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authorJoseph Myers <joseph@codesourcery.com>2013-11-04 15:43:57 +0000
committerJoseph Myers <joseph@codesourcery.com>2013-11-04 15:43:57 +0000
commit1484e65736f4cab27e5051e0f06be8470e69af82 (patch)
tree2661e8c53b60acf5d5685e2402b2e94cdeb8c649 /include
parentcd3e2ac55e6848bc725a20978a4c2a7ab766bd86 (diff)
downloadglibc-1484e65736f4cab27e5051e0f06be8470e69af82.tar.gz
Define __STDC_IEC_559* based on __GCC_IEC_559*.
Diffstat (limited to 'include')
-rw-r--r--include/stdc-predef.h25
1 files changed, 22 insertions, 3 deletions
diff --git a/include/stdc-predef.h b/include/stdc-predef.h
index b9c9967d9d..f8cb2cb97a 100644
--- a/include/stdc-predef.h
+++ b/include/stdc-predef.h
@@ -26,9 +26,28 @@
explicitly includes a system header. GCC knows the name of this
header in order to preinclude it. */
-/* We do support the IEC 559 math functionality, real and complex. */
-#define __STDC_IEC_559__ 1
-#define __STDC_IEC_559_COMPLEX__ 1
+/* glibc's intent is to support the IEC 559 math functionality, real
+ and complex. If the GCC (4.9 and later) predefined macros
+ specifying compiler intent are available, use them to determine
+ whether the overall intent is to support these features; otherwise,
+ presume an older compiler has intent to support these features and
+ define these macros by default. */
+
+#ifdef __GCC_IEC_559
+# if __GCC_IEC_559 > 0
+# define __STDC_IEC_559__ 1
+# endif
+#else
+# define __STDC_IEC_559__ 1
+#endif
+
+#ifdef __GCC_IEC_559_COMPLEX
+# if __GCC_IEC_559_COMPLEX > 0
+# define __STDC_IEC_559_COMPLEX__ 1
+# endif
+#else
+# define __STDC_IEC_559_COMPLEX__ 1
+#endif
/* wchar_t uses ISO/IEC 10646 (2nd ed., published 2011-03-15) /
Unicode 6.0. */