Loop in cmath

[Andrea Venturoli]

Hello.

This is on a 5.4p13 i386 box; from /usr/include/c++/3.4/cmath:

...
#if _GLIBCXX_USE_C99_MATH
#if !_GLIBCXX_USE_C99_FP_MACROS_DYNAMIC
namespace __gnu_cxx
{
...
   template<typename _Tp>
     int
     __capture_isnan(_Tp __f) { return isnan(__f); }
...
}
...
#undef isnan
...
#endif /* _GLIBCXX_USE_C99_FP_MACROS_DYNAMIC */
#endif

#if _GLIBCXX_USE_C99_MATH
#if !_GLIBCXX_USE_C99_FP_MACROS_DYNAMIC
namespace __gnu_cxx
{
...
   template<typename _Tp>
     int
     isnan(_Tp __f) { return __capture_isnan(__f); }
...
}

namespace std
{
...
   using __gnu_cxx::isnan;
}
#endif /* _GLIBCXX_USE_C99_FP_MACROS_DYNAMIC */
#endif





This results in any call to std::isnan looping thorugh the two above 
functions.

Is this a bug? Should any macro be defined to avoid this?

  bye & Thanks
	av.