[petsc-users] PETSc4Py with Enthough Python Distribution

[Barry Smith]

On Jun 12, 2010, at 6:45 PM, Amal Alghamdi wrote:

> Dear All,
> 
> I have Mac OS 10.6 and I'd like to ask if any one have tried using PETSc4Py with Enthough Python Distribution, EPD. I have tried to build PETSc with the option --download-petsc4py but it complained that I am not using the system python
> 
> realpath of /usr/lib/libpython.dylib (/System/Library/Frameworks/Python.framework/Versions/2.6/Python) does not point to Python library path (/Library/Frameworks/Python.framework/Versions/6.1/Python) for current Python;
>  Are you not using the Apple python?
> 
> Does that mean I should use Apple python or there is a way to make PETSc4Py works on EPD.

   Take a look at config/PETSc/packages/petsc4py.py and the lines

      if os.path.isfile(os.path.join(prefix,'Python')):
        for i in ['/usr/lib/libpython.dylib','/opt/local/lib/libpython2.5.dylib','/opt/local/lib/libpython2.6.dylib']:
          if os.path.realpath(i) == os.path.join(prefix,'Python'):
            self.addDefine('PYTHON_LIB','"'+os.path.join(i)+'"')
            return
        raise RuntimeError('realpath of /usr/lib/libpython.dylib ('+os.path.realpath('/usr/lib/libpython.dylib')+') does not point to Python library path ('+os.path.join(prefix,'Python')+') for current Python;\n Are you not using the Apple python?')

  The problem is that some python on apples make it a little difficult to find the python shared library (that ends in .dylib) that is needed by PETSc4py.  This is our hack to find the right .dylib; perhaps you can add the location of the dylib that you need to the list and get it to work? If you cannot find the right . dylib (which is actually just a link to the os.path.join(prefix,'Python') file you could make your own dummy libpython.dylib and point to that?


    Good luck and let us know how it goes,

   Barry

> 
> Thank you very much
> Amal

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