[Bug c/65812] gcc 4.9.1 doesn't warn about uninitialized variable use declared in a switch/case statement when compiled with -O

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65812

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2015-04-20
     Ever confirmed|0                           |1

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
This is because at the point where we warn we don't know that the code is
executed unconditionally and with optimization we don't warn about
maybe-uninitialized uses early.

Late we have removed all code as dead and thus do not warn either.

I'd say it works as intended (even though surprising).