build: Add -D_XOPEN_SOURCE=600 to CPPFLAGS on Cygwin

This is required to make certain math defines visible on modern Cygwin.
8 years ago · f8a1ead0ae
parent 39fbcf8f76
commit f8a1ead0ae
1 changed files with 1 additions and 1 deletions
--- a/2
+++ b/2
@ -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