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Bug 3476

Summary: round() needs _GNU_SOURCE on some old systems
Product: SDL Reporter: Ozkan Sezer <sezeroz>
Component: videoAssignee: Sam Lantinga <slouken>
Status: RESOLVED FIXED QA Contact: Sam Lantinga <slouken>
Severity: normal    
Priority: P2    
Version: 2.0.5   
Hardware: x86   
OS: Linux   

Description Ozkan Sezer 2016-10-28 19:09:04 UTC 
On systems with old glibc, such mine with glibc-2.8, the following warning
is issued and is fixed easily by defining _GNU_SOURCE:

/home/me/SDL2-2.0.5/src/video/x11/SDL_x11modes.c: In function 'CalculateXRandRRefreshRate':
/home/me/SDL2-2.0.5/src/video/x11/SDL_x11modes.c:263: warning: implicit declaration of function 'round'
/home/me/SDL2-2.0.5/src/video/x11/SDL_x11modes.c:263: warning: incompatible implicit declaration of built-in function 'round'


--- SDL2-2.0.5/src/video/x11/SDL_x11modes.c~
+++ SDL2-2.0.5/src/video/x11/SDL_x11modes.c
@@ -18,6 +18,10 @@
      misrepresented as being the original software.
   3. This notice may not be removed or altered from any source distribution.
 */
+#ifndef _GNU_SOURCE
+#define _GNU_SOURCE
+#endif
+
 #include "../../SDL_internal.h"
 
 #if SDL_VIDEO_DRIVER_X11
Comment 1 Ozkan Sezer 2016-11-04 08:18:11 UTC 
Tested this on new distros too, seen no unwanted effects (as expected.)
Comment 2 Sam Lantinga 2016-11-06 17:30:38 UTC 
Fixed, thanks!
https://hg.libsdl.org/SDL/rev/c8ca00149330