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Date: Thu, 6 Feb 2014 10:01:17 +0100
From: Corinna Vinschen <corinna-cygwin@cygwin.com>
To: cygwin@cygwin.com
Subject: Re: cygwin-1.7.28 getpwent header declaration changes ?
Message-ID: <20140206090117.GD2821@calimero.vinschen.de>
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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:
>=20
> ----------------------------------------------------------------
> /pub/devel/octave/octave-3.8.0-2/src/octave-3.8.0/liboctave/system/oct-pa=
sswd.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

The default settings per the sys/cdefs.h header are:

  #define __POSIX_VISIBLE         200809
  #define __XSI_VISIBLE           700
  #define __BSD_VISIBLE           1
  #define __ISO_C_VISIBLE         2011

unless your environment defines one of

  _XOPEN_SOURCE
  _POSIX_C_SOURCE
  _ANSI_SOURCE
  _C99_SOURCE
  _C11_SOURCE
  _GNU_SOURCE

Have a look at the end of /usr/include/sys/cdefs.h, it explains things.


Corinna

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

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