From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from terminus.zytor.com ([198.137.202.10]:45942 "EHLO mail.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755310Ab3GOWJo (ORCPT ); Mon, 15 Jul 2013 18:09:44 -0400 Message-ID: <51E472D4.5060307@zytor.com> Date: Mon, 15 Jul 2013 15:08:20 -0700 From: "H. Peter Anvin" MIME-Version: 1.0 Subject: Re: [PATCH -next 2/2] kbuild: fix for updated LZ4 tool with the new streaming format References: <1367829775-4434-1-git-send-email-kyungsik.lee@lge.com> <1367829775-4434-2-git-send-email-kyungsik.lee@lge.com> <20130712075602.GA4002@gmail.com> <20130715150342.35f7620ffe0835e3e2bc37d0@linux-foundation.org> In-Reply-To: <20130715150342.35f7620ffe0835e3e2bc37d0@linux-foundation.org> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Sender: linux-kbuild-owner@vger.kernel.org List-ID: To: Andrew Morton Cc: Ingo Molnar , Kyungsik Lee , Michal Marek , linux-kernel@vger.kernel.org, linux-kbuild@vger.kernel.org, x86@kernel.org, celinux-dev@lists.celinuxforum.org, linux-arm-kernel@lists.infradead.org, hyojun.im@lge.com, chan.jeong@lge.com, raphael.andy.lee@gmail.com, Ingo Molnar , Thomas Gleixner , Russell King , Borislav Petkov , Florian Fainelli , Yann Collet , Chanho Min On 07/15/2013 03:03 PM, Andrew Morton wrote: > > I don't know how to do this. Any suggestions? > > It has to be done at `make config' time. We'd need to probe for the > presence of lz4c and then.... what? > > Is there any precedent for this? > > I don't think we can just ignore the absence of lz4c - the user has > selected a config which his system cannot build. The problem lies > within randconfig itself. > We keep running over the need to be able to have kconfig run tests on the build system (for toolchain support or for optional tools needed); running them in the Makefiles (i.e. at Kbuild time) is simply too late. -hpa