Darwin/arm64: disable SVE/SME and fix gfortran link path

Author: abhishek-iitmadras

.github/workflows/apple_m.yml

@@ -87,10 +87,16 @@ jobs:
           echo "max_size = 300M" > ~/.ccache/ccache.conf
           echo "compression = true" >> ~/.ccache/ccache.conf
           ccache -s
+          
+      - name: Add gfortran runtime to link path
+        if: matrix.build == 'make' && runner.os == 'macOS'
+        run: |
+          GFORTRAN_LIBDIR=$(gfortran -print-file-name=libgfortran.dylib | xargs dirname)
+          echo "Using gfortran runtime in $GFORTRAN_LIBDIR"
+          echo "LDFLAGS=-L/opt/homebrew/opt/llvm/lib -L$GFORTRAN_LIBDIR" >> $GITHUB_ENV
 
       - name: Build OpenBLAS
         run: |
-          export LDFLAGS="-L/opt/homebrew/opt/llvm/lib"
           export CPPFLAGS="-I/opt/homebrew/opt/llvm/include"
           export CC="/opt/homebrew/opt/llvm/bin/clang"
           case "${{ matrix.build }}" in

Makefile.system

@@ -426,10 +426,8 @@ ifeq ($(OSNAME), Darwin)
 ifndef MACOSX_DEPLOYMENT_TARGET
 ifeq ($(ARCH), arm64)
 export MACOSX_DEPLOYMENT_TARGET=11.0
-ifeq ($(C_COMPILER), GCC)
 export NO_SVE = 1
 export NO_SME = 1
-endif
 else
 export MACOSX_DEPLOYMENT_TARGET=10.8
 endif