undefined symbol: cblas_dswap on import

[charlesg]

We had performance issues with Numpy so I recompiled ATLAS (3.8.4),  BLAS and lapack-3.1.1. Now that Numpy uses ATLAS it's much faster on dot() calls but I can't use cvxopt anymore. If I import cvxopt this error (though it seem to build and install fine):

>>> import cvxopt

Traceback (most recent call last):

  File "<stdin>", line 1, in <module>

  File "/usr/lib/python2.7/site-packages/cvxopt/__init__.py", line 31, in <module>

    import base

ImportError: /usr/lib64/liblapack.so: undefined symbol: cblas_dswap

Any ideas what's missing or where the incompatibility is?

[Martin]

You may have to recompile CVXOPT (make sure to link against atlas, blasf77, lapack, and gfortran). Did you build a full lapack library when you compiled ATLAS? Also, what platform are you using?

[Anthony Morrison]

Even though you think you've created your .so correctly, you've missed something.

see (for a similar problem):

http://permalink.gmane.org/gmane.comp.python.scientific.user/9770

ldd is your friend.

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[charlesg]

I did compile the full lapack... Turns out I needed to tweek the setup.py and I addeded cblas and atlas in the list of libs to link against and it seems to work.