[Piglit] [PATCH] cmake: don't fail, on Linux, if X11 is not found

[Mircea Gherzan]

On 20-Apr-16 7:58 PM, Dylan Baker wrote:
> Quoting Mircea Gherzan (2016-04-20 09:23:00)
>>
>> Then can you please suggest another approach for allowing piglit to
>> build on a system with no X11 or GLX headers?
>>
>> Right now, on such a system, I get:
>>
>> CMake Error at
>> /usr/share/cmake-3.2/Modules/FindPackageHandleStandardArgs.cmake:138
>> (message):
>>    Could NOT find OpenGL (missing: OPENGL_gl_LIBRARY OPENGL_INCLUDE_DIR)
>> Call Stack (most recent call first):
>>    /usr/share/cmake-3.2/Modules/FindPackageHandleStandardArgs.cmake:374
>> (_FPHSA_FAILURE_MESSAGE)
>>    /usr/share/cmake-3.2/Modules/FindOpenGL.cmake:168
>> (FIND_PACKAGE_HANDLE_STANDARD_ARGS)
>>    CMakeLists.txt:49 (find_package)
>
> Whoa, hold up. That's not GLX you're missing, that's OpenGL you're
> missing. That's two completely different problems.
>
> Are you trying to run piglit on a system with only GLES or with desktop
> OpenGL but no X11 (or at least GLX)?

I've built Mesa with --disable-glx so there's no libGL.so. I do have the 
Mesa <install_dir>/lib/pkgconfig to PKG_CONFIG_PATH and the cmake still 
fails with "Could NOT find OpenGL".

> In the short term you could pass -DPIGLIT_BUILD_GL_TESTS=0 to cmake right?

Tried it but I fails with:

CMake Error: The following variables are used in this project, but they 
are set to NOTFOUND.
Please set them or make sure they are set and tested correctly in the 
CMake files:
OPENGL_gl_LIBRARY

-- 
- Mircea