the dependency completely for openssl executable
#               because of getaddrinfo and gethostbyname calls, which can
#               invoke dynamically loadable library facility anyway to meet
#               the lookup requests. For this reason on Linux statically
#               linked openssl executable has rather debugging value than
#               production quality.
#
# BN_LLONG      use the type 'long long' in crypto/bn/bn.h
# RC4_CHAR      use 'char' instead of 'int' for RC4_INT in crypto/rc4/rc4.h
# Following are set automatically by this script
#
# MD5_ASM       use some extra md5 assembler,
# SHA1_ASM      use some extra sha1 assembler, must define L_ENDIAN for x86
# RMD160_ASM    use some extra ripemd160 assembler,
# SHA256_ASM    sha256_block is implemented in assembler
# SHA512_ASM    sha512_block is implemented in assembler
# AES_ASM       AES_[en|de]crypt is implemented in assembler

# Minimum warning options... any contributions to OpenSSL should at least
# get past these.  Note that we only use these with C compilers, not with
# C++ compilers.

# DEBUG_UNUSED enables __owur (warn unused result) checks.
# -DPEDANTIC complements -pedantic and is meant to mask code that
# is not strictly standard-compliant and/or implementation-specific,
# e.g. inline assembly, disregards to alignment requirements, such
# that -pedantic would complain about. Incidentally -DPEDANTIC has
# to be used even in sanitized builds, because sanitizer too is
# supposed to and does take notice of non-standard behaviour. Then
# -pedantic with pre-C9x compiler would also complain about 'long
# long' not being supported. As 64-bit algorithms are common now,
# it grew impossible to resolve this without sizeable additional
# code, so we just tell compiler to be pedantic about everything
# but 'long long' type.

my @gcc_devteam_warn = qw(
    -DDEBUG_UNUSED
    -DPEDANTIC -pedantic -Wno-long-long
    -Wall
    -Wextra
    -Wno-unused-parameter
    -Wno-missing-field-initializers
    -Wswitch
    -Wsign-compare
    -Wshadow
    -Wformat
    -Wtype-limits
    -Wundef
    -Werror
    -Wmissing-prototypes
    -Wstrict-prototypes
);

# These are used in addition to $gcc_devteam_warn when the compiler is clang.
# TODO(openssl-team): fix problems and investigate if (at least) the
# following warnings can also be enabled:
#       -Wcast-align
#       -Wunreachable-code -- no, too ugly/compiler-specific
#       -Wlanguage-extension-token -- no, we use asm()
#       -Wunused-macros -- no, too tricky for BN and _XOPEN_SOURCE etc
#       -Wextended-offsetof -- no, needed in CMS ASN1 code
my @clang_devteam_warn = qw(
    -Wno-unknown-warning-option
    -Wswitch-default
    -Wno-parentheses-equality
    -Wno-language-extension-token
    -Wno-extended-offsetof
    -Wconditional-uninitialized
    -Wincompatible-pointer-types-discards-qualifiers
    -Wmissing-variable-declarations
);

my @cl_devteam_warn = qw(
    /WX
);

my $strict_warnings = 0;

# As for $BSDthreads. Idea is to maintain "collective" set of flags,
# which would cover all BSD flavors. -pthread applies to them all,
# but is treated differently. OpenBSD expands is as -D_POSIX_THREAD
# -lc_r, which is sufficient. FreeBSD 4.x expands it as -lc_r,
# which has to be accompanied by explicit -D_THREAD_SAFE and
# sometimes -D_REENTRANT. FreeBSD 5.x expands it as -lc_r, which
# seems to be sufficient?
our $BSDthreads="-pthread -D_THREAD_SAFE -D_REENTRANT";

#
# API compatibility name to version number mapping.
#
my $apitable = {
    # This table expresses when API additions or changes can occur.
    # The numbering used changes from 3.0 and on because we updated
    # (solidified) our version numbering scheme at that point.

    # From 3.0 and on, we internalise the given version number in dedcimal
    # as MAJOR * 10000 + MINOR * 100 + 0
    "3.0.0" => 30000,
    "3.0"   => 30000,

    # Note that before 3.0, we didn't have the same version number scheme.
    # Still, the numbering we use here covers what we need.
    "1.1.1" => 10101,
    "1.1.0" => 10100,
    "1.0.2" => 10002,
    "1.0.1" => 10001,
    "1.0.0" => 10000,
    "0.9.8" =>   908,
};

our %table = ();
our %config = ();
our %withargs = ();
our $now_printing;      # set to current entry's name in print_table_entry
                        # (todo: right thing would be to encapsulate name
                        # into %target [class] and make print_table_entry
                        # a method)

# Forward declarations ###############################################

# read_config(filename)
#
# Reads a configuration file and populates %table with the contents
# (which the configuration file places in %targets).
sub read_config;

# resolve_config(target)
#
# Resolves all the late evaluations, inheritances and so on for the
# chosen target and any target it inherits from.
sub resolve_config;


# Information collection #############################################

# Unified build supports separate build dir
my $srcdir = catdir(absolutedir(dirname($0))); # catdir ensures local syntax
my $blddir = catdir(absolutedir("."));         # catdir ensures local syntax
my $dofile = abs2rel(catfile($srcdir, "util/dofile.pl"));

my $local_config_envname = 'OPENSSL_LOCAL_CONFIG_DIR';

$config{sourcedir} = abs2rel($srcdir);
$config{builddir} = abs2rel($blddir);

# Collect reconfiguration information if needed
my @argvcopy=@ARGV;

if (grep /^reconf(igure)?$/, @argvcopy) {
    die "reconfiguring with other arguments present isn't supported"
        if scalar @argvcopy > 1;
    if (-f "./configdata.pm") {
        my $file = "./configdata.pm";
        unless (my $return = do $file) {
            die "couldn't parse $file: $@" if $@;
            die "couldn't do $file: $!"    unless defined $return;
            die "couldn't run $file"       unless $return;
        }

        @argvcopy = defined($configdata::config{perlargv}) ?
            @{$configdata::config{perlargv}} : ();
        die "Incorrect data to reconfigure, please do a normal configuration\n"
            if (grep(/^reconf/,@argvcopy));
        $config{perlenv} = $configdata::config{perlenv} // {};
    } else {
        die "Insufficient data to reconfigure, please do a normal configuration\n";
    }
}

$config{perlargv} = [ @argvcopy ];

# Historical: if known directories in crypto/ have been removed, it means
# that those sub-systems are disabled.
# (the other option would be to removed them from the SUBDIRS statement in
# crypto/build.info)
# We reverse the input list for cosmetic purely reasons, to compensate that
# 'unshift' adds at the front of the list (i.e. in reverse input order).
foreach ( reverse sort( 'aes', 'aria', 'bf', 'camellia', 'cast', 'des', 'dh',
                        'dsa', 'ec', 'hmac', 'idea', 'md2', 'md5', 'mdc2',
                        'rc2', 'rc4', 'rc5', 'ripemd', 'rsa', 'seed', 'sha',
                        'sm2', 'sm3', 'sm4') ) {
    unshift @argvcopy, "no-$_" if ! -d catdir($srcdir, 'crypto', $_);
}

# Collect version numbers
my %version = ();

collect_information(
    collect_from_file(catfile($srcdir,'VERSION')),
    qr/\s*(\w+)\s*=\s*(.*?)\s*$/ =>
        sub {
            # Only define it if there is a value at all
            if ($2 ne '') {
                my $k = $1;
                my $v = $2;
                # Some values are quoted.  Trim the quotes
                $v = $1 if $v =~ /^"(.*)"$/;
                $version{uc $k} = $v;
            }
        },
    "OTHERWISE" =>
        sub { die "Something wrong with this line:\n$_\nin $srcdir/VERSION" },
    );

$config{major} = $version{MAJOR} // 'unknown';
$config{minor} = $version{MINOR} // 'unknown';
$config{patch} = $version{PATCH} // 'unknown';
$config{prerelease} =
    defined $version{PRE_RELEASE_TAG} ? "-$version{PRE_RELEASE_TAG}" : '';
$config{build_metadata} =
    defined $version{BUILD_METADATA} ? "+$version{BUILD_METADATA}" : '';
$config{shlib_version} = $version{SHLIB_VERSION} // 'unknown';
$config{release_date} = $version{RELEASE_DATE} // 'xx XXX xxxx';

$config{version} = "$config{major}.$config{minor}.$config{patch}";
$config{full_version} = "$config{version}$config{prerelease}$config{build_metadata}";

die "erroneous version information in VERSION: ",
    "$config{version}, $config{shlib_version}\n"
    unless (defined $version{MAJOR}
            && defined $version{MINOR}
            && defined $version{PATCH}
            && defined $version{SHLIB_VERSION});

# Collect target configurations

my $pattern = catfile(dirname($0), "Configurations", "*.conf");
foreach (sort glob($pattern)) {
    &read_config($_);
}

if (defined env($local_config_envname)) {
    if ($^O eq 'VMS') {
        # VMS environment variables are logical names,
        # which can be used as is
        $pattern = $local_config_envname . ':' . '*.conf';
    } else {
        $pattern = catfile(env($local_config_envname), '*.conf');
    }

    foreach (sort glob($pattern)) {
        &read_config($_);
    }
}

# Save away perl command information
$config{perl_cmd} = $^X;
$config{perl_version} = $Config{version};
$config{perl_archname} = $Config{archname};

$config{prefix}="";
$config{openssldir}="";
$config{processor}="";
$config{libdir}="";
my $auto_threads=1;    # enable threads automatically? true by default
my $default_ranlib;

# Known TLS and DTLS protocols
my @tls = qw(ssl3 tls1 tls1_1 tls1_2 tls1_3);
my @dtls = qw(dtls1 dtls1_2);

# Explicitly known options that are possible to disable.  They can
# be regexps, and will be used like this: /^no-${option}$/
# For developers: keep it sorted alphabetically

my @disablables = (
    "afalgeng",
    "aria",
    "asan",
    "asm",
    "async",
    "autoalginit",
    "autoerrinit",
    "autoload-config",
    "bf",
    "blake2",
    "buildtest-c++",
    "camellia",
    "capieng",
    "cast",
    "chacha",
    "cmac",
    "cmp",
    "cms",
    "comp",
    "crypto-mdebug",
    "ct",
    "deprecated",
    "des",
    "devcryptoeng",
    "dgram",
    "dh",
    "dsa",
    "dso",
    "dtls",
    "dynamic-engine",
    "ec",
    "ec2m",
    "ecdh",
    "ecdsa",
    "ec_nistp_64_gcc_128",
    "egd",
    "engine",
    "err",
    "external-tests",
    "filenames",
    "fips",
    "fuzz-libfuzzer",
    "fuzz-afl",
    "gost",
    "idea",
    "ktls",
    "legacy",
    "makedepend",
    "md2",
    "md4",
    "mdc2",
    "module",
    "msan",
    "multiblock",
    "nextprotoneg",
    "pinshared",
    "ocb",
    "ocsp",
    "padlockeng",
    "pic",
    "poly1305",
    "posix-io",
    "psk",
    "rc2",
    "rc4",
    "rc5",
    "rdrand",
    "rfc3779",
    "rmd160",
    "scrypt",
    "sctp",
    "secure-memory",
    "seed",
    "shared",
    "siphash",
    "siv",
    "sm2",
    "sm3",
    "sm4",
    "sock",
    "srp",
    "srtp",
    "sse2",
    "ssl",
    "ssl-trace",
    "static-engine",
    "stdio",
    "tests",
    "threads",
    "tls",
    "trace",
    "ts",
    "ubsan",
    "ui-console",
    "unit-test",
    "uplink",
    "whirlpool",
    "weak-ssl-ciphers",
    "zlib",
    "zlib-dynamic",
    );
foreach my $proto ((@tls, @dtls))
        {
        push(@disablables, $proto);
        push(@disablables, "$proto-method") unless $proto eq "tls1_3";
        }

# Internal disablables, for aliasing purposes.  They serve no special
# purpose here, but allow scripts to get to know them through configdata.pm,
# where these are merged with @disablables.
# The actual aliasing mechanism is done via %disable_cascades
my @disablables_int = qw(
    crmf
    );

my %deprecated_disablables = (
    "ssl2" => undef,
    "buf-freelists" => undef,
    "crypto-mdebug-backtrace" => undef,
    "hw" => "hw",               # causes cascade, but no macro
    "hw-padlock" => "padlockeng",
    "ripemd" => "rmd160",
    "ui" => "ui-console",
    "heartbeats" => undef,
    );

# All of the following are disabled by default:

our %disabled = ( # "what"         => "comment"
                  "asan"                => "default",
                  "buildtest-c++"       => "default",
                  "crypto-mdebug"       => "default",
                  "crypto-mdebug-backtrace" => "default",
                  "devcryptoeng"        => "default",
                  "ec_nistp_64_gcc_128" => "default",
                  "egd"                 => "default",
                  "external-tests"      => "default",
                  "fuzz-libfuzzer"      => "default",
                  "fuzz-afl"            => "default",
                  "md2"                 => "default",
                  "msan"                => "default",
                  "rc5"                 => "default",
                  "sctp"                => "default",
                  "ssl-trace"           => "default",
                  "ssl3"                => "default",
                  "ssl3-method"         => "default",
                  "trace"               => "default",
                  "ubsan"               => "default",
                  "unit-test"           => "default",
                  "weak-ssl-ciphers"    => "default",
                  "zlib"                => "default",
                  "zlib-dynamic"        => "default",
                  "ktls"                => "default",
                );

# Note: => pair form used for aesthetics, not to truly make a hash table
my @disable_cascades = (
    # "what"            => [ "cascade", ... ]
    sub { $config{processor} eq "386" }
                        => [ "sse2" ],
    "ssl"               => [ "ssl3" ],
    "ssl3-method"       => [ "ssl3" ],
    "zlib"              => [ "zlib-dynamic" ],
    "des"               => [ "mdc2" ],
    "ec"                => [ "ecdsa", "ecdh", "sm2", "gost" ],
    sub { $disabled{"ec"} && $disabled{"dh"} }
                        => [ "tls1_3" ],
    "dgram"             => [ "dtls", "sctp" ],
    "sock"              => [ "dgram" ],
    "dtls"              => [ @dtls ],
    sub { 0 == scalar grep { !$disabled{$_} } @dtls }
                        => [ "dtls" ],

    "tls"               => [ @tls ],
    sub { 0 == scalar grep { !$disabled{$_} } @tls }
                        => [ "tls" ],

    "crypto-mdebug"     => [ "crypto-mdebug-backtrace" ],

    # If no modules, then no dynamic engines either
    "module"            => [ "dynamic-engine" ],

    # Without shared libraries, dynamic engines aren't possible.
    # This is due to them having to link with libcrypto and register features
    # using the ENGINE functionality, and since that relies on global tables,
    # those *have* to be exacty the same as the ones accessed from the app,
    # which cannot be guaranteed if shared libraries aren't present.
    # (note that even with shared libraries, both the app and dynamic engines
    # must be linked with the same library)
    "shared"            => [ "dynamic-engine", "uplink" ],
    "dso"               => [ "dynamic-engine", "module" ],
    # Other modules don't necessarily have to link with libcrypto, so shared
    # libraries do not have to be a condition to produce those.

    # Without position independent code, there can be no shared libraries
    # or modules.
    "pic"               => [ "shared", "module" ],

    "module"            => [ "fips" ],

    "engine"            => [ grep /eng$/, @disablables ],
    "hw"                => [ "padlockeng" ],

    # no-autoalginit is only useful when building non-shared
    "autoalginit"       => [ "shared", "apps" ],

    "stdio"             => [ "apps", "capieng", "egd" ],
    "apps"              => [ "tests" ],
    "tests"             => [ "external-tests" ],
    "comp"              => [ "zlib" ],
    "sm3"               => [ "sm2" ],
    sub { !$disabled{"unit-test"} } => [ "heartbeats" ],

    sub { !$disabled{"msan"} } => [ "asm" ],

    sub { $disabled{cmac}; } => [ "siv" ],
    "legacy"                 => [ "md2" ],

    "cmp"               => [ "crmf" ],

    # Padlock engine uses low-level AES APIs which are deprecated
    sub { $disabled{"deprecated-3.0"} }
          => [ "padlockeng" ]
    );

# Avoid protocol support holes.  Also disable all versions below N, if version
# N is disabled while N+1 is enabled.
#
my @list = (reverse @tls);
while ((my $first, my $second) = (shift @list, shift @list)) {
    last unless @list;
    push @disable_cascades, ( sub { !$disabled{$first} && $disabled{$second} }
                              => [ @list ] );
    unshift @list, $second;
}
my @list = (reverse @dtls);
while ((my $first, my $second) = (shift @list, shift @list)) {
    last unless @list;
    push @disable_cascades, ( sub { !$disabled{$first} && $disabled{$second} }
                              => [ @list ] );
    unshift @list, $second;
}

# Explicit "no-..." options will be collected in %disabled along with the defaults.
# To remove something from %disabled, use "enable-foo".
# For symmetry, "disable-foo" is a synonym for "no-foo".

&usage if ($#ARGV < 0);

# For the "make variables" CPPINCLUDES and CPPDEFINES, we support lists with
# platform specific list separators.  Users from those platforms should
# recognise those separators from how you set up the PATH to find executables.
# The default is the Unix like separator, :, but as an exception, we also
# support the space as separator.
my $list_separator_re =
    { VMS           => qr/(?<!\^),/,
      MSWin32       => qr/(?<!\\);/ } -> {$^O} // qr/(?<!\\)[:\s]/;
# All the "make variables" we support
# Some get pre-populated for the sake of backward compatibility
# (we supported those before the change to "make variable" support.
my %user = (
    AR          => env('AR'),
    ARFLAGS     => [],
    AS          => undef,
    ASFLAGS     => [],
    CC          => env('CC'),
    CFLAGS      => [ env('CFLAGS') || () ],
    CXX         => env('CXX'),
    CXXFLAGS    => [ env('CXXFLAGS') || () ],
    CPP         => undef,
    CPPFLAGS    => [ env('CPPFLAGS') || () ],  # -D, -I, -Wp,
    CPPDEFINES  => [],  # Alternative for -D
    CPPINCLUDES => [],  # Alternative for -I
    CROSS_COMPILE => env('CROSS_COMPILE'),
    HASHBANGPERL=> env('HASHBANGPERL') || env('PERL'),
    LD          => undef,
    LDFLAGS     => [ env('LDFLAGS') || () ],  # -L, -Wl,
    LDLIBS      => [ env('LDLIBS') || () ],  # -l
    MT          => undef,
    MTFLAGS     => [],
    PERL        => env('PERL') || ($^O ne "VMS" ? $^X : "perl"),
    RANLIB      => env('RANLIB'),
    RC          => env('RC') || env('WINDRES'),
    RCFLAGS     => [ env('RCFLAGS') || () ],
    RM          => undef,
   );
# Info about what "make variables" may be prefixed with the cross compiler
# prefix.  This should NEVER mention any such variable with a list for value.
my @user_crossable = qw ( AR AS CC CXX CPP LD MT RANLIB RC );
# The same but for flags given as Configure options.  These are *additional*
# input, as opposed to the VAR=string option that override the corresponding
# config target attributes
my %useradd = (
    CPPDEFINES  => [],
    CPPINCLUDES => [],
    CPPFLAGS    => [],
    CFLAGS      => [],
    CXXFLAGS    => [],
    LDFLAGS     => [],
    LDLIBS      => [],
    RCFLAGS     => [],
   );

my %user_synonyms = (
    HASHBANGPERL=> 'PERL',
    RC          => 'WINDRES',
   );

# Some target attributes have been renamed, this is the translation table
my %target_attr_translate =(
    ar          => 'AR',
    as          => 'AS',
    cc          => 'CC',
    cxx         => 'CXX',
    cpp         => 'CPP',
    hashbangperl => 'HASHBANGPERL',
    ld          => 'LD',
    mt          => 'MT',
    ranlib      => 'RANLIB',
    rc          => 'RC',
    rm          => 'RM',
   );

# Initialisers coming from 'config' scripts
$config{defines} = [ split(/$list_separator_re/, env('__CNF_CPPDEFINES')) ];
$config{includes} = [ split(/$list_separator_re/, env('__CNF_CPPINCLUDES')) ];
$config{cppflags} = [ env('__CNF_CPPFLAGS') || () ];
$config{cflags} = [ env('__CNF_CFLAGS') || () ];
$config{cxxflags} = [ env('__CNF_CXXFLAGS') || () ];
$config{lflags} = [ env('__CNF_LDFLAGS') || () ];
$config{ex_libs} = [ env('__CNF_LDLIBS') || () ];

$config{openssl_api_defines}=[];
$config{openssl_sys_defines}=[];
$config{openssl_feature_defines}=[];
$config{options}="";
$config{build_type} = "release";
my $target="";

my %cmdvars = ();               # Stores FOO='blah' type arguments
my %unsupported_options = ();
my %deprecated_options = ();
# If you change this, update apps/version.c
my @known_seed_sources = qw(getrandom devrandom os egd none rdcpu librandom);
my @seed_sources = ();
while (@argvcopy)
        {
        $_ = shift @argvcopy;

        # Support env variable assignments among the options
        if (m|^(\w+)=(.+)?$|)
                {
                $cmdvars{$1} = $2;
                # Every time a variable is given as a configuration argument,
                # it acts as a reset if the variable.
                if (exists $user{$1})
                        {
                        $user{$1} = ref $user{$1} eq "ARRAY" ? [] : undef;
                        }
                #if (exists $useradd{$1})
                #       {
                #       $useradd{$1} = [];
                #       }
                next;
                }

        # VMS is a case insensitive environment, and depending on settings
        # out of our control, we may receive options uppercased.  Let's
        # downcase at least the part before any equal sign.
        if ($^O eq "VMS")
                {
                s/^([^=]*)/lc($1)/e;
                }

        # some people just can't read the instructions, clang people have to...
        s/^-no-(?!integrated-as)/no-/;

        # rewrite some options in "enable-..." form
        s /^-?-?shared$/enable-shared/;
        s /^sctp$/enable-sctp/;
        s /^threads$/enable-threads/;
        s /^zlib$/enable-zlib/;
        s /^zlib-dynamic$/enable-zlib-dynamic/;

        if (/^(no|disable|enable)-(.+)$/)
                {
                my $word = $2;
                if ($word !~ m|hw(?:-.+)| # special treatment for hw regexp opt
                        && !exists $deprecated_disablables{$word}
                        && !grep { $word eq $_ } @disablables)
                        {
                        $unsupported_options{$_} = 1;
                        next;
                        }
                }
        if (/^no-(.+)$/ || /^disable-(.+)$/)
                {
                foreach my $proto ((@tls, @dtls))
                        {
                        if ($1 eq "$proto-method")
                                {
                                $disabled{"$proto"} = "option($proto-method)";
                                last;
                                }
                        }
                if ($1 eq "dtls")
                        {
                        foreach my $proto (@dtls)
                                {
                                $disabled{$proto} = "option(dtls)";
                                }
                        $disabled{"dtls"} = "option(dtls)";
                        }
                elsif ($1 eq "ssl")
                        {
                        # Last one of its kind
                        $disabled{"ssl3"} = "option(ssl)";
                        }
                elsif ($1 eq "tls")
                        {
                        # XXX: Tests will fail if all SSL/TLS
                        # protocols are disabled.
                        foreach my $proto (@tls)
                                {
                                $disabled{$proto} = "option(tls)";
                                }
                        }
                elsif ($1 eq "static-engine")
                        {
                        delete $disabled{"dynamic-engine"};
                        }
                elsif ($1 eq "dynamic-engine")
                        {
                        $disabled{"dynamic-engine"} = "option";
                        }
                elsif (exists $deprecated_disablables{$1})
                        {
                        $deprecated_options{$_} = 1;
                        if (defined $deprecated_disablables{$1})
                                {
                                $disabled{$deprecated_disablables{$1}} = "option";
                                }
                        }
                elsif ($1 =~ m|hw(?:-.+)|) # deprecate hw options in regexp form
                        {
                        $deprecated_options{$_} = 1;
                        }
                else
                        {
                        $disabled{$1} = "option";
                        }
                # No longer an automatic choice
                $auto_threads = 0 if ($1 eq "threads");
                }
        elsif (/^enable-(.+)$/)
                {
                if ($1 eq "static-engine")
                        {
                        $disabled{"dynamic-engine"} = "option";
                        }
                elsif ($1 eq "dynamic-engine")
                        {
                        delete $disabled{"dynamic-engine"};
                        }
                elsif ($1 eq "zlib-dynamic")
                        {
                        delete $disabled{"zlib"};
                        }
                my $algo = $1;
                delete $disabled{$algo};

                # No longer an automatic choice
                $auto_threads = 0 if ($1 eq "threads");
                }
        elsif (/^--strict-warnings$/)
                {
                # Pretend that our strict flags is a C flag, and replace it
                # with the proper flags later on
                push @{$useradd{CFLAGS}}, '--ossl-strict-warnings';
                $strict_warnings=1;
                }
        elsif (/^--debug$/)
                {
                $config{build_type} = "debug";
                }
        elsif (/^--release$/)
                {
                $config{build_type} = "release";
                }
        elsif (/^386$/)
                { $config{processor}=386; }
        elsif (/^fips$/)
                {
                die "FIPS mode not supported\n";
                }
        elsif (/^rsaref$/)
                {
                # No RSAref support any more since it's not needed.
                # The check for the option is there so scripts aren't
                # broken
                }
        elsif (/^nofipscanistercheck$/)
                {
                die "FIPS mode not supported\n";
                }
        elsif (m|^[-+/]|)
                {
                if (/^--prefix=(.*)$/)
                        {
                        $config{prefix}=$1;
                        die "Directory given with --prefix MUST be absolute\n"
                                unless file_name_is_absolute($config{prefix});
                        }
                elsif (/^--api=(.*)$/)
                        {
                        my $api = $1;
                        die "Unknown API compatibility level $api"
                                unless defined $apitable->{$api};
                        $config{api}=$apitable->{$api};
                        }
                elsif (/^--libdir=(.*)$/)
                        {
                        $config{libdir}=$1;
                        }
                elsif (/^--openssldir=(.*)$/)
                        {
                        $config{openssldir}=$1;
                        }
                elsif (/^--with-zlib-lib=(.*)$/)
                        {
                        $withargs{zlib_lib}=$1;
                        }
                elsif (/^--with-zlib-include=(.*)$/)
                        {
                        $withargs{zlib_include}=$1;
                        }
                elsif (/^--with-fuzzer-lib=(.*)$/)
                        {
                        $withargs{fuzzer_lib}=$1;
                        }
                elsif (/^--with-fuzzer-include=(.*)$/)
                        {
                        $withargs{fuzzer_include}=$1;
                        }
                elsif (/^--with-rand-seed=(.*)$/)
                        {
                        foreach my $x (split(m|,|, $1))
                            {
                            die "Unknown --with-rand-seed choice $x\n"
                                if ! grep { $x eq $_ } @known_seed_sources;
                            push @seed_sources, $x;
                            }
                        }
                elsif (/^--cross-compile-prefix=(.*)$/)
                        {
                        $user{CROSS_COMPILE}=$1;
                        }
                elsif (/^--config=(.*)$/)
                        {
                        read_config $1;
                        }
                elsif (/^-l(.*)$/)
                        {
                        push @{$useradd{LDLIBS}}, $_;
                        }
                elsif (/^-framework$/)
                        {
                        push @{$useradd{LDLIBS}}, $_, shift(@argvcopy);
                        }
                elsif (/^-L(.*)$/ or /^-Wl,/)
                        {
                        push @{$useradd{LDFLAGS}}, $_;
                        }
                elsif (/^-rpath$/ or /^-R$/)
                        # -rpath is the OSF1 rpath flag
                        # -R is the old Solaris rpath flag
                        {
                        my $rpath = shift(@argvcopy) || "";
                        $rpath .= " " if $rpath ne "";
                        push @{$useradd{LDFLAGS}}, $_, $rpath;
                        }
                elsif (/^-static$/)
                        {
                        push @{$useradd{LDFLAGS}}, $_;
                        }
                elsif (m|^[-/]D(.*)$|)
                        {
                        push @{$useradd{CPPDEFINES}}, $1;
                        }
                elsif (m|^[-/]I(.*)$|)
                        {
                        push @{$useradd{CPPINCLUDES}}, $1;
                        }
                elsif (/^-Wp,$/)
                        {
                        push @{$useradd{CPPFLAGS}}, $1;
                        }
                else    # common if (/^[-+]/), just pass down...
                        {
                        # Treat %xx as an ASCII code (e.g. replace %20 by a space character).
                        # This provides a simple way to pass options with arguments separated
                        # by spaces without quoting (e.g. -opt%20arg translates to -opt arg).
                        $_ =~ s/%([0-9a-f]{1,2})/chr(hex($1))/gei;
                        push @{$useradd{CFLAGS}}, $_;
                        push @{$useradd{CXXFLAGS}}, $_;
                        }
                }
        elsif (m|^/|)
                {
                # Treat %xx as an ASCII code (e.g. replace %20 by a space character).
                # This provides a simple way to pass options with arguments separated
                # by spaces without quoting (e.g. /opt%20arg translates to /opt arg).
                $_ =~ s/%([0-9a-f]{1,2})/chr(hex($1))/gei;
                push @{$useradd{CFLAGS}}, $_;
                push @{$useradd{CXXFLAGS}}, $_;
                }
        else
                {
                die "target already defined - $target (offending arg: $_)\n" if ($target ne "");
                $target=$_;
                }
        unless ($_ eq $target || /^no-/ || /^disable-/)
                {
                # "no-..." follows later after implied deactivations
                # have been derived.  (Don't take this too seriously,
                # we really only write OPTIONS to the Makefile out of
                # nostalgia.)

                if ($config{options} eq "")
                        { $config{options} = $_; }
                else
                        { $config{options} .= " ".$_; }
                }
        }

if (keys %deprecated_options)
        {
        warn "***** Deprecated options: ",
                join(", ", keys %deprecated_options), "\n";
        }
if (keys %unsupported_options)
        {
        die "***** Unsupported options: ",
                join(", ", keys %unsupported_options), "\n";
        }

# If any %useradd entry has been set, we must check that the "make
# variables" haven't been set.  We start by checking of any %useradd entry
# is set.
if (grep { scalar @$_ > 0 } values %useradd) {
    # Hash of env / make variables names.  The possible values are:
    # 1 - "make vars"
    # 2 - %useradd entry set
    # 3 - both set
    my %detected_vars =
        map { my $v = 0;
              $v += 1 if $cmdvars{$_};
              $v += 2 if @{$useradd{$_}};
              $_ => $v }
        keys %useradd;

    # If any of the corresponding "make variables" is set, we error
    if (grep { $_ & 1 } values %detected_vars) {
        my $names = join(', ', grep { $detected_vars{$_} > 0 }
                               sort keys %detected_vars);
        die <<"_____";
***** Mixing make variables and additional compiler/linker flags as
***** configure command line option is not permitted.
***** Affected make variables: $names
_____
    }
}

# Check through all supported command line variables to see if any of them
# were set, and canonicalise the values we got.  If no compiler or linker
# flag or anything else that affects %useradd was set, we also check the
# environment for values.
my $anyuseradd =
    grep { defined $_ && (ref $_ ne 'ARRAY' || @$_) } values %useradd;
foreach (keys %user) {
    my $value = $cmdvars{$_};
    $value //= env($_) unless $anyuseradd;
    $value //=
        defined $user_synonyms{$_} ? $cmdvars{$user_synonyms{$_}} : undef;
    $value //= defined $user_synonyms{$_} ? env($user_synonyms{$_}) : undef
        unless $anyuseradd;

    if (defined $value) {
        if (ref $user{$_} eq 'ARRAY') {
            if ($_ eq 'CPPDEFINES' || $_ eq 'CPPINCLUDES') {
                $user{$_} = [ split /$list_separator_re/, $value ];
            } else {
                $user{$_} = [ $value ];
            }
        } elsif (!defined $user{$_}) {
            $user{$_} = $value;
        }
    }
}

if (grep { /-rpath\b/ } ($user{LDFLAGS} ? @{$user{LDFLAGS}} : ())
    && !$disabled{shared}
    && !($disabled{asan} && $disabled{msan} && $disabled{ubsan})) {
    die "***** Cannot simultaneously use -rpath, shared libraries, and\n",
        "***** any of asan, msan or ubsan\n";
}

sub disable {
    my $disable_type = shift;

    for (@_) {
        $disabled{$_} = $disable_type;
    }

    my @tocheckfor = (@_ ? @_ : keys %disabled);
    while (@tocheckfor) {
        my %new_tocheckfor = ();
        my @cascade_copy = (@disable_cascades);
        while (@cascade_copy) {
            my ($test, $descendents) =
                (shift @cascade_copy, shift @cascade_copy);
            if (ref($test) eq "CODE" ? $test->() : defined($disabled{$test})) {
                foreach (grep { !defined($disabled{$_}) } @$descendents) {
                    $new_tocheckfor{$_} = 1; $disabled{$_} = "cascade";
                }
            }
        }
        @tocheckfor = (keys %new_tocheckfor);
    }
}
disable();                     # First cascade run

our $die = sub { die @_; };
if ($target eq "TABLE") {
    local $die = sub { warn @_; };
    foreach (sort keys %table) {
        print_table_entry($_, "TABLE");
    }
    exit 0;
}

if ($target eq "LIST") {
    foreach (sort keys %table) {
        print $_,"\n" unless $table{$_}->{template};
    }
    exit 0;
}

if ($target eq "HASH") {
    local $die = sub { warn @_; };
    print "%table = (\n";
    foreach (sort keys %table) {
        print_table_entry($_, "HASH");
    }
    exit 0;
}

print "Configuring OpenSSL version $config{full_version} ";
print "for target $target\n";

if (scalar(@seed_sources) == 0) {
    print "Using os-specific seed configuration\n";
    push @seed_sources, 'os';
}
if (scalar(grep { $_ eq 'none' } @seed_sources) > 0) {
    die "Cannot seed with none and anything else" if scalar(@seed_sources) > 1;
    warn <<_____ if scalar(@seed_sources) == 1;

============================== WARNING ===============================
You have selected the --with-rand-seed=none option, which effectively
disables automatic reseeding of the OpenSSL random generator.
All operations depending on the random generator such as creating keys
will not work unless the random generator is seeded manually by the
application.

Please read the 'Note on random number generation' section in the
INSTALL.md instructions and the RAND_DRBG(7) manual page for more
details.
============================== WARNING ===============================

_____
}
push @{$config{openssl_feature_defines}},
     map { (my $x = $_) =~ tr|[\-a-z]|[_A-Z]|; "OPENSSL_RAND_SEED_$x" }
        @seed_sources;

# Backward compatibility?
if ($target =~ m/^CygWin32(-.*)$/) {
    $target = "Cygwin".$1;
}

# Support for legacy targets having a name starting with 'debug-'
my ($d, $t) = $target =~ m/^(debug-)?(.*)$/;
if ($d) {
    $config{build_type} = "debug";

    # If we do not find debug-foo in the table, the target is set to foo.
    if (!$table{$target}) {
        $target = $t;
    }
}

&usage if !$table{$target} || $table{$target}->{template};

$config{target} = $target;
my %target = resolve_config($target);

foreach (keys %target_attr_translate) {
    $target{$target_attr_translate{$_}} = $target{$_}
        if $target{$_};
    delete $target{$_};
}

%target = ( %{$table{DEFAULTS}}, %target );

my %conf_files = map { $_ => 1 } (@{$target{_conf_fname_int}});
$config{conf_files} = [ sort keys %conf_files ];

# Using sub disable within these loops may prove fragile, so we run
# a cascade afterwards
foreach my $feature (@{$target{disable}}) {
    if (exists $deprecated_disablables{$feature}) {
        warn "***** config $target disables deprecated feature $feature\n";
    } elsif (!grep { $feature eq $_ } @disablables) {
        die "***** config $target disables unknown feature $feature\n";
    }
    $disabled{$feature} = 'config';
}
foreach my $feature (@{$target{enable}}) {
    if ("default" eq ($disabled{$feature} // "")) {
        if (exists $deprecated_disablables{$feature}) {
            warn "***** config $target enables deprecated feature $feature\n";
        } elsif (!grep { $feature eq $_ } @disablables) {
            die "***** config $target enables unknown feature $feature\n";
        }
        delete $disabled{$feature};
    }
}

# If uplink_arch isn't defined, disable uplink
$disabled{uplink} = 'no uplink_arch' unless (defined $target{uplink_arch});
# If asm_arch isn't defined, disable asm
$disabled{asm} = 'no asm_arch' unless (defined $target{asm_arch});

disable();                      # Run a cascade now

$target{CXXFLAGS}//=$target{CFLAGS} if $target{CXX};
$target{cxxflags}//=$target{cflags} if $target{CXX};
$target{exe_extension}=".exe" if ($config{target} eq "DJGPP");
$target{exe_extension}=".pm"  if ($config{target} =~ /vos/);

# Fill %config with values from %user, and in case those are undefined or
# empty, use values from %target (acting as a default).
foreach (keys %user) {
    my $ref_type = ref $user{$_};

    # Temporary function.  Takes an intended ref type (empty string or "ARRAY")
    # and a value that's to be coerced into that type.
    my $mkvalue = sub {
        my $type = shift;
        my $value = shift;
        my $undef_p = shift;

        die "Too many arguments for \$mkvalue" if @_;

        while (ref $value eq 'CODE') {
            $value = $value->();
        }

        if ($type eq 'ARRAY') {
            return undef unless defined $value;
            return undef if ref $value ne 'ARRAY' && !$value;
            return undef if ref $value eq 'ARRAY' && !@$value;
            return [ $value ] unless ref $value eq 'ARRAY';
        }
        return undef unless $value;
        return $value;
    };

    $config{$_} =
        $mkvalue->($ref_type, $user{$_})
        || $mkvalue->($ref_type, $target{$_});
    delete $config{$_} unless defined $config{$_};
}

# Finish up %config by appending things the user gave us on the command line
# apart from "make variables"
foreach (keys %useradd) {
    # The must all be lists, so we assert that here
    die "internal error: \$useradd{$_} isn't an ARRAY\n"
        unless ref $useradd{$_} eq 'ARRAY';

    if (defined $config{$_}) {
        push @{$config{$_}}, @{$useradd{$_}};
    } else {
        $config{$_} = [ @{$useradd{$_}} ];
    }
}
# At this point, we can forget everything about %user and %useradd,
# because it's now all been merged into the corresponding $config entry

# Allow overriding the build file name
$config{build_file} = env('BUILDFILE') || $target{build_file} || "Makefile";

# Make sure build_scheme is consistent.
$target{build_scheme} = [ $target{build_scheme} ]
    if ref($target{build_scheme}) ne "ARRAY";

my ($builder, $builder_platform, @builder_opts) =
    @{$target{build_scheme}};

foreach my $checker (($builder_platform."-".$target{build_file}."-checker.pm",
                      $builder_platform."-checker.pm")) {
    my $checker_path = catfile($srcdir, "Configurations", $checker);
    if (-f $checker_path) {
        my $fn = $ENV{CONFIGURE_CHECKER_WARN}
            ? sub { warn $@; } : sub { die $@; };
        if (! do $checker_path) {
            if ($@) {
                $fn->($@);
            } elsif ($!) {
                $fn->($!);
            } else {
                $fn->("The detected tools didn't match the platform\n");
            }
        }
        last;
    }
}

push @{$config{defines}}, "NDEBUG"    if $config{build_type} eq "release";

if ($target =~ /^mingw/ && `$config{CC} --target-help 2>&1` =~ m/-mno-cygwin/m)
        {
        push @{$config{cflags}}, "-mno-cygwin";
        push @{$config{cxxflags}}, "-mno-cygwin" if $config{CXX};
        push @{$config{shared_ldflag}}, "-mno-cygwin";
        }

if ($target =~ /linux.*-mips/ && !$disabled{asm}
        && !grep { $_ !~ /-m(ips|arch=)/ } (@{$config{CFLAGS}})) {
        # minimally required architecture flags for assembly modules
        my $value;
        $value = '-mips2' if ($target =~ /mips32/);
        $value = '-mips3' if ($target =~ /mips64/);
        unshift @{$config{cflags}}, $value;
        unshift @{$config{cxxflags}}, $value if $config{CXX};
}

# If threads aren't disabled, check how possible they are
unless ($disabled{threads}) {
    if ($auto_threads) {
        # Enabled by default, disable it forcibly if unavailable
        if ($target{thread_scheme} eq "(unknown)") {
            disable("unavailable", 'threads');
        }
    } else {
        # The user chose to enable threads explicitly, let's see
        # if there's a chance that's possible
        if ($target{thread_scheme} eq "(unknown)") {
            # If the user asked for "threads" and we don't have internal
            # knowledge how to do it, [s]he is expected to provide any
            # system-dependent compiler options that are necessary.  We
            # can't truly check that the given options are correct, but
            # we expect the user to know what [s]He is doing.
            if (!@{$config{CFLAGS}} && !@{$config{CPPDEFINES}}) {
                die "You asked for multi-threading support, but didn't\n"
                    ,"provide any system-specific compiler options\n";
            }
        }
    }
}

# Find out if clang's sanitizers have been enabled with -fsanitize
# flags and ensure that the corresponding %disabled elements area
# removed to reflect that the sanitizers are indeed enabled.
my %detected_sanitizers = ();
foreach (grep /^-fsanitize=/, @{$config{CFLAGS} || []}) {
    (my $checks = $_) =~ s/^-fsanitize=//;
    foreach (split /,/, $checks) {
        my $d = { address       => 'asan',
                  undefined     => 'ubsan',
                  memory        => 'msan' } -> {$_};
        next unless defined $d;

        $detected_sanitizers{$d} = 1;
        if (defined $disabled{$d}) {
            die "***** Conflict between disabling $d and enabling $_ sanitizer"
                if $disabled{$d} ne "default";
            delete $disabled{$d};
        }
    }
}

# If threads still aren't disabled, add a C macro to ensure the source
# code knows about it.  Any other flag is taken care of by the configs.
unless($disabled{threads}) {
    push @{$config{openssl_feature_defines}}, "OPENSSL_THREADS";
}

my $no_shared_warn=0;
if ($target{shared_target} eq "")
        {
        $no_shared_warn = 1
            if (!$disabled{shared} || !$disabled{"dynamic-engine"});
        disable('no-shared-target', 'pic');
        }

if ($disabled{"dynamic-engine"}) {
        $config{dynamic_engines} = 0;
} else {
        $config{dynamic_engines} = 1;
}

unless ($disabled{asan} || defined $detected_sanitizers{asan}) {
    push @{$config{cflags}}, "-fsanitize=address";
}

unless ($disabled{ubsan} || defined $detected_sanitizers{ubsan}) {
    # -DPEDANTIC or -fnosanitize=alignment may also be required on some
    # platforms.
    push @{$config{cflags}}, "-fsanitize=undefined", "-fno-sanitize-recover=all";
}

unless ($disabled{msan} || defined $detected_sanitizers{msan}) {
  push @{$config{cflags}}, "-fsanitize=memory";
}

unless ($disabled{"fuzz-libfuzzer"} && $disabled{"fuzz-afl"}
        && $disabled{asan} && $disabled{ubsan} && $disabled{msan}) {
    push @{$config{cflags}}, "-fno-omit-frame-pointer", "-g";
    push @{$config{cxxflags}}, "-fno-omit-frame-pointer", "-g" if $config{CXX};
}
#
# Platform fix-ups
#

# This saves the build files from having to check
if ($disabled{pic})
        {
        foreach (qw(shared_cflag shared_cxxflag shared_cppflag
                    shared_defines shared_includes shared_ldflag
                    module_cflags module_cxxflags module_cppflags
                    module_defines module_includes module_lflags))
                {
                delete $config{$_};
                $target{$_} = "";
                }
        }
else
        {
        push @{$config{lib_defines}}, "OPENSSL_PIC";
        }

if ($target{sys_id} ne "")
        {
        push @{$config{openssl_sys_defines}}, "OPENSSL_SYS_$target{sys_id}";
        }

my %predefined_C = compiler_predefined($config{CROSS_COMPILE}.$config{CC});
my %predefined_CXX = $config{CXX}
    ? compiler_predefined($config{CROSS_COMPILE}.$config{CXX})
    : ();

unless ($disabled{asm}) {
    # big endian systems can use ELFv2 ABI
    if ($target eq "linux-ppc64") {
        $target{perlasm_scheme} = "linux64v2" if ($predefined_C{_CALL_ELF} == 2);
    }
}

# Check for makedepend capabilities.
if (!$disabled{makedepend}) {
    if ($config{target} =~ /^(VC|vms)-/) {
        # For VC- and vms- targets, there's nothing more to do here.  The
        # functionality is hard coded in the corresponding build files for
        # cl (Windows) and CC/DECC (VMS).
    } elsif (($predefined_C{__GNUC__} // -1) >= 3
             && !($predefined_C{__APPLE_CC__} && !$predefined_C{__clang__})) {
        # We know that GNU C version 3 and up as well as all clang
        # versions support dependency generation, but Xcode did not
        # handle $cc -M before clang support (but claims __GNUC__ = 3)
        $config{makedepprog} = "\$(CROSS_COMPILE)$config{CC}";
    } else {
        # In all other cases, we look for 'makedepend', and disable the
        # capability if not found.
        $config{makedepprog} = which('makedepend');
        disable('unavailable', 'makedepend') unless $config{makedepprog};
    }
}

if (!$disabled{asm} && !$predefined_C{__MACH__} && $^O ne 'VMS') {
    # probe for -Wa,--noexecstack option...
    if ($predefined_C{__clang__}) {
        # clang has builtin assembler, which doesn't recognize --help,
        # but it apparently recognizes the option in question on all
        # supported platforms even when it's meaningless. In other words
        # probe would fail, but probed option always accepted...
        push @{$config{cflags}}, "-Wa,--noexecstack", "-Qunused-arguments";
    } else {
        my $cc = $config{CROSS_COMPILE}.$config{CC};
        open(PIPE, "$cc -Wa,--help -c -o null.$$.o -x assembler /dev/null 2>&1 |");
        while(<PIPE>) {
            if (m/--noexecstack/) {
                push @{$config{cflags}}, "-Wa,--noexecstack";
                last;
            }
        }
        close(PIPE);
        unlink("null.$$.o");
    }
}

# Deal with bn_ops ###################################################

$config{bn_ll}                  =0;
my $def_int="unsigned int";
$config{rc4_int}                =$def_int;
($config{b64l},$config{b64},$config{b32})=(0,0,1);

my $count = 0;
foreach (sort split(/\s+/,$target{bn_ops})) {
    $count++ if /SIXTY_FOUR_BIT|SIXTY_FOUR_BIT_LONG|THIRTY_TWO_BIT/;
    $config{bn_ll}=1                            if $_ eq 'BN_LLONG';
    $config{rc4_int}="unsigned char"            if $_ eq 'RC4_CHAR';
    ($config{b64l},$config{b64},$config{b32})
        =(0,1,0)                                if $_ eq 'SIXTY_FOUR_BIT';
    ($config{b64l},$config{b64},$config{b32})
        =(1,0,0)                                if $_ eq 'SIXTY_FOUR_BIT_LONG';
    ($config{b64l},$config{b64},$config{b32})
        =(0,0,1)                                if $_ eq 'THIRTY_TWO_BIT';
}
die "Exactly one of SIXTY_FOUR_BIT|SIXTY_FOUR_BIT_LONG|THIRTY_TWO_BIT can be set in bn_ops\n"
    if $count > 1;

$config{api} = $config{major} * 10000 + $config{minor} * 100
    unless $config{api};
foreach (keys %$apitable) {
    $disabled{"deprecated-$_"} = "deprecation"
        if $disabled{deprecated} && $config{api} >= $apitable->{$_};
}

disable();                      # Run a cascade now

# Hack cflags for better warnings (dev option) #######################

# "Stringify" the C and C++ flags string.  This permits it to be made part of
# a string and works as well on command lines.
$config{cflags} = [ map { (my $x = $_) =~ s/([\\\"])/\\$1/g; $x }
                        @{$config{cflags}} ];
$config{cxxflags} = [ map { (my $x = $_) =~ s/([\\\"])/\\$1/g; $x }
                          @{$config{cxxflags}} ] if $config{CXX};

$config{openssl_api_defines} = [
    "OPENSSL_CONFIGURED_API=".$config{api},
];

my @strict_warnings_collection=();
if ($strict_warnings)
        {
        my $wopt;
        my $gccver = $predefined_C{__GNUC__} // -1;

        if ($gccver >= 4)
                {
                push @strict_warnings_collection, @gcc_devteam_warn;
                push @strict_warnings_collection, @clang_devteam_warn
                    if (defined($predefined_C{__clang__}));
                }
        elsif ($config{target} =~ /^VC-/)
                {
                push @strict_warnings_collection, @cl_devteam_warn;
                }
        else
                {
                warn "WARNING --strict-warnings requires gcc[>=4] or gcc-alike, or MSVC"
                }
        }

if (grep { $_ =~ /(?:^|\s)-static(?:\s|$)/ } @{$config{LDFLAGS}}) {
    disable('static', 'pic', 'threads');
}

$config{CFLAGS} = [ map { $_ eq '--ossl-strict-warnings'
                              ? @strict_warnings_collection
                              : ( $_ ) }
                    @{$config{CFLAGS}} ];

unless ($disabled{afalgeng}) {
    $config{afalgeng}="";
    if (grep { $_ eq 'afalgeng' } @{$target{enable}}) {
        my $minver = 4*10000 + 1*100 + 0;
        if ($config{CROSS_COMPILE} eq "") {
            my $verstr = `uname -r`;
            my ($ma, $mi1, $mi2) = split("\\.", $verstr);
            ($mi2) = $mi2 =~ /(\d+)/;
            my $ver = $ma*10000 + $mi1*100 + $mi2;
            if ($ver < $minver) {
                disable('too-old-kernel', 'afalgeng');
            } else {
                push @{$config{engdirs}}, "afalg";
            }
        } else {
            disable('cross-compiling', 'afalgeng');
        }
    } else {
        disable('not-linux', 'afalgeng');
    }
}

unless ($disabled{devcryptoeng}) {
    if ($target =~ m/^BSD/) {
        my $maxver = 5*100 + 7;
        my $sysstr = `uname -s`;
        my $verstr = `uname -r`;
        $sysstr =~ s|\R$||;
        $verstr =~ s|\R$||;
        my ($ma, $mi, @rest) = split m|\.|, $verstr;
        my $ver = $ma*100 + $mi;
        if ($sysstr eq 'OpenBSD' && $ver >= $maxver) {
            disable('too-new-kernel', 'devcryptoeng');
        }
    }
}

unless ($disabled{ktls}) {
    $config{ktls}="";
    if ($target =~ m/^linux/) {
        my $usr = "/usr/$config{cross_compile_prefix}";
        chop($usr);
        if ($config{cross_compile_prefix} eq "") {
            $usr = "/usr";
        }
        my $minver = (4 << 16) + (13 << 8) + 0;
        my @verstr = split(" ",`cat $usr/include/linux/version.h | grep LINUX_VERSION_CODE`);

        if ($verstr[2] < $minver) {
            disable('too-old-kernel', 'ktls');
        }
    } elsif ($target =~ m/^BSD/) {
        my $cc = $config{CROSS_COMPILE}.$config{CC};
        system("printf '#include <sys/types.h>\n#include <sys/ktls.h>' | $cc -E - >/dev/null 2>&1");
        if ($? != 0) {
            disable('too-old-freebsd', 'ktls');
        }
    } else {
        disable('not-linux-or-freebsd', 'ktls');
    }
}

push @{$config{openssl_other_defines}}, "OPENSSL_NO_KTLS" if ($disabled{ktls});

# Get the extra flags used when building shared libraries and modules.  We
# do this late because some of them depend on %disabled.

# Make the flags to build DSOs the same as for shared libraries unless they
# are already defined
$target{module_cflags} = $target{shared_cflag} unless defined $target{module_cflags};
$target{module_cxxflags} = $target{shared_cxxflag} unless defined $target{module_cxxflags};
$target{module_ldflags} = $target{shared_ldflag} unless defined $target{module_ldflags};
{
    my $shared_info_pl =
        catfile(dirname($0), "Configurations", "shared-info.pl");
    my %shared_info = read_eval_file($shared_info_pl);
    push @{$target{_conf_fname_int}}, $shared_info_pl;
    my $si = $target{shared_target};
    while (ref $si ne "HASH") {
        last if ! defined $si;
        if (ref $si eq "CODE") {
            $si = $si->();
        } else {
            $si = $shared_info{$si};
        }
    }

    # Some of the 'shared_target' values don't have any entries in
    # %shared_info.  That's perfectly fine, AS LONG AS the build file
    # template knows how to handle this.  That is currently the case for
    # Windows and VMS.
    if (defined $si) {
        # Just as above, copy certain shared_* attributes to the corresponding
        # module_ attribute unless the latter is already defined
        $si->{module_cflags} = $si->{shared_cflag} unless defined $si->{module_cflags};
        $si->{module_cxxflags} = $si->{shared_cxxflag} unless defined $si->{module_cxxflags};
        $si->{module_ldflags} = $si->{shared_ldflag} unless defined $si->{module_ldflags};
        foreach (sort keys %$si) {
            $target{$_} = defined $target{$_}
                ? add($si->{$_})->($target{$_})
                : $si->{$_};
        }
    }
}

# ALL MODIFICATIONS TO %disabled, %config and %target MUST BE DONE FROM HERE ON

######################################################################
# Build up information for skipping certain directories depending on disabled
# features, as well as setting up macros for disabled features.

# This is a tentative database of directories to skip.  Some entries may not
# correspond to anything real, but that's ok, they will simply be ignored.
# The actual processing of these entries is done in the build.info lookup
# loop further down.
#
# The key is a Unix formatted path in the source tree, the value is an index
# into %disabled_info, so any existing path gets added to a corresponding
# 'skipped' entry in there with the list of skipped directories.
my %skipdir = ();
my %disabled_info = ();         # For configdata.pm
foreach my $what (sort keys %disabled) {
    # There are deprecated disablables that translate to themselves.
    # They cause disabling cascades, but should otherwise not regiter.
    next if $deprecated_disablables{$what};
    # The generated $disabled{"deprecated-x.y"} entries are special
    # and treated properly elsewhere
    next if $what =~ m|^deprecated-|;

    $config{options} .= " no-$what";

    if (!grep { $what eq $_ } ( 'buildtest-c++', 'fips', 'threads', 'shared',
                                'module', 'pic', 'dynamic-engine', 'makedepend',
                                'zlib-dynamic', 'zlib', 'sse2', 'legacy' )) {
        (my $WHAT = uc $what) =~ s|-|_|g;
        my $skipdir = $what;

        # fix-up crypto/directory name(s)
        $skipdir = "ripemd" if $what eq "rmd160";
        $skipdir = "whrlpool" if $what eq "whirlpool";

        my $macro = $disabled_info{$what}->{macro} = "OPENSSL_NO_$WHAT";
        push @{$config{openssl_feature_defines}}, $macro;

        $skipdir{engines} = $what if $what eq 'engine';
        $skipdir{"crypto/$skipdir"} = $what
            unless $what eq 'async' || $what eq 'err' || $what eq 'dso';
    }
}

if ($disabled{"dynamic-engine"}) {
    push @{$config{openssl_feature_defines}}, "OPENSSL_NO_DYNAMIC_ENGINE";
} else {
    push @{$config{openssl_feature_defines}}, "OPENSSL_NO_STATIC_ENGINE";
}

# If we use the unified build, collect information from build.info files
my %unified_info = ();

my $buildinfo_debug = defined($ENV{CONFIGURE_DEBUG_BUILDINFO});
if ($builder eq "unified") {
    use Text::Template 1.46;

    sub cleandir {
        my $base = shift;
        my $dir = shift;
        my $relativeto = shift || ".";

        $dir = catdir($base,$dir) unless isabsolute($dir);

        # Make sure the directories we're building in exists
        mkpath($dir);

        my $res = abs2rel(absolutedir($dir), rel2abs($relativeto));
        #print STDERR "DEBUG[cleandir]: $dir , $base => $res\n";
        return $res;
    }

    sub cleanfile {
        my $base = shift;
        my $file = shift;
        my $relativeto = shift || ".";

        $file = catfile($base,$file) unless isabsolute($file);

        my $d = dirname($file);
        my $f = basename($file);

        # Make sure the directories we're building in exists
        mkpath($d);

        my $res = abs2rel(catfile(absolutedir($d), $f), rel2abs($relativeto));
        #print STDERR "DEBUG[cleanfile]: $d , $f => $res\n";
        return $res;
    }

    # Store the name of the template file we will build the build file from
    # in %config.  This may be useful for the build file itself.
    my @build_file_template_names =
        ( $builder_platform."-".$target{build_file}.".tmpl",
          $target{build_file}.".tmpl" );
    my @build_file_templates = ();

    # First, look in the user provided directory, if given
    if (defined env($local_config_envname)) {
        @build_file_templates =
            map {
                if ($^O eq 'VMS') {
                    # VMS environment variables are logical names,
                    # which can be used as is
                    $local_config_envname . ':' . $_;
                } else {
                    catfile(env($local_config_envname), $_);
                }
            }
            @build_file_template_names;
    }
    # Then, look in our standard directory
    push @build_file_templates,
        ( map { cleanfile($srcdir, catfile("Configurations", $_), $blddir) }
          @build_file_template_names );

    my $build_file_template;
    for $_ (@build_file_templates) {
        $build_file_template = $_;
        last if -f $build_file_template;

        $build_file_template = undef;
    }
    if (!defined $build_file_template) {
        die "*** Couldn't find any of:\n", join("\n", @build_file_templates), "\n";
    }
    $config{build_file_templates}
      = [ cleanfile($srcdir, catfile("Configurations", "common0.tmpl"),
                    $blddir),
          $build_file_template,
          cleanfile($srcdir, catfile("Configurations", "common.tmpl"),
                    $blddir) ];

    my @build_dirs = ( [ ] );   # current directory

    $config{build_infos} = [ ];

    my %ordinals = ();
    while (@build_dirs) {
        my @curd = @{shift @build_dirs};
        my $sourced = catdir($srcdir, @curd);
        my $buildd = catdir($blddir, @curd);

        my $unixdir = join('/', @curd);
        if (exists $skipdir{$unixdir}) {
            my $what = $skipdir{$unixdir};
            push @{$disabled_info{$what}->{skipped}}, catdir(@curd);
            next;
        }

        mkpath($buildd);

        my $f = 'build.info';
        # The basic things we're trying to build
        my @programs = ();
        my @libraries = ();
        my @modules = ();
        my @scripts = ();

        my %sources = ();
        my %shared_sources = ();
        my %includes = ();
        my %defines = ();
        my %depends = ();
        my %generate = ();
        my %htmldocs = ();
        my %mandocs = ();

        # Support for $variablename in build.info files.
        # Embedded perl code is the ultimate master, still.  If its output
        # contains a dollar sign, it had better be escaped, or it will be
        # taken for a variable name prefix.
        my %variables = ();
        # Variable name syntax
        my $variable_name_re = qr/(?P<VARIABLE>[[:alpha:]][[:alnum:]_]*)/;
        # Value modifier syntaxes
        my $variable_subst_re = qr/\/(?P<RE>(?:\\\/|.)*?)\/(?P<SUBST>.*?)/;
        # Variable reference
        my $variable_simple_re = qr/(?<!\\)\$${variable_name_re}/;
        my $variable_w_mod_re =
            qr/(?<!\\)\$\{${variable_name_re}(?P<MOD>(?:\\\/|.)*?)\}/;
        # Tie it all together
        my $variable_re = qr/${variable_simple_re}|${variable_w_mod_re}/;

        my $expand_variables = sub {
            my $value = '';
            my $value_rest = shift;

            if ($ENV{CONFIGURE_DEBUG_VARIABLE_EXPAND}) {
                print STDERR
                    "DEBUG[\$expand_variables] Parsed '$value_rest' ...\n"
            }

            while ($value_rest =~ /${variable_re}/) {
                # We must save important regexp values, because the next
                # regexp clears them
                my $mod = $+{MOD};
                my $variable_value = $variables{$+{VARIABLE}};

                $value_rest = $';
                $value .= $`;

                # Process modifier expressions, if present
                if (defined $mod) {
                    if ($mod =~ /^${variable_subst_re}$/) {
                        my $re = $+{RE};
                        my $subst = $+{SUBST};

                        $variable_value =~ s/\Q$re\E/$subst/g;

                        if ($ENV{CONFIGURE_DEBUG_VARIABLE_EXPAND}) {
                            print STDERR
                                "DEBUG[\$expand_variables] ... and substituted ",
                                "'$re' with '$subst'\n";
                        }
                    }
                }

                $value .= $variable_value;
            }
            if ($ENV{CONFIGURE_DEBUG_VARIABLE_EXPAND}) {
                print STDERR
                    "DEBUG[\$expand_variables] ... into: '$value$value_rest'\n";
            }
            return $value . $value_rest;
        };

        # Support for attributes in build.info files
        my %attributes = ();
        my $handle_attributes = sub {
            my $attr_str = shift;
            my $ref = shift;
            my @goals = @_;

            return unless defined $attr_str;

            my @a = tokenize($attr_str, qr|\s*,\s*|);
            foreach my $a (@a) {
                my $ac = 1;
                my $ak = $a;
                my $av = 1;
                if ($a =~ m|^(!)?(.*?)\s* = \s*(.*?)$|) {
                    $ac = ! $1;
                    $ak = $1;
                    $av = $2;
                }
                foreach my $g (@goals) {
                    if ($ac) {
                        $$ref->{$g}->{$ak} = $av;
                    } else {
                        delete $$ref->{$g}->{$ak};
                    }
                }
            }
        };

        # Support for pushing values on multiple indexes of a given hash
        # array.
        my $push_to = sub {
            my $valueref = shift;
            my $index_str = shift; # May be undef or empty
            my $attrref = shift;   # May be undef
            my $attr_str = shift;
            my @values = @_;

            if (defined $index_str) {
                my @indexes = ( '' );
                if ($index_str !~ m|^\s*$|) {
                    @indexes = tokenize($index_str);
                }
                foreach (@indexes) {
                    push @{$valueref->{$_}}, @values;
                    if (defined $attrref) {
                        $handle_attributes->($attr_str, \$$attrref->{$_},
                                             @values);
                    }
                }
            } else {
                push @$valueref, @values;
                $handle_attributes->($attr_str, $attrref, @values)
                    if defined $attrref;
            }
        };

        # We want to detect configdata.pm in the source tree, so we
        # don't use it if the build tree is different.
        my $src_configdata = cleanfile($srcdir, "configdata.pm", $blddir);


        if ($buildinfo_debug) {
            print STDERR "DEBUG: Reading ",catfile($sourced, $f),"\n";
        }
        push @{$config{build_infos}}, catfile(abs2rel($sourced, $blddir), $f);
        my $template =
            Text::Template->new(TYPE => 'FILE',
                                SOURCE => catfile($sourced, $f),
                                PREPEND => qq{use lib "$FindBin::Bin/util/perl";});
        die "Something went wrong with $sourced/$f: $!\n" unless $template;
        my @text =
            split /^/m,
            $template->fill_in(HASH => { config => \%config,
                                         target => \%target,
                                         disabled => \%disabled,
                                         withargs => \%withargs,
                                         builddir => abs2rel($buildd, $blddir),
                                         sourcedir => abs2rel($sourced, $blddir),
                                         buildtop => abs2rel($blddir, $blddir),
                                         sourcetop => abs2rel($srcdir, $blddir) },
                               DELIMITERS => [ "{-", "-}" ]);

        # The top item of this stack has the following values
        # -2 positive already run and we found ELSE (following ELSIF should fail)
        # -1 positive already run (skip until ENDIF)
        # 0 negatives so far (if we're at a condition, check it)
        # 1 last was positive (don't skip lines until next ELSE, ELSIF or ENDIF)
        # 2 positive ELSE (following ELSIF should fail)
        my @skip = ();

        # A few useful generic regexps
        my $index_re = qr/\[\s*(?P<INDEX>(?:\\.|.)*?)\s*\]/;
        my $cond_re = qr/\[\s*(?P<COND>(?:\\.|.)*?)\s*\]/;
        my $attribs_re = qr/(?:\{\s*(?P<ATTRIBS>(?:\\.|.)*?)\s*\})?/;
        my $value_re = qr/\s*(?P<VALUE>.*?)\s*/;
        collect_information(
            collect_from_array([ @text ],
                               qr/\\$/ => sub { my $l1 = shift; my $l2 = shift;
                                                $l1 =~ s/\\$//; $l1.$l2 }),
            # Info we're looking for
            qr/^\s* IF ${cond_re} \s*$/x
            => sub {
                if (! @skip || $skip[$#skip] > 0) {
                    push @skip, !! $expand_variables->($+{COND});
                } else {
                    push @skip, -1;
                }
            },
            qr/^\s* ELSIF ${cond_re} \s*$/x
            => sub { die "ELSIF out of scope" if ! @skip;
                     die "ELSIF following ELSE" if abs($skip[$#skip]) == 2;
                     $skip[$#skip] = -1 if $skip[$#skip] != 0;
                     $skip[$#skip] = !! $expand_variables->($+{COND})
                         if $skip[$#skip] == 0; },
            qr/^\s* ELSE \s*$/x
            => sub { die "ELSE out of scope" if ! @skip;
                     $skip[$#skip] = -2 if $skip[$#skip] != 0;
                     $skip[$#skip] = 2 if $skip[$#skip] == 0; },
            qr/^\s* ENDIF \s*$/x
            => sub { die "ENDIF out of scope" if ! @skip;
                     pop @skip; },
            qr/^\s* ${variable_re} \s* = ${value_re} $/x
            => sub {
                if (!@skip || $skip[$#skip] > 0) {
                    $variables{$+{VARIABLE}} = $expand_variables->($+{VALUE});
                }
            },
            qr/^\s* SUBDIRS \s* = ${value_re} $/x
            => sub {
                if (!@skip || $skip[$#skip] > 0) {
                    foreach (tokenize($expand_variables->($+{VALUE}))) {
                        push @build_dirs, [ @curd, splitdir($_, 1) ];
                    }
                }
            },
            qr/^\s* PROGRAMS ${attribs_re} \s* =  ${value_re} $/x
            => sub { $push_to->(\@programs, undef,
                                \$attributes{programs}, $+{ATTRIBS},
                                tokenize($expand_variables->($+{VALUE})))
                         if !@skip || $skip[$#skip] > 0; },
            qr/^\s* LIBS ${attribs_re} \s* =  ${value_re} $/x
            => sub { $push_to->(\@libraries, undef,
                                \$attributes{libraries}, $+{ATTRIBS},
                                tokenize($expand_variables->($+{VALUE})))
                         if !@skip || $skip[$#skip] > 0; },
            qr/^\s* MODULES ${attribs_re} \s* =  ${value_re} $/x
            => sub { $push_to->(\@modules, undef,
                                \$attributes{modules}, $+{ATTRIBS},
                                tokenize($expand_variables->($+{VALUE})))
                         if !@skip || $skip[$#skip] > 0; },
            qr/^\s* SCRIPTS ${attribs_re} \s* =  ${value_re} $/x
            => sub { $push_to->(\@scripts, undef,
                                \$attributes{scripts}, $+{ATTRIBS},
                                tokenize($expand_variables->($+{VALUE})))
                         if !@skip || $skip[$#skip] > 0; },
            qr/^\s* HTMLDOCS ${index_re} = ${value_re} $/x
            => sub { $push_to->(\%htmldocs, $expand_variables->($+{INDEX}),
                                undef, undef,
                                tokenize($expand_variables->($+{VALUE})))
                         if !@skip || $skip[$#skip] > 0; },
            qr/^\s* MANDOCS ${index_re} = ${value_re} $/x
            => sub { $push_to->(\%mandocs, $expand_variables->($+{INDEX}),
                                undef, undef,
                                tokenize($expand_variables->($+{VALUE})))
                         if !@skip || $skip[$#skip] > 0; },
            qr/^\s* SOURCE ${index_re} = ${value_re} $/x
            => sub { $push_to->(\%sources, $expand_variables->($+{INDEX}),
                                undef, undef,
                                tokenize($expand_variables->($+{VALUE})))
                         if !@skip || $skip[$#skip] > 0; },
            qr/^\s* SHARED_SOURCE ${index_re} = ${value_re} $/x
            => sub { $push_to->(\%shared_sources, $expand_variables->($+{INDEX}),
                                undef, undef,
                                tokenize($expand_variables->($+{VALUE})))
                         if !@skip || $skip[$#skip] > 0; },
            qr/^\s* INCLUDE ${index_re} = ${value_re} $/x
            => sub { $push_to->(\%includes, $expand_variables->($+{INDEX}),
                                undef, undef,
                                tokenize($expand_variables->($+{VALUE})))
                         if !@skip || $skip[$#skip] > 0; },
            qr/^\s* DEFINE ${index_re} = ${value_re} $/x
            => sub { $push_to->(\%defines, $expand_variables->($+{INDEX}),
                                undef, undef,
                                tokenize($expand_variables->($+{VALUE})))
                         if !@skip || $skip[$#skip] > 0; },
            qr/^\s* DEPEND ${index_re} ${attribs_re} = ${value_re} $/x
            => sub { $push_to->(\%depends, $expand_variables->($+{INDEX}),
                                \$attributes{depends}, $+{ATTRIBS},
                                tokenize($expand_variables->($+{VALUE})))
                         if !@skip || $skip[$#skip] > 0; },
            qr/^\s* GENERATE ${index_re} = ${value_re} $/x
            => sub { $push_to->(\%generate, $expand_variables->($+{INDEX}),
                                undef, undef, $+{VALUE})
                         if !@skip || $skip[$#skip] > 0; },
            qr/^\s* (?:\#.*)? $/x => sub { },
            "OTHERWISE" => sub { die "Something wrong with this line:\n$_\nat $sourced/$f" },
            "BEFORE" => sub {
                if ($buildinfo_debug) {
                    print STDERR "DEBUG: Parsing ",join(" ", @_),"\n";
                    print STDERR "DEBUG: ... before parsing, skip stack is ",join(" ", map { int($_) } @skip),"\n";
                }
            },
            "AFTER" => sub {
                if ($buildinfo_debug) {
                    print STDERR "DEBUG: .... after parsing, skip stack is ",join(" ", map { int($_) } @skip),"\n";
                }
            },
            );
        die "runaway IF?" if (@skip);

        if (grep { defined $attributes{modules}->{$_}->{engine} } keys %attributes
                and !$config{dynamic_engines}) {
            die <<"EOF"
ENGINES can only be used if configured with 'dynamic-engine'.
This is usually a fault in a build.info file.
EOF
        }

        {
            my %infos = ( programs  => [ @programs  ],
                          libraries => [ @libraries ],
                          modules   => [ @modules   ],
                          scripts   => [ @scripts   ] );
            foreach my $k (keys %infos) {
                foreach (@{$infos{$k}}) {
                    my $item = cleanfile($buildd, $_, $blddir);
                    $unified_info{$k}->{$item} = 1;

                    # Fix up associated attributes
                    $unified_info{attributes}->{$k}->{$item} =
                        $attributes{$k}->{$_}
                        if defined $attributes{$k}->{$_};
                }
            }
        }

        # Check that we haven't defined any library as both shared and
        # explicitly static.  That is forbidden.
        my @doubles = ();
        foreach (grep /\.a$/, keys %{$unified_info{libraries}}) {
            (my $l = $_) =~ s/\.a$//;
            push @doubles, $l if defined $unified_info{libraries}->{$l};
        }
        die "these libraries are both explicitly static and shared:\n  ",
            join(" ", @doubles), "\n"
            if @doubles;

        foreach (keys %sources) {
            my $dest = $_;
            my $ddest = cleanfile($buildd, $_, $blddir);
            foreach (@{$sources{$dest}}) {
                my $s = cleanfile($sourced, $_, $blddir);

                # If it's generated or we simply don't find it in the source
                # tree, we assume it's in the build tree.
                if ($s eq $src_configdata || $generate{$_} || ! -f $s) {
                    $s = cleanfile($buildd, $_, $blddir);
                }
                # We recognise C++, C and asm files
                if ($s =~ /\.(cc|cpp|c|s|S)$/) {
                    my $o = $_;
                    $o =~ s/\.[csS]$/.o/; # C and assembler
                    $o =~ s/\.(cc|cpp)$/_cc.o/; # C++
                    $o = cleanfile($buildd, $o, $blddir);
                    $unified_info{sources}->{$ddest}->{$o} = -1;
                    $unified_info{sources}->{$o}->{$s} = -1;
                } elsif ($s =~ /\.rc$/) {
                    # We also recognise resource files
                    my $o = $_;
                    $o =~ s/\.rc$/.res/; # Resource configuration
                    my $o = cleanfile($buildd, $o, $blddir);
                    $unified_info{sources}->{$ddest}->{$o} = -1;
                    $unified_info{sources}->{$o}->{$s} = -1;
                } else {
                    $unified_info{sources}->{$ddest}->{$s} = 1;
                }
            }
        }

        foreach (keys %shared_sources) {
            my $dest = $_;
            my $ddest = cleanfile($buildd, $_, $blddir);
            foreach (@{$shared_sources{$dest}}) {
                my $s = cleanfile($sourced, $_, $blddir);

                # If it's generated or we simply don't find it in the source
                # tree, we assume it's in the build tree.
                if ($s eq $src_configdata || $generate{$_} || ! -f $s) {
                    $s = cleanfile($buildd, $_, $blddir);
                }

                if ($s =~ /\.(cc|cpp|c|s|S)$/) {
                    # We recognise C++, C and asm files
                    my $o = $_;
                    $o =~ s/\.[csS]$/.o/; # C and assembler
                    $o =~ s/\.(cc|cpp)$/_cc.o/; # C++
                    $o = cleanfile($buildd, $o, $blddir);
                    $unified_info{shared_sources}->{$ddest}->{$o} = -1;
                    $unified_info{sources}->{$o}->{$s} = -1;
                } elsif ($s =~ /\.rc$/) {
                    # We also recognise resource files
                    my $o = $_;
                    $o =~ s/\.rc$/.res/; # Resource configuration
                    my $o = cleanfile($buildd, $o, $blddir);
                    $unified_info{shared_sources}->{$ddest}->{$o} = -1;
                    $unified_info{sources}->{$o}->{$s} = -1;
                } elsif ($s =~ /\.ld$/) {
                    # We also recognise linker scripts (or corresponding)
                    # We know they are generated files
                    my $ld = cleanfile($buildd, $_, $blddir);
                    $unified_info{shared_sources}->{$ddest}->{$ld} = 1;
                } else {
                    die "unrecognised source file type for shared library: $s\n";
                }
            }
        }

        foreach (keys %generate) {
            my $dest = $_;
            my $ddest = cleanfile($buildd, $_, $blddir);
            die "more than one generator for $dest: "
                ,join(" ", @{$generate{$_}}),"\n"
                if scalar @{$generate{$_}} > 1;
            my @generator = split /\s+/, $generate{$dest}->[0];
            my $gen = $generator[0];
            $generator[0] = cleanfile($sourced, $gen, $blddir);

            # If the generator is itself generated, it's in the build tree
            if ($generate{$gen}) {
                $generator[0] = cleanfile($buildd, $gen, $blddir);
            }

            $unified_info{generate}->{$ddest} = [ @generator ];
        }

        foreach (keys %depends) {
            my $dest = $_;
            my $ddest = $dest eq "" ? "" : cleanfile($sourced, $_, $blddir);

            # If the destination doesn't exist in source, it can only be
            # a generated file in the build tree.
            if ($ddest ne "" && ($ddest eq $src_configdata || ! -f $ddest)) {
                $ddest = cleanfile($buildd, $_, $blddir);
            }
            foreach (@{$depends{$dest}}) {
                my $d = cleanfile($sourced, $_, $blddir);

                # If we know it's generated, or assume it is because we can't
                # find it in the source tree, we set file we depend on to be
                # in the build tree rather than the source tree.
                if ($d eq $src_configdata
                    || (grep { $d eq $_ }
                        map { cleanfile($srcdir, $_, $blddir) }
                        grep { /\.h$/ } keys %{$unified_info{generate}})
                    || ! -f $d) {
                    $d = cleanfile($buildd, $_, $blddir);
                }
                $unified_info{depends}->{$ddest}->{$d} = 1;

                # Fix up associated attributes
                $unified_info{attributes}->{depends}->{$ddest}->{$d} =
                    $attributes{depends}->{$dest}->{$_}
                    if defined $attributes{depends}->{$dest}->{$_};
            }
        }

        foreach (keys %includes) {
            my $dest = $_;
            my $ddest = cleanfile($sourced, $_, $blddir);

            # If the destination doesn't exist in source, it can only be
            # a generated file in the build tree.
            if ($ddest eq $src_configdata || ! -f $ddest) {
                $ddest = cleanfile($buildd, $_, $blddir);
            }
            foreach (@{$includes{$dest}}) {
                my $is = cleandir($sourced, $_, $blddir);
                my $ib = cleandir($buildd, $_, $blddir);
                push @{$unified_info{includes}->{$ddest}->{source}}, $is
                    unless grep { $_ eq $is } @{$unified_info{includes}->{$ddest}->{source}};
                push @{$unified_info{includes}->{$ddest}->{build}}, $ib
                    unless grep { $_ eq $ib } @{$unified_info{includes}->{$ddest}->{build}};
            }
        }

        foreach my $dest (keys %defines) {
            my $ddest;

            if ($dest ne "") {
                $ddest = cleanfile($sourced, $dest, $blddir);

                # If the destination doesn't exist in source, it can only
                # be a generated file in the build tree.
                if (! -f $ddest) {
                    $ddest = cleanfile($buildd, $dest, $blddir);
                }
            }
            foreach my $v (@{$defines{$dest}}) {
                $v =~ m|^([^=]*)(=.*)?$|;
                die "0 length macro name not permitted\n" if $1 eq "";
                if ($dest ne "") {
                    die "$1 defined more than once\n"
                        if defined $unified_info{defines}->{$ddest}->{$1};
                    $unified_info{defines}->{$ddest}->{$1} = $2;
                } else {
                    die "$1 defined more than once\n"
                        if grep { $v eq $_ } @{$config{defines}};
                    push @{$config{defines}}, $v;
                }
            }
        }

        foreach my $section (keys %htmldocs) {
            foreach (@{$htmldocs{$section}}) {
                my $htmldocs = cleanfile($buildd, $_, $blddir);
                $unified_info{htmldocs}->{$section}->{$htmldocs} = 1;
            }
        }

        foreach my $section (keys %mandocs) {
            foreach (@{$mandocs{$section}}) {
                my $mandocs = cleanfile($buildd, $_, $blddir);
                $unified_info{mandocs}->{$section}->{$mandocs} = 1;
            }
        }
    }

    my $ordinals_text = join(', ', sort keys %ordinals);
    warn <<"EOF" if $ordinals_text;

WARNING: ORDINALS were specified for $ordinals_text
They are ignored and should be replaced with a combination of GENERATE,
DEPEND and SHARED_SOURCE.
EOF


    # Go through the sources of all libraries and check that the same basename
    # doesn't appear more than once.  Some static library archivers depend on
    # them being unique.
    {
        my $err = 0;
        foreach my $prod (keys %{$unified_info{libraries}}) {
            my @prod_sources =
                map { keys %{$unified_info{sources}->{$_}} }
                keys %{$unified_info{sources}->{$prod}};
            my %srccnt = ();

            # Count how many times a given each source basename
            # appears for each product.
            foreach my $src (@prod_sources) {
                $srccnt{basename $src}++;
            }

            foreach my $src (keys %srccnt) {
                if ((my $cnt = $srccnt{$src}) > 1) {
                    print STDERR "$src appears $cnt times for the product $prod\n";
                    $err++
                }
            }
        }
        die if $err > 0;
    }

    # Massage the result

    # If we depend on a header file or a perl module, add an inclusion of
    # its directory to allow smoothe inclusion
    foreach my $dest (keys %{$unified_info{depends}}) {
        next if $dest eq "";
        foreach my $d (keys %{$unified_info{depends}->{$dest}}) {
            next unless $d =~ /\.(h|pm)$/;
            my $i = dirname($d);
            my $spot =
                $d eq "configdata.pm" || defined($unified_info{generate}->{$d})
                ? 'build' : 'source';
            push @{$unified_info{includes}->{$dest}->{$spot}}, $i
                unless grep { $_ eq $i } @{$unified_info{includes}->{$dest}->{$spot}};
        }
    }

    # Go through all intermediary files and change their names to something that
    # reflects what they will be built for.  Note that for some source files,
    # this leads to duplicate object files because they are used multiple times.
    # the goal is to rename all object files according to this scheme:
    #    {productname}-{midfix}-{origobjname}.[o|res]
    # the {midfix} is a keyword indicating the type of product, which is mostly
    # valuable for libraries since they come in two forms.
    #
    # This also reorganises the {sources} and {shared_sources} so that the
    # former only contains ALL object files that are supposed to end up in
    # static libraries and programs, while the latter contains ALL object files
    # that are supposed to end up in shared libraries and DSOs.
    # The main reason for having two different source structures is to allow
    # the same name to be used for the static and the shared variants of a
    # library.
    {
        # Take copies so we don't get interference from added stuff
        my %unified_copy = ();
        foreach (('sources', 'shared_sources')) {
            $unified_copy{$_} = { %{$unified_info{$_}} }
                if defined($unified_info{$_});
            delete $unified_info{$_};
        }
        foreach my $prodtype (('programs', 'libraries', 'modules', 'scripts')) {
            # $intent serves multi purposes:
            # - give a prefix for the new object files names
            # - in the case of libraries, rearrange the object files so static
            #   libraries use the 'sources' structure exclusively, while shared
            #   libraries use the 'shared_sources' structure exclusively.
            my $intent = {
                programs  => { bin    => { src => [ 'sources' ],
                                           dst => 'sources' } },
                libraries => { lib    => { src => [ 'sources' ],
                                           dst => 'sources' },
                               shlib  => { prodselect =>
                                               sub { grep !/\.a$/, @_ },
                                           src => [ 'sources',
                                                    'shared_sources' ],
                                           dst => 'shared_sources' } },
                modules   => { dso    => { src => [ 'sources' ],
                                           dst => 'sources' } },
                scripts   => { script => { src => [ 'sources' ],
                                           dst => 'sources' } }
               } -> {$prodtype};
            foreach my $kind (keys %$intent) {
                next if ($intent->{$kind}->{dst} eq 'shared_sources'
                             && $disabled{shared});

                my @src = @{$intent->{$kind}->{src}};
                my $dst = $intent->{$kind}->{dst};
                my $prodselect = $intent->{$kind}->{prodselect} // sub { @_ };
                foreach my $prod ($prodselect->(keys %{$unified_info{$prodtype}})) {
                    # %prod_sources has all applicable objects as keys, and
                    # their corresponding sources as values
                    my %prod_sources =
                        map { $_ => [ keys %{$unified_copy{sources}->{$_}} ] }
                        map { keys %{$unified_copy{$_}->{$prod}} }
                        @src;
                    foreach (keys %prod_sources) {
                        # Only affect object files and resource files,
                        # the others simply get a new value
                        # (+1 instead of -1)
                        if ($_ =~ /\.(o|res)$/) {
                            (my $prodname = $prod) =~ s|\.a$||;
                            my $newobj =
                                catfile(dirname($_),
                                        basename($prodname)
                                            . '-' . $kind
                                            . '-' . basename($_));
                            $unified_info{$dst}->{$prod}->{$newobj} = 1;
                            foreach my $src (@{$prod_sources{$_}}) {
                                $unified_info{sources}->{$newobj}->{$src} = 1;
                            }
                            # Adjust dependencies
                            foreach my $deps (keys %{$unified_info{depends}->{$_}}) {
                                $unified_info{depends}->{$_}->{$deps} = -1;
                                $unified_info{depends}->{$newobj}->{$deps} = 1;
                            }
                            # Adjust includes
                            foreach my $k (('source', 'build')) {
                                next unless
                                    defined($unified_info{includes}->{$_}->{$k});
                                my @incs = @{$unified_info{includes}->{$_}->{$k}};
                                $unified_info{includes}->{$newobj}->{$k} = [ @incs ];
                            }
                        } else {
                            $unified_info{$dst}->{$prod}->{$_} = 1;
                        }
                    }
                }
            }
        }
    }

    # At this point, we have a number of sources with the value -1.  They
    # aren't part of the local build and are probably meant for a different
    # platform, and can therefore be cleaned away.  That happens when making
    # %unified_info more efficient below.

    ### Make unified_info a bit more efficient
    # One level structures
    foreach (("programs", "libraries", "modules", "scripts")) {
        $unified_info{$_} = [ sort keys %{$unified_info{$_}} ];
    }
    # Two level structures
    foreach my $l1 (("sources", "shared_sources", "ldadd", "depends",
                     "htmldocs", "mandocs")) {
        foreach my $l2 (sort keys %{$unified_info{$l1}}) {
            my @items =
                sort
                grep { $unified_info{$l1}->{$l2}->{$_} > 0 }
                keys %{$unified_info{$l1}->{$l2}};
            if (@items) {
                $unified_info{$l1}->{$l2} = [ @items ];
            } else {
                delete $unified_info{$l1}->{$l2};
            }
        }
    }
    # Defines
    foreach my $dest (sort keys %{$unified_info{defines}}) {
        $unified_info{defines}->{$dest}
            = [ map { $_.$unified_info{defines}->{$dest}->{$_} }
                sort keys %{$unified_info{defines}->{$dest}} ];
    }
    # Includes
    foreach my $dest (sort keys %{$unified_info{includes}}) {
        if (defined($unified_info{includes}->{$dest}->{build})) {
            my @source_includes = ();
            @source_includes = ( @{$unified_info{includes}->{$dest}->{source}} )
                if defined($unified_info{includes}->{$dest}->{source});
            $unified_info{includes}->{$dest} =
                [ @{$unified_info{includes}->{$dest}->{build}} ];
            foreach my $inc (@source_includes) {
                push @{$unified_info{includes}->{$dest}}, $inc
                    unless grep { $_ eq $inc } @{$unified_info{includes}->{$dest}};
            }
        } elsif (defined($unified_info{includes}->{$dest}->{source})) {
            $unified_info{includes}->{$dest} =
                [ @{$unified_info{includes}->{$dest}->{source}} ];
        } else {
            delete $unified_info{includes}->{$dest};
        }
    }

    # For convenience collect information regarding directories where
    # files are generated, those generated files and the end product
    # they end up in where applicable.  Then, add build rules for those
    # directories
    my %loopinfo = ( "lib" => [ @{$unified_info{libraries}} ],
                     "dso" => [ @{$unified_info{modules}} ],
                     "bin" => [ @{$unified_info{programs}} ],
                     "script" => [ @{$unified_info{scripts}} ],
                     "docs" => [ (map { @{$unified_info{htmldocs}->{$_} // []} }
                                  keys %{$unified_info{htmldocs} // {}}),
                                 (map { @{$unified_info{mandocs}->{$_} // []} }
                                  keys %{$unified_info{mandocs} // {}}) ] );
    foreach my $type (keys %loopinfo) {
        foreach my $product (@{$loopinfo{$type}}) {
            my %dirs = ();
            my $pd = dirname($product);

            foreach (@{$unified_info{sources}->{$product} // []},
                     @{$unified_info{shared_sources}->{$product} // []}) {
                my $d = dirname($_);

                # We don't want to create targets for source directories
                # when building out of source
                next if ($config{sourcedir} ne $config{builddir}
                             && $d =~ m|^\Q$config{sourcedir}\E|);
                # We already have a "test" target, and the current directory
                # is just silly to make a target for
                next if $d eq "test" || $d eq ".";

                $dirs{$d} = 1;
                push @{$unified_info{dirinfo}->{$d}->{deps}}, $_
                    if $d ne $pd;
            }
            foreach (keys %dirs) {
                push @{$unified_info{dirinfo}->{$_}->{products}->{$type}},
                    $product;
            }
        }
    }
}

# For the schemes that need it, we provide the old *_obj configs
# from the *_asm_obj ones
foreach (grep /_(asm|aux)_src$/, keys %target) {
    my $src = $_;
    (my $obj = $_) =~ s/_(asm|aux)_src$/_obj/;
    $target{$obj} = $target{$src};
    $target{$obj} =~ s/\.[csS]\b/.o/g; # C and assembler
    $target{$obj} =~ s/\.(cc|cpp)\b/_cc.o/g; # C++
}

# Write down our configuration where it fits #########################

my %template_vars = (
    config => \%config,
    target => \%target,
    disablables => \@disablables,
    disablables_int => \@disablables_int,
    disabled => \%disabled,
    withargs => \%withargs,
    unified_info => \%unified_info,
    tls => \@tls,
    dtls => \@dtls,
    makevars => [ sort keys %user ],
    disabled_info => \%disabled_info,
    user_crossable => \@user_crossable,
);
my $configdata_outname = 'configdata.pm';
print "Creating $configdata_outname\n";
open CONFIGDATA, ">$configdata_outname.new"
            or die "Trying to create $configdata_outname.new: $!";
my $configdata_tmplname = cleanfile($srcdir, "configdata.pm.in", $blddir);
my $configdata_tmpl =
    OpenSSL::Template->new(TYPE => 'FILE', SOURCE => $configdata_tmplname);
$configdata_tmpl->fill_in(
    FILENAME => $configdata_tmplname,
    OUTPUT => \*CONFIGDATA,
    HASH => { %template_vars,
              autowarntext => [
                  'WARNING: do not edit!',
                  "Generated by Configure from $configdata_tmplname",
              ] }
) or die $Text::Template::ERROR;
close CONFIGDATA;
rename "$configdata_outname.new", $configdata_outname;
if ($builder_platform eq 'unix') {
    my $mode = (0755 & ~umask);
    chmod $mode, 'configdata.pm'
        or warn sprintf("WARNING: Couldn't change mode for 'configdata.pm' to 0%03o: %s\n",$mode,$!);
}

print "Running $configdata_outname\n";
my $perlcmd = (quotify("maybeshell", $config{PERL}))[0];
my $cmd = "$perlcmd $configdata_outname";
#print STDERR "DEBUG[run_dofile]: \$cmd = $cmd\n";
system($cmd);
exit 1 if $? != 0;

$SIG{__DIE__} = $orig_death_handler;

print <<"EOF" if ($disabled{threads} eq "unavailable");

The library could not be configured for supporting multi-threaded
applications as the compiler options required on this system are not known.
See file INSTALL.md for details if you need multi-threading.
EOF

print <<"EOF" if ($no_shared_warn);

The options 'shared', 'pic' and 'dynamic-engine' aren't supported on this
platform, so we will pretend you gave the option 'no-pic', which also disables
'shared' and 'dynamic-engine'.  If you know how to implement shared libraries
or position independent code, please let us know (but please first make sure
you have tried with a current version of OpenSSL).
EOF

print <<"EOF";

**********************************************************************
***                                                                ***
***   OpenSSL has been successfully configured                     ***
***                                                                ***
***   If you encounter a problem while building, please open an    ***
***   issue on GitHub <https://github.com/openssl/openssl/issues>  ***
***   and include the output from the following command:           ***
***                                                                ***
***       perl configdata.pm --dump                                ***
***                                                                ***
***   (If you are new to OpenSSL, you might want to consult the    ***
***   'Troubleshooting' section in the INSTALL.md file first)      ***
***                                                                ***
**********************************************************************
EOF

exit(0);

######################################################################
#
# Helpers and utility functions
#

# Death handler, to print a helpful message in case of failure #######
#
sub death_handler {
    die @_ if $^S;              # To prevent the added message in eval blocks
    my $build_file = $target{build_file} // "build file";
    my @message = ( <<"_____", @_ );

Failure!  $build_file wasn't produced.
Please read INSTALL.md and associated NOTES files.  You may also have to
look over your available compiler tool chain or change your configuration.

_____

    # Dying is terminal, so it's ok to reset the signal handler here.
    $SIG{__DIE__} = $orig_death_handler;
    die @message;
}

# Configuration file reading #########################################

# Note: All of the helper functions are for lazy evaluation.  They all
# return a CODE ref, which will return the intended value when evaluated.
# Thus, whenever there's mention of a returned value, it's about that
# intended value.

# Helper function to implement conditional value variants, with a default
# plus additional values based on the value of $config{build_type}.
# Arguments are given in hash table form:
#
#       picker(default => "Basic string: ",
#              debug   => "debug",
#              release => "release")
#
# When configuring with --debug, the resulting string will be
# "Basic string: debug", and when not, it will be "Basic string: release"
#
# This can be used to create variants of sets of flags according to the
# build type:
#
#       cflags => picker(default => "-Wall",
#                        debug   => "-g -O0",
#                        release => "-O3")
#
sub picker {
    my %opts = @_;
    return sub { add($opts{default} || (),
                     $opts{$config{build_type}} || ())->(); }
}

# Helper function to combine several values of different types into one.
# This is useful if you want to combine a string with the result of a
# lazy function, such as:
#
#       cflags => combine("-Wall", sub { $disabled{zlib} ? () : "-DZLIB" })
#
sub combine {
    my @stuff = @_;
    return sub { add(@stuff)->(); }
}

# Helper function to implement conditional values depending on the value
# of $disabled{threads}.  Can be used as follows:
#
#       cflags => combine("-Wall", threads("-pthread"))
#
sub threads {
    my @flags = @_;
    return sub { add($disabled{threads} ? () : @flags)->(); }
}

sub shared {
    my @flags = @_;
    return sub { add($disabled{shared} ? () : @flags)->(); }
}

our $add_called = 0;
# Helper function to implement adding values to already existing configuration
# values.  It handles elements that are ARRAYs, CODEs and scalars
sub _add {
    my $separator = shift;

    # If there's any ARRAY in the collection of values OR the separator
    # is undef, we will return an ARRAY of combined values, otherwise a
    # string of joined values with $separator as the separator.
    my $found_array = !defined($separator);

    my @values =
        map {
            my $res = $_;
            while (ref($res) eq "CODE") {
                $res = $res->();
            }
            if (defined($res)) {
                if (ref($res) eq "ARRAY") {
                    $found_array = 1;
                    @$res;
                } else {
                    $res;
                }
            } else {
                ();
            }
    } (@_);

    $add_called = 1;

    if ($found_array) {
        [ @values ];
    } else {
        join($separator, grep { defined($_) && $_ ne "" } @values);
    }
}
sub add_before {
    my $separator = " ";
    if (ref($_[$#_]) eq "HASH") {
        my $opts = pop;
        $separator = $opts->{separator};
    }
    my @x = @_;
    sub { _add($separator, @x, @_) };
}
sub add {
    my $separator = " ";
    if (ref($_[$#_]) eq "HASH") {
        my $opts = pop;
        $separator = $opts->{separator};
    }
    my @x = @_;
    sub { _add($separator, @_, @x) };
}

sub read_eval_file {
    my $fname = shift;
    my $content;
    my @result;

    open F, "< $fname" or die "Can't open '$fname': $!\n";
    {
        undef local $/;
        $content = <F>;
    }
    close F;
    {
        local $@;

        @result = ( eval $content );
        warn $@ if $@;
    }
    return wantarray ? @result : $result[0];
}

# configuration reader, evaluates the input file as a perl script and expects
# it to fill %targets with target configurations.  Those are then added to
# %table.
sub read_config {
    my $fname = shift;
    my %targets;

    {
        # Protect certain tables from tampering
        local %table = ();

        %targets = read_eval_file($fname);
    }
    my %preexisting = ();
    foreach (sort keys %targets) {
        $preexisting{$_} = 1 if $table{$_};
    }
    die <<"EOF",
The following config targets from $fname
shadow pre-existing config targets with the same name:
EOF
        map { "  $_\n" } sort keys %preexisting
        if %preexisting;


    # For each target, check that it's configured with a hash table.
    foreach (keys %targets) {
        if (ref($targets{$_}) ne "HASH") {
            if (ref($targets{$_}) eq "") {
                warn "Deprecated target configuration for $_, ignoring...\n";
            } else {
                warn "Misconfigured target configuration for $_ (should be a hash table), ignoring...\n";
            }
            delete $targets{$_};
        } else {
            $targets{$_}->{_conf_fname_int} = add([ $fname ]);
        }
    }

    %table = (%table, %targets);

}

# configuration resolver.  Will only resolve all the lazy evaluation
# codeblocks for the chosen target and all those it inherits from,
# recursively
sub resolve_config {
    my $target = shift;
    my @breadcrumbs = @_;

#    my $extra_checks = defined($ENV{CONFIGURE_EXTRA_CHECKS});

    if (grep { $_ eq $target } @breadcrumbs) {
        die "inherit_from loop!  target backtrace:\n  "
            ,$target,"\n  ",join("\n  ", @breadcrumbs),"\n";
    }

    if (!defined($table{$target})) {
        warn "Warning! target $target doesn't exist!\n";
        return ();
    }
    # Recurse through all inheritances.  They will be resolved on the
    # fly, so when this operation is done, they will all just be a
    # bunch of attributes with string values.
    # What we get here, though, are keys with references to lists of
    # the combined values of them all.  We will deal with lists after
    # this stage is done.
    my %combined_inheritance = ();
    if ($table{$target}->{inherit_from}) {
        my @inherit_from =
            map { ref($_) eq "CODE" ? $_->() : $_ } @{$table{$target}->{inherit_from}};
        foreach (@inherit_from) {
            my %inherited_config = resolve_config($_, $target, @breadcrumbs);

            # 'template' is a marker that's considered private to
            # the config that had it.
            delete $inherited_config{template};

            foreach (keys %inherited_config) {
                if (!$combined_inheritance{$_}) {
                    $combined_inheritance{$_} = [];
                }
                push @{$combined_inheritance{$_}}, $inherited_config{$_};
            }
        }
    }

    # We won't need inherit_from in this target any more, since we've
    # resolved all the inheritances that lead to this
    delete $table{$target}->{inherit_from};

    # Now is the time to deal with those lists.  Here's the place to
    # decide what shall be done with those lists, all based on the
    # values of the target we're currently dealing with.
    # - If a value is a coderef, it will be executed with the list of
    #   inherited values as arguments.
    # - If the corresponding key doesn't have a value at all or is the
    #   empty string, the inherited value list will be run through the
    #   default combiner (below), and the result becomes this target's
    #   value.
    # - Otherwise, this target's value is assumed to be a string that
    #   will simply override the inherited list of values.
    my $default_combiner = add();

    my %all_keys =
        map { $_ => 1 } (keys %combined_inheritance,
                         keys %{$table{$target}});

    sub process_values {
        my $object    = shift;
        my $inherited = shift;  # Always a [ list ]
        my $target    = shift;
        my $entry     = shift;

        $add_called = 0;

        while(ref($object) eq "CODE") {
            $object = $object->(@$inherited);
        }
        if (!defined($object)) {
            return ();
        }
        elsif (ref($object) eq "ARRAY") {
            local $add_called;  # To make sure recursive calls don't affect it
            return [ map { process_values($_, $inherited, $target, $entry) }
                     @$object ];
        } elsif (ref($object) eq "") {
            return $object;
        } else {
            die "cannot handle reference type ",ref($object)
                ," found in target ",$target," -> ",$entry,"\n";
        }
    }

    foreach (sort keys %all_keys) {
        my $previous = $combined_inheritance{$_};

        # Current target doesn't have a value for the current key?
        # Assign it the default combiner, the rest of this loop body
        # will handle it just like any other coderef.
        if (!exists $table{$target}->{$_}) {
            $table{$target}->{$_} = $default_combiner;
        }

        $table{$target}->{$_} = process_values($table{$target}->{$_},
                                               $combined_inheritance{$_},
                                               $target, $_);
        unless(defined($table{$target}->{$_})) {
            delete $table{$target}->{$_};
        }
#        if ($extra_checks &&
#            $previous && !($add_called ||  $previous ~~ $table{$target}->{$_})) {
#            warn "$_ got replaced in $target\n";
#        }
    }

    # Finally done, return the result.
    return %{$table{$target}};
}

sub usage
        {
        print STDERR $usage;
        print STDERR "\npick os/compiler from:\n";
        my $j=0;
        my $i;
        my $k=0;
        foreach $i (sort keys %table)
                {
                next if $table{$i}->{template};
                next if $i =~ /^debug/;
                $k += length($i) + 1;
                if ($k > 78)
                        {
                        print STDERR "\n";
                        $k=length($i);
                        }
                print STDERR $i . " ";
                }
        foreach $i (sort keys %table)
                {
                next if $table{$i}->{template};
                next if $i !~ /^debug/;
                $k += length($i) + 1;
                if ($k > 78)
                        {
                        print STDERR "\n";
                        $k=length($i);
                        }
                print STDERR $i . " ";
                }
        print STDERR "\n\nNOTE: If in doubt, on Unix-ish systems use './config'.\n";
        exit(1);
        }

sub compiler_predefined {
    state %predefined;
    my $cc = shift;

    return () if $^O eq 'VMS';

    die 'compiler_predefined called without a compiler command'
        unless $cc;

    if (! $predefined{$cc}) {

        $predefined{$cc} = {};

        # collect compiler pre-defines from gcc or gcc-alike...
        open(PIPE, "$cc -dM -E -x c /dev/null 2>&1 |");
        while (my $l = <PIPE>) {
            $l =~ m/^#define\s+(\w+(?:\(\w+\))?)(?:\s+(.+))?/ or last;
            $predefined{$cc}->{$1} = $2 // '';
        }
        close(PIPE);
    }

    return %{$predefined{$cc}};
}

sub which
{
    my ($name)=@_;

    if (eval { require IPC::Cmd; 1; }) {
        IPC::Cmd->import();
        return scalar IPC::Cmd::can_run($name);
    } else {
        # if there is $directories component in splitpath,
        # then it's not something to test with $PATH...
        return $name if (File::Spec->splitpath($name))[1];

        foreach (File::Spec->path()) {
            my $fullpath = catfile($_, "$name$target{exe_extension}");
            if (-f $fullpath and -x $fullpath) {
                return $fullpath;
            }
        }
    }
}

sub env
{
    my $name = shift;
    my %opts = @_;

    unless ($opts{cacheonly}) {
        # Note that if $ENV{$name} doesn't exist or is undefined,
        # $config{perlenv}->{$name} will be created with the value
        # undef.  This is intentional.

        $config{perlenv}->{$name} = $ENV{$name}
            if ! exists $config{perlenv}->{$name};
    }
    return $config{perlenv}->{$name};
}

# Configuration printer ##############################################

sub print_table_entry
{
    local $now_printing = shift;
    my %target = resolve_config($now_printing);
    my $type = shift;

    # Don't print the templates
    return if $target{template};

    my @sequence = (
        "sys_id",
        "cpp",
        "cppflags",
        "defines",
        "includes",
        "cc",
        "cflags",
        "ld",
        "lflags",
        "loutflag",
        "ex_libs",
        "bn_ops",
        "poly1035_asm_src",
        "thread_scheme",
        "perlasm_scheme",
        "dso_scheme",
        "shared_target",
        "shared_cflag",
        "shared_defines",
        "shared_ldflag",
        "shared_rcflag",
        "shared_extension",
        "dso_extension",
        "obj_extension",
        "exe_extension",
        "ranlib",
        "ar",
        "arflags",
        "aroutflag",
        "rc",
        "rcflags",
        "rcoutflag",
        "mt",
        "mtflags",
        "mtinflag",
        "mtoutflag",
        "multilib",
        "build_scheme",
        );

    if ($type eq "TABLE") {
        print "\n";
        print "*** $now_printing\n";
        foreach (@sequence) {
            if (ref($target{$_}) eq "ARRAY") {
                printf "\$%-12s = %s\n", $_, join(" ", @{$target{$_}});
            } else {
                printf "\$%-12s = %s\n", $_, $target{$_};
            }
        }
    } elsif ($type eq "HASH") {
        my $largest =
            length((sort { length($a) <=> length($b) } @sequence)[-1]);
        print "    '$now_printing' => {\n";
        foreach (@sequence) {
            if ($target{$_}) {
                if (ref($target{$_}) eq "ARRAY") {
                    print "      '",$_,"'"," " x ($largest - length($_))," => [ ",join(", ", map { "'$_'" } @{$target{$_}})," ],\n";
                } else {
                    print "      '",$_,"'"," " x ($largest - length($_))," => '",$target{$_},"',\n";
                }
            }
        }
        print "    },\n";
    }
}

# Utility routines ###################################################

# On VMS, if the given file is a logical name, File::Spec::Functions
# will consider it an absolute path.  There are cases when we want a
# purely syntactic check without checking the environment.
sub isabsolute {
    my $file = shift;

    # On non-platforms, we just use file_name_is_absolute().
    return file_name_is_absolute($file) unless $^O eq "VMS";

    # If the file spec includes a device or a directory spec,
    # file_name_is_absolute() is perfectly safe.
    return file_name_is_absolute($file) if $file =~ m|[:\[]|;

    # Here, we know the given file spec isn't absolute
    return 0;
}

# Makes a directory absolute and cleans out /../ in paths like foo/../bar
# On some platforms, this uses rel2abs(), while on others, realpath() is used.
# realpath() requires that at least all path components except the last is an
# existing directory.  On VMS, the last component of the directory spec must
# exist.
sub absolutedir {
    my $dir = shift;

    # realpath() is quite buggy on VMS.  It uses LIB$FID_TO_NAME, which
    # will return the volume name for the device, no matter what.  Also,
    # it will return an incorrect directory spec if the argument is a
    # directory that doesn't exist.
    if ($^O eq "VMS") {
        return rel2abs($dir);
    }

    # We use realpath() on Unix, since no other will properly clean out
    # a directory spec.
    use Cwd qw/realpath/;

    return realpath($dir);
}

sub quotify {
    my %processors = (
        perl    => sub { my $x = shift;
                         $x =~ s/([\\\$\@"])/\\$1/g;
                         return '"'.$x.'"'; },
        maybeshell => sub { my $x = shift;
                            (my $y = $x) =~ s/([\\\"])/\\$1/g;
                            if ($x ne $y || $x =~ m|\s|) {
                                return '"'.$y.'"';
                            } else {
                                return $x;
                            }
                        },
        );
    my $for = shift;
    my $processor =
        defined($processors{$for}) ? $processors{$for} : sub { shift; };

    return map { $processor->($_); } @_;
}

# collect_from_file($filename, $line_concat_cond_re, $line_concat)
# $filename is a file name to read from
# $line_concat_cond_re is a regexp detecting a line continuation ending
# $line_concat is a CODEref that takes care of concatenating two lines
sub collect_from_file {
    my $filename = shift;
    my $line_concat_cond_re = shift;
    my $line_concat = shift;

    open my $fh, $filename || die "unable to read $filename: $!\n";
    return sub {
        my $saved_line = "";
        $_ = "";
        while (<$fh>) {
            s|\R$||;
            if (defined $line_concat) {
                $_ = $line_concat->($saved_line, $_);
                $saved_line = "";
            }
            if (defined $line_concat_cond_re && /$line_concat_cond_re/) {
                $saved_line = $_;
                next;
            }
            return $_;
        }
        die "$filename ending with continuation line\n" if $_;
        close $fh;
        return undef;
    }
}

# collect_from_array($array, $line_concat_cond_re, $line_concat)
# $array is an ARRAYref of lines
# $line_concat_cond_re is a regexp detecting a line continuation ending
# $line_concat is a CODEref that takes care of concatenating two lines
sub collect_from_array {
    my $array = shift;
    my $line_concat_cond_re = shift;
    my $line_concat = shift;
    my @array = (@$array);

    return sub {
        my $saved_line = "";
        $_ = "";
        while (defined($_ = shift @array)) {
            s|\R$||;
            if (defined $line_concat) {
                $_ = $line_concat->($saved_line, $_);
                $saved_line = "";
            }
            if (defined $line_concat_cond_re && /$line_concat_cond_re/) {
                $saved_line = $_;
                next;
            }
            return $_;
        }
        die "input text ending with continuation line\n" if $_;
        return undef;
    }
}

# collect_information($lineiterator, $line_continue, $regexp => $CODEref, ...)
# $lineiterator is a CODEref that delivers one line at a time.
# All following arguments are regex/CODEref pairs, where the regexp detects a
# line and the CODEref does something with the result of the regexp.
sub collect_information {
    my $lineiterator = shift;
    my %collectors = @_;

    while(defined($_ = $lineiterator->())) {
        s|\R$||;
        my $found = 0;
        if ($collectors{"BEFORE"}) {
            $collectors{"BEFORE"}->($_);
        }
        foreach my $re (keys %collectors) {
            if ($re !~ /^OTHERWISE|BEFORE|AFTER$/ && /$re/) {
                $collectors{$re}->($lineiterator);
                $found = 1;
            };
        }
        if ($collectors{"OTHERWISE"}) {
            $collectors{"OTHERWISE"}->($lineiterator, $_)
                unless $found || !defined $collectors{"OTHERWISE"};
        }
        if ($collectors{"AFTER"}) {
            $collectors{"AFTER"}->($_);
        }
    }
}

# tokenize($line)
# tokenize($line,$separator)
# $line is a line of text to split up into tokens
# $separator [optional] is a regular expression that separates the tokens,
# the default being spaces.  Do not use quotes of any kind as separators,
# that will give undefined results.
# Returns a list of tokens.
#
# Tokens are divided by separator (spaces by default).  If the tokens include
# the separators, they have to be quoted with single or double quotes.
# Double quotes inside a double quoted token must be escaped.  Escaping is done
# with backslash.
# Basically, the same quoting rules apply for " and ' as in any
# Unix shell.
sub tokenize {
    my $line = my $debug_line = shift;
    my $separator = shift // qr|\s+|;
    my @result = ();

    if ($ENV{CONFIGURE_DEBUG_TOKENIZE}) {
        print STDERR "DEBUG[tokenize]: \$separator = $separator\n";
    }

    while ($line =~ s|^${separator}||, $line ne "") {
        my $token = "";
    again:
        $line =~ m/^(.*?)(${separator}|"|'|$)/;
        $token .= $1;
        $line = $2.$';

        if ($line =~ m/^"((?:[^"\\]+|\\.)*)"/) {
            $token .= $1;
            $line = $';
            goto again;
        } elsif ($line =~ m/^'([^']*)'/) {
            $token .= $1;
            $line = $';
            goto again;
        }
        push @result, $token;
    }

    if ($ENV{CONFIGURE_DEBUG_TOKENIZE}) {
        print STDERR "DEBUG[tokenize]: Parsed '$debug_line' into:\n";
        print STDERR "DEBUG[tokenize]: ('", join("', '", @result), "')\n";
    }
    return @result;
}