Bug#869975: [opencv] bug in debian/rules -> it isn't compiled with OPENGL=ON

[Mattia Rizzolo]

On Fri, Jul 28, 2017 at 05:13:07PM +0200, Mattia Rizzolo wrote:
> On Fri, Jul 28, 2017 at 12:21:32PM +0200, Jean Jacques BRUCKER wrote:
> > There should be missing an "else" in debian/rules which implies
> > WITH_OPENGL is always ON for ubuntu (overriding previous if-else
> > statement) and always undefined for other distributions.

Then, apparently OpenGL is not really feasible with the gtk build we are
doing... from cmake/OpenCVFindLibsGUI.cmake:

|# --- OpenGl ---
|ocv_clear_vars(HAVE_OPENGL HAVE_QT_OPENGL)
|if(WITH_OPENGL)
|  if(WITH_WIN32UI OR (HAVE_QT AND QT_QTOPENGL_FOUND) OR HAVE_GTKGLEXT)
|    find_package (OpenGL QUIET)
|    if(OPENGL_FOUND)

We are not building with Qt (ISTR there were good reason for not do it)
and instead we are building with GTK3.  Now, that HAVE_GTKGLEXT is:

|  if(WITH_OPENGL AND NOT HAVE_GTK3)
|    CHECK_MODULE(gtkglext-1.0 HAVE_GTKGLEXT)
|  endif()

So apparently it can never be set with GTK3…

Also, apparently I can't remember why I added that check last year, but
given the current status I'm going to just drop it, as it's not useful
to anybody.


-- 
regards,
                        Mattia Rizzolo

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