GNU allows structs with flexible array members to be placed inside
arrays and other structs/unions as an extension. Downgrade our error
to a warning. Fixes PR3540.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@64239 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/Sema/array-constraint.c b/test/Sema/array-constraint.c
index d35b0ac..06b5d74 100644
--- a/test/Sema/array-constraint.c
+++ b/test/Sema/array-constraint.c
@@ -20,7 +20,7 @@
   int b[];
 };
 
-struct vari *func(struct vari a[]) { // expected-error {{'struct vari' may not be used as an array element due to flexible array member}}
+struct vari *func(struct vari a[]) { // expected-warning {{'struct vari' may not be used as an array element due to flexible array member}}
   return a;
 }