http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51388
--- Comment #7 from Steven Bosscher <steven at gcc dot gnu.org> 2011-12-02 16:48:45 UTC --- (In reply to comment #1) > Now, the question is why we don't consistently error in 4.3 ... > > I see > > > gcc-4.3 -c -Wno-narrowing t.c -DHAVE_ARG > cc1: error: unrecognized command line option "-Wno-narrowing" > > with FSF GCC 4.3.6. So, are you sure this isn't behavior caused by > vendor patches? (openSUSE GCC 4.3 also works) I think this is due to the patch "pr28322.dpatch" in the Debian GCC 4.3.2-1.1 package. IIUC that patch is also in GCC 4.4. Is that something you can confirm?