[Bug c++/39159] unhelpful attribute warning on matching declaration after definition

[Bug c++/39159] unhelpful attribute warning on matching declaration after definition

[jj at chaosbits dot net]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=39159

Jesper Juhl <jj at chaosbits dot net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jj at chaosbits dot net

--- Comment #2 from Jesper Juhl <jj at chaosbits dot net> ---
I've run into this as well with GCC 4.8.2 - it's rather annoying.

[Bug c++/39159] unhelpful attribute warning on matching declaration after definition

[manu at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=39159

Manuel López-Ibáñez <manu at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2014-08-16
                 CC|                            |manu at gcc dot gnu.org
     Ever confirmed|0                           |1

--- Comment #3 from Manuel López-Ibáñez <manu at gcc dot gnu.org> ---
Confirmed.

Perhaps it is not hard to fix. Just look how it is handled for functions.
Probably it is at the same place as this:

  void __attribute__ ((visibility ("default"))) foo () { }
  void __attribute__ ((visibility ("hidden"))) foo ();

pr39159.C:4:49: warning: ‘void foo()’: visibility attribute ignored because it
conflicts with previous declaration [-Wattributes]
   void __attribute__ ((visibility ("default"))) foo () { }
                                                 ^
pr39159.C:4:49: note: previous declaration of ‘void foo()’

and see if you can implement the same thing for types, probably at the point
where the " type attributes ignored" warning is given.
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From: "paolo.carlini at oracle dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/57466] [DR 1584] Argument deduction fails for 'const T*' when T is function type
Date: Sat, 16 Aug 2014 07:59:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idW466

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|REOPENED                    |ASSIGNED
           Assignee|unassigned at gcc dot gnu.org      |paolo.carlini at oracle dot com

--- Comment #8 from Paolo Carlini <paolo.carlini at oracle dot com> ---
Still working on this.

[Bug c++/39159] unhelpful attribute warning on matching declaration after definition

[sebor at roguewave dot com]

------- Comment #1 from sebor at roguewave dot com  2009-02-12 17:02 -------
In addition, as the test case below shows, the warning is issued inconsistently
between classes and functions, suggesting that the instance of the warning on
the class declaration on line 2 might be a bug rather than a feature:

$ cat -n t.C && g++ -dumpversion && g++ -c t.C
     1  struct __attribute__ ((visibility ("default"))) A { };
     2  struct __attribute__ ((visibility ("default"))) A;
     3
     4  void __attribute__ ((visibility ("default"))) foo () { }
     5  void __attribute__ ((visibility ("default"))) foo ();
4.3.1
t.C:2: warning: type attributes ignored after type is already defined


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39159