[Bug c++/23689] New: Malformed typedef silently ignored

[Bug c++/23689] New: Malformed typedef silently ignored

[simon_baldwin at yahoo dot com]

Given the program

  typedef enum { ZERO };   // error, malformed typedef, missing identifier
  typedef struct dummy {}; // ditto

gcc will silently step over and apparently ignore the typedef, treating the
statement as a simple "enum { ZERO };" rather than a "typedef enum { ZERO }
type_name;" where type_name has been accidentally omitted.

Grammatically, perhaps correct.  However, a warning or error message here would
be handy.

-- 
           Summary: Malformed typedef silently ignored
           Product: gcc
           Version: 4.1.0
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: P2
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: simon_baldwin at yahoo dot com
                CC: gcc-bugs at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23689

[Bug c++/23689] Malformed typedef silently ignored

[falk at debian dot org]

------- Additional Comments From falk at debian dot org  2005-09-02 13:02 -------
Works for me with any gcc version:

falk@juist:/tmp% gcc-3.4 -c test.c 
test.c:1: warning: useless keyword or type name in empty declaration
test.c:2: warning: useless keyword or type name in empty declaration

What is the exact version you are using and the exact flags you are passing?


-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |WAITING


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23689

Re: [Bug c++/23689] Malformed typedef silently ignored

[Gabriel Dos Reis]

"falk at debian dot org" <gcc-bugzilla@gcc.gnu.org> writes:

| Works for me with any gcc version:
| 
| falk@juist:/tmp% gcc-3.4 -c test.c 
| test.c:1: warning: useless keyword or type name in empty declaration
| test.c:2: warning: useless keyword or type name in empty declaration
| 
| What is the exact version you are using and the exact flags you are passing?

The bug was reported against C++; I believe you're testing with a C
compiler, instead of C++.

-- Gaby

[Bug c++/23689] Malformed typedef silently ignored

[gdr at integrable-solutions dot net]

------- Additional Comments From gdr at integrable-solutions dot net  2005-09-02 13:25 -------
Subject: Re:  Malformed typedef silently ignored

"falk at debian dot org" <gcc-bugzilla@gcc.gnu.org> writes:

| Works for me with any gcc version:
| 
| falk@juist:/tmp% gcc-3.4 -c test.c 
| test.c:1: warning: useless keyword or type name in empty declaration
| test.c:2: warning: useless keyword or type name in empty declaration
| 
| What is the exact version you are using and the exact flags you are passing?

The bug was reported against C++; I believe you're testing with a C
compiler, instead of C++.

-- Gaby


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23689

[Bug c++/23689] Malformed typedef silently ignored

[simon_baldwin at yahoo dot com]

------- Additional Comments From simon_baldwin at yahoo dot com  2005-09-02 19:12 -------
The problem's restricted to the C++ front end only, and is common across
multiple releases and at the highest warning settings:

$ cat e.cc
typedef enum { ZERO };   // error, malformed typedef, missing identifier
typedef struct dummy {}; // ditto

$ g++-4.1 -Wall -W -pedantic -c e.cc
$ g++-4.0.1-k8 -Wall -W -pedantic -c e.cc
$ g++-3.4.1 -Wall -W -pedantic -c e.cc
$ g++-3.2.2 -Wall -W -pedantic -c e.cc
$ g++-2.95 -Wall -W -pedantic -c e.c


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23689

[Bug c++/23689] Malformed typedef silently ignored

[pinskia at gcc dot gnu dot org]

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|WAITING                     |NEW
     Ever Confirmed|                            |1
   Last reconfirmed|0000-00-00 00:00:00         |2005-09-02 19:19:17
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23689

[Bug c++/23689] Malformed typedef silently ignored

[pinskia at gcc dot gnu dot org]

------- Comment #4 from pinskia at gcc dot gnu dot org  2006-03-05 03:19 -------
I have also seen this while reducing sources using delta.


-- 

pinskia at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |pinskia at gcc dot gnu dot
                   |                            |org
           Severity|enhancement                 |minor
   Last reconfirmed|2005-09-02 19:19:17         |2006-03-05 03:19:00
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23689

[Bug c++/23689] Malformed typedef silently ignored

[manu at gcc dot gnu dot org]

------- Comment #5 from manu at gcc dot gnu dot org  2007-02-09 12:44 -------
Someone posted a patch. It is not in the patch queue, so I mention it here
before it gets lost:
http://gcc.gnu.org/ml/gcc-patches/2007-02/msg00114.html


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23689

[Bug c++/23689] Malformed typedef silently ignored

[patchapp at dberlin dot org]

------- Comment #6 from patchapp at dberlin dot org  2007-02-16 17:17 -------
Subject: Bug number PR c++/23689

A patch for this bug has been added to the patch tracker.
The mailing list url for the patch is
http://gcc.gnu.org/ml/gcc-patches/2007-02/msg00114.html


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23689

[Bug c++/23689] Malformed typedef silently ignored

[ian at gcc dot gnu dot org]

------- Comment #7 from ian at gcc dot gnu dot org  2007-03-01 19:13 -------
Subject: Bug 23689

Author: ian
Date: Thu Mar  1 19:13:02 2007
New Revision: 122434

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=122434
Log:
cp/:
        PR c++/23689
        * decl.c (check_tag_decl): Added new warning for typedef ignored
        when it precedes an otherwise valid non-typedef declaration.
testsuite/:
        PR c++/23689
        * warn/ignored_typedef.C: New.
        * init/ctor8.C: Added dg-warning to consume ignored typedef
        warning. 
        * template/typedef2.C: Ditto.  Moved dg-error onto its own line
        and added an explicit line number.

Added:
    trunk/gcc/testsuite/g++.dg/warn/ignored_typedef.C
Modified:
    trunk/gcc/cp/ChangeLog
    trunk/gcc/cp/decl.c
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/testsuite/g++.dg/init/ctor8.C
    trunk/gcc/testsuite/g++.dg/template/typedef2.C


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23689

[Bug c++/23689] Malformed typedef silently ignored

[simon_baldwin at yahoo dot com]

------- Comment #8 from simon_baldwin at yahoo dot com  2007-06-25 17:26 -------
Resolved by revision 122434.


-- 

simon_baldwin at yahoo dot com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |FIXED


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23689