From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 92B4BC433EF for ; Tue, 24 May 2022 18:58:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240513AbiEXS6P (ORCPT ); Tue, 24 May 2022 14:58:15 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52388 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238576AbiEXS6N (ORCPT ); Tue, 24 May 2022 14:58:13 -0400 Received: from gate.crashing.org (gate.crashing.org [63.228.1.57]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 514075B3C6 for ; Tue, 24 May 2022 11:58:12 -0700 (PDT) Received: from gate.crashing.org (localhost.localdomain [127.0.0.1]) by gate.crashing.org (8.14.1/8.14.1) with ESMTP id 24OIqnf7028066; Tue, 24 May 2022 13:52:49 -0500 Received: (from segher@localhost) by gate.crashing.org (8.14.1/8.14.1/Submit) id 24OIqmBx028065; Tue, 24 May 2022 13:52:48 -0500 X-Authentication-Warning: gate.crashing.org: segher set sender to segher@kernel.crashing.org using -f Date: Tue, 24 May 2022 13:52:47 -0500 From: Segher Boessenkool To: Pali =?iso-8859-1?Q?Roh=E1r?= Cc: Michael Ellerman , Benjamin Herrenschmidt , Paul Mackerras , linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] powerpc: e500: Fix compilation with gcc e500 compiler Message-ID: <20220524185247.GK25951@gate.crashing.org> References: <20220524093939.30927-1-pali@kernel.org> <20220524175955.GI25951@gate.crashing.org> <20220524181255.bmszzxmbwzv7zed7@pali> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20220524181255.bmszzxmbwzv7zed7@pali> User-Agent: Mutt/1.4.2.3i Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, May 24, 2022 at 08:12:55PM +0200, Pali Rohár wrote: > On Tuesday 24 May 2022 12:59:55 Segher Boessenkool wrote: > > On Tue, May 24, 2022 at 11:39:39AM +0200, Pali Rohár wrote: > > > gcc e500 compiler does not support -mcpu=powerpc option. When it is > > > specified then gcc throws compile error: > > > > > > gcc: error: unrecognized argument in option ‘-mcpu=powerpc’ > > > gcc: note: valid arguments to ‘-mcpu=’ are: 8540 8548 native > > > > What? Are you using some modified version of GCC, perhaps? > > Hello! I'm using official gcc version, no special modification. > > > No version of GCC that isn't hamstrung can have this output. > > gcc for e500 cores has really this output when you pass -mcpu=powerpc. > > Upstream gcc dropped support for e500 cores during development of > version 9. This isn't true. The SPE instruction extension is no longer supported (because it wasn't maintained). Everything else still works. > But you can still compile and install gcc 8.5.0 (last version > of gcc 8) which has this full e500 support. > > Really, you can easily try it. Debian 10 (Buster) has gcc 8.3.0 in its > default installation and also provides packages with cross compilers. > Just run 'sudo apt install gcc-powerpc-linux-gnuspe' on desktop amd64 > version of Debian 10, it will install e500 cross compiler. > > -mcpu=8540 specify e500v1 and -mcpu=8548 specify e500v2 Aha. Right, because this config forces -mspe it requires one of these CPUs. You can use a powerpc-linux compiler instead, and everything will just work. These CPUs are still supported, in all of GCC 9 .. GCC 12 :-) Segher