Brad King ff3c11eeac FindOpenGL: Add option to prefer GLVND for legacy GL ...

Since commit v3.10.0-rc5~3^2 (FindOpenGL: Default to non-GLVND libraries
for legacy GL, 2017-11-08) users may set `OPENGL_gl_LIBRARY` to empty to
use GLVND components for the legacy GL interfaces.  This is useful only
when one knows in advance that the GLVND components will be found.

Add a `OpenGL_GL_PREFERENCE` variable to specify a preference for legacy
GL or GLVND.  The latter can suppress `OPENGL_gl_LIBRARY` only when the
needed GLVND components are found.  If no preference is explicitly
specified, choose a default based on whether GLVND components were
requested (because this indicates the project has been updated for
CMake 3.10).

Issue: #17437
Issue: #17449

2017-11-15 13:44:59 -05:00

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