[Bug 93339] glLinkProgram() should fail when a varying is never written to in a previous stage

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93339

--- Comment #3 from Tapani Pälli <lemody at gmail.com> ---
(In reply to Kenneth Graunke from comment #2)
> Perhaps we should generate a link time warning in this case, when
> GL_PROGRAM_SEPARABLE is not set?  That seems like it could be helpful.
> 
> I'm tempted to change the subject and reopen this as an enhancement.

I guess it should be possible to generate warning. I'm not sure if we currently
track if some variable was written in to during/after optimizations etc though.

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