reclaimed the = sign. Architectures now specified by +arch= instead. Decided to prepend flag names with + for clarity in spec names and ease of parsing. Also generalized variants, although there is not yet a way to specify a generalized (name=value) variant.

var/spack/mock_packages/multimethod/package.py

@@ -103,19 +103,19 @@ def has_a_default(self):
     #
     # Make sure we can switch methods on different architectures
     #
-    @when('=x86_64')
+    @when('+arch=x86_64')
     def different_by_architecture(self):
         return 'x86_64'
 
-    @when('=ppc64')
+    @when('+arch=ppc64')
     def different_by_architecture(self):
         return 'ppc64'
 
-    @when('=ppc32')
+    @when('+arch=ppc32')
     def different_by_architecture(self):
         return 'ppc32'
 
-    @when('=arm64')
+    @when('+arch=arm64')
     def different_by_architecture(self):
         return 'arm64'