$ gcc hello.c -- -MM hello.o: hello.c gcc: ambiguous abbreviation --
-- Summary: "--" does not end option parsing Product: gcc Version: 4.2.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: driver AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: schwab at suse dot de http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29270