Hi, I have got some code that calls __sync_fetch_and_add __sync_synchronize __sync_lock_test_and_set and it's OK for some target cpus (eg arm cortex-m4), but fails to link when compiled for arm cortex-m0 for lack of the corresponding functions __sync_lock_test_and_set_4 __sync_fetch_and_add_4 __sync_lock_test_and_set_1 I plan to implement those for such cpus (possibly with reduced functionality) as an helper library, but I'd like to do so only when needed. Is checking for __GCC_HAVE_SYNC_COMPARE_AND_SWAP_X the right way of knowing whether I need to provide a definition for __sync_lock_test_and_set_X for instance? Thanks, Christophe
