[Bug middle-end/4210] should not warn in dead code

[glisse at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=4210

--- Comment #43 from Marc Glisse <glisse at gcc dot gnu.org> ---
(In reply to Niels Möller from comment #42)
> And what's the easiest way to run the the right compiler process (I guess
> that's cc1) under gdb?

gcc -c t.c -wrapper gdb,--args