8000 ENH: add user control to check embedded lapack in openblas by zerothi · Pull Request #5855 · numpy/numpy · GitHub
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ENH: add user control to check embedded lapack in openblas #5855

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ENH: add user control to check embedded lapack in openblas #5855

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13 changes: 12 additions & 1 deletion numpy/distutils/system_info.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1743,7 +1743,18 @@ class openblas_lapack_info(openblas_info):
notfounderror = BlasNotFoundError

def check_embedded_lapack(self, info):
res = False

# Enable the user to force embedded lapack.
# This can be used to bypass the following test
# which will often fail for gnu compiler env's
# Specifically the gfortran library might be necessary
# if OpenBLAS has been compiled without lapack support.
res = self.cp.has_option(self.section,'embedded_lapack')
if res:
res = self.cp.getboolean(self.section,'embedded_lapack')
if res:
return res

c = distutils.ccompiler.new_compiler()
tmpdir = tempfile.mkdtemp()
s = """void zungqr();
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17 changes: 17 additions & 0 deletions site.cfg.example
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Expand Up @@ -121,6 +121,23 @@
# multiprocessing.
# (This problem does not exist with multithreaded ATLAS.)
#
# **Notice**: If you have build OpenBLAS without LAPACK support you are encouraged
# to have this:
# [openblas]
# libraries = lapack,openblas
# to force OpenBLAS usage and external lapack, be sure to have the lapack
# directory in the library_dirs path.
# However, this might experience linking problems if you require threaded and/or
# gfortran support as the default C-compiler will not necessarily add correct
# link paths.
# To force numpy to disregard direct checking you can add this option to the
# openblas section:
# [openblas]
# embedded_lapack = True
# which will disable the check. If you experience later linker problems you have
# errors elsewhere.
# If it is False it will check for embedded lapack manually.
#
# http://docs.python.org/3.4/library/multiprocessing.html#contexts-and-start-methods
# https://github.com/xianyi/OpenBLAS/issues/294
#
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