From mboxrd@z Thu Jan 1 00:00:00 1970 X-Msuck: nntp://news.gmane.org/gmane.linux.lib.musl.general/8712 Path: news.gmane.org!not-for-mail From: Szabolcs Nagy Newsgroups: gmane.linux.lib.musl.general Subject: Re: __write alias missing on arm platforms Date: Thu, 22 Oct 2015 23:26:51 +0200 Message-ID: <20151022212650.GF10551@port70.net> References: <20151020031318.GA19600@brightrain.aerifal.cx> <56294562.4070303@dd-wrt.com> <20151022205525.GZ8645@brightrain.aerifal.cx> <562952BE.7030501@dd-wrt.com> Reply-To: musl@lists.openwall.com NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Trace: ger.gmane.org 1445549227 5455 80.91.229.3 (22 Oct 2015 21:27:07 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Thu, 22 Oct 2015 21:27:07 +0000 (UTC) Cc: Rich Felker To: musl@lists.openwall.com Original-X-From: musl-return-8725-gllmg-musl=m.gmane.org@lists.openwall.com Thu Oct 22 23:27:07 2015 Return-path: Envelope-to: gllmg-musl@m.gmane.org Original-Received: from mother.openwall.net ([195.42.179.200]) by plane.gmane.org with smtp (Exim 4.69) (envelope-from ) id 1ZpNO5-0005bI-Lj for gllmg-musl@m.gmane.org; Thu, 22 Oct 2015 23:27:05 +0200 Original-Received: (qmail 3308 invoked by uid 550); 22 Oct 2015 21:27:04 -0000 Mailing-List: contact musl-help@lists.openwall.com; run by ezmlm Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: Original-Received: (qmail 3290 invoked from network); 22 Oct 2015 21:27:03 -0000 Mail-Followup-To: musl@lists.openwall.com, Rich Felker Content-Disposition: inline In-Reply-To: <562952BE.7030501@dd-wrt.com> User-Agent: Mutt/1.5.23 (2014-03-12) Xref: news.gmane.org gmane.linux.lib.musl.general:8712 Archived-At: * Sebastian Gottschall [2015-10-22 23:18:54 +0200]: > Am 22.10.2015 um 22:55 schrieb Rich Felker: > >On Thu, Oct 22, 2015 at 10:21:54PM +0200, Sebastian Gottschall wrote: > >>musl is missing the __write function which seem to be a alias to "write". > >>this is required by libgcc on arm platforms. under some conditions > >>the compiler will generate code which does reference > >>this function then which leads to unresolved symbols > >>(seen on squid 4.0.1 on xscale) > >> > >>/home/xfs/toolchains/toolchain-armeb_xscale_gcc-5.2.0_musl-1.1.11/bin/../lib64/gcc/armeb-openwrt-linux-muslgnueabi/5.2.0/libgcc.a(linux-atomic-64bit.o): > >>In function `__check_for_sync8_kernelhelper': > >>/home/xfs/openwrt/trunk2/trunk/build_dir/toolchain-armeb_xscale_gcc-5.2.0_musl-1.1.11/gcc-5.2.0/libgcc/config/arm/linux-atomic-64bit.c:59: > >>undefined reference to `__write' > >>collect2: error: ld returned 1 exit status > >>l > >__write is not a public API even in glibc as far as I can tell. This > >looks like an abuse of an accidentally-public symbol by libgcc. For > >musl target anyway it should just be patched out of libgcc, e.g. with > >#ifdef. > you mean i have to send a bug report to GCC maintainers? i its part if the > libgcc sourcecode and is not provided by libgcc, but just referenced > i checked uclibc and glibc. both define __write as alias for write just > because of libgcc > > so lets declare musl as broken on arm if gcc is used, if this is a solution > for you :-) > i will submit a bug report about this. it should be fixed in gcc, __write is not part of any official abi (not even lsb!), there is no reason to use that here, it is broken on many platforms not just musl (bionic does not have it either). meanwhile we can think about some workaround (the most obvious is to patch libgcc since you are rebuilding gcc anyway, just remove the __write call and leave abort there) > > > >Rich > >