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Date: Thu, 6 Feb 2014 15:13:21 +0100
From: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: cygwin-1.7.28 getpwent header declaration changes ?
Message-ID: <20140206141321.GI2821@calimero.vinschen.de>
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On Feb  6 11:19, Marco Atzeri wrote:
>=20
>=20
> On 06/02/2014 10:01, Corinna Vinschen wrote:
> >On Feb  6 08:29, Marco Atzeri wrote:
> >>on cygwin-1.7.28 64 bit but not on cygwin-1.7.27,
> >>(only system difference) compiling octave I see:
> >>
> >>----------------------------------------------------------------
> >>/pub/devel/octave/octave-3.8.0-2/src/octave-3.8.0/liboctave/system/oct-=
passwd.cc
> >>:114:25: error: '::getpwent' has not been declared
> >>    return octave_passwd (::getpwent (), msg);
> >>                          ^
> >>[...]
> >>Is something slightly changed in the  relative system headers ?
> >
> >I don't know anything about octave, but what has changed is that newlib
> >is finally introducing BSD-like visibility macros.  The pwd.h header now
> >contains this:
> >
> >   #if __XSI_VISIBLE >=3D 500
> >   struct passwd   *getpwent (void);
> >   void             setpwent (void);
> >   void             endpwent (void);
> >   #endif
> > [...]
>=20
> thanks for the hints
>=20
> for what I can see  "_GNU_SOURCE" is defined in both cases at
> configure stage and reported in config.status and config.h
>=20
> I will look to compare the preprocessor output to see why building
> on  1.7.28 the "/* Everything and the kitchen sink. */" is not pulled in

Btw., it would be a good idea to get rid of calls to getpwent/getgrent
in future.  They *probably* won't do anymore what they were supposed to
do if you don't have passwd/group files.  A full implementation would
require to enumerate the local SAM and, at least, the primary domain
accounts at runtime.  That would be possible, but it comes at a hefty
price in terms of performance.


Corinna

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

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