[vtk-developers] compiling vtk with enthought python issue/partial solution

[Lauren O'Donnell]

Hi,

I just upgraded to Max OS X 10.8.2 (mountain lion) and I'm trying to
compile VTK with python wrapping, using the Enthought Python distribution
(EPD). I have done this in the past many times with no issues. But now the
linker (on the command line) is requesting a symbol that is defined in
system python but not EPD, making the compilation fail.

This symbol "-u _PyMac_Error" wasn't ever needed by VTK before, and
removing it from the linker line here:
VTK-build/Wrapping/Python/CMakeFiles/vtkpython.dir/link.txt
fixes the problem as far as I can see (compilation works fine and I can
import vtk into python and make objects).

Is there some reason that this "-u _PyMac_Error" is needed now? Can this be
changed in a better way in CMake files somewhere?

Any suggestions are appreciated. Build errors and the results of nm are
below. I'm using a VTK checkout from this afternoon using git clone git://
vtk.org/VTK.git. The machine is OS X 10.8.2. I have the latest Xcode.

Thanks!
--Lauren

ERROR
-------------
Apple clang version 4.1 (tags/Apple/clang-421.11.65) (based on LLVM 3.1svn)
Target: x86_64-apple-darwin12.2.0
Thread model: posix
  "/usr/bin/ld" -demangle -dynamic -arch x86_64 -macosx_version_min 10.8.0
-u _PyMac_Error -o ../../bin/vtkpython -search_paths_first
-headerpad_max_install_names
CMakeFiles/vtkpython.dir/vtkPythonAppInit.cxx.o
/Library/Frameworks/EPD64.framework/Versions/Current/lib/libpython2.7.dylib
../../lib/libvtksys-6.0.1.dylib ../../lib/libvtkCommonCore-6.0.1.dylib
/usr/lib/libutil.dylib ../../lib/libvtksys-6.0.1.dylib -lstdc++ -lSystem
/usr/bin/../lib/clang/4.1/lib/darwin/libclang_rt.osx.a
[  8%] Scanning dependencies of target vtkCommonSystemCxxTests
Scanning dependencies of target vtkhdf5
Built target vtkWrappingPython
Scanning dependencies of target vtkCommonMisc
 Linking C shared library ../../../lib/libvtktiff-6.0.dylib
Scanning dependencies of target vtkCommonTransforms
Undefined symbols for architecture x86_64:
  "_PyMac_Error", referenced from:
     -u command line option
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see
invocation)
make[2]: *** [bin/vtkpython] Error 1
make[1]: *** [Wrapping/Python/CMakeFiles/vtkpython.dir/all] Error 2
make[1]: *** Waiting for unfinished jobs....

_PyMac_Error symbol
-----------------------------------
If I check the libraries, the system python defines it but the EPD python
does not define this symbol (and neither did previous EPD versions that pre
OS X 10.8 and clang worked fine with VTK)

brage:~ odonnell$ nm
/Library/Frameworks/Python.framework/Versions/Current/lib/libpython2.7.dylib
| grep PyMac_Error
0011a1f0 T _PyMac_Error
00102890 T _PyMac_Error
brage:~ odonnell$ nm
/Library/Frameworks/EPD64.framework/Versions/Current/lib/libpython2.7.dylib
 | grep PyMac_Error
brage:~ odonnell$
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