[Bug 107842] "invariant" qualifier on outputs of GLSL ES fragment shader causes compilation error.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=107842

            Bug ID: 107842
           Summary: "invariant" qualifier on outputs of GLSL ES fragment
                    shader causes compilation error.
           Product: Mesa
           Version: git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: glsl-compiler
          Assignee: danylo.piliaiev at gmail.com
          Reporter: danylo.piliaiev at gmail.com
        QA Contact: intel-3d-bugs at lists.freedesktop.org

For example fragment shader containing:

 invariant gl_FragColor;

Or:

 invariant out highp vec4 test;

Causes similar error:

 error: `gl_FragColor' cannot be marked invariant; interfaces between shader
stages only.

However in all GLSL ES specs there is no restriction on usage of "invariant"
with output variables in fragment shader.

 From Section 4.6.1 ("The Invariant Qualifier") GLSL ES 1.00 spec:
 "Only the following variables may be declared as invariant:
   ...
   - Built-in special variables output from the fragment shader."

 From Section 4.6.1 ("The Invariant Qualifier") GLSL ES 3.00 spec:
 "Only variables output from a shader can be candidates for invariance."

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