[Mesa-dev] [Bug 89823] [swrast] driver loads but complains then fails to work in Piglit which shows GLSL message

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89823

            Bug ID: 89823
           Summary: [swrast] driver loads but complains then fails to work
                    in Piglit which shows GLSL message
           Product: Mesa
           Version: git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Other
          Assignee: mesa-dev at lists.freedesktop.org
          Reporter: daniel.sebald at ieee.org
        QA Contact: mesa-dev at lists.freedesktop.org

I was working on a legacy swrast changeset based off of this change point:

-----
commit 27bf37ba05b69ebf6f373d1637a26b4839265921
Author: Jason Ekstrand <jason.ekstrand at intel.com>
Date:   Mon Mar 16 15:08:04 2015 -0700

    nir/peephole_select: Allow uniform/input loads and load_const

    Shader-db results on HSW:
-----

and was able to run tests on Piglit.  I then updated my local repository to the
latest canonical head

-----
commit d64adc3a79e419062432cfa8d1cbc437676a3fbd
Author: Michel Dänzer <michel.daenzer at amd.com>
Date:   Thu Mar 26 11:32:59 2015 +0900

    radeonsi: Cache LLVMTargetMachineRef in context instead of in screen

    Fixes a crash in genymotion with several threads compiling shaders
    concurrently.
-----

and although things compiled as normal, I began seeing the following:

[@ piglit]$ LD_LIBRARY_PATH=/home/sebald/local/lib:/usr/local/lib64
bin/gl-1.0-pixelzoom
libGL error: unable to load driver: nouveau_dri.so
libGL error: driver pointer missing
libGL error: failed to load driver: nouveau
libGL error: unable to load driver: swrast_dri.so
libGL error: failed to load driver: swrast
GLSL not supported.
PIGLIT: {"result": "skip" }

in which the messages about swrast_dri.so and swrast are new.  The message
"GLSL not supported." is also new.

When I use the compiled swrast_dri.so driver in an application I see the same
messages above sans the "GLSL not supported." message.  The application does
graphics, but exactly what it is using I'm not sure if swrast is purportedly
unable to load.

I looked through the changeset entries for something suspicious, but I'm not
knowledgeable enough about the organization of the code and there were 50+
changesets in the past week or so.

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