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Bug 3791

Summary: SDL_bits.h: __builtin_clz is supported in gcc >= 3.4
Product: SDL Reporter: Ozkan Sezer <sezeroz>
Component: *don't know*Assignee: Sam Lantinga <slouken>
Status: RESOLVED FIXED QA Contact: Sam Lantinga <slouken>
Severity: normal    
Priority: P2    
Version: HG 2.0   
Hardware: All   
OS: All   

Description Ozkan Sezer 2017-08-31 17:19:03 UTC 
__builtin_clz is supported in gcc >= 3.4. The following patchlet adjusts
SDL_bits.h for it.

diff --git a/include/SDL_bits.h b/include/SDL_bits.h
--- a/include/SDL_bits.h
+++ b/include/SDL_bits.h
@@ -60,7 +60,7 @@
 SDL_FORCE_INLINE int
 SDL_MostSignificantBitIndex32(Uint32 x)
 {
-#if defined(__GNUC__) && __GNUC__ >= 4
+#if defined(__GNUC__) && (__GNUC__ >= 4 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 4))
     /* Count Leading Zeroes builtin in GCC.
      * http://gcc.gnu.org/onlinedocs/gcc-4.3.4/gcc/Other-Builtins.html
      */
Comment 1 Sam Lantinga 2017-08-31 22:17:32 UTC 
Fixed, thanks!
https://hg.libsdl.org/SDL/rev/b5e2b88d5193