[Piglit] [PATCH] egl-util: Define EGL_KHR_gl_colorspace symbols for older distros.y

[Dylan Baker]

On Fri, Jul 10, 2015 at 10:36:09AM +0100, Emil Velikov wrote:
> On 10 July 2015 at 09:22, Dylan Baker <baker.dylan.c at gmail.com> wrote:
> > Maybe a better plan is to have the test detect that those aren't defined and
> > skip?
> >

Please explain why a test checking for required functionality and
skipping if that functionality isn't present is not a valid solution?
This is AFAICT the way the piglit generally works, a test asks GL if the
feature it tests are present, and skips if they are not.

So in that case something as simple as:
#ifndef <MY_CONSTANT>
return PIGLIT_SKIP;
#endif

at the top of the main function should be sufficient.

> A few other suggestions:
>  - Check that the headers are new enough and bail out early in cmake.
> Unfortunately distros may insist on keeping old headers, despite that
> updating (and using) them won't cause ABI breakage.

This would make it impossible to build new piglit against a sufficiently
old version of mesa (or any GL driver) (which could mean a year, or an
hour), which would make bisecting regressions impossible.

>  - Have a local copy of the headers in-tree.
> Could get ugly, but many projects seems to be doing it.

This also seems less than desirable, because now we're maintaining two
copies, which will be error prone.

> I'm leaning towards the former, although feel free to use whichever you fancy.
> 
> -Emil

Dylan
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