[Emacs-diffs] master d48369d: Fix compilation with MinGW runtime 3.22.2 and w32api 3.18.2

[Eli Zaretskii]

branch: master
commit d48369db9c97b6f2accf702e5bbe0bda11cb92a1
Author: Eli Zaretskii <address@hidden>
Commit: Eli Zaretskii <address@hidden>

    Fix compilation with MinGW runtime 3.22.2 and w32api 3.18.2
    
    * nt/inc/ms-w32.h (_WIN32_WINNT) [!MINGW_W64]: Undefine before
    defining to avoid redefinition warnings.
    
    * nt/inc/sys/stat.h (_SYS_STAT_H, _INC_STAT_H): Define, to avoid
    inclusion of sys/stat.h from the system headers, which could then
    lead to compilation errors due to redefinition of 'struct stat'
    etc.  This is needed because latest versions of MinGW runtime
    include sys/stat.h from wchar.h.
    
    * src/image.c (__MINGW_MAJOR_VERSION) [WINDOWSNT]: Temporarily
    redefine to 4 to avoid conflict between 2 definitions of
    MemoryBarrier.  (Bug#24613)
---
 nt/inc/ms-w32.h   |    1 +
 nt/inc/sys/stat.h |    8 ++++++++
 src/image.c       |   20 ++++++++++++++++++++
 3 files changed, 29 insertions(+)

diff --git a/nt/inc/ms-w32.h b/nt/inc/ms-w32.h
index 8e3a8c2..24076a3 100644
--- a/nt/inc/ms-w32.h
+++ b/nt/inc/ms-w32.h
@@ -146,6 +146,7 @@ extern char *getenv ();
    in its system headers, and is not really compatible with values
    lower than 0x0500, so leave it alone.  */
 #ifndef MINGW_W64
+# undef _WIN32_WINNT
 # define _WIN32_WINNT 0x0400
 #endif
 
diff --git a/nt/inc/sys/stat.h b/nt/inc/sys/stat.h
index 45bc2ea..ea14f07 100644
--- a/nt/inc/sys/stat.h
+++ b/nt/inc/sys/stat.h
@@ -30,6 +30,14 @@ along with GNU Emacs.  If not, see 
<http://www.gnu.org/licenses/>.  */
 # define __MINGW_NOTHROW
 #endif
 
+/* Prevent the MinGW stat.h header from being included, ever.  */
+#ifndef _SYS_STAT_H
+# define _SYS_STAT_H
+#endif
+#ifndef _INC_STAT_H
+# define _INC_STAT_H
+#endif
+
 #include <sys/types.h>
 #include <time.h>
 
diff --git a/src/image.c b/src/image.c
index c3c526d..9bd2455 100644
--- a/src/image.c
+++ b/src/image.c
@@ -9013,10 +9013,30 @@ svg_image_p (Lisp_Object object)
   return fmt[SVG_FILE].count + fmt[SVG_DATA].count == 1;
 }
 
+/* Some versions of glib's gatomic.h define MemoryBarrier, but MinGW
+   w32api 3.18 and later has its own definition.  The following gross
+   hack avoids the clash.  */
+# ifdef WINDOWSNT
+#  if (__W32API_MAJOR_VERSION + (__W32API_MINOR_VERSION >= 18)) >= 4
+#   define W32_SAVE_MINGW_VERSION __MINGW_MAJOR_VERSION
+#   undef __MINGW_MAJOR_VERSION
+#   define __MINGW_MAJOR_VERSION 4
+#  endif
+# endif
+
 # include <librsvg/rsvg.h>
 
 # ifdef WINDOWSNT
 
+/* Restore the original definition of __MINGW_MAJOR_VERSION.  */
+# ifdef W32_SAVE_MINGW_VERSION
+#  undef __MINGW_MAJOR_VERSION
+#  define __MINGW_MAJOR_VERSION W32_SAVE_MINGW_VERSION
+#  ifdef __MINGW_MAJOR_VERSION
+#   undef W32_SAVE_MINGW_VERSION
+#  endif
+# endif
+
 /* SVG library functions.  */
 DEF_DLL_FN (RsvgHandle *, rsvg_handle_new, (void));
 DEF_DLL_FN (void, rsvg_handle_get_dimensions,