Re: long double (was "strtold?")

[Ralf Corsepius <ralf dot corsepius at rtems dot org>]

Schwarz, Konrad wrote:
> > -----Original Message-----
> > From: newlib-owner@sourceware.org 
> > [mailto:newlib-owner@sourceware.org] On Behalf Of Ken Werner
> > Sent: Wednesday, March 11, 2009 7:05 PM
> > To: newlib@sourceware.org; Howland Craig D (Craig)
> > Subject: Re: long double (was "strtold?")
> >
> > Hi,
> > What about mapping the long double functions to their 
> > counterparts on platforms where a double is as wide as a long 
> > double? The attached patch introduces a flag defined in 
> > sys/features.h. You mentioned HAVE_LONG_DOUBLE_WIDER but the 
> > user may not define this flag. Do you want to generate a 
> > header file that exposes this flag? Wouldn't that result in 
> > something like config.h to be shipped with newlib or am I 
> > missing something?
>
> Hi,
>
> may I suggest deriving the flag (_DOUBLE_EQUALS_LONG_DOUBLE) from macros
> defined by <float.h>?

It likely can be done even simpler:

Modern GCC's have internal defines
__SIZEOF_LONG_DOUBLE__
and
__SIZEOF_DOUBLE__


I.e. it's likely possible to apply similar tricks as in newlib's stdint.h.

Ralf