[Bug middle-end/48914] New: #pragma GCC diagnostic ignored "-Wc++0x-compat" doesn't work

[Bug middle-end/48914] New: #pragma GCC diagnostic ignored "-Wc++0x-compat" doesn't work

[bero at arklinux dot org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48914

           Summary: #pragma GCC diagnostic ignored "-Wc++0x-compat"
                    doesn't work
           Product: gcc
           Version: 4.6.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: bero@arklinux.org


$ cat test.cpp
#pragma GCC diagnostic ignored "-Wc++0x-compat"
namespace std {
        class nullptr_t { };
}
extern std::nullptr_t nullptr;

$ g++ -Wc++0x-compat -c test.cpp
test.cpp:5:1: warning: identifier ‘nullptr’ will become a keyword in C++0x
[-Wc++0x-compat]

$ g++ -Wc++0x-compat -Werror -c test.cpp
test.cpp:5:1: error: identifier ‘nullptr’ will become a keyword in C++0x
[-Werror=c++0x-compat]
cc1plus: all warnings being treated as errors

[Bug c++/48914] #pragma GCC diagnostic ignored "-Wc++0x-compat" doesn't work

[pinskia at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48914

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |diagnostic
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2011.07.24 20:12:48
          Component|middle-end                  |c++
     Ever Confirmed|0                           |1

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> 2011-07-24 20:12:48 UTC ---
Confirmed.

[Bug c++/48914] #pragma GCC diagnostic ignored "-Wc++0x-compat" doesn't work

[paolo.carlini at oracle dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48914

--- Comment #2 from Paolo Carlini <paolo.carlini at oracle dot com> 2011-09-28 17:34:44 UTC ---
So far have been able to figure out that diagnostic_classify_diagnostic
apparently sets correctly context->n_classification_history to 1 when the
pragma is parsed, but then is found == 0 in diagnostic_report_diagnostic.

[Bug c++/48914] #pragma GCC diagnostic ignored "-Wc++0x-compat" doesn't work

[paolo.carlini at oracle dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48914

--- Comment #3 from Paolo Carlini <paolo.carlini at oracle dot com> 2011-09-29 15:31:03 UTC ---
It seems, the warning is emitted *before* the pragma is actually processed in
diagnostic_classify_diagnostic...

[Bug c++/48914] #pragma GCC diagnostic ignored "-Wc++0x-compat" doesn't work

[asmwarrior at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48914

--- Comment #4 from asmwarrior <asmwarrior at gmail dot com> 2012-08-02 06:41:33 UTC ---
We are Code::Blocks' developers, we see the same annoying warnings, hope it
will be fixed. Thanks.
See:
http://forums.codeblocks.org/index.php/topic,16670.msg113169.html#msg113169

[Bug c++/48914] #pragma GCC diagnostic ignored "-Wc++0x-compat" doesn't work

[asmwarrior at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48914

--- Comment #5 from asmwarrior <asmwarrior at gmail dot com> 2012-08-02 08:28:10 UTC ---
(In reply to comment #4)
> We are Code::Blocks' developers, we see the same annoying warnings, hope it
> will be fixed. Thanks.
> See:
> http://forums.codeblocks.org/index.php/topic,16670.msg113169.html#msg113169

Sorry, I post a wrong link, the link is only accessed by C::B developers, so it
is a private link. But we just discuss the same issue.

[Bug c++/48914] #pragma GCC diagnostic ignored "-Wc++0x-compat" doesn't work

[rjarrett at mathworks dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48914

Roger Jarrett <rjarrett at mathworks dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |rjarrett at mathworks dot
                   |                            |com

--- Comment #6 from Roger Jarrett <rjarrett at mathworks dot com> 2013-01-01 18:04:49 UTC ---
Confirmed present in GCC 4.7.1 
g++ foo.cpp -Wall -std=c++98

 our use case is that we have a code base in transition to C++0x and have
created our own nullptr_t for the platform that have not yet transitioned to
C++0x we would like to acknowledge/suppress this warning in the file that
implements the nullptr_t without resorting to -Wno-c++0x-compat on the commmand
line.

--Roger

[Bug c++/48914] #pragma GCC diagnostic ignored "-Wc++0x-compat" doesn't work

[rjarrett at mathworks dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48914

--- Comment #7 from Roger Jarrett <rjarrett at mathworks dot com> 2013-01-02 18:51:12 UTC ---
Additional workaround (big hammer) 
#pragma GCC system_header

Best used when the code generating the warning is in an isolated header file
--Roger

[Bug c++/48914] #pragma GCC diagnostic ignored "-Wc++0x-compat" doesn't work

[manu at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48914

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

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

--- Comment #8 from Manuel López-Ibáñez <manu at gcc dot gnu.org> 2013-01-04 10:51:22 UTC ---
Indeed, handle_pragma_diagnostic is called too late after lexing because
pragmas are only parsed during the parsing phase but warnings can be emitted
way earlier (and even earlier than lexing, during command-line setup).

Bah, this doesn't look easy to fix at all.

[Bug c++/48914] #pragma GCC diagnostic ignored "-Wc++0x-compat" doesn't work

[manu at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=48914

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

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

--- Comment #10 from Manuel López-Ibáñez <manu at gcc dot gnu.org> ---
(In reply to Manuel López-Ibáñez from comment #9)
> If this warning is given by the preprocessor during lexing, then this is a
> dup of bug 53431.

It is.

*** This bug has been marked as a duplicate of bug 53431 ***
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53431

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |bero at arklinux dot org

--- Comment #8 from Manuel López-Ibáñez <manu at gcc dot gnu.org> ---
*** Bug 48914 has been marked as a duplicate of this bug. ***
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id 567

Mike Stump <mikestump at comcast dot net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |mikestump at comcast dot net

--- Comment #7 from Mike Stump <mikestump at comcast dot net> ---
gcc.c-torture/execute ignores dg-options settings has been fixed to honor it.

They now use the dg framework driver.

All the .x files are now gone.

The annotations have been updated.

No testcase specifies -O2 anymore.  One does -O, but that I think is for
correctness.

As for compile/981006-1.c, run was never needed to show the bug, so, assemble
alone is sufficient.  I don't know what might pop up from not using -w, I
suspect that was just inherited by default.  If you want to remove it (and
manage any fall out, I'd be fine with that.  I don't think it matters much.
The testcase isn't testing other warnings, just the one.