We can't emit an aggregate cast as its sub-expression in general just
because the result is ignored.  The particular example here is with
property l-values, but there could be all sorts of lovely casts that this
isn't safe for.  Sink the check into the one case that seems to actually
be capable of honoring this.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@129397 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/CGExprAgg.cpp b/lib/CodeGen/CGExprAgg.cpp
index 177d0a4..4315915 100644
--- a/lib/CodeGen/CGExprAgg.cpp
+++ b/lib/CodeGen/CGExprAgg.cpp
@@ -249,11 +249,6 @@
 }
 
 void AggExprEmitter::VisitCastExpr(CastExpr *E) {
-  if (Dest.isIgnored() && E->getCastKind() != CK_Dynamic) {
-    Visit(E->getSubExpr());
-    return;
-  }
-
   switch (E->getCastKind()) {
   case CK_Dynamic: {
     assert(isa<CXXDynamicCastExpr>(E) && "CK_Dynamic without a dynamic_cast?");
@@ -270,6 +265,8 @@
   }
       
   case CK_ToUnion: {
+    if (Dest.isIgnored()) break;
+
     // GCC union extension
     QualType Ty = E->getSubExpr()->getType();
     QualType PtrTy = CGF.getContext().getPointerType(Ty);
diff --git a/test/CodeGenObjC/property-agrr-getter.m b/test/CodeGenObjC/property-agrr-getter.m
index 2dd32bb..6d8f1d6 100644
--- a/test/CodeGenObjC/property-agrr-getter.m
+++ b/test/CodeGenObjC/property-agrr-getter.m
@@ -1,4 +1,4 @@
-// RUN: %clang_cc1 -emit-llvm -o %t %s
+// RUN: %clang_cc1 -emit-llvm-only %s
 
 typedef struct {
   unsigned f0;
@@ -36,3 +36,9 @@
   AnObject* obj;
   return (obj.size).width;
 }
+
+// rdar://problem/9272392
+void test3(AnObject *obj) {
+  obj.size;
+  (void) obj.size;
+}