swscale: Do not expand a macro with 'defined' in it

Fixes: libswscale/utils.c:1632:5: warning: macro expansion producing 'defined' has undefined behavior [-Wexpansion-to-defined] #if USE_MMAP ^ libswscale/utils.c:1577:49: note: expanded from macro 'USE_MMAP' #define USE_MMAP (HAVE_MMAP && HAVE_MPROTECT && defined MAP_ANONYMOUS) ^ Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com> Signed-off-by: Luca Barbato <lu_zero@gentoo.org>
danimo · Aug 28, 2017 · 5e3f6dc · 5e3f6dc
1 parent 29ba1e6
commit 5e3f6dc
Showing 1 changed file with 5 additions and 1 deletion.
diff --git a/libswscale/utils.c b/libswscale/utils.c
@@ -1098,7 +1098,11 @@ av_cold int sws_init_context(SwsContext *c, SwsFilter *srcFilter,
         }
     }
 
-#define USE_MMAP (HAVE_MMAP && HAVE_MPROTECT && defined MAP_ANONYMOUS)
+#if HAVE_MMAP && HAVE_MPROTECT && defined(MAP_ANONYMOUS)
+#define USE_MMAP 1
+#else
+#define USE_MMAP 0
+#endif
 
     /* precalculate horizontal scaler filter coefficients */
     {