[Bug c++/51242] [C++11] Unable to use strongly typed enums as bit fields

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51242

--- Comment #6 from Jonathan Wakely <redi at gcc dot gnu.org> 2012-11-19 11:52:38 UTC ---
The check is for an unscoped enumeration type which does seem intentional.

This change allows the example to compile:

--- cp/decl2.c.orig     2012-11-19 11:50:28.842443803 +0000
+++ cp/decl2.c  2012-11-19 11:46:08.445472115 +0000
@@ -1026,7 +1026,7 @@
   if (TREE_CODE (value) == VOID_TYPE)
     return void_type_node;

-  if (!INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (value))
+  if (!INTEGRAL_OR_ENUMERATION_TYPE_P (TREE_TYPE (value))
       && (POINTER_TYPE_P (value)
           || !dependent_type_p (TREE_TYPE (value))))
     {

It emits a warning though:

e.cc:5:19: warning: 'MyClass::Field1' is too small to hold all values of 'enum
class MyEnum' [enabled by default]