[Bug libstdc++/60407] New: call of overloaded ‘isnan’ is ambiguous

[Bug libstdc++/60407] New: call of overloaded ‘isnan’ is ambiguous

[dilawar.s.rajput at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60407

            Bug ID: 60407
           Summary: call of overloaded ‘isnan’ is ambiguous
           Product: gcc
           Version: 4.8.0
            Status: UNCONFIRMED
          Severity: minor
          Priority: P3
         Component: libstdc++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: dilawar.s.rajput at gmail dot com

In a large project, I get the following trace. This, however, compiled with
g++4.7.x. Flag -std=c++11 is enabled in both cases.


ksolve/RateTerm.h:402:29: note: candidates are:
In file included from /usr/include/features.h:371:0,
                 from /usr/include/math.h:27,
<deleted lines>
/usr/include/i386-linux-gnu/bits/mathcalls.h:235:1: note: int isnan(double)
 __MATHDECL_1 (int,isnan,, (_Mdouble_ __value)) __attribute__ ((__const__));
 ^
In file included from /usr/include/c++/4.8/random:38:0,
                 from /usr/include/c++/4.8/bits/stl_algo.h:65,
                 from /usr/include/c++/4.8/algorithm:62,
<deleted lines>
/usr/include/c++/4.8/cmath:626:3: note: constexpr bool std::isnan(long double)
   isnan(long double __x)
>From gcc-bugs-return-445356-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Mar 04 09:32:57 2014
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Subject: [Bug lto/60405] ICE in lto1 on x86_64-linux-gnu
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id`405

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |ASSIGNED
   Last reconfirmed|                            |2014-03-04
           Assignee|unassigned at gcc dot gnu.org      |rguenth at gcc dot gnu.org
     Ever confirmed|0                           |1

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed.  We fail to do the version check.

[Bug libstdc++/60407] call of overloaded ‘isnan’ is ambiguous

[pinskia at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60407

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
This sounds like you are including math.h and then later on cmath.  I don't
know if this is a valid thing to do.

[Bug libstdc++/60407] call of overloaded ‘isnan’ is ambiguous

[pinskia at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60407

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
But I cannot reproduce it with what I thought it was, please provide the
preprocessed source.

[Bug libstdc++/60407] call of overloaded ‘isnan’ is ambiguous

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60407

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |WAITING
   Last reconfirmed|                            |2014-03-04
     Ever confirmed|0                           |1

--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
It's perfectly valid to do that.

Without a testcase we can't do anything, please read http://gcc.gnu.org/bugs/

[Bug libstdc++/60407] call of overloaded ‘isnan’ is ambiguous

[dilawar.s.rajput at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60407

Dilawar Singh <dilawar.s.rajput at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                URL|                            |https://gist.githubusercont
                   |                            |ent.com/dilawar/9343802/raw
                   |                            |/0eeac3f0d745af607cf1aab880
                   |                            |b315e255fa003e/gcc-bug-6040
                   |                            |7

--- Comment #4 from Dilawar Singh <dilawar.s.rajput at gmail dot com> ---
g++ info can be found here 

http://pastebin.com/raw.php?i=dA05h3ku

[Bug libstdc++/60407] call of overloaded ‘isnan’ is ambiguous

[dilawar.s.rajput at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60407

--- Comment #5 from Dilawar Singh <dilawar.s.rajput at gmail dot com> ---
Hi,

Added the *.ii file and g++ -v output. Since one file was large, links are
given.


(In reply to Dilawar Singh from comment #4)
> g++ info can be found here 
> 
> http://pastebin.com/raw.php?i=dA05h3ku

[Bug libstdc++/60407] call of overloaded ‘isnan’ is ambiguous

[burnus at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60407

Tobias Burnus <burnus at gcc dot gnu.org> changed:

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

--- Comment #6 from Tobias Burnus <burnus at gcc dot gnu.org> ---
(In reply to Dilawar Singh from comment #5)
> Added the *.ii file and g++ -v output. Since one file was large, links are
> given.
> > http://pastebin.com/raw.php?i=dA05h3ku


The g++ output I found at your pastebin link, however, I do not see the .ii
file.

[Bug libstdc++/60407] call of overloaded ‘isnan’ is ambiguous

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60407

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|WAITING                     |NEW

--- Comment #7 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(Tobias, see the URL field)

Reduced:

#include <math.h>
#include <cmath>

using namespace std;

int main()
{
  double d = 1.0;
  return isnan(d);
}


isnan.cc: In function ‘int main()’:
isnan.cc:9:17: error: call of overloaded ‘isnan(double&)’ is ambiguous
   return isnan(d);
                 ^
isnan.cc:9:17: note: candidates are:
In file included from /usr/include/features.h:364:0,
                 from /usr/include/math.h:26,
                 from isnan.cc:1:
/usr/include/bits/mathcalls.h:234:1: note: int isnan(double)
 __MATHDECL_1 (int,isnan,, (_Mdouble_ __value)) __attribute__ ((__const__));
 ^
In file included from isnan.cc:2:0:
/usr/include/c++/4.8.2/cmath:626:3: note: constexpr bool std::isnan(long
double)
   isnan(long double __x)
   ^
/usr/include/c++/4.8.2/cmath:622:3: note: constexpr bool std::isnan(double)
   isnan(double __x)
   ^
/usr/include/c++/4.8.2/cmath:618:3: note: constexpr bool std::isnan(float)
   isnan(float __x)
   ^
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Subject: [Bug libstdc++/60407] [=?UTF-8?Q?C++11call of overloaded ‘isnan’ is ambiguous?Date: Tue, 04 Mar 2014 11:14:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60407

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|call of overloaded ‘isnan’  |[C++11call of overloaded
                   |is ambiguous                |‘isnan’ is ambiguous

--- Comment #8 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Dilawar Singh from comment #0)
> In a large project, I get the following trace. This, however, compiled with
> g++4.7.x. Flag -std=c++11 is enabled in both cases.

Are you sure?

I get the same result with GCC 4.7.4, but only with -std=c++11
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Subject: [Bug c++/60409] [4.9 Regression] [c++1y] ICE on valid with template function
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id`409

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
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   Last reconfirmed|                            |2014-03-04
   Target Milestone|---                         |4.9.0
     Ever confirmed|0                           |1

[Bug libstdc++/60407] [C++11] call of overloaded ‘isnan’ is ambiguous

[dilawar.s.rajput at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60407

--- Comment #9 from Dilawar Singh <dilawar.s.rajput at gmail dot com> ---
The snippet I sent you (in url filed) is a part of large project which compiles
fine on Ubuntu-server (gcc4.7.x, I am not sure about x).

I will confirm it later once I login onto server again. Once I change `isnan`
to `std::isnan` in my project, it compiles fine with my g++-4.8.1.

[Bug libstdc++/60407] [C++11] call of overloaded ‘isnan’ is ambiguous

[glisse at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60407

--- Comment #10 from Marc Glisse <glisse at gcc dot gnu.org> ---
Looks like a dup of PR 48891.

[Bug libstdc++/60407] [C++11] call of overloaded ‘isnan’ is ambiguous

[glisse at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60407

--- Comment #11 from Marc Glisse <glisse at gcc dot gnu.org> ---
> Looks like a dup of PR 48891.

See also the comments for PR 54130.

[Bug libstdc++/60407] [C++11] call of overloaded ‘isnan’ is ambiguous

[dilawar.s.rajput at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60407

--- Comment #12 from Dilawar Singh <dilawar.s.rajput at gmail dot com> ---
(In reply to Marc Glisse from comment #10)
> Looks like a dup of PR 48891.

Yes. It is very similar to this. Fine with me if it is marked dup.

I was mistaken about gcc version on server. It is default gcc comes with
Ubuntu-Precice (gcc-4.6.3). Also -std=c++0x flag is not set with gcc-4.6.3. So
in nutshell, compiles with gcc4.6.3 without -std=c++0x, but fails with
gcc-4.8.0 with -std=c++0x. 

I mentioned -std=c++11 wrongly in first report.

[Bug libstdc++/60407] [C++11] call of overloaded ‘isnan’ is ambiguous

[eugene.zelenko at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=60407

Eugene Zelenko <eugene.zelenko at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |eugene.zelenko at gmail dot com

--- Comment #13 from Eugene Zelenko <eugene.zelenko at gmail dot com> ---
Same problem exists in 4.9.2.

In my code combining <cmath> with <vector> (later includes os_defines.h then
features.h and mathcalls.h) produce same effect.