[Bug 1943818] [NEW] mesa built with -O3 on ppc64el has broken EGL

[Timo Aaltonen]

Public bug reported:

If mesa is built with -O3 then EGL will fail with:

libEGL warning: DRI2: failed to create any config

this can be easily reproduced by building libepoxy which then runs a
series of tests.

The same is fine on amd64, and also ppc64el is fine with gcc-10 and -O3.

** Affects: mesa
     Importance: Unknown
         Status: Unknown

** Affects: gcc-11 (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: mesa (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: ppc64el

** Bug watch added: gitlab.freedesktop.org/mesa/mesa/-/issues #5315
   https://gitlab.freedesktop.org/mesa/mesa/-/issues/5315

** Also affects: mesa via
   https://gitlab.freedesktop.org/mesa/mesa/-/issues/5315
   Importance: Unknown
       Status: Unknown

** Also affects: gcc-11 (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1943818

Title:
  mesa built with -O3 on ppc64el has broken EGL

Status in Mesa:
  Unknown
Status in gcc-11 package in Ubuntu:
  New
Status in mesa package in Ubuntu:
  New

Bug description:
  If mesa is built with -O3 then EGL will fail with:

  libEGL warning: DRI2: failed to create any config

  this can be easily reproduced by building libepoxy which then runs a
  series of tests.

  The same is fine on amd64, and also ppc64el is fine with gcc-10 and
  -O3.

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