PR 36778: Should we have -Wfatal-warnings

[Paolo Carlini]

Hi,

I was having a look to this long standing, and unconfirmed, PR:

     http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36778

and the rationale makes sense to me. What do you think, shall we have 
-Wfatal-warnings too, together with -Wfatal-errors?

AFAICS, the patch would be rather trivial, little more than the 
attached, modulo a few tests and a few lines of documentation...

Thanks!
Paolo.
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