__sync_val_compare_and_swap_4_c
#pragma redefine_extname __sync_val_compare_and_swap_4_c __sync_val_compare_and_swap_4
__strong_reference(__sync_val_compare_and_swap_4_c, __sync_val_compare_and_swap_4);
__strong_reference(__sync_val_compare_and_swap_4_c, __sync_val_compare_and_swap_4);