[Bug libitm/63781] potential linkage issue with libitm.1.dylib

[howarth at bromo dot med.uc.edu]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63781

--- Comment #5 from howarth at bromo dot med.uc.edu ---
The problematic code in eh_cpp.cc appears to be...

#if !defined (HAVE_ELF_STYLE_WEAKREF)
void *__cxa_allocate_exception (size_t) { return NULL; }
void __cxa_throw (void *, void *, void *) { return; }
void *__cxa_begin_catch (void *) { return NULL; }
void __cxa_end_catch (void) { return; }
void __cxa_tm_cleanup (void *, void *, unsigned int) { return; }
void _Unwind_DeleteException (_Unwind_Exception *) { return; }
#endif /* HAVE_ELF_STYLE_WEAKREF */
}

If I append

void __cxa_tm_cleanup (void *, void *, unsigned int) { return; }

after that the linkage succeeds using the xg++ compiler without unresolved
symbols