Fontconfig 2.12.91 compilation error on MingW

Hello,

I've read https://lists.freedesktop.org/archives/fontconfig/2017-December/006107.html, but my issue is different.

I'm compiling Fontconfig with the help of forked script of https://github.com/rdp/ffmpeg-windows-build-helpers (which uses Cygwin, MingW, GCC) to build FFmpeg in the end.
I've just released another FFmpeg build, but still with Fontconfig 2.12.6, because I got a compilation error with v2.12.91.

Let me first say that I only compile what's really necessary:

build_fontconfig() {
  download_and_unpack_file https://www.freedesktop.org/software/fontconfig/release/fontconfig-2.12.91.tar.bz2
  cd fontconfig-2.12.91
    if [[ ! -f Makefile.in.bak ]]; then # Library only.
      sed -i.bak "/^SUBDIRS/s/fc.*/src/;464,465d;/^install-data-am/s/:.*/: install-pkgconfigDATA/;/\tinstall-xmlDATA$/d" Makefile.in
    fi
    export UUID_CFLAGS="-I/usr/include"
    export UUID_LIBS="-luuid" # 'configure' somehow only looks at '$PKG_CONFIG --exists --print-errors "uuid"'.
    generic_configure "--enable-iconv --enable-libxml2 --disable-docs --with-libiconv" # Use Libxml2 instead of Expat.
    do_make_and_make_install
    unset UUID_CFLAGS
    unset UUID_LIBS
  cd ..
} # freetype, libxml >= 2.6, itstool (cygwin), [iconv, dlfcn]

- I'm leaving out all the '/fc-*/'-dirs and I'm only compiling SUBDIRS = fontconfig src. This way I'm not even getting the '/fc-cache.exe/'-error, but I might if I would build normally, I don't know.
- I had to install Cygwin's "itstool". Apparently that has become a prerequisite with this latest version.
- Another prerequisite seems to be libuuid. Cygwin already installed it for me, but Fontconfig's '/configure/' doesn't search for it.

Then the compilation error, beginning at '/src/fcatomic.c/':

[...]
  CC       fcatomic.lo
In file included from /usr/include/errno.h:9:0,
                 from fcint.h:39,
                 from fcatomic.c:50:
/usr/include/sys/errno.h:14:0: warning: "errno" redefined
 #define errno (*__errno())

In file included from /cygdrive/m/ffmpeg-windows-build-helpers-master/native_build/windows/ffmpeg_local_builds/sandbox/cross_compilers/mingw-w64-i686/lib/gcc/i686-w64-mingw32/7.2.0/include/stddef.h:1:0,
                 from /usr/include/stdlib.h:16,
                 from fcint.h:34,
                 from fcatomic.c:50:
/cygdrive/m/ffmpeg-windows-build-helpers-master/native_build/windows/ffmpeg_local_builds/sandbox/cross_compilers/mingw-w64-i686/i686-w64-mingw32/include/stddef.h:19:0: note: this is the location of the previous definition
 #define errno (*_errno())

In file included from fcint.h:37:0,
                 from fcatomic.c:50:
/usr/include/ctype.h:40:12: error: expected ';', ',' or ')' before numeric constant
 #define _X 0100
            ^
In file included from fcatomic.c:58:0:
/cygdrive/m/ffmpeg-windows-build-helpers-master/native_build/windows/ffmpeg_local_builds/sandbox/cross_compilers/mingw-w64-i686/i686-w64-mingw32/include/direct.h:57:17: error: conflicting types for 'getcwd'
   char *__cdecl getcwd(char *_DstBuf,int _SizeInBytes) __MINGW_ATTRIB_DEPRECATED_MSVC2005;
                 ^~~~~~
In file included from /usr/include/stdlib.h:11:0,
                 from fcint.h:34,
                 from fcatomic.c:50:
/usr/include/sys/unistd.h:96:16: note: previous declaration of 'getcwd' was here
 char *  _EXFUN(getcwd, (char *__buf, size_t __size ));
                ^
/usr/include/_ansi.h:65:30: note: in definition of macro '_EXFUN'
 #define _EXFUN(name, proto)  name proto
                              ^~~~
In file included from fcatomic.c:58:0:
/cygdrive/m/ffmpeg-windows-build-helpers-master/native_build/windows/ffmpeg_local_builds/sandbox/cross_compilers/mingw-w64-i686/i686-w64-mingw32/include/direct.h:59:15: error: conflicting types for 'mkdir'
   int __cdecl mkdir(const char *_Path) __MINGW_ATTRIB_DEPRECATED_MSVC2005;
               ^~~~~
In file included from /usr/include/stdlib.h:11:0,
                 from fcint.h:34,
                 from fcatomic.c:50:
/usr/include/sys/stat.h:150:12: note: previous declaration of 'mkdir' was here
 int _EXFUN(mkdir,( const char *_path, mode_t __mode ));
            ^
/usr/include/_ansi.h:65:30: note: in definition of macro '_EXFUN'
 #define _EXFUN(name, proto)  name proto
                              ^~~~
make[3]: *** [Makefile:667: fcatomic.lo] Error 1
make[3]: Leaving directory '/cygdrive/m/ffmpeg-windows-build-helpers-master/native_build/windows/ffmpeg_local_builds/sandbox/win32/fontconfig-2.12.91/src'
make[2]: *** [Makefile:531: all] Error 2
make[2]: Leaving directory '/cygdrive/m/ffmpeg-windows-build-helpers-master/native_build/windows/ffmpeg_local_builds/sandbox/win32/fontconfig-2.12.91/src'
make[1]: *** [Makefile:605: all-recursive] Error 1
make[1]: Leaving directory '/cygdrive/m/ffmpeg-windows-build-helpers-master/native_build/windows/ffmpeg_local_builds/sandbox/win32/fontconfig-2.12.91'
make: *** [Makefile:489: all] Error 2

And that's the reason why I stick to v2.12.6 for the moment. I hope this helps.

-- Reino

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