[Bug 103895] Spurious “used uninitialized” warning

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=103895

            Bug ID: 103895
           Summary: Spurious “used uninitialized” warning
           Product: Mesa
           Version: 17.2
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/i965
          Assignee: intel-3d-bugs at lists.freedesktop.org
          Reporter: sgunderson at bigfoot.com
        QA Contact: intel-3d-bugs at lists.freedesktop.org

Hi,

When compiling this GLSL compute shader:

===
#version 430

layout(local_size_x = 1) in;
uniform restrict writeonly image2D outbuf;

vec4 CS_OUTPUT_VAL;

vec4 func() {
        return CS_OUTPUT_VAL;
}

void main()
{       
        CS_OUTPUT_VAL = vec4(0.0, 0.0, 0.0, 1.0);
        vec4 val = func(); 
        imageStore(outbuf, ivec2(0, 0), val);
}
===

I get this warning:

Shader compile log: 0:9(9): warning: `CS_OUTPUT_VAL' used uninitialized

If I move func() below main() (with a forward declaration), the warning goes
away.

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