When we can't prove that the target of an aggregate copy is

a complete object, the memcpy needs to use the data size of
the structure instead of its sizeof() value.  Fixes PR12204.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@153613 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 3 insertions, 2 deletions

diff --git a/lib/CodeGen/CGDecl.cpp b/lib/CodeGen/CGDecl.cpp
index 970f0b2389..fa95377ff6 100644
--- a/lib/CodeGen/CGDecl.cpp
+++ b/lib/CodeGen/CGDecl.cpp
@@ -1092,9 +1092,10 @@ void CodeGenFunction::EmitExprAsInit(const Expr *init,
   } else {
     // TODO: how can we delay here if D is captured by its initializer?
     EmitAggExpr(init, AggValueSlot::forLValue(lvalue,
-                                              AggValueSlot::IsDestructed,
+                                         AggValueSlot::IsDestructed,
                                          AggValueSlot::DoesNotNeedGCBarriers,
-                                              AggValueSlot::IsNotAliased));
+                                         AggValueSlot::IsNotAliased,
+                                         AggValueSlot::IsCompleteObject));
     MaybeEmitStdInitializerListCleanup(lvalue.getAddress(), init);
   }
 }