Fix for PR7410. Allow functions in a derived class that improperly overwrite a virtual function in the base class to be inserted into the derived class function list to prevent extra errors every time the derived class is used.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@134251 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Sema/SemaDecl.cpp

@@ -4096,10 +4096,10 @@ bool Sema::AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) {
     for (CXXBasePaths::decl_iterator I = Paths.found_decls_begin(),
          E = Paths.found_decls_end(); I != E; ++I) {
       if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) {
+        MD->addOverriddenMethod(OldMD->getCanonicalDecl());
         if (!CheckOverridingFunctionReturnType(MD, OldMD) &&
             !CheckOverridingFunctionExceptionSpec(MD, OldMD) &&
             !CheckIfOverriddenFunctionIsMarkedFinal(MD, OldMD)) {
-          MD->addOverriddenMethod(OldMD->getCanonicalDecl());
           AddedAny = true;
         }
       }

test/SemaCXX/PR7410.cpp

@@ -0,0 +1,13 @@
+// RUN: %clang_cc1 -fsyntax-only -verify %s
+
+struct BaseReturn {};
+
+struct Base {
+  virtual BaseReturn Foo() = 0;  // expected-note{{overridden virtual function is here}}
+};
+struct X {};
+struct Derived : Base {
+  X Foo();  // expected-error{{virtual function 'Foo' has a different return type ('X') than the function it overrides (which has return type 'BaseReturn')}}
+};
+
+Derived d;