[FFmpeg-devel] [PATCH] utils: Do not expand a macro with 'defined' in it

[Derek Buitenhuis]

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 at gmail.com>
---
 libswscale/utils.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/libswscale/utils.c b/libswscale/utils.c
index b75510d..dcab707 100644
--- a/libswscale/utils.c
+++ b/libswscale/utils.c
@@ -1574,7 +1574,11 @@ 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 */
     {
-- 
1.8.3.1