[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)
   ^