PR5520: Make sure to check whether the base type is complete before looking for

operator->.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@89180 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 9 insertions, 1 deletions

diff --git a/lib/Sema/SemaOverload.cpp b/lib/Sema/SemaOverload.cpp
index 938a5d769d..634c9ceefc 100644
--- a/lib/Sema/SemaOverload.cpp
+++ b/lib/Sema/SemaOverload.cpp
@@ -5503,6 +5503,11 @@ Sema::BuildOverloadedArrowExpr(Scope *S, ExprArg BaseIn, SourceLocation OpLoc) {
   OverloadCandidateSet CandidateSet;
   const RecordType *BaseRecord = Base->getType()->getAs<RecordType>();
 
+  if (RequireCompleteType(Base->getLocStart(), Base->getType(),
+                          PDiag(diag::err_typecheck_incomplete_tag)
+                            << Base->getSourceRange()))
+    return ExprError();
+
   LookupResult R(*this, OpName, OpLoc, LookupOrdinaryName);
   LookupQualifiedName(R, BaseRecord->getDecl());
   R.suppressDiagnostics();
diff --git a/test/SemaCXX/arrow-operator.cpp b/test/SemaCXX/arrow-operator.cpp
index a2264958bc..08b3cd4cc7 100644
--- a/test/SemaCXX/arrow-operator.cpp
+++ b/test/SemaCXX/arrow-operator.cpp
@@ -16,7 +16,10 @@ struct C : A, B {
 
 struct D : A { };
 
-void f(C &c, D& d) {
+struct E; // expected-note {{forward declaration of 'struct E'}}
+
+void f(C &c, D& d, E& e) {
   c->f(); // expected-error{{use of overloaded operator '->' is ambiguous}}
   d->f();
+  e->f(); // expected-error{{incomplete definition of type}}
 }