From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757101Ab3HQANI (ORCPT ); Fri, 16 Aug 2013 20:13:08 -0400 Received: from smtp.snhosting.dk ([87.238.248.203]:65263 "EHLO smtp.domainteam.dk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756574Ab3HQANG (ORCPT ); Fri, 16 Aug 2013 20:13:06 -0400 Date: Fri, 16 Aug 2013 21:26:51 +0200 From: Sam Ravnborg To: Guenter Roeck Cc: Max Filippov , "linux-kernel@vger.kernel.org" Subject: Re: Linux kernel cross-compilers Message-ID: <20130816192651.GA13953@merkur.ravnborg.org> References: <520C9A39.3030808@roeck-us.net> <20130816054823.GB28445@thor.bakeyournoodle.com> <520DD9CA.90305@roeck-us.net> <520DEF05.9030803@roeck-us.net> <520E48A7.3050401@roeck-us.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <520E48A7.3050401@roeck-us.net> User-Agent: Mutt/1.5.18 (2008-05-17) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Aug 16, 2013 at 08:43:35AM -0700, Guenter Roeck wrote: > On 08/16/2013 02:45 AM, Max Filippov wrote: >>>> Guenter, >>>> can you share a complete build log with V=1? >>>> >>> >>> http://roeck-us.net/linux/logs/make.xtensa.log.bad >>> http://roeck-us.net/linux/logs/make.xtensa.log.ok >>> >>> Key difference: the failing command in the bad case is >>> xtensa-linux-objcopy -O elf32-xtensa-le >>> and in the good case >>> xtensa-linux-objcopy -O elf32-xtensa-be >>> >>> Same compiler (4.6.3 from kernel.org), same configuration file, same command >>> line. >>> Configuration file is generated from defconfig, and the resulting .config >>> file >>> is the same in both cases. >>> >>> If I execute make and expicitly set BIG_ENDIAN=1 on the failing system as >>> parameter to it, >>> it works fine. If I set BIG_ENDIAN=0 on the passing system, it fails. >>> >>> I am puzzled. Guess there must be something different, but I have no idea >>> what it might be. >> >> What is the output of >> >> echo -e __XTENSA_EB__ | xtensa-linux-gcc -E - >> >> on the failing system? >> > It is "1", but that let me pinpoint the problem. > > On the failing system, the version of echo executed by make does > not understand the "-e" option. Thus, when running arch/xtensa/boot/Makefile, > "echo -e __XTENSA_EB__" returns "-e __XTENSA_EB__", which doesn't compile, > and BIG_ENDIAN ends up being 0. So the compiler is completely innocent. > > I found out the root source: SHELL is set the /bin/sh, which on the failing > system points to /bin/dash (default in Ubuntu, or at least it used to be). > dash apparently has a built-in version of echo which does not understand '-e'. Could you try to replace "echo -e bla" with "printf "bla". Kbuild.include uses some similar tricks but here printf is used. Maybe this can be dash compatible then Sam