[Bug c++/54216] New: Missing diagnostic for ill-formed anonymous enum declarations

[Bug c++/54216] New: Missing diagnostic for ill-formed anonymous enum declarations

[frankhb1989 at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54216

             Bug #: 54216
           Summary: Missing diagnostic for ill-formed anonymous enum
                    declarations
    Classification: Unclassified
           Product: gcc
           Version: 4.7.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: frankhb1989@gmail.com


G++(-pedantic-errors) wrongly accepts following non-conforming enumeration
declarations(in namespace scope or block scope) and no diagnostic output at
all:

enum {}; //-std=c++98 or -std=c++11

enum class {}; //-std=c++11

enum class { x }; //-std=c++11

According the standard, all of them are ill-formed:

(for the first declaration)
ISO C++98/03/11
7/3 ...
[Example:
enum { }; // ill-formed
typedef class { }; // ill-formed
—end example]

(for others)
ISO C++11
7.2/2 ... The optional identifier shall not be omitted in the declaration of a
scoped enumeration. ...

While clang++(trunk, also using -pedantic-errors) rejects them correctly:

(for the first declaration, -std=c++98 or -std=c++11)
error: declaration does not declare anything
      [-Werror,-Wmissing-declarations]
enum {};
^~~~

(for others, -std=c++11)
error: scoped enumeration requires a name
enum class { };
           ^
error: declaration does not declare anything
      [-Werror,-Wmissing-declarations]
enum class { };
^~~~
error: scoped enumeration requires a name
enum class { x };
           ^

[Bug c++/54216] Missing diagnostic for ill-formed anonymous enum declarations

[frankhb1989 at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54216

frankhb1989 at gmail dot com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|normal                      |minor

[Bug c++/54216] Missing diagnostic for ill-formed anonymous enum declarations

[paolo.carlini at oracle dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54216

Paolo Carlini <paolo.carlini at oracle dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |amylaar at gcc dot gnu.org

--- Comment #1 from Paolo Carlini <paolo.carlini at oracle dot com> 2012-10-11 00:34:06 UTC ---
*** Bug 29018 has been marked as a duplicate of this bug. ***

[Bug c++/54216] Missing diagnostic for ill-formed anonymous enum declarations

[paolo.carlini at oracle dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54216

Paolo Carlini <paolo.carlini at oracle dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |ASSIGNED
   Last reconfirmed|                            |2013-04-10
         AssignedTo|unassigned at gcc dot       |paolo.carlini at oracle dot
                   |gnu.org                     |com
   Target Milestone|---                         |4.9.0
     Ever Confirmed|0                           |1

--- Comment #2 from Paolo Carlini <paolo.carlini at oracle dot com> 2013-04-10 00:36:11 UTC ---
Mine.

[Bug c++/54216] Missing diagnostic for ill-formed anonymous enum declarations

[paolo.carlini at oracle dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54216

Paolo Carlini <paolo.carlini at oracle dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jason at gcc dot gnu.org

--- Comment #3 from Paolo Carlini <paolo.carlini at oracle dot com> 2013-04-10 00:41:06 UTC ---
Hi Jason. I'm working on this and the patch is trivial but I suspect that quite
a few testcases (in the library too) need adjusting. Thus, before I start to do
that, wanted to ask: is it Ok a pedwarn for the first case:

enum {}; //-std=c++98 or -std=c++11

and an hard error for the other two:

enum class {}; //-std=c++11

enum class { x }; //-std=c++11

? Like:

54216.C:1:6: warning: anonymous enumeration may not be empty [-Wpedantic]
 enum {}; //-std=c++98 or -std=c++11
      ^
54216.C:3:12: error: scoped enumeration without a name
 enum class {}; //-std=c++11
            ^
54216.C:5:12: error: scoped enumeration without a name
 enum class { x }; //-std=c++11
            ^

[Bug c++/54216] Missing diagnostic for ill-formed anonymous enum declarations

[paolo.carlini at oracle dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54216

Paolo Carlini <paolo.carlini at oracle dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
                 CC|jason at gcc dot gnu.org    |
         Resolution|                            |FIXED

--- Comment #4 from Paolo Carlini <paolo.carlini at oracle dot com> 2013-04-11 09:04:55 UTC ---
Fixed in r197742.