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X-HELO: calimero.vinschen.de
Date: Mon, 10 Mar 2014 16:40:04 +0100
From: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: strtold() availability
Message-ID: <20140310154004.GD28681@calimero.vinschen.de>
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On Mar 10 16:34, V=C3=A1clav Zeman wrote:
> On 10 March 2014 11:39, Corinna Vinschen wrote:
> > On Mar 10 10:11, V=C3=A1clav Zeman wrote:
> >> On 7 March 2014 21:08, Corinna Vinschen wrote:
> >> > On Mar  7 17:04, V=C3=A1clav Zeman wrote:
> >> >> Hi.
> >> >>
> >> >> This bit from /usr/include/stdlib.h hides the `strtold()` function
> >> >> even though the `strtold` symbol appears to be exported from
> >> >> `cygwin1.dll`:
> >> >>
> >> >> ~~~~{.c}
> >> >> /* On platforms where long double equals double.  */
> >> >> #ifdef _LDBL_EQ_DBL
> >> >> #if !defined(__STRICT_ANSI__) || (__STDC_VERSION__ >=3D 199901L) ||
> >> >> (__cplusplus >=3D 201103L)
> >> >> extern long double strtold (const char *__restrict, char **__restri=
ct);
> >> >> #endif
> >> >> #endif /* _LDBL_EQ_DBL */
> >> >> ~~~~
> >> >>
> >> >> This in turn breaks my source because I cannot use `_GLIBCXX_USE_C9=
9`
> >> >> to expose some C++11 features like `std::vsnprintf()`.
> >> >>
> >> >> Shouldn't the `_LDBL_EQ_DBL` guard be removed and the function expo=
sed
> >> >> regardless of `double` and `long double` sizes?
> >> >
> >> > I fixed that in newlib after a discussion with my co-maintainer.
> >> > strtold now gets defined if _HAVE_LONG_DOUBLE is defined.  This is
> >> > the case for Cygwin, for instance.
> >>
> >> I think that similar fix needs to be applied to `wchar.h` and `wcstold=
()`.
> >
> > Not yet.  Newlib doesn't provide wcstold, only wcstod.
>=20
> I see this in `/usr/include/wchar.h`:
>=20
> ~~~~{.c}
> /* On platforms where long double equals double.  */
> #ifdef _LDBL_EQ_DBL
> long double _EXFUN(wcstold, (const wchar_t *, wchar_t **));
> #endif /* _LDBL_EQ_DBL */
> ~~~~

Yes.  And looking into the wcstold source you'd have seen this:

  /* On platforms where long double is as wide as double.  */
  #ifdef _LDBL_EQ_DBL
  long double
  wcstold (const wchar_t *__restrict nptr, wchar_t **__restrict endptr)
  {
    return wcstod(nptr, endptr);
  }
  #endif /* _LDBL_EQ_DBL */


Corinna

--=20
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

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