[Bug c/67432] New: Improve error message on empty enum

[chengniansun at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67432

            Bug ID: 67432
           Summary: Improve error message on empty enum
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: chengniansun at gmail dot com
  Target Milestone: ---

IMHO, it would be better to improve the error message on empty enumeration.  

$: cat t.c
enum E {};
$: gcc-trunk -c t.c
t.c:1:9: error: expected identifier before ‘}’ token
 enum E {};
         ^
$: clang-trunk -c t.c
t.c:1:9: error: use of empty enum
enum E {};
        ^
1 error generated.
$