PR35815: Separate out the ns-consumed diagnostic into an error and

a warning

This commit separates out the warn_nsconsumed_attribute_mismatch and
warn_nsreturns_retained_attribute_mismatch diagnostic into a warning and error.
This is needed to avoid a module import regression introduced by r313717 that
turned these errors into warnings and started promoting them only when needed,
which caused an error when importing a module as it had different warning
settings.

rdar://36265651

llvm-svn: 321775

clang/include/clang/Basic/DiagnosticSemaKinds.td

@@ -8300,12 +8300,16 @@ def err_c99_array_usage_cxx : Error<
   "feature, not permitted in C++">;
 def err_type_unsupported : Error<
   "%0 is not supported on this target">;
-def warn_nsconsumed_attribute_mismatch : Warning<
+def err_nsconsumed_attribute_mismatch : Error<
   "overriding method has mismatched ns_consumed attribute on its"
-  " parameter">, InGroup<NSConsumedMismatch>;
-def warn_nsreturns_retained_attribute_mismatch : Warning<
+  " parameter">;
+def err_nsreturns_retained_attribute_mismatch : Error<
   "overriding method has mismatched ns_returns_%select{not_retained|retained}0"
-  " attributes">, InGroup<NSReturnsMismatch>;
+  " attributes">;
+def warn_nsconsumed_attribute_mismatch : Warning<
+  err_nsconsumed_attribute_mismatch.Text>, InGroup<NSConsumedMismatch>;
+def warn_nsreturns_retained_attribute_mismatch : Warning<
+  err_nsreturns_retained_attribute_mismatch.Text>, InGroup<NSReturnsMismatch>;
   
 def note_getter_unavailable : Note<
   "or because setter is declared here, but no getter method %0 is found">;

clang/lib/Sema/SemaDeclObjC.cpp

@@ -156,23 +156,23 @@ void Sema::CheckObjCMethodOverride(ObjCMethodDecl *NewMethod,
       Diag(Overridden->getLocation(), 
            diag::note_related_result_type_overridden);
   }
-  if (getLangOpts().ObjCAutoRefCount) {
-    Diags.setSeverity(diag::warn_nsreturns_retained_attribute_mismatch,
-                      diag::Severity::Error, SourceLocation());
-    Diags.setSeverity(diag::warn_nsconsumed_attribute_mismatch,
-                      diag::Severity::Error, SourceLocation());
-  }
 
   if ((NewMethod->hasAttr<NSReturnsRetainedAttr>() !=
        Overridden->hasAttr<NSReturnsRetainedAttr>())) {
     Diag(NewMethod->getLocation(),
-         diag::warn_nsreturns_retained_attribute_mismatch) << 1;
+         getLangOpts().ObjCAutoRefCount
+             ? diag::err_nsreturns_retained_attribute_mismatch
+             : diag::warn_nsreturns_retained_attribute_mismatch)
+        << 1;
     Diag(Overridden->getLocation(), diag::note_previous_decl) << "method";
   }
   if ((NewMethod->hasAttr<NSReturnsNotRetainedAttr>() !=
        Overridden->hasAttr<NSReturnsNotRetainedAttr>())) {
     Diag(NewMethod->getLocation(),
-         diag::warn_nsreturns_retained_attribute_mismatch) << 0;
+         getLangOpts().ObjCAutoRefCount
+             ? diag::err_nsreturns_retained_attribute_mismatch
+             : diag::warn_nsreturns_retained_attribute_mismatch)
+        << 0;
     Diag(Overridden->getLocation(), diag::note_previous_decl)  << "method";
   }
 
@@ -185,7 +185,10 @@ void Sema::CheckObjCMethodOverride(ObjCMethodDecl *NewMethod,
     ParmVarDecl *newDecl = (*ni);
     if (newDecl->hasAttr<NSConsumedAttr>() !=
         oldDecl->hasAttr<NSConsumedAttr>()) {
-      Diag(newDecl->getLocation(), diag::warn_nsconsumed_attribute_mismatch);
+      Diag(newDecl->getLocation(),
+           getLangOpts().ObjCAutoRefCount
+               ? diag::err_nsconsumed_attribute_mismatch
+               : diag::warn_nsconsumed_attribute_mismatch);
       Diag(oldDecl->getLocation(), diag::note_previous_decl) << "parameter";
     }
 

clang/test/SemaObjC/Inputs/module.map

@@ -0,0 +1,3 @@
+module empty {
+  header "empty.h"
+}

clang/test/SemaObjC/ns-consumed-error-not-warning.m

@@ -0,0 +1,13 @@
+// RUN: rm -rf %t
+// RUN: %clang_cc1 -fsyntax-only -fmodules -fimplicit-module-maps -fmodules-cache-path=%t -I %S/Inputs -fobjc-arc -verify -fblocks -triple x86_64-apple-darwin10.0.0 -DOBJCARC %s
+// rdar://36265651
+
+@interface A
+-(void) m:(id)p; // expected-note {{parameter declared here}}
+@end
+
+@interface B : A
+-(void) m:(__attribute__((ns_consumed)) id)p; // expected-error {{overriding method has mismatched ns_consumed attribute on its parameter}}
+@end
+
+@import empty;