use gfortran-11 on macos-15-intel native build

Author: mattip

.github/workflows/posix.yml

@@ -28,8 +28,8 @@ jobs:
           - { os: ubuntu-latest, PLAT: x86_64, INTERFACE64: '0', MB_ML_VER: '2014', MB_ML_LIBC: manylinux}
           - { os: ubuntu-latest, PLAT: x86_64, INTERFACE64: '1', MB_ML_VER: '2014', MB_ML_LIBC: manylinux}
 
-          - { os: macos-latest, PLAT: x86_64, INTERFACE64: '0', MB_ML_LIBC: macosx}
-          - { os: macos-latest, PLAT: x86_64, INTERFACE64: '1', MB_ML_LIBC: macosx}
+          - { os: macos-15-intel, PLAT: x86_64, INTERFACE64: '0', MB_ML_LIBC: macosx}
+          - { os: macos-15-intel, PLAT: x86_64, INTERFACE64: '1', MB_ML_LIBC: macosx}
 
           - { os: macos-latest, PLAT: arm64, INTERFACE64: '0', MB_ML_LIBC: macosx}
           - { os: macos-latest, PLAT: arm64, INTERFACE64: '1', MB_ML_LIBC: macosx}

.gitmodules

@@ -1,3 +1,6 @@
 [submodule "OpenBLAS"]
 	path = OpenBLAS
 	url = https://github.com/xianyi/OpenBLAS.git
+[submodule "gfortran-install"]
+	path = gfortran-install
+	url = https://github.com/MacPython/gfortran-install.git

gfortran-install

@@ -9,7 +9,7 @@ build-backend = "setuptools.build_meta"
 [project]
 name = "scipy-openblas64"
 # v0.3.30
-version = "0.3.30.0.5"
+version = "0.3.30.0.6"
 requires-python = ">=3.7"
 description = "Provides OpenBLAS for python packaging"
 readme = "README.md"

pyproject.toml

@@ -150,7 +150,14 @@ function do_build_lib {
         Darwin-x86_64)
             local bitness=64
             local target="CORE2"
-            # Pick up the gfortran runtime libraries
+            # Use gfortran-11
+            unalias gfortran
+            # Since install_fortran uses `uname -a` to determine arch,
+            # force the architecture
+            arch -${PLAT} bash -s << EOF
+source ${ROOT_DIR}/gfortran-install/gfortran_utils.sh
+install_gfortran
+EOF
             export DYLD_LIBRARY_PATH=/usr/local/lib:$DYLD_LIBRARY_PATH
             CFLAGS="$CFLAGS -arch x86_64"
             export SDKROOT=${SDKROOT:-$(xcrun --show-sdk-path)}