BLD: start openblas wheel in cibuildwheel [wheel build][skip cirrus]

.github/workflows/wheels.yml

@@ -37,7 +37,7 @@ jobs:
   get_commit_message:
     name: Get commit message
     runs-on: ubuntu-latest
-    if: github.repository == 'scipy/scipy'
+    if: github.repository == 'andyfaff/scipy'
     outputs:
       message: ${{ steps.commit_message.outputs.message }}
     steps:

pyproject.toml

@@ -131,6 +131,8 @@ test-command = "bash {project}/tools/wheels/cibw_test_command.sh {project}"
 manylinux-x86_64-image = "manylinux2014"
 manylinux-aarch64-image = "manylinux2014"
 before-build = "bash {project}/tools/wheels/cibw_before_build_linux.sh {project}"
+environment = { PKG_CONFIG_PATH="$PWD/.openblas" }
+
 
 [tool.cibuildwheel.macos]
 before-build = "bash {project}/tools/wheels/cibw_before_build_macos.sh {project}"

tools/wheels/cibw_before_build_linux.sh

@@ -12,14 +12,13 @@ else
     echo "Usage: $0 [--nightly] <project_dir>"
     exit 1
 fi
-
-PLATFORM=$(PYTHONPATH=tools python -c "import openblas_support; print(openblas_support.get_plat())")
-
 printenv
 # Update license
 cat $PROJECT_DIR/tools/wheels/LICENSE_linux.txt >> $PROJECT_DIR/LICENSE.txt
 
-# Install Openblas
-basedir=$(python tools/openblas_support.py $NIGHTLY_FLAG)
-cp -r $basedir/lib/* /usr/local/lib
-cp $basedir/include/* /usr/local/include
+if [ NIGHTLY_FLAG=="--nightly"];then
+  python -m pip install --pre --upgrade --timeout=60 -i https://pypi.anaconda.org/scientific-python-nightly-wheels/simple scipy-openblas32
+else
+  python -m pip install scipy_openblas32
+fi
+PYTHONPATH=tools/wheels python -c "import openblas; openblas.configure_scipy_openblas()"

tools/wheels/openblas.py

@@ -0,0 +1,25 @@
+import os
+import importlib
+
+
+def configure_scipy_openblas(blas_variant='32'):
+    """Create .openblas/scipy-openblas.pc
+
+    Requires a pre-installed scipy-openblas32 wheel from PyPI.
+    """
+    basedir = os.getcwd()
+    openblas_dir = os.path.join(basedir, ".openblas")
+    pkg_config_fname = os.path.join(openblas_dir, "scipy-openblas.pc")
+
+    if os.path.exists(pkg_config_fname):
+        return None
+
+    module_name = f"scipy_openblas{blas_variant}"
+    try:
+        openblas = importlib.import_module(module_name)
+    except ModuleNotFoundError:
+        raise RuntimeError(f"'pip install {module_name} first")
+
+    os.makedirs(openblas_dir, exist_ok=True)
+    with open(pkg_config_fname, "wt", encoding="utf8") as fid:
+        fid.write(openblas.get_pkg_config().replace("\\", "/"))