[Bug 104971] Test failures on 32 bit Mesa compiled with GCC 7.x

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=104971

            Bug ID: 104971
           Summary: Test failures on 32 bit Mesa compiled with GCC 7.x
           Product: Mesa
           Version: git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/i965
          Assignee: intel-3d-bugs at lists.freedesktop.org
          Reporter: clayton.a.craft at intel.com
        QA Contact: intel-3d-bugs at lists.freedesktop.org
            Blocks: 104757

Compiling 32 bit Mesa with GCC 7.x and -O1 results in a number of test failures
in piglit (e.g. packUnorm2x16).

These tests do *not* fail in either of the following cases:

1) Mesa is compiled with GCC 7 and the -mfpmath=sse flag

2) Mesa is compiled with GCC 6.x

3) Mesa is compiled with -O0

Compiling Mesa with GCC 7 and negating the (exposed) options (e.g.
-fno-<option>) that are enabled by -O1 still results in a failure. These
options were collected from the output of: gcc -Q --help=optimizers -O1|grep
enabled


Referenced Bugs:

https://bugs.freedesktop.org/show_bug.cgi?id=104757
[Bug 104757] [TRACKER] Mesa 18.0 release tracker
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