[Octave-bug-tracker] [bug #47886] Do not link against libraries without OpenGL

[Mike Miller]

Update of bug #47886 (project octave):

                  Status:                    None => Confirmed              

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Follow-up Comment #1:

I can confirm that building Octave with --without-opengl still links with
fltk, gl2ps, freetype, and fontconfig, and libGL indirectly through one or
more of these libraries.

I do *not* get the error shown here because on my system the OpenGL libraries
are pulled in via gl2ps or fltk, so no unresolved symbols. But the end result
is linked with libGL.

The provided patch attempts to put the logic back into configure to bypass
checking for things that may depend on OpenGL.

I think we should fix this in the code, if possible, if there is a code module
that depends on both gl2ps and OpenGL, then more conditionals should be added
to ensure that it isn't built without both of them enabled. The module that
fails to link that you've shown does indeed have OpenGL calls in the code, so
maybe it should be conditioned against both HAVE_GL2PS and HAVE_OPENGL.

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