If compiling with 'gcc -std=c++11' for instance, gcc defines
__STRICT_ANSI__ and, thus, the mathematical constants in math.h that are
also defined in POSIX.1 (see
http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/math.h.html for
reference) are undefined, although _POSIX_C_SOURCE or the former
_POSIX_SOURCE is set appropriately.
Adding "defined(_POSIX_C_SOURCE) || defined(_POSIX_SOURCE) || ..." to the
list of guards in math.h:39 fixes the issue. Please see the attached
patch.
Best regards,
Thomas
--- trunk/mingw-w64-headers/crt/math.h 2015-09-10 14:22:26 +0200
+++ trunk/mingw-w64-headers/crt/math.h 2015-09-10 14:29:00 +0200
@@ -36,7 +36,7 @@
#endif
#endif
-#if !defined(__STRICT_ANSI__) || defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) || defined(_BSD_SOURCE) || defined(_USE_MATH_DEFINES)
+#if !defined(__STRICT_ANSI__) || defined(_POSIX_C_SOURCE) || defined(_POSIX_SOURCE) || defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) || defined(_BSD_SOURCE) || defined(_USE_MATH_DEFINES)
#define M_E 2.7182818284590452354
#define M_LOG2E 1.4426950408889634074
#define M_LOG10E 0.43429448190325182765
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