[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

Tapani Pälli <lemody at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |NOTABUG

--- Comment #1 from Tapani Pälli <lemody at gmail.com> ---
I don't see that GL specification would state link failure for variables that
are read but not written. There are number of instances of "Values for any
inputs that are not written by a shader are undefined." within description of
different shader stages.

When using separate shader objects on desktop, one is able to even combine
programs with interfaces that do not match exactly, on GL ES they have to be
exact match (same amount of outputs and inputs)

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