Fix PR12608. Patch contributed by Yang Chen.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@155355 91177308-0d34-0410-b5e6-96231b3b80d8

include/clang/AST/RecursiveASTVisitor.h

@@ -1567,7 +1567,7 @@ bool RecursiveASTVisitor<Derived>::TraverseCXXRecordHelper(
     CXXRecordDecl *D) {
   if (!TraverseRecordHelper(D))
     return false;
-  if (D->hasDefinition()) {
+  if (D->isCompleteDefinition()) {
     for (CXXRecordDecl::base_class_iterator I = D->bases_begin(),
                                             E = D->bases_end();
          I != E; ++I) {

unittests/Tooling/RecursiveASTVisitorTest.cpp

@@ -106,6 +106,7 @@ protected:
         FullLocation.isValid() &&
         FullLocation.getSpellingLineNumber() == ExpectedLine &&
         FullLocation.getSpellingColumnNumber() == ExpectedColumn) {
+      EXPECT_TRUE(!Found);
       Found = true;
     } else if (Name == ExpectedMatch ||
                (FullLocation.isValid() &&
@@ -157,6 +158,31 @@ TEST(RecursiveASTVisitor, VisitsBaseClassDeclarations) {
   EXPECT_TRUE(Visitor.runOver("class X {}; class Y : public X {};"));
 }
 
+TEST(RecursiveASTVisitor, VisitsCXXBaseSpecifiersOfForwardDeclaredClass) {
+  TypeLocVisitor Visitor;
+  Visitor.ExpectMatch("class X", 3, 18);
+  EXPECT_TRUE(Visitor.runOver(
+    "class Y;\n"
+    "class X {};\n"
+    "class Y : public X {};"));
+}
+
+TEST(RecursiveASTVisitor, VisitsCXXBaseSpecifiersWithIncompleteInnerClass) {
+  TypeLocVisitor Visitor;
+  Visitor.ExpectMatch("class X", 2, 18);
+  EXPECT_TRUE(Visitor.runOver(
+    "class X {};\n"
+    "class Y : public X { class Z; };"));
+}
+
+TEST(RecursiveASTVisitor, VisitsCXXBaseSpecifiersOfSelfReferentialType) {
+  TypeLocVisitor Visitor;
+  Visitor.ExpectMatch("X<class Y>", 2, 18);
+  EXPECT_TRUE(Visitor.runOver(
+    "template<typename T> class X {};\n"
+    "class Y : public X<Y> {};"));
+}
+
 TEST(RecursiveASTVisitor, VisitsBaseClassTemplateArguments) {
   DeclRefExprVisitor Visitor;
   Visitor.ExpectMatch("x", 2, 3);