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fix detection of math library in numpy build #3520

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fix detection of math library in numpy build #3520

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b0f4de0
fix detection of math library in numpy build
Flamefire Nov 28, 2024
259051b
Remove `numpy_version` variable again
Flamefire Nov 28, 2024
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9 changes: 9 additions & 0 deletions easybuild/easyblocks/n/numpy.py
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Original file line number Diff line number Diff line change
Expand Up @@ -204,6 +204,15 @@ def get_libs_for_mkl(varname):
'includes': includes,
}

if LooseVersion(self.version) < LooseVersion('1.26'):
# NumPy detects the required math by trying to link a minimal code containing a call to `log(0.)`.
# The first try is without any libraries, which works with `gcc -fno-math-errno` (our optimization default)
# because the call gets removed due to not having any effect. So it concludes that `-lm` is not required.
# This then fails to detect availability of functions such as `acosh` which do not get removed in the same
# way and so less exact replacements are used instead which e.g. fail the tests on PPC.
# This variable makes it try `-lm` first and is supported until the Meson backend is used in 1.26+.
env.setvar('MATHLIB', 'm')

super(EB_numpy, self).configure_step()

if LooseVersion(self.version) < LooseVersion('1.21'):
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