add support for initializing static vars with a cast to union (gcc extension)
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@62261 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Sema/SemaDecl.cpp b/lib/Sema/SemaDecl.cpp
index 468e955..0796639 100644
--- a/lib/Sema/SemaDecl.cpp
+++ b/lib/Sema/SemaDecl.cpp
@@ -2228,7 +2228,14 @@
// Allow block exprs at top level.
if (Init->getType()->isBlockPointerType())
return false;
-
+
+ // GCC cast to union extension
+ // note: the validity of the cast expr is checked by CheckCastTypes()
+ if (CastExpr *C = dyn_cast<CastExpr>(Init)) {
+ QualType T = C->getType();
+ return T->isUnionType() && CheckForConstantInitializer(C->getSubExpr(), T);
+ }
+
InitializerElementNotConstant(Init);
return true;
}