[Bug bootstrap/51388] Configure failure to detect unsupported warning options for non-bootstrap builds (including cross builds)

["rguenth at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51388

Richard Guenther <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |WAITING
   Last reconfirmed|                            |2011-12-02
                 CC|                            |jsm28 at gcc dot gnu.org
     Ever Confirmed|0                           |1

--- Comment #1 from Richard Guenther <rguenth at gcc dot gnu.org> 2011-12-02 14:51:14 UTC ---
I think the issue is that we allow random -Wno- as argument, but not
positive variants.  Trunk:

> ./xgcc -B. -c t.c -Wno-foo
> ./xgcc -B. -c t.c -Wfoo
xgcc: error: unrecognized command line option '-Wfoo'

that's probably deliberate.  So the bug is that we check for
-Wno-narrowing instead of -Wnarrowing.

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)

Still the behavior of warning for -Wno- changed appearantly.  Joseph?