Allow the target field of a CK_ToUnion to be more easily recovered.

llvm-svn: 310963

1 files changed, 6 insertions, 13 deletions

diff --git a/clang/lib/Sema/SemaCast.cpp b/clang/lib/Sema/SemaCast.cpp
index d603101c3fd..ad6348685b6 100644
--- a/clang/lib/Sema/SemaCast.cpp
+++ b/clang/lib/Sema/SemaCast.cpp
@@ -2458,24 +2458,17 @@ void CastOperation::CheckCStyleCast() {
     // GCC's cast to union extension.
     if (DestRecordTy && DestRecordTy->getDecl()->isUnion()) {
       RecordDecl *RD = DestRecordTy->getDecl();
-      RecordDecl::field_iterator Field, FieldEnd;
-      for (Field = RD->field_begin(), FieldEnd = RD->field_end();
-           Field != FieldEnd; ++Field) {
-        if (Self.Context.hasSameUnqualifiedType(Field->getType(), SrcType) &&
-            !Field->isUnnamedBitfield()) {
-          Self.Diag(OpRange.getBegin(), diag::ext_typecheck_cast_to_union)
-            << SrcExpr.get()->getSourceRange();
-          break;
-        }
-      }
-      if (Field == FieldEnd) {
+      if (CastExpr::getTargetFieldForToUnionCast(RD, SrcType)) {
+        Self.Diag(OpRange.getBegin(), diag::ext_typecheck_cast_to_union)
+          << SrcExpr.get()->getSourceRange();
+        Kind = CK_ToUnion;
+        return;
+      } else {
         Self.Diag(OpRange.getBegin(), diag::err_typecheck_cast_to_union_no_type)
           << SrcType << SrcExpr.get()->getSourceRange();
         SrcExpr = ExprError();
         return;
       }
-      Kind = CK_ToUnion;
-      return;
     }
 
     // OpenCL v2.0 s6.13.10 - Allow casts from '0' to event_t type.