[Bug bootstrap/86518] Strengthen bootstrap comparison by not enabling warnings at stage3

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86518

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2018-07-16
                 CC|                            |msebor at gcc dot gnu.org,
                   |                            |rguenth at gcc dot gnu.org
     Ever confirmed|0                           |1

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
That's bad.  I guess the range-warnings are guilty here.  It would be
interesting to check whether it works OK with GCC 7 (or GCC 6).

But confirmed, this would be a good idea!

Martin should have an idea what warning flags control the range-setting so we
can see if we can survive with explicitely adding those.