modules : it's possible to add suffixes to module files based on constraint

lib/spack/spack/config.py

@@ -287,6 +287,7 @@
                     'prerequisites': {'$ref': '#/definitions/dependency_selection'},
                     'conflict': {'$ref': '#/definitions/array_of_strings'},
                     'load': {'$ref': '#/definitions/array_of_strings'},
+                    'suffixes': {'$ref': '#/definitions/dictionary_of_strings'},
                     'environment': {
                         'type': 'object',
                         'default': {},

lib/spack/spack/modules.py

@@ -285,11 +285,18 @@ def use_name(self):
         naming_tokens = self.tokens
         naming_scheme = self.naming_scheme
         name = naming_scheme.format(**naming_tokens)
-        name += '-' + self.spec.dag_hash(
-        )  # Always append the hash to make the module file unique
         # Not everybody is working on linux...
         parts = name.split('/')
         name = join_path(*parts)
+        # Add optional suffixes based on constraints
+        configuration, _ = parse_config_options(self)
+        suffixes = [name]
+        for constraint, suffix in configuration.get('suffixes', {}).items():
+            if constraint in self.spec:
+                suffixes.append(suffix)
+        # Always append the hash to make the module file unique
+        suffixes.append(self.spec.dag_hash())
+        name = '-'.join(suffixes)
         return name
 
     @property