[Bug 94188] define (or undef) defined behaves stupidly

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94188

            Bug ID: 94188
           Summary: define (or undef) defined behaves stupidly
           Product: Mesa
           Version: git
          Hardware: All
                OS: All
            Status: NEW
          Severity: minor
          Priority: medium
         Component: glsl-compiler
          Assignee: idr at freedesktop.org
          Reporter: idr at freedesktop.org
        QA Contact: intel-3d-bugs at lists.freedesktop.org

A shader like

    #define defined gl_Position
    void main()
    {
        defined = vec4(1.0);
    }

should either file to compile at line 1 or it should "just work."  Instead,
Mesa produces a fairly obtuse error message:

    0:5(2): error: `defined' undeclared
    0:5(2): error: value of type vec4 cannot be assigned to variable of type
error

Apparently some dEQP test expects '#define defined' and '#undef defined' to
just work, but glslang generates an error.  See also
https://github.com/KhronosGroup/glslang/issues/59.  Either way, Mesa's behavior
is wrong.

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