Re: CLG on Mac OSX

On Thu, Aug 31, 2006 at 12:22:27PM +0200, Espen S Johnsen wrote:
> >   WARNING: Pango: `script_engine_init': dlsym(3) failed
> >   Failed to load Pango module for id: 'BasicScriptEngineFc'
> >   [repeated several times...]
> >   Pango: _pango_cairo_font_map_get_renderer: assertion `PANGO_IS_CAIRO_FONT_MAP (fontmap)' failed
> > 
> > I'm wondering if this might be a Pango-on-OSX issue, though:
> > CLG itself appears to be doing its job.
> 
> I don't know what could cause this error, but I noticed that there is a
> tool called pango-querymodules and that its man page mention something
> about a 'Pango module path'.

Yes, pango-querymodule runs fine, and detects all the installed
pango modules.  I can also run pango-view, and other GTK applications.

Since the problem seems to occur when Pango tries to load its
modules, I've rebuild Pango as a single shared library, with all
the modules statically linked in (using the --with-included-modules
option when configuring Pango).  The new static Pango now works fine
under CLG.  I guess this suggests there's some kind of problem under
OSX/Darwin when using dlopen/dlsym from within a library which was
itself opened using dlopen.

When running the CLG examples, I also ran into a very similar problem
with GDK refusing to load its image-decoding modules.  Once again
the solution is to build these modules into the main library
(./configure --disable-modules --with-included-loaders).  Having
done this, CLG is running very nicely on my Mac:

        http://www.derkholm.net/thomas/success.png

I guess I should poke around in the OSX linker documentation
to find out why the module loading isn't working.

        Thomas

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