Re: new module 'isnan-nolibm'

[Bruno Haible]

Eric Blake asked:
> For that matter, isnan() is specified to be a macro, not a function.  On
> what platforms does the macro in the system <math.h> truly rely on a libm
> function?

On AIX, OSF/1, HP-UX:

AIX 4.3.2:   isnan() is a function, defined in libm
OSF/1 4.0d:  isnan() is a function, defined in libm
HP-UX 11.00: isnan() is a macro, dispatching to _Isnanf, isnan, _Isnanf80,
             the first two being defined in libm.

Solaris 10:  isnan() is a function, defined in libc
Cygwin:      isnan() is a function, defined in cygwin.dll

Bruno