HAVE_GCC_ATOMICS covers the test and set

configure.in

@@ -311,8 +311,7 @@ if test x$enable_gcc_atomics = xyes; then
 
     if test x$have_gcc_atomics = xyes; then
         AC_DEFINE(HAVE_GCC_ATOMICS)
-    fi
-
+    else
         # See if we have the minimum operation needed for GCC atomics
         AC_TRY_LINK([
         ],[
@@ -324,6 +323,7 @@ if test x$enable_gcc_atomics = xyes; then
         if test x$have_gcc_sync_lock_test_and_set = xyes; then
             AC_DEFINE(HAVE_GCC_SYNC_LOCK_TEST_AND_SET)
         fi
+    fi
 fi
 
 # Standard C sources

include/SDL_config_iphoneos.h

@@ -44,7 +44,6 @@ typedef unsigned long uintptr_t;
 #define SDL_HAS_64BIT_TYPE	1
 
 #define HAVE_GCC_ATOMICS	1
-#define HAVE_GCC_SYNC_LOCK_TEST_AND_SET	1
 
 #define HAVE_ALLOCA_H		1
 #define HAVE_SYS_TYPES_H	1

src/atomic/SDL_spinlock.c

@@ -36,7 +36,7 @@ SDL_AtomicTryLock(SDL_SpinLock *lock)
 #elif defined(__MACOSX__)
     return OSAtomicCompareAndSwap32Barrier(0, 1, lock);
 
-#elif defined(HAVE_GCC_SYNC_LOCK_TEST_AND_SET)
+#elif defined(HAVE_GCC_ATOMICS) || defined(HAVE_GCC_SYNC_LOCK_TEST_AND_SET)
     return (__sync_lock_test_and_set(lock, 1) == 0);
 
 #elif defined(__GNUC__) && defined(__arm__) && defined(__ARM_ARCH_5__)