Re: Mac OS X .dylib not working

[Hans Aberg <haberg@math.su.se>]

On 2 Feb 2010, at 17:52, Bob Friesenhahn wrote:

> Under OS-X (Leopard and later), the 'dtruss' program can be used to  
> see what is really going on.

While at it, I found another problem involving libltdl.7.dylib,  
guile-1.8.7 and lilypond 2.13.7:

When upgrading guile using libtool-2.2.6b, lilypond broke, the one  
which is in an Application distribution:
   /Applications/LilyPond.app/Contents/Resources/bin/guile
It has its own
   /Applications/LilyPond.app/Contents/Resources/lib/libltdl.7.dylib

However, dtruss shows that segmentation fault is caused when calling
   /usr/local/lib/libltdl.7.dylib

When I move this to another name, then lilypond works, but dtruss now  
shows that it calls
   /usr/lib/libltdl.7.dylib

So it seems lilypond never calls its own libltdl.7.dylib.

The problem here, though, is the combination of incompatible versions  
of libltdl.7.dylib in combination with a library search path. If they  
really are incompatible, there seems to be no point in having a  
searchpath.

I think that gcc on Mac OS X makes hardcoded full paths for libraries.  
So libtool would then implement its own library search paths.

Also, it seems having no problem open .dylib files here.

   Hans