Move -Wswitch-enum to -Wswitch

This matches GCC's documented (& actual) behavior. What Clang had implemented
as -Wswitch-enum was actually GCC's -Wswitch behavior. -Wswitch is on by
default (part of -Wall) and warns if a switch-over-enum, without a default
case, covers all enum values.

-Wswitch-enum, on the other hand, does not have the default clause and should
fire even in the presence of a default. This warning is off by default.

With this change the -Wswitch-enum flag is off-by-default in Clang but has no
functionality at the moment. I'll add that in a future commit.

llvm-svn: 148648

clang/include/clang/Basic/DiagnosticGroups.td

@@ -178,9 +178,9 @@ def InvalidOffsetof : DiagGroup<"invalid-offsetof">;
 def : DiagGroup<"strict-prototypes">;
 def StrictSelector : DiagGroup<"strict-selector-match">;
 def MethodDuplicate : DiagGroup<"duplicate-method-match">;
+def SwitchEnum     : DiagGroup<"switch-enum">;
 def SwitchEnumRedundantDefault : DiagGroup<"switch-enum-redundant-default">;
-def SwitchEnum     : DiagGroup<"switch-enum", [SwitchEnumRedundantDefault]>;
-def Switch         : DiagGroup<"switch", [SwitchEnum]>;
+def Switch         : DiagGroup<"switch", [SwitchEnumRedundantDefault]>;
 def Trigraphs      : DiagGroup<"trigraphs">;
 
 def : DiagGroup<"type-limits">;

clang/include/clang/Basic/DiagnosticSemaKinds.td

@@ -4946,22 +4946,22 @@ def warn_case_empty_range : Warning<"empty case range specified">;
 def warn_missing_case_for_condition :
   Warning<"no case matching constant switch condition '%0'">;
 def warn_missing_case1 : Warning<"enumeration value %0 not handled in switch">,
-  InGroup<SwitchEnum>;
+  InGroup<Switch>;
 def warn_missing_case2 : Warning<
   "enumeration values %0 and %1 not handled in switch">,
-  InGroup<SwitchEnum>;
+  InGroup<Switch>;
 def warn_missing_case3 : Warning<
   "enumeration values %0, %1, and %2 not handled in switch">,
-  InGroup<SwitchEnum>;
+  InGroup<Switch>;
 def warn_missing_cases : Warning<
   "%0 enumeration values not handled in switch: %1, %2, %3...">,
-  InGroup<SwitchEnum>;
+  InGroup<Switch>;
 def warn_unreachable_default : Warning<
   "default is unreachable as all enumeration values are accounted for">,
   InGroup<SwitchEnumRedundantDefault>;
 
 def warn_not_in_enum : Warning<"case value not in enumerated type %0">,
-  InGroup<SwitchEnum>; 
+  InGroup<Switch>; 
 def err_typecheck_statement_requires_scalar : Error<
   "statement requires expression of scalar type (%0 invalid)">;
 def err_typecheck_statement_requires_integer : Error<

clang/test/SemaCXX/switch.cpp

@@ -1,4 +1,4 @@
-// RUN: %clang_cc1 -fsyntax-only -verify -Wswitch-enum %s
+// RUN: %clang_cc1 -fsyntax-only -verify %s
 
 void test() {
   bool x = true;