[vtk-developers] Building VTK. DCMAKE_BUILD_WITH_INSTALL_RPATH:BOOL=ON and python wrappers

[Samuel John]

Warm greetings to the vtk devs!
VTK is wonderful. ;-)

I have updated the homebrew (http://mxcl.github.com/homebrew/) 
vtk.rb formula (https://github.com/samueljohn/homebrew/blob/master/Library/Formula/vtk.rb), 
which is responsible to install vtk with optional `--python` bindings on the Mac. I works.

However, recently I needed to resort to an ugly work-a-round, and at least I'd like to let you guys know. Or better, get a hint on how to improve.

Homebrew builds all software packages in a <tempdir> and then moves it to, e.g. /usr/local/Cellar/vtk/<version>/... and /usr/local/lib/vtk is a symlink to that dir.
We use DCMAKE_INSTALL_NAME_DIR and DCMAKE_BUILD_WITH_INSTALL_RPATH:BOOL=ON to get the final RPATH correctly written into the libs, even if we build in a <tempdir>.
Then, just during the "make install", we add the <tempdir>/build/bin to DYLD_LIBRARY_PATH and that used to work well, since the freshly built libs can find each other.
Unfortunately, now we get the error:

> make install
> [...]
> Linking CXX executable ../../bin/vtkpython
> [ 95%] Building CXX object Infovis/CMakeFiles/vtkInfovisPythonD.dir/vtkRISReaderPython.cxx.o
> [ 95%] [ 95%] Building CXX object Infovis/CMakeFiles/vtkInfovisPythonD.dir/vtkRandomGraphSourcePython.cxx.o
> Building CXX object Infovis/CMakeFiles/vtkInfovisPythonD.dir/vtkRandomLayoutStrategyPython.cxx.o
> ld: file not found: /usr/local/Cellar/vtk/5.8.0/lib/vtk-5.8/libvtkDICOMParser.5.8.dylib for architecture x86_64
> collect2: ld returned 1 exit status
> [ 95%] make[2]: *** [bin/vtkpython] Error 1
> make[1]: *** [Wrapping/Python/CMakeFiles/vtkpython.dir/all] Error 2
> make[1]: *** Waiting for unfinished jobs....

Obviously, some make target associated with python wrapping already expected the a dylib at the target location (where it is not yet).

Now to my before-mentioned, ugly work-a-round:
Is there a better way than to introduce a temporary symlink:  /usr/local/Cellar/vtk/5.8.0/lib/vtk-5.8 --->  <tempdir>/build/bin ???
I put this symlink, then "make" then remove that symlink, then "make install". Seems to work. Python can import vtk.

bests,
 Samuel