[CMake] Gathering up required shared libraries

[Clinton Stimpson]

On Monday, August 01, 2011 07:12:15 pm Gregory Crosswhite wrote:
> Hey everyone,
> 
> I am using CMake to build a package which has the normal unix layout,
> i.e. programs are in bin/, libraries are in lib/, etc., and I would like
> to simply copy all of the required shared non-system libraries into lib/
> and make sure that the executable is updated to look for them there so
> that I can have an standalone distribution.  CMake *almost* supports
> this with fixup_bundle, but unless I am missing something it doesn't
> seem to give me any control as to where the shared libraries are
> installed, and it doesn't update the executable except on OSX --- though
> the latter is not a big deal since if I understand correctly I can just
> add @executable_path@/../lib to the RPATH.  Furthermore, on Linux it
> incorrectly assumes that libraries in /usr/lib should be considered
> system libraries (that is, guaranteed to be available everywhere), when
> in fact only libraries in /lib should be, which means that I can't even
> easily use get_prerequisites directly to find all of the libraries that
> I need and then copy them to the correct location myself.
> 
> (Of course, an alternative would be to just statically-link everything,
> but frankly having searched around it looks like it is simply impossible
> for me to force all non-system libraries to be statically linked,
> especially since once of them is libgfortran which is included
> automatically by the gfortran compiler and I can't figure out a good way
> to get CMake to reliably link statically to libgfortran instead of
> dynamically.  If anyone has any recommendations on this front I would be
> happy to hear them.)
> 
> So anyway, at the moment to do what I want it looks like I would have to
> make my own project-specific copies of GetPrerequisites.cmake and
> BundleUtilities.cmake and then hack them up in order to force them to do
> what I want.  But I can't help but think that there must have lots of
> people out there who have wanted to do what I want to do and so this
> problem must have been solved in a much better way.  So does anyone have
> advice for a way to do what I want, i.e. an easy way to copy all
> non-system libraries (where only /lib is interpreted to be the location
> of system libraries) to a directory of my choosing relative to the
> installation prefix and to modify the executable to make sure it finds
> them?  Or is my only option really to copy into my project and hack up
> GetPrerequisites.cmake and BundleUtilities.cmake?
> 

You shouldn't need to copy GetPrerequisites and BundleUtilities.

For Linux you can do:
set_target_properties( ... PROPERTIES INSTALL_RPATH "\$ORIGIN/../lib")

To get /usr/lib/ to be treated as non-system libraries, you can implement 
gp_resolved_file_type_override() 
to adjust that behavior.
See gp_item_default_embedded_path() in GetPrerequisites for more information.

And finally, to copy the dependents into lib/ instead of bin/, you can 
implement 
gp_item_default_embedded_path_override() 
to return a different path.
See gp_resolved_file_type() in GetPrerequisites for more information.

-- 
Clinton Stimpson
Elemental Technologies, Inc
Computational Simulation Software, LLC
www.csimsoft.com