Do the "fix" for asserts with MSVC's /W4 warnings only on MSVC. Naturally, this way generates a warning on GCC and Clang instead. :)
diff --git a/include/SDL_assert.h b/include/SDL_assert.h
index 5e6f4fc..0d7229d 100644
--- a/include/SDL_assert.h
+++ b/include/SDL_assert.h
@@ -88,7 +88,11 @@ disable assertions.
/* "while (0,0)" fools Microsoft's compiler's /W4 warning level into thinking
this condition isn't constant. And looks like an owl's face! */
+#ifdef _MSC_VER /* stupid /W4 warnings. */
#define SDL_NULL_WHILE_LOOP_CONDITION (0,0)
+#else
+#define SDL_NULL_WHILE_LOOP_CONDITION (0)
+#endif
#define SDL_disabled_assert(condition) \
do { (void) sizeof ((condition)); } while (SDL_NULL_WHILE_LOOP_CONDITION)