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$NetBSD: patch-numpy_distutils_system__info.py,v 1.4 2021/06/15 02:48:30 thor Exp $
Our BLAS choice in build system (merged upstream for next release).
--- numpy/distutils/system_info.py.orig 2021-04-20 20:11:02.731971594 +0000
+++ numpy/distutils/system_info.py
@@ -82,6 +82,19 @@ The order of finding the locations of re
3. ALL section in site.cfg
Only the first complete match is returned.
+Note that blas_opt_info and lapack_opt_info honor the NPY_BLAS_ORDER
+and NPY_LAPACK_ORDER environment variables to determine the order in which
+specific BLAS and LAPACK libraries are searched for.
+
+This search (or autodetection) can be bypassed by defining the environment
+variables NPY_BLAS_LIBS and NPY_LAPACK_LIBS, which should then contain the
+exact linker flags to use (language will be set to F77). Building against
+Netlib BLAS/LAPACK or stub files, in order to be able to switch BLAS and LAPACK
+implementations at runtime. If using this to build NumPy itself, it is
+recommended to also define NPY_CBLAS_LIBS (assuming your BLAS library has a
+CBLAS interface) to enable CBLAS usage for matrix multiplication (unoptimized
+otherwise).
+
Example:
----------
[ALL]
@@ -1542,8 +1555,24 @@ class lapack_opt_info(system_info):
notfounderror = LapackNotFoundError
+ def _calc_info_from_envvar(self):
+ info = {}
+ info['language'] = 'f77'
+ info['libraries'] = []
+ info['include_dirs'] = []
+ info['define_macros'] = []
+ info['extra_link_args'] = os.environ['NPY_LAPACK_LIBS'].split()
+ self.set_info(**info)
+ return True
+
def calc_info(self):
+ if 'NPY_LAPACK_LIBS' in os.environ:
+ # Bypass autodetection, set language to F77 and use env var linker
+ # flags directly
+ self._calc_info_from_envvar()
+ return
+
lapack_mkl_info = get_info('lapack_mkl')
if lapack_mkl_info:
self.set_info(**lapack_mkl_info)
@@ -1621,8 +1650,28 @@ class blas_opt_info(system_info):
notfounderror = BlasNotFoundError
+ def _calc_info_from_envvar(self):
+ info = {}
+ info['language'] = 'f77'
+ info['libraries'] = []
+ info['include_dirs'] = []
+ info['define_macros'] = []
+ info['extra_link_args'] = os.environ['NPY_BLAS_LIBS'].split()
+ if 'NPY_CBLAS_LIBS' in os.environ:
+ info['define_macros'].append(('HAVE_CBLAS', None))
+ info['extra_link_args'].extend(
+ os.environ['NPY_CBLAS_LIBS'].split())
+ self.set_info(**info)
+ return True
+
def calc_info(self):
+ if 'NPY_BLAS_LIBS' in os.environ:
+ # Bypass autodetection, set language to F77 and use env var linker
+ # flags directly
+ self._calc_info_from_envvar()
+ return
+
blas_mkl_info = get_info('blas_mkl')
if blas_mkl_info:
self.set_info(**blas_mkl_info)
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