[Bug middle-end/64339] reject unsafe options in pragma GCC optimize

[egallager at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64339

Eric Gallager <egallager at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2017-09-28
                 CC|                            |egallager at gcc dot gnu.org,
                   |                            |jsm28 at gcc dot gnu.org
     Ever confirmed|0                           |1

--- Comment #1 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Manuel López-Ibáñez from comment #0)
> Some options are known to be unsafe to set via pragma GCC optimize. See:
> https://sourceware.org/ml/libc-alpha/2014-12/msg00597.html and
> https://sourceware.org/ml/libc-alpha/2014-12/msg00599.html
> 
> It would be better to add a flag to the *.opt files to mark safe options
> explicitly, such that specifying any option that is not safe produces a
> fatal error.

Taking Joseph's comments in the linked thread as confirmation.