[CMake] cmake variables to control full path in shared lib on OSX

[Martin Costabel]

Darren Weber wrote:
> I'm exploring how to build and install VTK-5-2-0 on OSX.  I'm trying
> to use shared libraries, but the default settings do not put full
> paths in the .dylib file links for the libvtk* libraries.  I am using
> a non-standard install path (macports /opt/local), so I may need to
> set full paths for the libvtk* links.  For example, this is just one
> of the dylib files and I may need all the links to libvtk* to contain
> the full path (/opt/local/lib/vtk-5.2/):
> 
>[]
> 
> What are the right cmake variables that will enable full paths in the
> shared libraries?

Here is what works for me (I am creating a Fink package, which is a very 
similar situation to yours):

   -DBUILD_SHARED_LIBS:BOOL=ON \
   -DVTK_INSTALL_LIB_DIR:STRING="/lib/vtk52" \
   -DCMAKE_INSTALL_PREFIX:PATH=%p \
   -DCMAKE_INSTALL_NAME_DIR:STRING=%p/lib/vtk52 \
   -DCMAKE_BUILD_WITH_INSTALL_RPATH:BOOL=ON \
   -DVTK_USE_RPATH=ON \

Here %p corresponds to your ${prefix}. There is one catch, however:

VTK builds a couple of executables that are used during building like 
"ProcessShader". If you use the above flags, these executables will 
crash, because they look for the dylibs they are linked with at their 
install location, where they are not yet installed. They must be told to 
look for the dylibs in the build tree instead.

Gnu libtool has a mechanism to deal with this situation (creating 
temporary wrapper scripts for each executable), but if cmake has one, I 
haven't found it. What works for me is to set

  export DYLD_FALLBACK_LIBRARY_PATH=`pwd`/bin

after the cmake run, just before running `make`. This uses the fact that 
the dylibs are built in the same directory build/bin as the executables. 
But it is not an optimal workaround, because if you have an older 
version of vtk installed, the binaries will find these older versions 
first and perhaps not run either. Setting DYLD_LIBRARY_PATH instead of 
DYLD_FALLBACK_LIBRARY_PATH has too many side effects to be usable.

-- 
Martin