Utility to check that preferred compiler is used #1876
Description
Is your feature request related to a problem?
It would be nice to have a utility that checks that the preferred compiler is used to build all packages in an environment, except for packages on an exclude list (those can be built with a different compiler).
Describe the solution you'd like
Create a utility that can be run after spack concretize, similar to the check for duplicates. It should check that all packages except those on an exclude list (probably passed as command line arguments, similar to the duplicates checker) are built with the preferred compiler.
Additional context
n/a