Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754449AbbK0LgD (ORCPT ); Fri, 27 Nov 2015 06:36:03 -0500 Received: from mail-wm0-f47.google.com ([74.125.82.47]:33258 "EHLO mail-wm0-f47.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752475AbbK0Lf7 (ORCPT ); Fri, 27 Nov 2015 06:35:59 -0500 Date: Fri, 27 Nov 2015 12:35:55 +0100 From: Ingo Molnar To: Rabin Vincent Cc: Arnaldo Carvalho de Melo , "jolsa@kernel.org" , "namhyung@kernel.org" , Peter Zijlstra , "linux-kernel@vger.kernel.org" Subject: Re: [PATCHv2 3/3] perf: add helper makefile for cross compiling libs Message-ID: <20151127113555.GA15376@gmail.com> References: <1446104978-26429-1-git-send-email-rabin.vincent@axis.com> <1446104978-26429-3-git-send-email-rabin.vincent@axis.com> <20151029094649.GA6280@gmail.com> <20151106080917.GA12203@axis.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20151106080917.GA12203@axis.com> User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1858 Lines: 59 * Rabin Vincent wrote: > On Thu, Oct 29, 2015 at 10:46:49AM +0100, Ingo Molnar wrote: > > Would it be possible to add a gcc and glibc building portion as well? That would > > make it entirely self-hosting. > > Yes, but: > > - Those that intend to run the built binary on a target would presumably > already have a cross-compiler lying around which they use to build the > rest of userspace. > > - Those that don't have a cross-compiler or need a newer one can already > very easily create one using other specialized tools such as > crosstool-ng (see below). > > > > > Something like: > > > > make ARCH=arm BOOTSTRAP=1 > > > > ... would magically fetch everything needed, and (given enough Internet bandwidth > > and a fast enough machine) build a whole cross-environment from scratch. > > This is already possible using crosstool-ng. Getting an ARM GCC 5.2 > cross-compiler is as simple as: > > $ git clone git://crosstool-ng.org/crosstool-ng > $ cd crosstool-ng > $ ./bootstrap && ./configure --enable-local && make > > $ ./ct-ng arm-unknown-linux-gnueabi > $ ./ct-ng build My point is, that's 5 non-trivial steps harder than just typing: make ARCH=arm BOOTSTRAP=1 > This is also possible with crosstool-ng. You just need to build the > x86_64-unknown-linux-gnu config to get GCC 5.2 + glibc 2.22 toolchain > for an x86-64 host. It's also possibly by directly cloning the repos of those tools and building them - they are reasonably easy to build. My point is that if we add automation, we might as well walk to whole mile. Thanks, Ingo -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/