[vtk-developers] Possible correct to OSMESA builds for static

[Fabian, Nathan]

Hi,

If I build with OSMESA but VTK_USE_X=false and build static, I get failures
to link.  I believe the problem is in the locations where we link
OSMESA_LIBRARY, we need to also explicitly link with OPENGL_gl_LIBRARY (to
be explicit: Utilities/IceT/CMakeLists.txt, VTK/Rendering/CMakeLists.txt,
and VTK/VolumeRendering/CMakeLists.txt).

Example diff:
-SET(KIT_LIBS ${KIT_LIBS} ${OSMESA_LIBRARY})
+SET(KIT_LIBS ${KIT_LIBS} ${OSMESA_LIBRARY} ${OPENGL_gl_LIBRARY})

And similarly for MANGLED_OSMESA_LIBRARY although I haven't tested that.

This is based on my assumption that we'd specify both mesa's GL as the
gl_LIBRARY as well as the OSMESA library itself in the CMakeCache.  If this
is an incorrect assumption then please ignore me :)

This works for me, but is it a correct change?

Thanks,
Nathan.