Factor out more option iterating

mesonbuild/coredata.py

@@ -483,8 +483,13 @@ class CoreData:
         yield self.compiler_options
         yield self.base_options
 
+    def get_all_options(self):
+        return chain(
+            iter([self.builtins]),
+            self._get_all_nonbuiltin_options())
+
     def validate_option_value(self, option_name, override_value):
-        for opts in chain(iter([self.builtins]), self._get_all_nonbuiltin_options()):
+        for opts in self.get_all_options():
             if option_name in opts:
                 opt = opts[option_name]
                 return opt.validate_value(override_value)

mesonbuild/interpreter.py

@@ -1957,10 +1957,7 @@ class Interpreter(InterpreterBase):
     def get_non_matching_default_options(self):
         env = self.environment
         for def_opt_name, def_opt_value in self.project_default_options.items():
-            for option_type in [
-                    env.coredata.builtins, env.coredata.compiler_options,
-                    env.coredata.backend_options, env.coredata.base_options,
-                    env.coredata.user_options]:
+            for option_type in env.coredata.get_all_options():
                 for cur_opt_name, cur_opt_value in option_type.items():
                     if (def_opt_name == cur_opt_name and
                             def_opt_value != cur_opt_value.value):