nixpkgs/pkgs/development/python-modules/numpy-scipy-support.nix

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{
# Python package expression
python,
# Name of package (e.g. numpy or scipy)
pkgName,
# OpenBLAS math library
openblas
}:
{
# Re-export openblas here so that it can be sure that the same one will be used
# in the propagatedBuildInputs.
inherit openblas;
# First "install" the package, then import what was installed, and call the
# .test() function, which will run the test suite.
checkPhase = ''
runHook preCheck
_python=${python}/bin/${python.executable}
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# We will "install" into a temp directory, so that we can run the
# tests (see below).
install_dir="$TMPDIR/test_install"
install_lib="$install_dir/lib/${python.libPrefix}/site-packages"
mkdir -p $install_dir
$_python setup.py install \
--install-lib=$install_lib \
--old-and-unmanageable \
--prefix=$install_dir > /dev/null
# Create a directory in which to run tests (you get an error if you try to
# import the package when you're in the current directory).
mkdir $TMPDIR/run_tests
pushd $TMPDIR/run_tests > /dev/null
# Temporarily add the directory we installed in to the python path
# (not permanently, or this pythonpath will wind up getting exported),
# and run the test suite.
PYTHONPATH="$install_lib:$PYTHONPATH" $_python -c \
'import ${pkgName}; ${pkgName}.test("fast", verbose=10)'
popd > /dev/null
runHook postCheck
'';
# Creates a site.cfg telling the setup script where to find depended-on
# math libraries.
preBuild = ''
echo "Creating site.cfg file..."
cat << EOF > site.cfg
[openblas]
include_dirs = ${openblas}/include
library_dirs = ${openblas}/lib
EOF
'';
}