document change

Author: perazz

.github/workflows/CI.yml

@@ -51,7 +51,9 @@ 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)
+        # Backport gfortran shared libraries to version 9 folder. This is necessary because all macOS releases of fpm 
+        # have these paths hardcoded in the executable (no PIC?). As the gcc ABIs have not changed from 9 to 10, we 
+        # can just create symbolic links for now. This can be removed when an updated fpm release is built with gcc-10  
         mkdir /usr/local/opt/gcc@9
         mkdir /usr/local/opt/gcc@9/lib
         mkdir /usr/local/opt/gcc@9/lib/gcc