https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78202
Bug ID: 78202 Summary: declarations of builtins in libitm don't match Product: gcc Version: 7.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: libitm Assignee: unassigned at gcc dot gnu.org Reporter: bernd.edlinger at hotmail dot de Target Milestone: --- C++ does currently not give a warning about it, but this is about to change soon. The following functions are declared in libitm.h: void _ITM_L##T (const _ITM_TYPE##T *) ; void _ITM_LB (const void *, size_t) ; But the builtin functions have a different signature void _ITM_L##T (const _ITM_TYPE##T *) ATTR_TM_TMPURE_NOTHROW_LIST; void _ITM_LB (volatile void*, size_t) ATTR_TM_TMPURE_NOTHROW_LIST; I doubt that the builtin attributes are used due to the type conflict, some of the attributes are impossible to write down in the source code, like attribute((*tm regparm)) so there is probably no work-around.