[Bug 100543] GPU hang in piglit.shaders.glsl-max-varyings >max_varying_components

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=100543

            Bug ID: 100543
           Summary: GPU hang in piglit.shaders.glsl-max-varyings
                    >max_varying_components
           Product: Mesa
           Version: git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/i965
          Assignee: notasas at gmail.com
          Reporter: mark.a.janes at intel.com
        QA Contact: intel-3d-bugs at lists.freedesktop.org
                CC: mattst88 at gmail.com

Apparently triggered by:

a6a38a038bd62e6d9558905f00bef81b5e7e6fcc
Author:     Grazvydas Ignotas <notasas at gmail.com>
Commit:     Matt Turner <mattst88 at gmail.com>

util/u_atomic: provide 64bit atomics where they're missing

There are still some distributions trying to support unfortunate people
with old or exotic CPUs that don't have 64bit atomic operations. When
compiling for such a machine, gcc conveniently inserts a library call to
a helper, but it's implementation is missing and we get a linker error.
This allows us to provide our own implementation, which is marked weak
to prefer a better implementation, should one exist.

v2: changed copyright, some style adjustments
v3: [mattst88] Print results with AC_MSG_CHECKING/AC_MSG_RESULT

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=93089
Signed-off-by: Grazvydas Ignotas <notasas at gmail.com>
Reviewed-by: Matt Turner <mattst88 at gmail.com>

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