Add various tests for captures and the reaching scope of the lambda

expression. Implement C++11 [expr.prim.lambda]p12's requirement that
capturing a variable will odr-use it.

llvm-svn: 150237

1 files changed, 5 insertions, 1 deletions

diff --git a/clang/lib/Sema/SemaExpr.cpp b/clang/lib/Sema/SemaExpr.cpp
index ae5dc55825b..fc7f32ec6d0 100644
--- a/clang/lib/Sema/SemaExpr.cpp
+++ b/clang/lib/Sema/SemaExpr.cpp
@@ -9624,8 +9624,12 @@ static ExprResult captureInLambda(Sema &S, LambdaScopeInfo *LSI,
   // to be re-"exported" from the lambda expression itself.
   S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated);
 
+  // C++ [expr.prim.labda]p12:
+  //   An entity captured by a lambda-expression is odr-used (3.2) in
+  //   the scope containing the lambda-expression.
   Expr *Ref = new (S.Context) DeclRefExpr(Var, Type.getNonReferenceType(),
                                           VK_LValue, Loc);
+  Var->setUsed(true);
 
   // When the field has array type, create index variables for each
   // dimension of the array. We use these index variables to subscript
@@ -9999,7 +10003,7 @@ void Sema::MarkMemberReferenced(MemberExpr *E) {
   MarkExprReferenced(*this, E->getMemberLoc(), E->getMemberDecl(), E);
 }
 
-/// \brief Perform marking for a reference to an aribitrary declaration.  It
+/// \brief Perform marking for a reference to an arbitrary declaration.  It
 /// marks the declaration referenced, and performs odr-use checking for functions
 /// and variables. This method should not be used when building an normal
 /// expression which refers to a variable.