https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61250
--- Comment #11 from howarth at bromo dot med.uc.edu --- It appears that -dH does indeed produce a core in /cores. Using... gdb /sw/src/fink.build/gcc5-5.0.0-1/darwin_objdir/gcc/cc1plus /cores/core.92484 the bt shows... #0 0x00007fff96238286 in __pthread_kill () #1 0x00007fff9488042f in pthread_kill () #2 0x00007fff8e9c1b53 in abort () #3 0x0000000100f31530 in linemap_lookup (set=0x10175d000, line=651) at ../../gcc-5-20150325/libcpp/line-map.c:763