Don't use __builtin_clz() on gcc2. (thanks, Axel!)

Fixes Bugzilla #1771.
libsdl-org · Mar 30, 2013 · 3acf1764c3136fcdf51d3f36ab8dc096639a3f88 · 3acf176 · 3acf176
1 parent bac7510
commit 3acf1764c3136fcdf51d3f36ab8dc096639a3f88
diff --git a/include/SDL_bits.h b/include/SDL_bits.h
@@ -52,7 +52,7 @@ extern "C" {
 SDL_FORCE_INLINE Sint8
 SDL_MostSignificantBitIndex32(Uint32 x)
 {
-#if defined(__GNUC__)
+#if defined(__GNUC__) && __GNUC__ >= 4
     /* Count Leading Zeroes builtin in GCC.
      * http://gcc.gnu.org/onlinedocs/gcc-4.3.4/gcc/Other-Builtins.html
      */