Move the "used but marked unused" warning behind a special warning flag for now.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@117219 91177308-0d34-0410-b5e6-96231b3b80d8

clang.xcodeproj/project.pbxproj

@@ -2039,6 +2039,7 @@
 			isa = PBXProject;
 			buildConfigurationList = 1DEB923508733DC60010E9CD /* Build configuration list for PBXProject "clang" */;
 			compatibilityVersion = "Xcode 2.4";
+			developmentRegion = English;
 			hasScannedForEncodings = 1;
 			knownRegions = (
 				English,

include/clang/Basic/DiagnosticGroups.td

@@ -142,6 +142,7 @@ def UnusedLabel : DiagGroup<"unused-label">;
 def UnusedParameter : DiagGroup<"unused-parameter">;
 def UnusedValue    : DiagGroup<"unused-value">;
 def UnusedVariable : DiagGroup<"unused-variable">;
+def UsedBytMarkedUnused : DiagGroup<"used-but-marked-unused">;
 def ReadOnlySetterAttrs : DiagGroup<"readonly-setter-attrs">;
 def Reorder : DiagGroup<"reorder">;
 def UndeclaredSelector : DiagGroup<"undeclared-selector">;

include/clang/Basic/DiagnosticSemaKinds.td

@@ -109,7 +109,7 @@ def warn_unused_function : Warning<"unused function %0">,
 def warn_unused_member_function : Warning<"unused member function %0">,
   InGroup<UnusedMemberFunction>, DefaultIgnore;
 def warn_used_but_marked_unused: Warning<"%0 was marked unused but was used">,
-  InGroup<Unused>;
+  InGroup<UsedBytMarkedUnused>, DefaultIgnore;
 
 def warn_implicit_function_decl : Warning<
   "implicit declaration of function %0">,

test/Sema/attr-unused.c

@@ -1,4 +1,4 @@
-// RUN: %clang_cc1 -verify -Wunused -Wunused-parameter -Wunused -fsyntax-only %s
+// RUN: %clang_cc1 -verify -Wunused -Wused-but-marked-unused -Wunused-parameter -Wunused -fsyntax-only %s
 
 static void (*fp0)(void) __attribute__((unused));
 

test/Sema/pragma-unused.c

@@ -1,4 +1,4 @@
-// RUN: %clang_cc1 -fsyntax-only -Wunused-parameter -verify %s
+// RUN: %clang_cc1 -fsyntax-only -Wunused-parameter -Wused-but-marked-unused -verify %s
 
 void f1(void) {
   int x, y, z;