http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46749
--- Comment #28 from Iain Sandoe <iains at gcc dot gnu.org> 2010-12-03 12:10:42 UTC --- another thing that might help is to hack gcc/spec to put "dsymutil --symtab" that causes dsymutil to dump what it found in the exec and exit without doing the debug-link.
