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Date: Wed, 12 Jun 2013 11:53:15 +0200
From: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: __cygwin_environ, __imp_environ, _cur_environ, where is 'environ' symbol?
Message-ID: <20130612095315.GB30377@calimero.vinschen.de>
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User-Agent: Mutt/1.5.21 (2010-09-15)

On Jun 11 23:55, Vasyl Khalak wrote:
> I have tried to compile 0.18.2 gettext on x64 Cygwin, and got
> "undefined reference to `environ'", where is the symbol?
> 
> user AT host /cygdrive/c/cygwin
> 
> 32 bit:
> $ nm lib/libcygwin.a
> 00000000 I __imp____cygwin_environ
> 00000000 I __nm____cygwin_environ
> ...
> 00000000 B _environ
> 
> $ nm bin/cygwin1.dll
> 61227a44 B ___cygwin_environ
> 6102db00 T _cur_environ AT 0
> 61184444 D _main_environ
> 
> 64 bit:
> $ nm /usr/lib/libcygwin.a
> 0000000000000000 I __imp_environ
> 0000000000000000 I __nm_environ
> 
> $ nm /usr/bin/cygwin1.dll
> 00000001802a4778 B __cygwin_environ

environ is the exported symbol referencing the internal __cygwin_environ
variable on x86_64.  Linking against and accessing it works for me:

  $ uname -a
  CYGWIN_NT-6.2 VMBERT864 1.7.21(0.266/5/3) 2013-06-11 21:43 x86_64 Cygwin
  $ cat > envtest.c <<EOF
  #include <stdio.h>

  int
  main ()
  {
    extern char **environ;

    printf ("environ: %p first entry: <%s>\n", &environ, environ[0]);
    return 0;
  }
  EOF
  $ gcc -o envtest envtest.c
  $ ./envtest
  environ: 0x1802a4778 first entry: <ALLUSERSPROFILE=C:\ProgramData>


Corinna

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

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