use clang only on qemu platforms

Author: mattip

.github/workflows/posix.yml

@@ -62,9 +62,7 @@ jobs:
       MB_ML_LIBC: ${{ matrix.MB_ML_LIBC }}
       MB_ML_VER: ${{ matrix.MB_ML_VER }}
       INTERFACE64: ${{ matrix.INTERFACE64 }}
-      BUILD_DIR: ${{ github.workspace }}
       PLAT: ${{ matrix.PLAT }}
-      OS-NAME: ${{ matrix.os }}
 
     steps:
     - uses: actions/checkout@v6.0.1

ci-before-build.sh

@@ -24,10 +24,15 @@ fi
 sed -e "s/^VERSION = .*/VERSION = ${version}/" -i.bak OpenBLAS/Makefile.rule
 echo "creating wheel from $OPENBLAS_COMMIT (NIGHTLY is $NIGHTLY)"
 
-if [ "$(uname)" != "Darwin" ]; then
-  ./tools/install-static-clang.sh
-  export PATH=/opt/clang/bin:$PATH
-fi
+case "$PLAT" in
+    ppc64le|s390x|riscv64)
+        ./tools/install-static-clang.sh
+        export PATH=/opt/clang/bin:$PATH
+        CC="/opt/clang/bin/clang"
+        CXX="/opt/clang/bin/clang++"
+        LDFLAGS="-fuse-ld=lld"
+        ;;
+esac
 
 # Build OpenBLAS
 source build-openblas.sh

pyproject.toml

@@ -54,8 +54,5 @@ environment-pass = [
   "OS-NAME",
   "RUNNER_ARCH",
 ]
-[tool.cibuildwheel.linux]
-environment = { CC = "/opt/clang/bin/clang", CXX = "/opt/clang/bin/clang++", LDFLAGS = "-fuse-ld=lld" }
-
 [project.entry-points.pkg_config]
 scipy-openblas = 'scipy_openblas64.lib.pkgconfig'