Objective-C. Fixes a bogus warning on unimplemented

selectors because we were not going through entire
elements in list of all implemented selectors. 
// rdar://16428638

llvm-svn: 204852

clang/lib/Sema/SemaDeclObjC.cpp

@@ -2402,11 +2402,15 @@ ObjCMethodDecl *Sema::LookupImplementedMethodInGlobalPool(Selector Sel) {
     return 0;
 
   GlobalMethods &Methods = Pos->second;
+  for (const ObjCMethodList *Method = &Methods.first; Method;
+       Method = Method->getNext())
+    if (Method->Method && Method->Method->isDefined())
+      return Method->Method;
   
-  if (Methods.first.Method && Methods.first.Method->isDefined())
-    return Methods.first.Method;
-  if (Methods.second.Method && Methods.second.Method->isDefined())
-    return Methods.second.Method;
+  for (const ObjCMethodList *Method = &Methods.second; Method;
+       Method = Method->getNext())
+    if (Method->Method && Method->Method->isDefined())
+      return Method->Method;
   return 0;
 }
 

clang/test/SemaObjC/selector-3.m

@@ -110,3 +110,27 @@ extern SEL MySelector(SEL s);
 @interface USETextSub : USEText
 - (int) invalidate : (id)arg;
 @end
+
+// rdar://16428638
+@interface I16428638
+- (int) compare: (I16428638 *) arg1; // commenting out this line avoids the warning
+@end
+
+@interface J16428638
+- (int) compare: (J16428638 *) arg1;
+@end
+
+@implementation J16428638
+- (void)method {
+    SEL s = @selector(compare:); // spurious warning
+    (void)s;
+}
+- (int) compare: (J16428638 *) arg1 {
+    return 0;
+}
+@end
+
+void test16428638() {
+    SEL s = @selector(compare:);
+    (void)s;
+}