[PATCH 1/2] math.h: declare isinfl, isnanl for Cygwin

[Gregory Pietsch]

isnan and isinf are macros, not functions, so they should work on long 
doubles.

Something like:
#define isnan(_X) (fpclassify(_X)==FP_NAN)
#define isinf(_X) (fpclassify(_X)==FP_INFINITE)

I know Stroustrup hates macros, but we have not expanded into C99 
territory, right?

Anyway, given the macros, implementations for these two functions are 
trivial:

#include <math.h>

int (isnanl)(long double x)
{
   return isnan(x);
}

#include <math.h>

int (isinfl)(long double x)
{
   return isinf(x);
}

While we're at it, could we add isfinitel and isnormall too?

Gregory

On 4/1/2016 6:49 PM, Yaakov Selkowitz wrote:
> libstdc++ requires these to be declared in order to be enabled.
>
> Signed-off-by: Yaakov Selkowitz <yselkowi@redhat.com>
> ---
>   newlib/libc/include/math.h | 2 ++
>   1 file changed, 2 insertions(+)
>
> diff --git a/newlib/libc/include/math.h b/newlib/libc/include/math.h
> index e5d6123..a69abe9 100644
> --- a/newlib/libc/include/math.h
> +++ b/newlib/libc/include/math.h
> @@ -460,6 +460,8 @@ extern long double fmodl _PARAMS((long double, long double));
>   extern long double hypotl _PARAMS((long double, long double));
>   #endif /* ! defined (__math_68881) */
>   #endif /* ! defined (_REENT_ONLY) */
> +extern int isnanl _PARAMS((long double));
> +extern int isinfl _PARAMS((long double));
>   extern long double copysignl _PARAMS((long double, long double));
>   extern long double nanl _PARAMS((const char *));
>   extern int ilogbl _PARAMS((long double));