test manual gcc-9 tweak

Author: perazz

.github/workflows/CI.yml

@@ -51,6 +51,12 @@ jobs:
         ln -s /usr/local/bin/gfortran-${GCC_V} /usr/local/bin/gfortran
         which gfortran-${GCC_V}
         which gfortran
+        # Backport gfortran shared libraries to version 9 folder (hardcoded in fpm 0.3.0 executable)
+        ln -fs /usr/local/opt/gcc@${GCC_V}/lib/gcc/${GCC_V}/libquadmath.0.dylib /usr/local/opt/gcc@9/lib/gcc/9/libquadmath.0.dylib 
+        ln -fs /usr/local/opt/gcc@${GCC_V}/lib/gcc/${GCC_V}/libgfortran.5.dylib /usr/local/opt/gcc@9/lib/gcc/9/libgfortran.5.dylib
+        ln -fs /usr/local/lib/gcc/${GCC_V}/libgcc_s.1.dylib /usr/local/lib/gcc/9/libgcc_s.1.dylib
+
+/usr/local/opt/gcc@9/lib/gcc/9/libquadmath.0.dylib
 
     - name: Install GFortran Linux
       if: contains(matrix.os, 'ubuntu')