From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752235AbcDUUbn (ORCPT ); Thu, 21 Apr 2016 16:31:43 -0400 Received: from eddie.linux-mips.org ([148.251.95.138]:56958 "EHLO cvs.linux-mips.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751041AbcDUUbm (ORCPT ); Thu, 21 Apr 2016 16:31:42 -0400 Date: Thu, 21 Apr 2016 22:31:35 +0200 From: Ralf Baechle To: Fengguang Wu Cc: kbuild-all@01.org, Paul Burton , linux-kernel@vger.kernel.org, Philip Li Subject: Re: [kbuild-all] mipsel-linux-gnu-gcc: error: unrecognized command line option '-mcompact-branches=optimal' Message-ID: <20160421203135.GJ24051@linux-mips.org> References: <201604201320.YHjfc2dZ%fengguang.wu@intel.com> <20160420133021.GG24051@linux-mips.org> <20160421045129.GB4038@wfg-t540p.sh.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20160421045129.GB4038@wfg-t540p.sh.intel.com> User-Agent: Mutt/1.5.24 (2015-08-30) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Apr 21, 2016 at 12:51:29PM +0800, Fengguang Wu wrote: > On Wed, Apr 20, 2016 at 03:30:21PM +0200, Ralf Baechle wrote: > > On Wed, Apr 20, 2016 at 01:44:28PM +0800, kbuild test robot wrote: > > > > > FYI, the error/warning still remains. > > > > > > tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master > > > head: 12566cc35d0e68308bde7aad615743d560cb097b > > > commit: c1a0e9bc885d46e519fd87d35af6a7937abfb986 MIPS: Allow compact branch policy to be changed > > > date: 6 months ago > > > config: mips-malta_qemu_32r6_defconfig (attached as .config) > > > reproduce: > > > wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross > > > chmod +x ~/bin/make.cross > > > git checkout c1a0e9bc885d46e519fd87d35af6a7937abfb986 > > > # save the attached .config to linux build tree > > > make.cross ARCH=mips > > > > > > All errors (new ones prefixed by >>): > > > > > > >> mipsel-linux-gnu-gcc: error: unrecognized command line option '-mcompact-branches=optimal' > > > >> mipsel-linux-gnu-gcc: error: unrecognized command line option '-mcompact-branches=optimal' > > > > -mcompact-branches=optimal is an option for the latest version of the MIPS > > architecture which is enabled by mips-malta_qemu_32r6_defconfig but your > > compiler is too old, doesn't support R6. Unfortunately there's no simple > > way to run a test on the build environment from kconfig or even before > > kconfig runs so we've just ignord this particular build issue. Plus > > there being the additional issue that we only know the toolchain to be > > used after certain options have been picked. > > We are running Debian's mips cross compiler. > > % mips-linux-gnu-gcc --version > mips-linux-gnu-gcc (Debian 5.2.1-16) 5.2.1 20150903 > Copyright (C) 2015 Free Software Foundation, Inc. > > How about temporarily disable that error, until we upgrade to a new > gcc version which supports the -mcompact-branches option? Let's try to sort this properly :) The culprit seems to be commit c1a0e9bc885d46e519fd87d35af6a7937abfb986 ("MIPS: Allow compact branch policy to be changed"). Paul, any reason why we don't offer the option of not using -mcompact-branches? It seems GCC 5.2 needs that. Ralf