X-Recipient: archive-cygwin AT delorie DOT com
X-SWARE-Spam-Status: No, hits=-1.8 required=5.0	tests=AWL,BAYES_00,FREEMAIL_FROM,TW_BK,T_RP_MATCHES_RCVD
X-Spam-Check-By: sourceware.org
Message-ID: <4C738B50.1040702@alice.it>
Date: Tue, 24 Aug 2010 11:05:20 +0200
From: Angelo Graziosi <angelo DOT graziosi AT alice DOT it>
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; it; rv:1.9.2.8) Gecko/20100802 Thunderbird/3.1.2
MIME-Version: 1.0
To: Cygwin <cygwin AT cygwin DOT com>, Emacs <emacs-devel AT gnu DOT org>
Subject: Re: Building Emacs-trunk with gcc >= 4.5.1 and libelf installed
Content-Type: text/plain; charset=UTF-8; format=flowed
Content-Transfer-Encoding: 7bit
Mailing-List: contact cygwin-help AT cygwin DOT com; run by ezmlm
List-Id: <cygwin.cygwin.com>
List-Subscribe: <mailto:cygwin-subscribe AT cygwin DOT com>
List-Archive: <http://sourceware.org/ml/cygwin/>
List-Post: <mailto:cygwin AT cygwin DOT com>
List-Help: <mailto:cygwin-help AT cygwin DOT com>, <http://sourceware.org/ml/#faqs>
Sender: cygwin-owner AT cygwin DOT com
Mail-Followup-To: cygwin AT cygwin DOT com
Delivered-To: mailing list cygwin AT cygwin DOT com

Yaakov ,
thanks for clarifications and suggestions. I hope someone on the Emacs 
list can recipie and apply them appropriately.

Emacs guys,
the simplest workaround I found to fix the issue was to add

#undef SVR4

in src/s/cygwin.h

Thanks,
Angelo.


Yaakov (Cygwin/X) wrote:
> On Tue, 2010-08-24 at 01:31 +0200, Angelo Graziosi wrote:
>> Trying to build Emacs-trunk on Cygwin with GCC >= 4.5.1, I have found a
>> problem if also the package 'libelf0' is installed.
> [snip]
>> and the following test in 'configure' script is true:
> [snip]
>> i.e. SVR4 is _defined_. But... 'src/xfaces.c' includes indirectly via
>> '/usr/include/X11/Xos.h' the header '/usr/include/X11/Xarch.h', which has:
> [snip]
>> i.e. finding SVR4 defined, it searches for 'byteorder.h' in
>> '/usr/include/sys' and not in '/usr/include/asm', where it lives (*as on
>> GNU/Linux*[1]), and this leads to the above failure.
>
> This is coming from autoconf's AC_FUNC_GETLOADAVG, which tries to find
> several different getloadavg(3) implementations (which Cygwin doesn't
> provide), otherwise it points to an AC_LIBOBJ from gnulib.  On Solaris,
> the gnulib getloadavg uses kvm_open(3) and friends, and libkvm requires
> libelf, hence the check for the latter.
>
> AFAICS the proper solution is, in _AC_LIBOBJ_GETLOADAVG:
>
> if test $ac_have_func = no && test "$ac_cv_lib_elf_elf_begin" = yes;
> then
>   ac_have_func=yes
>   AC_DEFINE(SVR4, 1, [Define to 1 on System V Release 4.])
> fi
>
> to add << && test "$ac_cv_lib_kvm_kvm_open" = yes >> to the conditional.
>
> In the meantime, since libelf isn't needed elsewhere in emacs, an easy
> workaround is to add "ac_cv_lib_elf_elf_begin=no" to CYGCONF_ARGS.

--
Problem reports:       http://cygwin.com/problems.html
FAQ:                   http://cygwin.com/faq/
Documentation:         http://cygwin.com/docs.html
Unsubscribe info:      http://cygwin.com/ml/#unsubscribe-simple