[Bug c++/49813] [C++0x] sinh vs asinh vs constexpr

["paolo.carlini at oracle dot com" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49813

--- Comment #41 from Paolo Carlini <paolo.carlini at oracle dot com> 2011-07-25 19:58:52 UTC ---
The testcase in Comment #30 has the types wrong, the below is a corrected
version (the substance of the issue doesn't change at all). I'm also thinking
of checking in the library bits with a temporary workaround of the form:

  inline constexpr bool
  isinf(long double __x)
  { return fpclassify(__x) == FP_INFINITE; }

which works.

/////////////

inline constexpr bool
isinf(long double __x)
{ return __builtin_isinf(__x); }

inline constexpr bool
isinf(double __x)
{ return __builtin_isinf(__x); }

inline constexpr bool
isnan(long double __x)
{ return __builtin_isnan(__x); }

int main()
{
  constexpr  int i1 = __builtin_isinf(1.l);  // Ok.
  constexpr bool b2 = isinf(1.l);            // Error.
  constexpr bool b3 = isinf(1.);             // Ok.
  constexpr bool b4 = isnan(1.l);            // Ok.
}