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Compilation on MSYS2/MinGW-w64 fails with error: "__USE_MINGW_ANSI_STDIO" redefined
Compilation against latest GIT version fails at the following step:
CC qga/commands.o
In file included from qga/commands.c:13:
C:/Tempy-chan/qemu/include/qemu/osdep.h:97: error: "__USE_MINGW_ANSI_STDIO" redefined [-Werror]
#define __USE_MINGW_ANSI_STDIO 1
In file included from C:/msys64/mingw64/x86_64-w64-mingw32/include/vadefs.h:9,
from C:/msys64/mingw64/x86_64-w64-mingw32/include/_mingw_stdarg.h:14,
from C:/msys64/mingw64/x86_64-w64-mingw32/include/stdarg.h:140,
from C:/msys64/mingw64/lib/gcc/x86_64-w64-mingw32/8.3.0/include/stdarg.h:1,
from C:/Tempy-chan/qemu/include/qemu/osdep.h:88,
from qga/commands.c:13:
C:/msys64/mingw64/x86_64-w64-mingw32/include/_mingw.h:431: note: this is the location of the previous definition
#define __USE_MINGW_ANSI_STDIO 0 /* was not defined so it should be 0 */
cc1.exe: all warnings being treated as errors
make: *** [/c/Tempy-chan/qemu/rules.mak:69: qga/commands.o] Error 1
Passing --extra-cflags="-D__USE_MINGW_ANSI_STDIO" to configure resolves the error. Digging deeper in x86_64-w64-mingw32/include/_mingw.h, it looks like __USE_MINGW_ANSI_STDIO is only defined for _GNU_SOURCE in C++ compilation. With C only code it's ignored and doesn't define __USE_MINGW_ANSI_STDIO as expected:
/* We are activating __USE_MINGW_ANSI_STDIO for various define indicators.
Note that we enable it also for _GNU_SOURCE in C++, but not for C case. */
#if (defined (_POSIX) || defined (_POSIX_SOURCE) || defined (_POSIX_C_SOURCE) \
|| defined (_ISOC99_SOURCE) \
|| defined (_XOPEN_SOURCE) || defined (_XOPEN_SOURCE_EXTENDED) \
|| (defined (_GNU_SOURCE) && defined (__cplusplus)) \
|| defined (_SVID_SOURCE)) \
&& !defined(__USE_MINGW_ANSI_STDIO)
/* Enable __USE_MINGW_ANSI_STDIO if _POSIX defined
* and If user did _not_ specify it explicitly... */
# define __USE_MINGW_ANSI_STDIO 1
#endif
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