ObjectiveC. produce more expressive warning when

-Wselector detects an unimplemented method used
in an @selector expression. // rdar://15781538

llvm-svn: 199255

clang/include/clang/Basic/DiagnosticSemaKinds.td

@@ -855,7 +855,8 @@ def warn_auto_implicit_atomic_property : Warning<
   "property is assumed atomic when auto-synthesizing the property">,
   InGroup<ImplicitAtomic>, DefaultIgnore;
 def warn_unimplemented_selector:  Warning<
-  "creating selector for nonexistent method %0">, InGroup<Selector>, DefaultIgnore;
+  "using @selector on method %0 with no implementation in translation unit">, 
+  InGroup<Selector>, DefaultIgnore;
 def warn_unimplemented_protocol_method : Warning<
   "method %0 in protocol %1 not implemented">, InGroup<Protocol>;
 

clang/test/PCH/chain-selectors.m

@@ -18,9 +18,9 @@ void bar() {
   // FIXME: Can't verify notes in headers
   //[a f2];
 
-  (void)@selector(x); // expected-warning {{creating selector for nonexistent method 'x'}}
-  (void)@selector(y); // expected-warning {{creating selector for nonexistent method 'y'}}
-  (void)@selector(e); // expected-warning {{creating selector for nonexistent method 'e'}}
+  (void)@selector(x); // expected-warning {{using @selector on method 'x' with no implementation in translation unit}}
+  (void)@selector(y); // expected-warning {{using @selector on method 'y' with no implementation in translation unit}}
+  (void)@selector(e); // expected-warning {{using @selector on method 'e' with no implementation in translation unit}}
 }
 
 @implementation X (Blah)

clang/test/SemaObjC/selector-3.m

@@ -14,7 +14,7 @@
 - (void) foo
 {
   SEL a,b,c;
-  a = @selector(b1ar);  // expected-warning {{creating selector for nonexistent method 'b1ar'}}
+  a = @selector(b1ar);  // expected-warning {{using @selector on method 'b1ar' with no implementation in translation unit}}
   b = @selector(bar);
 }
 @end
@@ -25,7 +25,7 @@
 
 SEL func()
 {
-    return  @selector(length);  // expected-warning {{creating selector for nonexistent method 'length'}}
+    return  @selector(length);  // expected-warning {{using @selector on method 'length' with no implementation in translation unit}}
 }
 
 // rdar://9545564
@@ -69,7 +69,7 @@ extern SEL MySelector(SEL s);
 
 @implementation INTF
 - (void) Meth {
-  if( [cnx respondsToSelector:MySelector(@selector( _setQueue: ))] ) // expected-warning {{creating selector for nonexistent method '_setQueue:'}} 
+  if( [cnx respondsToSelector:MySelector(@selector( _setQueue: ))] ) // expected-warning {{using @selector on method '_setQueue:' with no implementation in translation unit}}
   {
   }