From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Angelo Graziosi Newsgroups: gmane.os.cygwin,gmane.emacs.devel Subject: Re: Building Emacs-trunk with gcc >= 4.5.1 and libelf installed Date: Tue, 24 Aug 2010 11:05:20 +0200 Message-ID: <4C738B50.1040702@alice.it> NNTP-Posting-Host: lo.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Trace: dough.gmane.org 1282640772 8021 80.91.229.12 (24 Aug 2010 09:06:12 GMT) X-Complaints-To: usenet@dough.gmane.org NNTP-Posting-Date: Tue, 24 Aug 2010 09:06:12 +0000 (UTC) To: Cygwin , Emacs Original-X-From: cygwin-return-165319-goc-cygwin=m.gmane.org@cygwin.com Tue Aug 24 11:06:11 2010 Return-path: Envelope-to: goc-cygwin@lo.gmane.org Original-Received: from server1.sourceware.org ([209.132.180.131] helo=sourceware.org) by lo.gmane.org with smtp (Exim 4.69) (envelope-from ) id 1OnpSM-0005XB-Pd for goc-cygwin@lo.gmane.org; Tue, 24 Aug 2010 11:06:11 +0200 Original-Received: (qmail 11042 invoked by alias); 24 Aug 2010 09:06:04 -0000 Original-Received: (qmail 11032 invoked by uid 22791); 24 Aug 2010 09:06:03 -0000 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 Original-Received: from smtp209.alice.it (HELO smtp209.alice.it) (82.57.200.105) by sourceware.org (qpsmtpd/0.43rc1) with ESMTP; Tue, 24 Aug 2010 09:05:29 +0000 Original-Received: from [82.57.167.160] (82.57.167.160) by smtp209.alice.it (8.5.124.08) id 4C1A275903E5C0CC; Tue, 24 Aug 2010 11:05:25 +0200 User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; it; rv:1.9.2.8) Gecko/20100802 Thunderbird/3.1.2 Mailing-List: contact cygwin-help@cygwin.com; run by ezmlm Precedence: bulk List-Id: List-Unsubscribe: List-Subscribe: List-Archive: List-Post: List-Help: , Original-Sender: cygwin-owner@cygwin.com Mail-Followup-To: cygwin@cygwin.com Xref: news.gmane.org gmane.os.cygwin:121383 gmane.emacs.devel:129120 Archived-At: 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.