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, 2 insertions, 1 deletions

diff --git a/lib/CodeGen/CGBlocks.cpp b/lib/CodeGen/CGBlocks.cpp
index 9fe31cb958..5e36d9e8fb 100644
--- a/lib/CodeGen/CGBlocks.cpp
+++ b/lib/CodeGen/CGBlocks.cpp
@@ -734,7 +734,8 @@ llvm::Value *CodeGenFunction::EmitBlockLiteral(const CGBlockInfo &blockInfo) {
             AggValueSlot::forAddr(blockField, Align, Qualifiers(),
                                   AggValueSlot::IsDestructed,
                                   AggValueSlot::DoesNotNeedGCBarriers,
-                                  AggValueSlot::IsNotAliased);
+                                  AggValueSlot::IsNotAliased,
+                                  AggValueSlot::IsCompleteObject);
         EmitAggExpr(copyExpr, Slot);
       } else {
         EmitSynthesizedCXXCopyCtor(blockField, src, copyExpr);