2.12.5 __FUNCTION__ and __PRETTY_FUNCTION__

__FUNCTION__ and __PRETTY_FUNCTION__ are predefined identifiers that contain the name of the lexically-enclosing function. They are functionally equivalent to the c99 predefined identifier, __func__. On Solaris platforms, __FUNCTION__ and __PRETTY_FUNCTION__ are not available in -Xs and -Xc modes.