Add scipy-openblas support

Currently bundles the header because of
MacPython/openblas-libs#163

.github/workflows/core.yml

@@ -23,15 +23,17 @@ jobs:
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
+        pip install scipy-openblas64
         pip install pytest-xdist
-        sudo apt install libopenblas-dev ${{ matrix.cpp-version }}
+        sudo apt install ${{ matrix.cpp-version }}
         if test ${{ matrix.python-version }} != 'pypy-3.9'; then pip install scipy ; fi
     - name: Setup
       run: |
         python -m pip install .
         python -m pip install . 'pythran[test]'
-        printf '[compiler]\nblas=openblas\n' > ~/.config/.pythranrc
-        printf 'cflags=-std=c++11 -Wall -Werror -Wno-unknown-pragmas -Wno-unused-local-typedefs -Wno-cpp -Wno-deprecated-declarations -Wno-absolute-value -Wno-parentheses-equality\n' >> ~/.config/.pythranrc
+        printf '[compiler]\nblas=scipy-openblas\n' > ~/.config/.pythranrc
+        printf 'cflags=-std=c++11 -Wall -Werror -Wno-unknown-pragmas -Wno-unused-local-typedefs -Wno-cpp -Wno-deprecated-declarations' >> ~/.config/.pythranrc
+        if test "${{ matrix.cpp-version }}" = "clang-7" ; then printf -- " -Wno-absolute-value -Wno-parentheses-equality\n" ; else printf "\n" ; fi >> ~/.config/.pythranrc
     - name: Testing minimal CLI
       run: |
         pythran --version

docs/MANUAL.rst

@@ -591,9 +591,9 @@ loaded. This can be helpful for reproducible builds.
 All the options in the ``.pythranrc`` file can be specified when running pythran by using the command line argument --config= .
 For example::
 
-    pythran --config compiler.blas=pythran-openblas this_file.py
+    pythran --config compiler.blas=scipy-openblas this_file.py
 
-would specify that pythran-openblas is the blas library to use.
+would specify that ``scipy-openblas`` is the blas library to use.
 
 Options specified using command-line arguments override the options found in the ``.pythranrc`` file
 
@@ -648,15 +648,17 @@ This section contains compiler flags configuration. For education purpose, the d
 
 :``blas``:
 
-    BLAS library to use. ``none``, ``pythran-openblas``, ``blas``,
-    ``openblas``, ``atlas`` or ``mkl`` are viable choices.
-    ``none`` prevents from linking with blas.
-    ``pythran-openblas`` requires the `pythran-openblas
-    <https://pypi.org/project/pythran-openblas/>`_ package, which provides a
-    statically linked version of `OpenBLAS <https://www.openblas.net/>`_. Other
-    options are system dependant. Depending on your setup, you *may* need to
-    update ``include_dirs`` to point to the location of the BLAS headers, e.g.
-    ``/usr/include/openblas``.
+    BLAS library to use. ``none``, ``scipy-openblas``, ``pythran-openblas``,
+    ``blas``, ``openblas``, ``atlas`` or ``mkl`` are viable choices.  ``none``
+    prevents from linking with blas. ``scipy-openblas`` requires the
+    `scipy-openblas64 <https://pypi.org/project/scipy-openblas64/>`_ package,
+    which provides a prepcompiled version of `OpenBLAS
+    <https://www.openblas.net/>`_.  ``pythran-openblas`` requires the
+    `pythran-openblas <https://pypi.org/project/pythran-openblas/>`_ package,
+    which provides a statically linked version of `OpenBLAS
+    <https://www.openblas.net/>`_. Other options are system dependant. Depending
+    on your setup, you *may* need to update ``include_dirs`` to point to the
+    location of the BLAS headers, e.g.  ``/usr/include/openblas``.
 
 :``ignoreflags``:
 

pythran/config.py

@@ -231,7 +231,7 @@ def parse_define(define):
         extension['include_dirs'].append(numpy.get_include())
 
     # blas dependency
-    reserved_blas_entries = 'pythran-openblas', 'none'
+    reserved_blas_entries = 'scipy-openblas', 'pythran-openblas', 'none'
     user_blas = cfg.get('compiler', 'blas')
     if user_blas == 'pythran-openblas':
         try:
@@ -247,6 +247,21 @@ def parse_define(define):
                            "Please install it or change the compiler.blas "
                            "setting. Defaulting to 'none'")
             user_blas = 'none'
+    elif user_blas == 'scipy-openblas':
+        try:
+            import scipy_openblas64 as openblas
+            # required to cope with atlas missing extern "C"
+            extension['define_macros'].append('PYTHRAN_BLAS_SCIPY_OPENBLAS')
+            extension['include_dirs'].append(openblas.get_include_dir())
+            extension['library_dirs'].append(openblas.get_lib_dir())
+            extension['libraries'].append(openblas.get_library())
+            extension['extra_link_args'].append("-Wl,-rpath=" + openblas.get_lib_dir())
+        except ImportError:
+            logger.warning("Failed to find 'scipy-openblas64' package. "
+                           "Please install it or change the compiler.blas "
+                           "setting. Defaulting to 'none'")
+            user_blas = 'none'
+
 
     if user_blas == 'none':
         extension['define_macros'].append('PYTHRAN_BLAS_NONE')