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Diffstat (limited to 'doc/source/user/building.rst')
| -rw-r--r-- | doc/source/user/building.rst | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/doc/source/user/building.rst b/doc/source/user/building.rst index b4b4371e5..8e2b5c03b 100644 --- a/doc/source/user/building.rst +++ b/doc/source/user/building.rst @@ -195,6 +195,25 @@ or:: BLAS=None LAPACK=None ATLAS=None python setup.py build +64-bit BLAS and LAPACK with symbol suffix +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + +Numpy also supports 64-bit OpenBLAS with ``64_`` symbol suffix. Such +library is obtained by compiling OpenBLAS with settings:: + + make INTERFACE64=1 SYMBOLSUFFIX=64_ + +To make Numpy use it, set ``NPY_USE_BLAS64_=1`` environment variable +when building Numpy. You may also need to configure the +``[openblas64_]`` section in ``site.cfg``. + +The symbol suffix avoids symbol name clashes between 32-bit and 64-bit +BLAS/LAPACK libraries, meaning that you can link to both in the same +program. This avoids potential issues when using 64-bit BLAS/LAPACK in +Numpy while simultaneously using other Python software that uses the +32-bit versions. + + Supplying additional compiler flags ----------------------------------- |