summaryrefslogtreecommitdiff
path: root/configure.ac
blob: f1c926903c8f2575e53a9aebedf33620c9d00055 (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
dnl == autoconf source for the Glasgow FP tools ==
dnl (run "grep '^dnl \*' configure.ac | sed -e 's/dnl / /g; s/\*\*/   +/g;'"
dnl  (or some such) to see the outline of this file)
dnl
#
# (c) The University of Glasgow 1994-2012
#
# Configure script template for GHC
#
# Process with 'autoreconf' to get a working configure script.
#
# For the generated configure script, do "./configure --help" to
# see what flags are available. (Better yet, read the documentation!)
#

AC_INIT([The Glorious Glasgow Haskell Compilation System], [8.9.0], [glasgow-haskell-bugs@haskell.org], [ghc-AC_PACKAGE_VERSION])

# Set this to YES for a released version, otherwise NO
: ${RELEASE=NO}

# The primary version (e.g. 7.5, 7.4.1) is set in the AC_INIT line
# above.  If this is not a released version, then we will append the
# date to the version number (e.g. 7.4.20111220).  The date is
# constructed by finding the date of the most recent patch in the
# git repository.  If this is a source distribution (not a git
# checkout), then we ship a file 'VERSION' containing the full version
# when the source distribution was created.

if test ! -f mk/config.h.in; then
   echo "mk/config.h.in doesn't exist: perhaps you haven't run 'python3 boot'?"
   exit 1
fi

dnl this makes sure `./configure --target=<cross-compile-target>`
dnl works as expected, since we're slightly modifying how Autoconf
dnl interprets build/host/target and how this interacts with $CC tests
test -n "$target_alias" && ac_tool_prefix=$target_alias-

dnl ----------------------------------------------------------
dnl ** Find unixy sort and find commands,
dnl ** which are needed by FP_SETUP_PROJECT_VERSION

dnl ** Find find command (for Win32's benefit)
FP_PROG_FIND
FP_PROG_SORT

dnl ----------------------------------------------------------
FP_SETUP_PROJECT_VERSION

# Hmmm, we fix the RPM release number to 1 here... Is this convenient?
AC_SUBST([release], [1])

# First off, a distrib sanity check..
AC_CONFIG_SRCDIR([mk/config.mk.in])

dnl * We require autoconf version 2.69 due to
dnl   https://bugs.ruby-lang.org/issues/8179. Also see #14910.
dnl * We need 2.50 due to the use of AC_SYS_LARGEFILE and AC_MSG_NOTICE.
dnl * We need 2.52 due to the use of AS_TR_CPP and AS_TR_SH.
dnl * Using autoconf 2.59 started to give nonsense like this
dnl     #define SIZEOF_CHAR 0
dnl   recently.
AC_PREREQ([2.69])

# -------------------------------------------------------------------------
# Prepare to generate the following header files
#
#
AC_CONFIG_HEADER(mk/config.h)

# No, semi-sadly, we don't do `--srcdir'...
if test x"$srcdir" != 'x.' ; then
    echo "This configuration does not support the \`--srcdir' option.."
    exit 1
fi

dnl --------------------------------------------------------------
dnl * Project specific configuration options
dnl --------------------------------------------------------------
dnl What follows is a bunch of options that can either be configured
dnl through command line options to the configure script or by
dnl supplying defns in the build tree's mk/build.mk. Having the option to
dnl use either is considered a Feature.

dnl ** What command to use to compile compiler sources ?
dnl --------------------------------------------------------------

AC_ARG_VAR(GHC,[Use as the path to GHC [default=autodetect]])
AC_PATH_PROG([GHC], [ghc])
AC_ARG_WITH([ghc],
        AS_HELP_STRING([--with-ghc=ARG], [Use ARG as the path to ghc (obsolete, use GHC=ARG instead) [default=autodetect]]),
        AC_MSG_ERROR([--with-ghc=$withval is obsolete (use './configure GHC=$withval' or 'GHC=$withval ./configure' instead)]))
AC_SUBST(WithGhc,$GHC)

AC_ARG_ENABLE(bootstrap-with-devel-snapshot,
[AC_HELP_STRING([--enable-bootstrap-with-devel-snapshot],
                [Allow bootstrapping using a development snapshot of GHC.  This is not guaranteed to work.])],
        EnableBootstrapWithDevelSnaphost=YES,
        EnableBootstrapWithDevelSnaphost=NO
)

AC_ARG_ENABLE(tarballs-autodownload,
[AC_HELP_STRING([--enable-tarballs-autodownload],
                [Automatically download Windows distribution binaries if needed.])],
        TarballsAutodownload=YES,
        TarballsAutodownload=NO
)

AC_ARG_ENABLE(distro-toolchain,
[AC_HELP_STRING([--enable-distro-toolchain],
                [Do not use bundled Windows toolchain binaries.])],
        EnableDistroToolchain=YES,
        EnableDistroToolchain=NO
)

if test "$EnableDistroToolchain" = "YES"; then
  TarballsAutodownload=NO
fi

dnl CC_STAGE0 is like the "previous" variable CC (inherited by CC_STAGE[123])
dnl but instead used by stage0 for bootstrapping stage1
AC_ARG_VAR(CC_STAGE0, [C compiler command (bootstrap)])

if test "$WithGhc" != ""; then
  FPTOOLS_GHC_VERSION([GhcVersion], [GhcMajVersion], [GhcMinVersion], [GhcPatchLevel])dnl

  if test "$GhcMajVersion" = "unknown" || test "$GhcMinVersion" = "unknown"; then
     AC_MSG_ERROR([Cannot determine the version of $WithGhc.  Is it really GHC?])
  fi

  AC_SUBST(GhcVersion)dnl
  AC_SUBST(GhcMajVersion)dnl
  AC_SUBST(GhcMinVersion)dnl
  AC_SUBST(GhcPatchLevel)dnl
  GhcMinVersion2=`echo "$GhcMinVersion" | sed 's/^\\(.\\)$/0\\1/'`
  GhcCanonVersion="$GhcMajVersion$GhcMinVersion2"

  dnl infer CC_STAGE0 from `ghc --info` unless explicitly set by user
  if test -z "$CC_STAGE0"; then
    BOOTSTRAPPING_GHC_INFO_FIELD([CC_STAGE0],[C compiler command])
  fi

  BOOTSTRAPPING_GHC_INFO_FIELD([LD_STAGE0],[ld command])
  BOOTSTRAPPING_GHC_INFO_FIELD([AR_STAGE0],[ar command])
  BOOTSTRAPPING_GHC_INFO_FIELD([AR_OPTS_STAGE0],[ar flags])
  BOOTSTRAPPING_GHC_INFO_FIELD([ArSupportsAtFile_STAGE0],[ar supports at file])
fi

dnl ** Must have GHC to build GHC
if test "$WithGhc" = ""
then
    AC_MSG_ERROR([GHC is required.])
fi
FP_COMPARE_VERSIONS([$GhcVersion],[-lt],[8.6],
    [AC_MSG_ERROR([GHC version 8.6 or later is required to compile GHC.])])

if test `expr $GhcMinVersion % 2` = "1"
then
    if test "$EnableBootstrapWithDevelSnaphost" = "NO"
    then
        AC_MSG_ERROR([
     $WithGhc is a development snapshot of GHC, version $GhcVersion.
     Bootstrapping using this version of GHC is not supported, and may not
     work.  Use --enable-bootstrap-with-devel-snapshot to try it anyway,
     or 'GHC=' to specify a different GHC to use.])
    fi
fi

# GHC is passed to Cabal, so we need a native path
if test "${WithGhc}" != ""
then
    ghc_host_os=`"${WithGhc}" +RTS --info | grep 'Host OS' | sed -e 's/.*, "//' -e 's/")//'`

    if test "$ghc_host_os" = "mingw32"
    then
        if test "${OSTYPE}" = "msys"
        then
            WithGhc=`echo "${WithGhc}" | sed "s#^/\([a-zA-Z]\)/#\1:/#"`
        else
            # Canonicalise to <drive>:/path/to/ghc
            WithGhc=`cygpath -m "${WithGhc}"`
        fi
        echo "GHC path canonicalised to: ${WithGhc}"
    fi
fi
AC_SUBST([WithGhc])

dnl ** Without optimization some INLINE trickery fails for GHCi
SRC_CC_OPTS="-O"

dnl--------------------------------------------------------------------
dnl * Choose host(/target/build) platform
dnl--------------------------------------------------------------------
dnl If we aren't explicitly told what values to use with configure flags,
dnl we ask the bootstrapping compiler what platform it is for

if test "${WithGhc}" != ""
then
        bootstrap_host=`"${WithGhc}" +RTS --info | grep '^ ,("Host platform"' | sed -e 's/.*, "//' -e 's/")//' | tr -d '\r'`
        bootstrap_target=`"${WithGhc}" +RTS --info | grep '^ ,("Target platform"' | sed -e 's/.*, "//' -e 's/")//' | tr -d '\r'`
        if test "$bootstrap_host" != "$bootstrap_target"
        then
                echo "Bootstrapping GHC is a cross compiler. This probably isn't going to work"
        fi
fi

# We have to run these unconditionally, but we may discard their
# results in the following code
AC_CANONICAL_BUILD
AC_CANONICAL_HOST
AC_CANONICAL_TARGET

FPTOOLS_SET_PLATFORM_VARS

# Verify that the installed (bootstrap) GHC is capable of generating
# code for the requested build platform.
if test "$BuildPlatform" != "$bootstrap_target"
then
    echo "This GHC (${WithGhc}) does not generate code for the build platform"
    echo "   GHC target platform    : $bootstrap_target"
    echo "   Desired build platform : $BuildPlatform"
    exit 1
fi

# Testing if we shall enable shared libs support on Solaris.
# Anything older than SunOS 5.11 aka Solaris 11 (Express) is broken.

SOLARIS_BROKEN_SHLD=NO

case $host in
     i386-*-solaris2)
     # here we go with the test
     MINOR=`uname -r|cut -d '.' -f 2-`
     if test "$MINOR" -lt "11"; then
         SOLARIS_BROKEN_SHLD=YES
     fi
     ;;
esac

AC_SUBST(SOLARIS_BROKEN_SHLD)

dnl ** Do an unregisterised build?
dnl --------------------------------------------------------------

AC_MSG_CHECKING(whether target supports a registerised ABI)
case "$TargetArch" in
    i386|x86_64|powerpc|powerpc64|powerpc64le|arm|aarch64)
        UnregisterisedDefault=NO
        AC_MSG_RESULT([yes])
        ;;
    *)
        UnregisterisedDefault=YES
        AC_MSG_RESULT([no])
        ;;
esac
FP_DEFAULT_CHOICE_OVERRIDE_CHECK(
  [unregisterised],
  [unregisterised],
  [registerised],
  [Unregisterised],
  [Build a toolchain with the unregisterised ABI (disabled by default on platforms with registerised support)],
  [NO],
  [YES],
  [no])
AC_SUBST(Unregisterised)

dnl ** Do a build with tables next to code?
dnl
dnl Whether the target architecture supports placing info tables
dnl directly before the entry code (see TABLES_NEXT_TO_CODE in the RTS).
dnl Whether we actually compile for TABLES_NEXT_TO_CODE depends on
dnl whether we're building unregisterised code or not, which may be
dnl decided by options to the compiler later.
dnl
dnl See https://gitlab.haskell.org/ghc/ghc/wikis/commentary/rts/storage/heap-objects#tables_next_to_code
dnl --------------------------------------------------------------

AC_MSG_CHECKING(whether target supports tables next to code)
case "$Unregisterised" in
    NO)
        case "$TargetArch" in
            ia64|powerpc64|powerpc64le)
                TablesNextToCodeDefault=NO
                AC_MSG_RESULT([no])
                ;;
            *)
                TablesNextToCodeDefault=YES
                AC_MSG_RESULT([yes])
                ;;
        esac
        ;;
    YES)
        TablesNextToCodeDefault=NO
        AC_MSG_RESULT([no])
        ;;
esac
FP_DEFAULT_CHOICE_OVERRIDE_CHECK(
  [tables-next-to-code],
  [tables next to code],
  [tables apart from code],
  [TablesNextToCode],
  [Build a tool chain with info tables layed out next to code (enabled by default when using the registerised ABI, on platforms that support it)])
if test x"$TablesNextToCode" = xYES; then
   AC_DEFINE([TABLES_NEXT_TO_CODE], [1], [Define to 1 if info tables are layed out next to code])
fi
AC_SUBST(TablesNextToCode)

dnl ** Does target have runtime linker support?
dnl --------------------------------------------------------------
case "$target" in
    powerpc64-*|powerpc64le-*|powerpc-ibm-aix*)
        TargetHasRTSLinker=NO
        ;;
    *)
        TargetHasRTSLinker=YES
        ;;
esac
AC_SUBST(TargetHasRTSLinker)

# Requires FPTOOLS_SET_PLATFORM_VARS to be run first.
FP_FIND_ROOT


if test "$HostOS" = "mingw32"
then
    # Find the mingw-w64 7z file to extract.
    # NB. If you update the tarballs to a new version of gcc, don't
    # forget to tweak the paths in driver/gcc/gcc.c.
    if test "$HostArch" = "i386"
    then
        mingw_arch="i686"
        tarball_dest_dir="mingw-w64/i686"
        tarball_mingw_dir="mingw32"
    else
        mingw_arch="x86_64"
        tarball_dest_dir="mingw-w64/x86_64"
        tarball_mingw_dir="mingw64"
    fi
fi

set_up_tarballs() {
    AC_MSG_NOTICE([Checking for Windows toolchain tarballs...])
    local action
    if test "$TarballsAutodownload" = "NO"
    then
        action="verify"
    else
        action="download"
    fi
    mk/get-win32-tarballs.sh $action $HostArch > missing-win32-tarballs
    case $? in
        0)
           rm missing-win32-tarballs
           ;;
        2)
           echo
           echo "Error:"
           echo "Needed msys2 tarballs are missing. You have a few options to get them,"
           echo
           echo "  * run configure with the --enable-tarballs-autodownload option"
           echo
           echo "  * run mk/get-win32-tarballs.sh download ${HostArch}"
           echo
           echo "  * manually download the files listed in ./missing-win32-tarballs and place"
           echo "    them in the ghc-tarballs directory."
           echo
           exit 1
           ;;
        *)
           echo
           echo "Error fetching msys2 tarballs; see errors above."
           exit 1
           ;;
    esac

    # Extract all the tarballs in one go
    if ! test -d inplace/mingw
    then
        AC_MSG_NOTICE([Extracting Windows toolchain from archives (may take a while)...])
        rm -rf inplace/mingw
        local base_dir="../ghc-tarballs/${tarball_dest_dir}"
        ( cd inplace &&
        find "${base_dir}" -name "*.tar.xz" -exec tar xfJ {} \; &&
        rm ".MTREE" &&
        rm ".PKGINFO" &&
        cd .. ) || AC_MSG_ERROR([Could not extract Windows toolchains.])

        mv "inplace/${tarball_mingw_dir}" inplace/mingw &&
        touch inplace/mingw

        # NB. Now since the GCC is hardcoded to use /mingw32 we need to
        # make a wrapper around it to give it the proper paths
        mv inplace/mingw/bin/gcc.exe inplace/mingw/bin/realgcc.exe
        PATH=`pwd`/inplace/mingw/bin:$PATH
        inplace/mingw/bin/realgcc.exe driver/gcc/gcc.c driver/utils/cwrapper.c driver/utils/getLocation.c -Idriver/utils -o inplace/mingw/bin/gcc.exe

        AC_MSG_NOTICE([In-tree MingW-w64 tree created])
    fi
}

if test "$HostOS" = "mingw32" -a "$EnableDistroToolchain" = "NO"
then
    test -d inplace || mkdir inplace

    # NB. Download and extract the MingW-w64 distribution if required
    set_up_tarballs

    mingwbin="$hardtop/inplace/mingw/bin/"
    CC="${mingwbin}gcc.exe"
    LD="${mingwbin}ld.exe"
    NM="${mingwbin}nm.exe"
    RANLIB="${mingwbin}ranlib.exe"
    OBJDUMP="${mingwbin}objdump.exe"
    fp_prog_ar="${mingwbin}ar.exe"

    AC_PATH_PROG([Genlib],[genlib])
fi

# We don't want to bundle a MinGW-w64 toolchain
# So we have to find these individual tools.
if test "$EnableDistroToolchain" = "YES"
then
    # Ideally should use AC_CHECK_TARGET_TOOL but our triples
    # are screwed up. Configure doesn't think they're ever equal and
    # so never tried without the prefix.
    AC_PATH_PROG([CC],[gcc], [clang])
    AC_PATH_PROG([NM],[nm])
    AC_PATH_PROG([AR],[ar])
    AC_PATH_PROG([RANLIB],[ranlib])
    AC_PATH_PROG([OBJDUMP],[objdump])
    AC_PATH_PROG([DllWrap],[dllwrap])
    AC_PATH_PROG([Windres],[windres])
    AC_PATH_PROG([Genlib],[genlib])
else
    AC_CHECK_TARGET_TOOL([Windres],[windres])
    AC_CHECK_TARGET_TOOL([DllWrap],[dllwrap])
    AC_CHECK_TARGET_TOOL([OBJDUMP],[objdump])
fi

DllWrapCmd="$DllWrap"
WindresCmd="$Windres"

HAVE_GENLIB=False
if test "$HostOS" = "mingw32"
then
    if test "$Genlib" != ""; then
        GenlibCmd="$(cygpath -m $Genlib)"
        HAVE_GENLIB=True
    fi
fi

AC_SUBST([DllWrapCmd])
AC_SUBST([WindresCmd])
AC_SUBST([GenlibCmd])
AC_SUBST([HAVE_GENLIB])

FP_ICONV
FP_GMP
FP_CURSES

XCODE_VERSION()


dnl ** Building a cross compiler?
dnl --------------------------------------------------------------
CrossCompiling=NO
# If 'host' and 'target' differ, then this means we are building a cross-compiler.
if test "$TargetPlatform" != "$HostPlatform" ; then
    CrossCompiling=YES
    cross_compiling=yes   # This tells configure that it can accept just 'target',
                          # otherwise you get
                          #   configure: error: cannot run C compiled programs.
                          #   If you meant to cross compile, use `--host'.
fi
if test "$BuildPlatform" != "$HostPlatform" ; then
   AC_MSG_ERROR([
You've selected:

  BUILD:  $BuildPlatform   (the architecture we're building on)
  HOST:   $HostPlatform    (the architecture the compiler we're building will execute on)
  TARGET: $TargetPlatform  (the architecture the compiler we're building will produce code for)

BUILD must equal HOST; that is, we do not support building GHC itself
with a cross-compiler.  To cross-compile GHC itself, set TARGET: stage
1 will be a cross-compiler, and stage 2 will be the cross-compiled
GHC.
])
fi
# Despite its similarity in name to TargetPlatform, TargetPlatformFull is used
# in calls to subproject configure scripts and thus must be set to the autoconf
# triple, not the normalized GHC triple that TargetPlatform is set to.
#
# We use the non-canonicalized triple, target_alias, here since the subproject
# configure scripts will use this triple to construct the names of the toolchain
# executables. If we instead passed down the triple produced by
# AC_CANONICAL_TARGET then it may look for the target toolchain under the wrong
# name (this is a known problem in the case of the Android NDK, which has
# slightly odd triples).
#
# It may be better to just do away with the GHC triples altogether. This would
# all be taken care of for us if we configured the subprojects using
# AC_CONFIG_DIR, but unfortunately Cabal needs to be the one to do the
# configuration.
#
# We also use non-canonicalized triple when install stage1 crosscompiler
if test -z "${target_alias}"
then
  # --target wasn't given; use result from AC_CANONICAL_TARGET
  TargetPlatformFull="${target}"
else
  TargetPlatformFull="${target_alias}"
fi
if test "$CrossCompiling" = "YES"
then
  # Use value passed by user from --target=
  CrossCompilePrefix="${TargetPlatformFull}-"
else
  CrossCompilePrefix=""
fi
AC_SUBST(CrossCompiling)
AC_SUBST(CrossCompilePrefix)
AC_SUBST(TargetPlatformFull)
AC_SUBST(EnableDistroToolchain)

dnl ** Which gcc to use?
dnl --------------------------------------------------------------

AC_ARG_WITH([gcc],
        AS_HELP_STRING([--with-gcc=ARG], [Use ARG as the path to gcc (obsolete, use CC=ARG instead) [default=autodetect]]),
        AC_MSG_ERROR([--with-gcc=$withval is obsolete (use './configure CC=$withval' or 'CC=$withval ./configure' instead)]))

AC_ARG_WITH([clang],
        AS_HELP_STRING([--with-clang=ARG], [Use ARG as the path to gcc (obsolete, use CC=ARG instead) [default=autodetect]]),
        AC_MSG_ERROR([--with-clang=$withval is obsolete (use './configure CC=$withval' or 'CC=$withval ./configure' instead)]))

dnl detect compiler (prefer gcc over clang) and set $CC (unless CC already set),
dnl later CC is copied to CC_STAGE{1,2,3}
AC_PROG_CC([cc gcc clang])

MAYBE_OVERRIDE_STAGE0([ar],[AR_STAGE0])

dnl make extensions visible to allow feature-tests to detect them lateron
AC_USE_SYSTEM_EXTENSIONS

dnl ** figure out how to invoke the C preprocessor (i.e. `gcc -E`)
AC_PROG_CPP

# --with-hs-cpp/--with-hs-cpp-flags
FP_CPP_CMD_WITH_ARGS(HaskellCPPCmd, HaskellCPPArgs)
AC_SUBST([HaskellCPPCmd])
AC_SUBST([HaskellCPPArgs])

FP_SET_CFLAGS_C99([CC],[CFLAGS],[CPPFLAGS])
FP_SET_CFLAGS_C99([CC_STAGE0],[CONF_CC_OPTS_STAGE0],[CONF_CPP_OPTS_STAGE0])
FP_SET_CFLAGS_C99([CC],[CONF_CC_OPTS_STAGE1],[CONF_CPP_OPTS_STAGE1])
FP_SET_CFLAGS_C99([CC],[CONF_CC_OPTS_STAGE2],[CONF_CPP_OPTS_STAGE2])

dnl ** Which ld to use
dnl --------------------------------------------------------------
AC_ARG_VAR(LD,[Use as the path to ld. See also --disable-ld-override.])
FIND_LD([$target],[GccUseLdOpt])
CONF_GCC_LINKER_OPTS_STAGE1="$CONF_GCC_LINKER_OPTS_STAGE1 $GccUseLdOpt"
CONF_GCC_LINKER_OPTS_STAGE2="$CONF_GCC_LINKER_OPTS_STAGE2 $GccUseLdOpt"
LdCmd="$LD"
LdNoGoldCmd="$LD_NO_GOLD"
CFLAGS="$CFLAGS $GccUseLdOpt"
AC_SUBST([LdCmd])
AC_SUBST([LdNoGoldCmd])

FP_PROG_LD_IS_GNU
FP_PROG_LD_BUILD_ID
FP_PROG_LD_NO_COMPACT_UNWIND
FP_PROG_LD_FILELIST

dnl ** Which nm to use?
dnl --------------------------------------------------------------
if test "$HostOS" != "mingw32"; then
    AC_CHECK_TARGET_TOOL([NM], [nm])
    if test "$NM" = ":"; then
        AC_MSG_ERROR([cannot find nm in your PATH])
    fi
fi
NmCmd="$NM"
AC_SUBST([NmCmd])

if test "$TargetOS_CPP" = "darwin"
then
    AC_MSG_CHECKING(whether nm program is broken)
    # Some versions of XCode ship a broken version of `nm`. Detect and work
    # around this issue. See : https://gitlab.haskell.org/ghc/ghc/issues/11744
    nmver=$(${NM} --version | grep version | sed 's/ //g')
    case "$nmver" in
        LLVMversion7.3.0|LLVMversion7.3.1)
            AC_MSG_RESULT(yes)
            echo "The detected nm program is broken."
            echo
            echo "See: https://gitlab.haskell.org/ghc/ghc/issues/11744"
            echo
            echo "Try re-running configure with:"
            echo
            echo '   NM=$(xcrun --find nm-classic) ./configure'
            echo
            exit 1
            ;;
        *)
            AC_MSG_RESULT(no)
            ;;
        esac
fi

dnl ** Which objdump to use?
dnl --------------------------------------------------------------
dnl Note: we may not have objdump on OS X, and we only need it on
dnl Windows (for DLL checks), OpenBSD, and AIX
case $HostOS_CPP in
  cygwin32|mingw32|openbsd|aix)
    AC_CHECK_TARGET_TOOL([OBJDUMP], [objdump])
    ;;
esac

ObjdumpCmd="$OBJDUMP"
AC_SUBST([ObjdumpCmd])

dnl ** Which ranlib to use?
dnl --------------------------------------------------------------
AC_PROG_RANLIB
if test "$RANLIB" = ":"; then
    AC_MSG_ERROR([cannot find ranlib in your PATH])
fi
RanlibCmd="$RANLIB"
AC_SUBST([RanlibCmd])

dnl ** which strip to use?
dnl --------------------------------------------------------------
AC_CHECK_TARGET_TOOL([STRIP], [strip])
StripCmd="$STRIP"
AC_SUBST([StripCmd])


dnl ** which libtool to use?
dnl --------------------------------------------------------------
# The host normalization on Windows breaks autoconf, it no longer
# thinks that target == host so it never checks the unqualified
# tools for Windows. See #14274.
if test "$HostOS" = "mingw32"
then
    AC_PATH_PROG([LIBTOOL],[libtool])
    LibtoolCmd="$(cygpath -m $LIBTOOL)"
else
    AC_CHECK_TARGET_TOOL([LIBTOOL], [libtool])
    LibtoolCmd="$LIBTOOL"
fi
AC_SUBST([LibtoolCmd])

# Here is where we re-target which specific version of the LLVM
# tools we are looking for. In the past, GHC supported a number of
# versions of LLVM simultaneously, but that stopped working around
# 3.5/3.6 release of LLVM.
LlvmVersion=7
AC_SUBST([LlvmVersion])
sUPPORTED_LLVM_VERSION=$(echo \($LlvmVersion\) | sed 's/\./,/')
AC_DEFINE_UNQUOTED([sUPPORTED_LLVM_VERSION], ${sUPPORTED_LLVM_VERSION}, [The supported LLVM version number])

dnl ** Which LLVM clang to use?
dnl --------------------------------------------------------------
AC_ARG_VAR(CLANG,[Use as the path to clang [default=autodetect]])
AC_CHECK_TARGET_TOOL([CLANG], [clang])
ClangCmd="$CLANG"
AC_SUBST([ClangCmd])

dnl ** Which LLVM llc to use?
dnl --------------------------------------------------------------
AC_ARG_VAR(LLC,[Use as the path to LLVM's llc [default=autodetect]])
FIND_LLVM_PROG([LLC], [llc], [$LlvmVersion])
LlcCmd="$LLC"
AC_SUBST([LlcCmd])

dnl ** Which LLVM opt to use?
dnl --------------------------------------------------------------
AC_ARG_VAR(OPT,[Use as the path to LLVM's opt [default=autodetect]])
FIND_LLVM_PROG([OPT], [opt], [$LlvmVersion])
OptCmd="$OPT"
AC_SUBST([OptCmd])

dnl --------------------------------------------------------------
dnl End of configure script option section
dnl --------------------------------------------------------------

dnl ** Copy the files from the "fs" utility into the right folders.
dnl --------------------------------------------------------------
AC_MSG_NOTICE([Creating links for in-tree file handling routines.])
ln -f utils/fs/fs.* utils/lndir/
ln -f utils/fs/fs.* utils/unlit/
ln -f utils/fs/fs.* rts/
ln -f utils/fs/fs.h libraries/base/include/
ln -f utils/fs/fs.c libraries/base/cbits/
AC_MSG_NOTICE([Routines in place. Packages can now be build normally.])

dnl --------------------------------------------------------------
dnl ** Can the unix package be built?
dnl --------------------------------------------------------------

dnl ** does #! work?
AC_SYS_INTERPRETER()

dnl ** look for GCC and find out which version
dnl     Figure out which C compiler to use.  Gcc is preferred.
dnl     If gcc, make sure it's at least 3.0
dnl
FP_GCC_VERSION

dnl ** See whether gcc supports -no-pie
FP_GCC_SUPPORTS_NO_PIE

dnl ** Used to determine how to compile ghc-prim's atomics.c, used by
dnl    unregisterised, Sparc, and PPC backends.
FP_GCC_SUPPORTS__ATOMICS
AC_DEFINE([HAVE_C11_ATOMICS], [$CONF_GCC_SUPPORTS__ATOMICS], [Does GCC support __atomic primitives?])

FP_GCC_EXTRA_FLAGS

dnl ** look to see if we have a C compiler using an llvm back end.
dnl
FP_CC_LLVM_BACKEND

FPTOOLS_SET_C_LD_FLAGS([target],[CFLAGS],[LDFLAGS],[IGNORE_LINKER_LD_FLAGS],[CPPFLAGS])
FPTOOLS_SET_C_LD_FLAGS([build],[CONF_CC_OPTS_STAGE0],[CONF_GCC_LINKER_OPTS_STAGE0],[CONF_LD_LINKER_OPTS_STAGE0],[CONF_CPP_OPTS_STAGE0])
FPTOOLS_SET_C_LD_FLAGS([target],[CONF_CC_OPTS_STAGE1],[CONF_GCC_LINKER_OPTS_STAGE1],[CONF_LD_LINKER_OPTS_STAGE1],[CONF_CPP_OPTS_STAGE1])
FPTOOLS_SET_C_LD_FLAGS([target],[CONF_CC_OPTS_STAGE2],[CONF_GCC_LINKER_OPTS_STAGE2],[CONF_LD_LINKER_OPTS_STAGE2],[CONF_CPP_OPTS_STAGE2])
# Stage 3 won't be supported by cross-compilation

# See rules/distdir-way-opts.mk for details.
# Flags passed to the C compiler
AC_SUBST(CONF_CC_OPTS_STAGE0)
AC_SUBST(CONF_CC_OPTS_STAGE1)
AC_SUBST(CONF_CC_OPTS_STAGE2)
# Flags passed to the C compiler when we ask it to link
AC_SUBST(CONF_GCC_LINKER_OPTS_STAGE0)
AC_SUBST(CONF_GCC_LINKER_OPTS_STAGE1)
AC_SUBST(CONF_GCC_LINKER_OPTS_STAGE2)
# Flags passed to the linker when we ask it to link
AC_SUBST(CONF_LD_LINKER_OPTS_STAGE0)
AC_SUBST(CONF_LD_LINKER_OPTS_STAGE1)
AC_SUBST(CONF_LD_LINKER_OPTS_STAGE2)
# Flags passed to the C preprocessor
AC_SUBST(CONF_CPP_OPTS_STAGE0)
AC_SUBST(CONF_CPP_OPTS_STAGE1)
AC_SUBST(CONF_CPP_OPTS_STAGE2)
# Flags passed to the Haskell compiler
AC_SUBST(CONF_HC_OPTS_STAGE0)
AC_SUBST(CONF_HC_OPTS_STAGE1)
AC_SUBST(CONF_HC_OPTS_STAGE2)

dnl ** Set up the variables for the platform in the settings file.
dnl May need to use gcc to find platform details.
dnl --------------------------------------------------------------
FPTOOLS_SET_HASKELL_PLATFORM_VARS

dnl ** figure out how to do context diffs
FP_PROG_CONTEXT_DIFF

dnl Let's make sure install-sh is executable here.  If we got it from
dnl a darcs repo, it might not be (see bug #978).
chmod +x install-sh
dnl ** figure out how to do a BSD-ish install
AC_PROG_INSTALL

dnl ** how to invoke `ar' and `ranlib'
FP_PROG_AR_SUPPORTS_ATFILE
FP_PROG_AR_NEEDS_RANLIB

dnl ** Check to see whether ln -s works
AC_PROG_LN_S

FP_SETTINGS

dnl ** Find the path to sed
AC_PATH_PROGS(SedCmd,gsed sed,sed)


dnl ** check for time command
AC_PATH_PROG(TimeCmd,time)

dnl ** check for tar
dnl   if GNU tar is named gtar, look for it first.
AC_PATH_PROGS(TarCmd,gnutar gtar tar,tar)

dnl ** check for compressors
AC_PATH_PROGS(Bzip2Cmd,bzip2, bzip2)
AC_PATH_PROGS(GzipCmd,gzip, gzip)
AC_PATH_PROGS(XzCmd,pxz xz, xz)

dnl ** check for patch
dnl if GNU patch is named gpatch, look for it first
AC_PATH_PROGS(PatchCmd,gpatch patch, patch)

dnl ** check for autoreconf
AC_PATH_PROG(AutoreconfCmd, autoreconf, autoreconf)

dnl ** check for dtrace (currently only implemented for Mac OS X)
AC_ARG_ENABLE(dtrace,
    [AC_HELP_STRING([--enable-dtrace],
        [Enable DTrace])],
    EnableDtrace=$enableval,
    EnableDtrace=yes
)

HaveDtrace=NO

AC_PATH_PROG(DtraceCmd,dtrace)
if test "x$EnableDtrace" = "xyes"; then
  if test -n "$DtraceCmd"; then
    if test "x$TargetOS_CPP-$TargetVendor_CPP" = "xdarwin-apple" \
      -o "x$TargetOS_CPP-$TargetVendor_CPP" = "xfreebsd-portbld" \
      -o "x$TargetOS_CPP-$TargetVendor_CPP" = "xsolaris2-unknown"; then
      HaveDtrace=YES
    fi
  fi
fi
AC_SUBST(HaveDtrace)

AC_PATH_PROG(HSCOLOUR,HsColour)
# HsColour is passed to Cabal, so we need a native path
if test "$HostOS"      = "mingw32" && \
   test "${OSTYPE}"   != "msys"    && \
   test "${HSCOLOUR}" != ""
then
    # Canonicalise to <drive>:/path/to/gcc
    HSCOLOUR=`cygpath -m ${HSCOLOUR}`
fi

dnl ** check for Sphinx toolchain
AC_PATH_PROG(SPHINXBUILD,sphinx-build)
AC_CACHE_CHECK([for version of sphinx-build], fp_cv_sphinx_version,
changequote(, )dnl
[if test -n "$SPHINXBUILD"; then
  fp_cv_sphinx_version=`"$SPHINXBUILD" --version 2>&1 | sed 's/.* v\?\([0-9]\.[0-9]\.[0-9]\)/\1/' | head -n1`;
fi;
changequote([, ])dnl
])
FP_COMPARE_VERSIONS([$fp_cv_sphinx_version],-lt,1.0.0,
    [AC_MSG_WARN([Sphinx version 1.0.0 or later is required to build documentation]); SPHINXBUILD=;])

dnl ** check for xelatex
AC_PATH_PROG(XELATEX,xelatex)

dnl ** check for makeinfo
AC_PATH_PROG(MAKEINFO,makeinfo)

dnl ** check for ghc-pkg command
FP_PROG_GHC_PKG

dnl ** check for installed happy binary + version

AC_ARG_VAR(HAPPY,[Use as the path to happy [default=autodetect]])
FPTOOLS_HAPPY

dnl ** check for installed alex binary + version

AC_ARG_VAR(ALEX,[Use as the path to alex [default=autodetect]])
FPTOOLS_ALEX

dnl --------------------------------------------------
dnl ### program checking section ends here ###
dnl --------------------------------------------------

dnl --------------------------------------------------
dnl * Platform header file and syscall feature tests
dnl ### checking the state of the local header files and syscalls ###

dnl ** check for full ANSI header (.h) files
AC_HEADER_STDC

dnl ** Enable large file support.  NB. do this before testing the type of
dnl    off_t, because it will affect the result of that test.
AC_SYS_LARGEFILE

dnl ** check for specific header (.h) files that we are interested in
AC_CHECK_HEADERS([ctype.h dirent.h dlfcn.h errno.h fcntl.h grp.h limits.h locale.h nlist.h pthread.h pwd.h signal.h sys/param.h sys/mman.h sys/resource.h sys/select.h sys/time.h sys/timeb.h sys/timerfd.h sys/timers.h sys/times.h sys/utsname.h sys/wait.h termios.h time.h utime.h windows.h winsock.h sched.h])

dnl sys/cpuset.h needs sys/param.h to be included first on FreeBSD 9.1; #7708
AC_CHECK_HEADERS([sys/cpuset.h], [], [],
[[#if HAVE_SYS_PARAM_H
# include <sys/param.h>
#endif
]])

dnl ** check if it is safe to include both <time.h> and <sys/time.h>
AC_HEADER_TIME

dnl ** do we have long longs?
AC_CHECK_TYPES([long long])

dnl ** what are the sizes of various types
FP_CHECK_SIZEOF_AND_ALIGNMENT(char)
FP_CHECK_SIZEOF_AND_ALIGNMENT(double)
FP_CHECK_SIZEOF_AND_ALIGNMENT(float)
FP_CHECK_SIZEOF_AND_ALIGNMENT(int)
FP_CHECK_SIZEOF_AND_ALIGNMENT(long)
if test "$ac_cv_type_long_long" = yes; then
FP_CHECK_SIZEOF_AND_ALIGNMENT(long long)
fi
FP_CHECK_SIZEOF_AND_ALIGNMENT(short)
FP_CHECK_SIZEOF_AND_ALIGNMENT(unsigned char)
FP_CHECK_SIZEOF_AND_ALIGNMENT(unsigned int)
FP_CHECK_SIZEOF_AND_ALIGNMENT(unsigned long)
if test "$ac_cv_type_long_long" = yes; then
FP_CHECK_SIZEOF_AND_ALIGNMENT(unsigned long long)
fi
FP_CHECK_SIZEOF_AND_ALIGNMENT(unsigned short)
FP_CHECK_SIZEOF_AND_ALIGNMENT(void *)

FP_CHECK_SIZEOF_AND_ALIGNMENT(int8_t)
FP_CHECK_SIZEOF_AND_ALIGNMENT(uint8_t)
FP_CHECK_SIZEOF_AND_ALIGNMENT(int16_t)
FP_CHECK_SIZEOF_AND_ALIGNMENT(uint16_t)
FP_CHECK_SIZEOF_AND_ALIGNMENT(int32_t)
FP_CHECK_SIZEOF_AND_ALIGNMENT(uint32_t)
FP_CHECK_SIZEOF_AND_ALIGNMENT(int64_t)
FP_CHECK_SIZEOF_AND_ALIGNMENT(uint64_t)


dnl for use in settings file
TargetWordSize=$ac_cv_sizeof_void_p
if test "x$TargetWordSize" == 8; then
  AC_SUBST([Cabal64bit],[True])
else
  AC_SUBST([Cabal64bit],[False])
fi
AC_SUBST(TargetWordSize)
FP_CHECK_FUNC([WinExec],
  [@%:@include <windows.h>], [WinExec("",0)])

FP_CHECK_FUNC([GetModuleFileName],
  [@%:@include <windows.h>], [GetModuleFileName((HMODULE)0,(LPTSTR)0,0)])

dnl ** check for more functions
dnl ** The following have been verified to be used in ghc/, but might be used somewhere else, too.
AC_CHECK_FUNCS([getclock getrusage gettimeofday setitimer siginterrupt sysconf times ctime_r sched_setaffinity setlocale])

dnl ** On OS X 10.4 (at least), time.h doesn't declare ctime_r if
dnl ** _POSIX_C_SOURCE is defined
AC_CHECK_DECLS([ctime_r], , ,
[#define _POSIX_SOURCE 1
#define _POSIX_C_SOURCE 199506L
#include <time.h>])

dnl ** check for mingwex library
AC_CHECK_LIB(
  [mingwex],
  [closedir],
  [AC_SUBST([HaveLibMingwEx],[YES])] [AC_SUBST([CabalMingwex],[True])],
  [AC_SUBST([HaveLibMingwEx],[NO])] [AC_SUBST([CabalMingwex],[False])])

if test $HaveLibMingwEx = YES ; then
  AC_DEFINE([HAVE_MINGWEX], [1], [Define to 1 if you have the mingwex library.])
fi

dnl ** check for math library
dnl    Keep that check as early as possible.
dnl    as we need to know whether we need libm
dnl    for math functions or not
dnl    (see https://gitlab.haskell.org/ghc/ghc/issues/3730)
AC_CHECK_LIB(m, atan, HaveLibM=YES, HaveLibM=NO)
if test $HaveLibM = YES
then
  AC_DEFINE([HAVE_LIBM], [1], [Define to 1 if you need to link with libm])
  AC_SUBST([CabalHaveLibm],[True])
else
  AC_SUBST([CabalHaveLibm],[False])
fi

FP_BFD_SUPPORT

dnl ################################################################
dnl Check for libraries
dnl ################################################################

# system libffi

AC_ARG_WITH([system-libffi],
[AC_HELP_STRING([--with-system-libffi],
  [Use system provided libffi for RTS [default=no]])
])

AS_IF([test "x$with_system_libffi" = "xyes"],
  [UseSystemLibFFI="YES"], [UseSystemLibFFI="NO"]
)


AC_SUBST(UseSystemLibFFI)

AC_ARG_WITH([ffi-includes],
[AC_HELP_STRING([--with-ffi-includes=ARG],
  [Find includes for libffi in ARG [default=system default]])
],
[
 if test "x$UseSystemLibFFI" != "xYES"; then
    AC_MSG_WARN([--with-ffi-includes will be ignored, --with-system-libffi not set])
 else
    FFIIncludeDir="$withval"
    LIBFFI_CFLAGS="-I$withval"
 fi
])

AC_SUBST(FFIIncludeDir)

AC_ARG_WITH([ffi-libraries],
[AC_HELP_STRING([--with-ffi-libraries=ARG],
  [Find libffi in ARG [default=system default]])
],
[
 if test "x$UseSystemLibFFI" != "xYES"; then
    AC_MSG_WARN([--with-ffi-libraries will be ignored, --with-system-libffi not set])
 else
    FFILibDir="$withval" LIBFFI_LDFLAGS="-L$withval"
 fi
])

AC_SUBST(FFILibDir)

AC_SUBST([CabalHaveLibffi],[False])
AS_IF([test "$UseSystemLibFFI" = "YES"], [
 CFLAGS2="$CFLAGS"
 CFLAGS="$LIBFFI_CFLAGS $CFLAGS"
 LDFLAGS2="$LDFLAGS"
 LDFLAGS="$LIBFFI_LDFLAGS $LDFLAGS"
 if test "$HostOS" = "openbsd";
 then
   # OpenBSD's libffi is not directly linked to the libpthread but
   # still requires pthread functionality. This means that any client
   # binary which links with libffi also needs to link with
   # libpthread. If it does not, then linking fails with unresolved
   # symbols.
   LDFLAGS="$LDFLAGS -lpthread"
 fi
 AC_CHECK_LIB(ffi, ffi_call,
  [AC_CHECK_HEADERS([ffi.h], [break], [])
   AC_DEFINE([HAVE_LIBFFI], [1], [Define to 1 if you have libffi.])]
   AC_SUBST([CabalHaveLibffi],[True]),
  [AC_MSG_ERROR([Cannot find system libffi])])
 CFLAGS="$CFLAGS2"
 LDFLAGS="$LDFLAGS2"
])

dnl ** check whether we need -ldl to get dlopen()
AC_CHECK_LIB([dl], [dlopen])
AC_CHECK_LIB([dl], [dlopen], [AC_SUBST([CabalHaveLibdl], [True])], [AC_SUBST([CabalHaveLibdl], [False])])

dnl --------------------------------------------------
dnl * Miscellaneous feature tests
dnl --------------------------------------------------

dnl ** can we get alloca?
AC_FUNC_ALLOCA

dnl ** working vfork?
AC_FUNC_FORK

dnl ** determine whether or not const works
AC_C_CONST

dnl ** are we big endian?
AC_C_BIGENDIAN
FPTOOLS_FLOAT_WORD_ORDER_BIGENDIAN

dnl ** check for leading underscores in symbol names
FP_LEADING_UNDERSCORE

FP_VISIBILITY_HIDDEN

dnl ** check for librt
AC_CHECK_LIB([rt], [clock_gettime])
AC_CHECK_LIB([rt], [clock_gettime], [AC_SUBST([CabalHaveLibrt], [True])], [AC_SUBST([CabalHaveLibrt], [False])])
AC_CHECK_FUNCS(clock_gettime timer_settime)
FP_CHECK_TIMER_CREATE

dnl ** check for Apple's "interesting" long double compatibility scheme
AC_MSG_CHECKING(for printf\$LDBLStub)
AC_TRY_LINK_FUNC(printf\$LDBLStub,
    [
        AC_MSG_RESULT(yes)
        AC_DEFINE([HAVE_PRINTF_LDBLSTUB],[1],
            [Define to 1 if we have printf$LDBLStub (Apple Mac OS >= 10.4, PPC).])
    ],
    [
        AC_MSG_RESULT(no)
        AC_DEFINE([HAVE_PRINTF_LDBLSTUB],[0],
            [Define to 1 if we have printf$LDBLStub (Apple Mac OS >= 10.4, PPC).])
    ])

dnl Some platforms (e.g. Android's Bionic) have pthreads support available
dnl without linking against libpthread. Check whether -lpthread is necessary
dnl to use pthreads.
dnl
dnl Note that it is important that this happens before we AC_CHECK_LIB(thread)
AC_MSG_CHECKING(whether -lpthread is needed for pthreads)
AC_CHECK_FUNC(pthread_create,
    [
        AC_MSG_RESULT(no)
        AC_SUBST([CabalNeedLibpthread],[False])
        need_lpthread=0
    ],
    [
        AC_CHECK_LIB(pthread, pthread_create,
            [
                AC_MSG_RESULT(yes)
                AC_SUBST([CabalNeedLibpthread],[True])
                need_lpthread=1
            ],
            [
                AC_SUBST([CabalNeedLibpthread],[False])
                AC_MSG_RESULT([no pthreads support found.])
                need_lpthread=0
            ])
    ])
AC_DEFINE_UNQUOTED([NEED_PTHREAD_LIB], [$need_lpthread],
    [Define 1 if we need to link code using pthreads with -lpthread])

dnl ** pthread_setname_np is a recent addition to glibc, and OS X has
dnl    a different single-argument version.
AC_CHECK_LIB(pthread, pthread_setname_np)
AC_MSG_CHECKING(for pthread_setname_np)
AC_TRY_LINK(
[
#define _GNU_SOURCE
#include <pthread.h>
],
[pthread_setname_np(pthread_self(), "name");],
    AC_MSG_RESULT(yes)
    AC_DEFINE([HAVE_PTHREAD_SETNAME_NP], [1],
      [Define to 1 if you have the glibc version of pthread_setname_np]),
    AC_MSG_RESULT(no)
)

dnl ** check for eventfd which is needed by the I/O manager
AC_CHECK_HEADERS([sys/eventfd.h])
AC_CHECK_FUNCS([eventfd])

dnl ** Check for __thread support in the compiler
AC_MSG_CHECKING(for __thread support)
AC_COMPILE_IFELSE(
  [ AC_LANG_SOURCE([[__thread int tester = 0;]]) ],
  [
   AC_MSG_RESULT(yes)
   AC_DEFINE([CC_SUPPORTS_TLS],[1],[Define to 1 if __thread is supported])
  ],
  [
   AC_MSG_RESULT(no)
   AC_DEFINE([CC_SUPPORTS_TLS],[0],[Define to 1 if __thread is supported])
  ])

dnl large address space support (see includes/rts/storage/MBlock.h)
dnl
dnl Darwin has vm_allocate/vm_protect
dnl Linux has mmap(MAP_NORESERVE)/madv(MADV_DONTNEED)
dnl FreeBSD, Solaris and maybe other have MAP_NORESERVE/MADV_FREE
dnl (They also have MADV_DONTNEED, but it means something else!)
dnl
dnl Windows has VirtualAlloc MEM_RESERVE/MEM_COMMIT, however
dnl it counts page-table space as committed memory, and so quickly
dnl runs out of paging file when we have multiple processes reserving
dnl 1TB of address space, we get the following error:
dnl    VirtualAlloc MEM_RESERVE 1099512676352 bytes failed: The paging file is too small for this operation to complete.
dnl

AC_ARG_ENABLE(large-address-space,
    [AC_HELP_STRING([--enable-large-address-space],
        [Use a single large address space on 64 bit systems (enabled by default on 64 bit platforms)])],
    EnableLargeAddressSpace=$enableval,
    EnableLargeAddressSpace=yes
)

use_large_address_space=no
if test "$ac_cv_sizeof_void_p" -eq 8 ; then
    if test "x$EnableLargeAddressSpace" = "xyes" ; then
        if test "$ghc_host_os" = "darwin" ; then
            use_large_address_space=yes
	elif test "$ghc_host_os" = "openbsd" ; then
	    # as of OpenBSD 5.8 (2015), OpenBSD does not support mmap with MAP_NORESERVE.
	    # The flag MAP_NORESERVE is supported for source compatibility reasons,
	    # but is completely ignored by OS mmap
            use_large_address_space=no
        else
            AC_CHECK_DECLS([MAP_NORESERVE, MADV_FREE, MADV_DONTNEED],[],[],
                [
                #include <unistd.h>
                #include <sys/types.h>
                #include <sys/mman.h>
                #include <fcntl.h>
            ])
            if test "$ac_cv_have_decl_MAP_NORESERVE" = "yes" &&
                test "$ac_cv_have_decl_MADV_FREE" = "yes" ||
                test "$ac_cv_have_decl_MADV_DONTNEED" = "yes" ; then
                    use_large_address_space=yes
            fi
        fi
    fi
fi
if test "$use_large_address_space" = "yes" ; then
   AC_DEFINE([USE_LARGE_ADDRESS_SPACE], [1], [Enable single heap address space support])
fi

dnl ** Use MMAP in the runtime linker?
dnl --------------------------------------------------------------

case ${TargetOS} in
    linux|linux-android|freebsd|dragonfly|netbsd|openbsd|kfreebsdgnu|gnu|solaris2)
        RtsLinkerUseMmap=1
        ;;
    darwin|ios|watchos|tvos)
        RtsLinkerUseMmap=1
        ;;
    *)
        # Windows (which doesn't have mmap) and everything else.
        RtsLinkerUseMmap=0
        ;;
    esac

AC_DEFINE_UNQUOTED([RTS_LINKER_USE_MMAP], [$RtsLinkerUseMmap],
                   [Use mmap in the runtime linker])

dnl ** Have libdw?
dnl --------------------------------------------------------------
UseLibdw=NO
USE_LIBDW=0
AC_ARG_ENABLE(dwarf-unwind,
    [AC_HELP_STRING([--enable-dwarf-unwind],
        [Enable DWARF unwinding support in the runtime system via elfutils' libdw [default=no]])])
if test "$enable_dwarf_unwind" = "yes" ; then
  AC_CHECK_LIB(dw, dwfl_attach_state,
      [UseLibdw=YES],
      [AC_MSG_ERROR([Cannot find system libdw (required by --enable-dwarf-unwind)])])
fi

AC_SUBST(UseLibdw)
if test $UseLibdw = "YES" ; then
	USE_LIBDW=1
  AC_SUBST([CabalHaveLibdw],[True])
else
  AC_SUBST([CabalHaveLibdw],[False])
fi
AC_DEFINE_UNQUOTED([USE_LIBDW], [$USE_LIBDW], [Set to 1 to use libdw])

dnl ** Have libnuma?
dnl --------------------------------------------------------------
HaveLibNuma=0
AC_ARG_ENABLE(numa,
    [AC_HELP_STRING([--enable-numa],
        [Enable NUMA memory policy and thread affinity support in the
         runtime system via numactl's libnuma [default=auto]])])

if test "$enable_numa" != "no" ; then
  AC_CHECK_HEADERS([numa.h numaif.h])

  if test "$ac_cv_header_numa_h$ac_cv_header_numaif_h" = "yesyes" ; then
    AC_CHECK_LIB(numa, numa_available,HaveLibNuma=1)
  fi
  if test "$enable_numa:$HaveLibNuma" = "yes:0" ; then
      AC_MSG_ERROR([Cannot find system libnuma (required by --enable-numa)])]
  fi
fi

AC_DEFINE_UNQUOTED([HAVE_LIBNUMA], [$HaveLibNuma], [Define to 1 if you have libnuma])
if test $HaveLibNuma = "1" ; then
  AC_SUBST([CabalHaveLibNuma],[True])
else
  AC_SUBST([CabalHaveLibNuma],[False])
fi


dnl ** Documentation
dnl --------------------------------------------------------------
if test -n "$SPHINXBUILD"; then
    BUILD_MAN=YES
    BUILD_SPHINX_HTML=YES
    if test -n "$XELATEX"; then
        BUILD_SPHINX_PDF=YES
    else
        BUILD_SPHINX_PDF=NO
    fi
    if test -n "$MAKEINFO"; then
        BUILD_SPHINX_INFO=YES
    else
        BUILD_SPHINX_INFO=NO
    fi
else
    BUILD_MAN=NO
    BUILD_SPHINX_HTML=NO
    BUILD_SPHINX_PDF=NO
    BUILD_SPHINX_INFO=NO
fi
AC_SUBST(BUILD_MAN)
AC_SUBST(BUILD_SPHINX_HTML)
AC_SUBST(BUILD_SPHINX_PDF)

dnl ** Determine library versions
dnl The packages below should include all packages needed by
dnl doc/users_guide/ghc_config.py.in.
LIBRARY_VERSION(base)
LIBRARY_VERSION(Cabal, Cabal/Cabal)
LIBRARY_VERSION(template-haskell)
LIBRARY_VERSION(parallel)
LIBRARY_VERSION(array)
LIBRARY_VERSION(ghc-prim)
LIBRARY_VERSION(ghc-compact)
LIBRARY_ghc_VERSION="$ProjectVersion"
AC_SUBST(LIBRARY_ghc_VERSION)

if grep '	' compiler/ghc.cabal.in 2>&1 >/dev/null; then
   AC_MSG_ERROR([compiler/ghc.cabal.in contains tab characters; please remove them])
fi

# Create the configuration for the Hadrian build system if it is present
if test -e hadrian/cfg/system.config.in; then
    AC_CONFIG_FILES([hadrian/cfg/system.config])
fi

# We got caught by
#     http://savannah.gnu.org/bugs/index.php?1516
#     $(eval ...) inside conditionals causes errors
# with make 3.80, so warn the user if it looks like they're about to
# try to use it.
# We would use "grep -q" here, but Solaris's grep doesn't support it.
print_make_warning=""
checkMake380() {
    make_ver=`$1 --version 2>&1 | head -1`
    if echo "$make_ver" | grep 'GNU Make 3\.80' > /dev/null
    then
        print_make_warning="true"
    fi
    if echo "$make_ver" | grep 'GNU Make' > /dev/null
    then
        MakeCmd=$1
        AC_SUBST(MakeCmd)
    fi
}

checkMake380 make
checkMake380 gmake

AC_CONFIG_FILES([mk/config.mk mk/install.mk mk/project.mk rts/rts.cabal compiler/ghc.cabal ghc/ghc-bin.cabal utils/iserv/iserv.cabal utils/iserv-proxy/iserv-proxy.cabal utils/remote-iserv/remote-iserv.cabal utils/runghc/runghc.cabal utils/gen-dll/gen-dll.cabal libraries/ghc-boot/ghc-boot.cabal libraries/ghc-boot-th/ghc-boot-th.cabal libraries/ghci/ghci.cabal libraries/ghc-heap/ghc-heap.cabal libraries/libiserv/libiserv.cabal libraries/template-haskell/template-haskell.cabal docs/users_guide/ghc_config.py docs/index.html libraries/prologue.txt distrib/configure.ac])
AC_OUTPUT
[
if test "$print_make_warning" = "true"; then
   echo
   echo "WARNING: It looks like \"$MakeCmd\" is GNU make 3.80."
   echo "This version cannot be used to build GHC."
   echo "Please use GNU make >= 3.81."
fi

echo "
----------------------------------------------------------------------
Configure completed successfully.

   Building GHC version  : $ProjectVersion
          Git commit id  : $ProjectGitCommitId

   Build platform        : $BuildPlatform
   Host platform         : $HostPlatform
   Target platform       : $TargetPlatform
"

echo "\
   Bootstrapping using   : $WithGhc
      which is version   : $GhcVersion
"

if test "x$CC_LLVM_BACKEND" = "x1"; then
    CompilerName="clang        "
else
    CompilerName="gcc          "
fi

echo "\
   Using (for bootstrapping) : $CC_STAGE0
   Using $CompilerName       : $CC
      which is version       : $GccVersion
   Building a cross compiler : $CrossCompiling
   Unregisterised            : $Unregisterised
   TablesNextToCode          : $TablesNextToCode
   hs-cpp       : $HaskellCPPCmd
   hs-cpp-flags : $HaskellCPPArgs
   ar           : $ArCmd
   ld           : $LdCmd
   nm           : $NmCmd
   libtool      : $LibtoolCmd
   objdump      : $ObjdumpCmd
   ranlib       : $RanlibCmd
   windres      : $WindresCmd
   dllwrap      : $DllWrapCmd
   genlib       : $GenlibCmd
   Happy        : $HappyCmd ($HappyVersion)
   Alex         : $AlexCmd ($AlexVersion)
   sphinx-build : $SPHINXBUILD
   xelatex      : $XELATEX
   makeinfo     : $MAKEINFO

   Using LLVM tools
      clang : $ClangCmd
      llc   : $LlcCmd
      opt   : $OptCmd"

if test "$HSCOLOUR" = ""; then
echo "
   HsColour was not found; documentation will not contain source links
"
else
echo "\
   HsColour : $HSCOLOUR
"
fi

echo "\
   Tools to build Sphinx HTML documentation available: $BUILD_SPHINX_HTML
   Tools to build Sphinx PDF documentation available: $BUILD_SPHINX_PDF
   Tools to build Sphinx INFO documentation available: $BUILD_SPHINX_INFO"

echo "----------------------------------------------------------------------
"

echo "\
For a standard build of GHC (fully optimised with profiling), type (g)make.

To make changes to the default build configuration, copy the file
mk/build.mk.sample to mk/build.mk, and edit the settings in there.

For more information on how to configure your GHC build, see
   https://gitlab.haskell.org/ghc/ghc/wikis/building
"]