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build: Add -D_XOPEN_SOURCE=600 to CPPFLAGS on Cygwin 

This is required to make certain math defines visible on modern Cygwin.
This commit is contained in:
Diego Biurrun 2016-12-09 15:45:05 +01:00
parent 39fbcf8f76
commit f8a1ead0ae
1 changed files with 1 additions and 1 deletions
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2
configure vendored
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@ -4017,7 +4017,7 @@ probe_libc(){
# MinGW headers can be installed on Cygwin, so check for newlib first.
elif check_${pfx}cpp_condition newlib.h "defined _NEWLIB_VERSION"; then
eval ${pfx}libc_type=newlib
add_${pfx}cppflags -U__STRICT_ANSI__
add_${pfx}cppflags -U__STRICT_ANSI__ -D_XOPEN_SOURCE=600
# MinGW64 is backwards compatible with MinGW32, so check for it first.
elif check_${pfx}cpp_condition _mingw.h "defined __MINGW64_VERSION_MAJOR"; then
eval ${pfx}libc_type=mingw64