[Bug driver/84749] -w does not work with option property Warn

[msebor at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84749

Martin Sebor <msebor at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2018-03-08
                 CC|                            |msebor at gcc dot gnu.org
     Ever confirmed|0                           |1

--- Comment #1 from Martin Sebor <msebor at gcc dot gnu.org> ---
I recently noticed this too.  For instance, here -w suppresses -Wreturn-type
but doesn't suppress the warning about -Wmudflap being no longer supported:

$ grep -B1 "Warn(" /src/gcc/svn/gcc/c-family/c.opt | head -n2
Wmudflap
C ObjC C++ ObjC++ Ignore Warn(switch %qs is no longer supported)

$ echo "f() { }" | gcc -S -Wall -Wextra -Wmudflap -Wreturn-type -w -xc -
xgcc: warning: switch ‘-Wmudflap’ is no longer supported