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document blas and lapack usage in packages

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Denis Davydov 2016-05-12 08:59:17 +02:00
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lib/spack/docs/packaging_guide.rst
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@ -1994,6 +1994,19 @@ instead of hard-coding ``join_path(self.spec['mpi'].prefix.bin, 'mpicc')`` for
the reasons outlined above. the reasons outlined above.
Blas and Lapack libraries
~~~~~~~~~~~~~~~~~~~~~~~~~
Different packages provide implementation of ``Blas`` and ``Lapack`` routines.
The names of the resulting static and/or shared libraries differ from package
to package. In order to make ``install()`` method indifferent to the
choice of ``Blas`` implementation, each package which provides it
sets up ``self.spec.blas_shared_lib`` and ``self.spec.blas_static_lib `` to
point to the shared and static ``Blas`` libraries, respectively. The same
applies to packages which provide ``Lapack``. Package developers are advised to
use these variables, for example ``spec['blas'].blas_shared_lib`` instead of
hard-coding ``join_path(spec['blas'].prefix.lib, 'libopenblas.so')``.
Forking ``install()`` Forking ``install()``
~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~