Add missing check for creating an instance of an abstract class through an

implicit conversion sequence.

llvm-svn: 186769

clang/lib/Sema/SemaExprCXX.cpp

@@ -2415,6 +2415,10 @@ static ExprResult BuildCXXCastArgument(Sema &S,
     CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(Method);
     SmallVector<Expr*, 8> ConstructorArgs;
 
+    if (S.RequireNonAbstractType(CastLoc, Ty,
+                                 diag::err_allocation_of_abstract_type))
+      return ExprError();
+
     if (S.CompleteConstructorCall(Constructor, From, CastLoc, ConstructorArgs))
       return ExprError();
 
@@ -2500,7 +2504,7 @@ Sema::PerformImplicitConversion(Expr *From, QualType ToType,
           BeforeToType = Ctor->getParamDecl(0)->getType().getNonReferenceType();
         }
       }
-      // Watch out for elipsis conversion.
+      // Watch out for ellipsis conversion.
       if (!ICS.UserDefined.EllipsisConversion) {
         ExprResult Res =
           PerformImplicitConversion(From, BeforeToType,

clang/test/SemaCXX/abstract.cpp

@@ -250,6 +250,13 @@ namespace test4 {
   };
 }
 
+namespace test5 {
+  struct A { A(int); virtual ~A() = 0; }; // expected-note {{pure virtual method}}
+  const A &a = 0; // expected-error {{abstract class}}
+  void f(const A &a = 0); // expected-error {{abstract class}}
+  void g() { f(0); } // expected-error {{abstract class}}
+}
+
 // PR9247: Crash on invalid in clang::Sema::ActOnFinishCXXMemberSpecification
 namespace pr9247 {
   struct A {