[Piglit] EGL-related build errors starting with commit 6b71f217052

[Ilia Mirkin]

Hi Chad,

I've recently started getting build errors on piglit, and have
narrowed it down to your commit 6b71f217052 ("util/egl: Add
piglit_egl_get_default_display()"). The build error I'm getting is

tests/util/piglit-util-egl.c: In function 'piglit_egl_get_default_display':
tests/util/piglit-util-egl.c:111:7: error: 'EGL_PLATFORM_X11_EXT'
undeclared (first use in this function)
tests/util/piglit-util-egl.c:111:7: note: each undeclared identifier
is reported only once for each function it appears in
tests/util/piglit-util-egl.c:116:7: error: 'EGL_PLATFORM_WAYLAND_EXT'
undeclared (first use in this function)
tests/util/piglit-util-egl.c:121:7: error: 'EGL_PLATFORM_GBM_MESA'
undeclared (first use in this function)
make[2]: *** [target_api/no_api/tests/util/CMakeFiles/piglitutil.dir/piglit-util-egl.c.o]
Error 1

And indeed, these defines do not exist in my system eglext.h (which
comes from Mesa 10.0.4). They do, however, appear in the mesa git one.

I think it's a little annoying to force people to build against the
very latest EGL headers, but I guess it's not the worst thing in the
world either. However I was hoping there'd be a way to not force that,
for convenience. I'm not well-enough versed in (E)GL to know how to
deal with this though.

Any ideas?

  -ilia