Index: lib/AST/ASTImporter.cpp
===================================================================
--- lib/AST/ASTImporter.cpp
+++ lib/AST/ASTImporter.cpp
@@ -2955,7 +2955,7 @@
           continue;
 
         // Complain about inconsistent function types.
-        Importer.ToDiag(Loc, diag::err_odr_function_type_inconsistent)
+        Importer.ToDiag(Loc, diag::warn_odr_function_type_inconsistent)
             << Name << D->getType() << FoundFunction->getType();
         Importer.ToDiag(FoundFunction->getLocation(), diag::note_odr_value_here)
             << FoundFunction->getType();
@@ -3259,7 +3259,7 @@
       }
 
       // FIXME: Why is this case not handled with calling HandleNameConflict?
-      Importer.ToDiag(Loc, diag::err_odr_field_type_inconsistent)
+      Importer.ToDiag(Loc, diag::warn_odr_field_type_inconsistent)
         << Name << D->getType() << FoundField->getType();
       Importer.ToDiag(FoundField->getLocation(), diag::note_odr_value_here)
         << FoundField->getType();
@@ -3330,7 +3330,7 @@
         continue;
 
       // FIXME: Why is this case not handled with calling HandleNameConflict?
-      Importer.ToDiag(Loc, diag::err_odr_field_type_inconsistent)
+      Importer.ToDiag(Loc, diag::warn_odr_field_type_inconsistent)
         << Name << D->getType() << FoundField->getType();
       Importer.ToDiag(FoundField->getLocation(), diag::note_odr_value_here)
         << FoundField->getType();
@@ -3461,7 +3461,7 @@
         return FoundIvar;
       }
 
-      Importer.ToDiag(Loc, diag::err_odr_ivar_type_inconsistent)
+      Importer.ToDiag(Loc, diag::warn_odr_ivar_type_inconsistent)
         << Name << D->getType() << FoundIvar->getType();
       Importer.ToDiag(FoundIvar->getLocation(), diag::note_odr_value_here)
         << FoundIvar->getType();
@@ -3574,7 +3574,7 @@
           }
         }
 
-        Importer.ToDiag(Loc, diag::err_odr_variable_type_inconsistent)
+        Importer.ToDiag(Loc, diag::warn_odr_variable_type_inconsistent)
           << Name << D->getType() << FoundVar->getType();
         Importer.ToDiag(FoundVar->getLocation(), diag::note_odr_value_here)
           << FoundVar->getType();
@@ -3739,7 +3739,7 @@
       // Check return types.
       if (!Importer.IsStructurallyEquivalent(D->getReturnType(),
                                              FoundMethod->getReturnType())) {
-        Importer.ToDiag(Loc, diag::err_odr_objc_method_result_type_inconsistent)
+        Importer.ToDiag(Loc, diag::warn_odr_objc_method_result_type_inconsistent)
             << D->isInstanceMethod() << Name << D->getReturnType()
             << FoundMethod->getReturnType();
         Importer.ToDiag(FoundMethod->getLocation(),
@@ -3751,7 +3751,7 @@
 
       // Check the number of parameters.
       if (D->param_size() != FoundMethod->param_size()) {
-        Importer.ToDiag(Loc, diag::err_odr_objc_method_num_params_inconsistent)
+        Importer.ToDiag(Loc, diag::warn_odr_objc_method_num_params_inconsistent)
           << D->isInstanceMethod() << Name
           << D->param_size() << FoundMethod->param_size();
         Importer.ToDiag(FoundMethod->getLocation(),
@@ -3768,7 +3768,7 @@
         if (!Importer.IsStructurallyEquivalent((*P)->getType(),
                                                (*FoundP)->getType())) {
           Importer.FromDiag((*P)->getLocation(),
-                            diag::err_odr_objc_method_param_type_inconsistent)
+                            diag::warn_odr_objc_method_param_type_inconsistent)
             << D->isInstanceMethod() << Name
             << (*P)->getType() << (*FoundP)->getType();
           Importer.ToDiag((*FoundP)->getLocation(), diag::note_odr_value_here)
@@ -3781,7 +3781,7 @@
       // Check variadic/non-variadic.
       // Check the number of parameters.
       if (D->isVariadic() != FoundMethod->isVariadic()) {
-        Importer.ToDiag(Loc, diag::err_odr_objc_method_variadic_inconsistent)
+        Importer.ToDiag(Loc, diag::warn_odr_objc_method_variadic_inconsistent)
           << D->isInstanceMethod() << Name;
         Importer.ToDiag(FoundMethod->getLocation(),
                         diag::note_odr_objc_method_here)
@@ -4326,7 +4326,7 @@
     if ((bool)FromSuper != (bool)ToSuper ||
         (FromSuper && !declaresSameEntity(FromSuper, ToSuper))) {
       Importer.ToDiag(To->getLocation(),
-                      diag::err_odr_objc_superclass_inconsistent)
+                      diag::warn_odr_objc_superclass_inconsistent)
         << To->getDeclName();
       if (ToSuper)
         Importer.ToDiag(To->getSuperClassLoc(), diag::note_odr_objc_superclass)
@@ -4595,7 +4595,7 @@
          !declaresSameEntity(Super->getCanonicalDecl(),
                              Impl->getSuperClass()))) {
       Importer.ToDiag(Impl->getLocation(),
-                      diag::err_odr_objc_superclass_inconsistent)
+                      diag::warn_odr_objc_superclass_inconsistent)
         << Iface->getDeclName();
       // FIXME: It would be nice to have the location of the superclass
       // below.
@@ -4643,7 +4643,7 @@
       // Check property types.
       if (!Importer.IsStructurallyEquivalent(D->getType(),
                                              FoundProp->getType())) {
-        Importer.ToDiag(Loc, diag::err_odr_objc_property_type_inconsistent)
+        Importer.ToDiag(Loc, diag::warn_odr_objc_property_type_inconsistent)
           << Name << D->getType() << FoundProp->getType();
         Importer.ToDiag(FoundProp->getLocation(), diag::note_odr_value_here)
           << FoundProp->getType();
@@ -4750,7 +4750,7 @@
     // vs. @dynamic).
     if (D->getPropertyImplementation() != ToImpl->getPropertyImplementation()) {
       Importer.ToDiag(ToImpl->getLocation(),
-                      diag::err_odr_objc_property_impl_kind_inconsistent)
+                      diag::warn_odr_objc_property_impl_kind_inconsistent)
         << Property->getDeclName()
         << (ToImpl->getPropertyImplementation()
                                               == ObjCPropertyImplDecl::Dynamic);
@@ -4766,7 +4766,7 @@
     if (D->getPropertyImplementation() == ObjCPropertyImplDecl::Synthesize &&
         Ivar != ToImpl->getPropertyIvarDecl()) {
       Importer.ToDiag(ToImpl->getPropertyIvarDeclLoc(),
-                      diag::err_odr_objc_synthesize_ivar_inconsistent)
+                      diag::warn_odr_objc_synthesize_ivar_inconsistent)
         << Property->getDeclName()
         << ToImpl->getPropertyIvarDecl()->getDeclName()
         << Ivar->getDeclName();