From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mp0 ([2001:41d0:2:4a6f::]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) by ms11 with LMTPS id QDavOUCdsF/0GwAA0tVLHw (envelope-from ) for ; Sun, 15 Nov 2020 03:15:12 +0000 Received: from aspmx1.migadu.com ([2001:41d0:2:4a6f::]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) by mp0 with LMTPS id AM1/NUCdsF+7dQAA1q6Kng (envelope-from ) for ; Sun, 15 Nov 2020 03:15:12 +0000 Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by aspmx1.migadu.com (Postfix) with ESMTPS id 502A79403AB for ; Sun, 15 Nov 2020 03:15:12 +0000 (UTC) Received: from localhost ([::1]:48286 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1ke8VS-0000uy-6V for larch@yhetil.org; Sat, 14 Nov 2020 22:15:10 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:53972) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1ke8VK-0000uk-J1 for bug-guix@gnu.org; Sat, 14 Nov 2020 22:15:02 -0500 Received: from debbugs.gnu.org ([209.51.188.43]:40791) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1ke8VK-0000lh-9l for bug-guix@gnu.org; Sat, 14 Nov 2020 22:15:02 -0500 Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1ke8VK-00006W-4a for bug-guix@gnu.org; Sat, 14 Nov 2020 22:15:02 -0500 Subject: bug#40406: python-matplotlib fails to build on i686-linux Resent-From: Maxim Cournoyer Original-Sender: "Debbugs-submit" Resent-To: bug-guix@gnu.org Resent-Date: Sun, 15 Nov 2020 03:15:01 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: cc-closed 40406 X-GNU-PR-Package: guix X-GNU-PR-Keywords: To: Diego Nicola Barbato Mail-Followup-To: 40406@debbugs.gnu.org, maxim.cournoyer@gmail.com, dnbarbato@posteo.de Received: via spool by 40406-done@debbugs.gnu.org id=D40406.1605410059310 (code D ref 40406); Sun, 15 Nov 2020 03:15:01 +0000 Received: (at 40406-done) by debbugs.gnu.org; 15 Nov 2020 03:14:19 +0000 Received: from localhost ([127.0.0.1]:52336 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1ke8Ud-00004u-Dh for submit@debbugs.gnu.org; Sat, 14 Nov 2020 22:14:19 -0500 Received: from mail-qv1-f52.google.com ([209.85.219.52]:37499) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1ke8UZ-0008WM-4G for 40406-done@debbugs.gnu.org; Sat, 14 Nov 2020 22:14:18 -0500 Received: by mail-qv1-f52.google.com with SMTP id v20so3780057qvx.4 for <40406-done@debbugs.gnu.org>; Sat, 14 Nov 2020 19:14:15 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:references:date:in-reply-to:message-id :user-agent:mime-version; bh=2+pddeo1yWW51vWWu/0F4btsF96za1ToDatf2efrdEc=; b=sM5Xh/vC2OX2Q4Htc27YZ21SO3BmiQIwyWsCMAm/gdGB5w4lHUbtQtVb3m55hEkdZH DwsXcaf1Sx4iy1/KVTwXnj3xpHxFHa4yh7kq81tagmtDNxf/7u9zoypvTSH/MZrl3ATx IIaIVpRyZFNkFKhI6Ml0DoKfJSO4ukpzSjlJAA72GUUgX9jlq3Q9eUukYmaWFqwEulVC O+8FiCkCAsttje/+pDPBziiX+8vZzEJ86cJuV2iFGDoGtRudAK5ZPi3pZXoVgbt3N/9Q j4O6Bh39bO8R0DXdWOVbhT7wlgNJAFMFob2/k7DTmrQl52ZqLVZ1wrkI1hlP0Lrgc752 tFug== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:references:date:in-reply-to :message-id:user-agent:mime-version; bh=2+pddeo1yWW51vWWu/0F4btsF96za1ToDatf2efrdEc=; b=qO0+mYw8A1MQZ3Tu7P5k5K8MHFMwaHSc3C9aeJABAXM5OxrCTgW+Rb8YRIZs7Hkump qIPOIjxdwq34XFiCK29MOt5lTOyRdwz/PmeqG7U7kwm6olAEz9Snsie+GDRHI/+vyBeO jyeCiahHH9C/i6fNzCnNU43oAa9b8+lGEx6LQ0B2BRQAMRVvj0mrwiwoJtQx+ZF9kVka YSYmkiGYnqrT/HYOTxlPxoiY0DhzsvTrJkjurhtKNHsaC5WrlcskFU0GkU9NKT+uYKy7 wKsjIgMSBea3gkaSxJ30fFoIsuNwTcu2QNgeKunviuGIVMaxKC3je70PLRcbeQTO+Oob txww== X-Gm-Message-State: AOAM5329AKTHgBbrCNO7tZgh+a5PzKhh6v168rgMuvoIbE1IRuvS14g9 JhY7WiEZaeXTu8WvcHqu1ex0CiYcno0= X-Google-Smtp-Source: ABdhPJzqs184OaXeUaK7bJRgsiNjdjugDWnWxUj1Z8ZMMF9pkeVOuiBGHfrlI6heEi/wyMIgioSlvQ== X-Received: by 2002:a05:6214:10cb:: with SMTP id r11mr9720040qvs.17.1605410049664; Sat, 14 Nov 2020 19:14:09 -0800 (PST) Received: from hurd (dsl-10-128-91.b2b2c.ca. [72.10.128.91]) by smtp.gmail.com with ESMTPSA id r16sm9178977qta.14.2020.11.14.19.14.08 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 14 Nov 2020 19:14:09 -0800 (PST) From: Maxim Cournoyer References: <87mu7s1tqv.fsf@GlaDOS.home> <20200403161802.GA3560@jasmine.lan> <878sh5a1bf.fsf@GlaDOS.home> <87zh9d8wn7.fsf@GlaDOS.home> Date: Sat, 14 Nov 2020 22:14:08 -0500 In-Reply-To: <87zh9d8wn7.fsf@GlaDOS.home> (Diego Nicola Barbato's message of "Mon, 08 Jun 2020 16:22:52 +0200") Message-ID: <877dqnfh1b.fsf@gmail.com> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/27.1 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain X-Spam-Score: 0.0 (/) X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list X-Spam-Score: -1.0 (-) X-BeenThere: bug-guix@gnu.org List-Id: Bug reports for GNU Guix List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: 40406-done@debbugs.gnu.org Errors-To: bug-guix-bounces+larch=yhetil.org@gnu.org Sender: "bug-Guix" X-Scanner: ns3122888.ip-94-23-21.eu Authentication-Results: aspmx1.migadu.com; dkim=fail (headers rsa verify failed) header.d=gmail.com header.s=20161025 header.b=sM5Xh/vC; dmarc=fail reason="SPF not aligned (relaxed)" header.from=gmail.com (policy=none); spf=pass (aspmx1.migadu.com: domain of bug-guix-bounces@gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=bug-guix-bounces@gnu.org X-Spam-Score: 0.09 X-TUID: lVgITKldkTV9 Hello Diego, Diego Nicola Barbato writes: > Hey, > > Diego Nicola Barbato writes: > > [...] > >> Apparently there is nothing wrong with the slider. Instead matrix >> multiplication, which is used under the hood for transformations, seems >> to sometimes produce incorrect results on i686-linux. I have reported >> this as a separate bug (https://debbugs.gnu.org/41665). > > I got this wrong: This issue isn't caused by the Numpy bug, since > Matplotlib doesn't use Numpy for transformations. Both bugs are caused > by the excess precision of the x87 FPU's floating point registers. > > I've attached a patch which makes sure that the C and C++ extensions are > compiled with -ffloat-store. This doesn't get rid of all possible > rounding errors but it's enough for the slider test to pass. Thanks for the investigationd and workaround! I've tested it and it seems to work well. I've pushed a slightly modified version to master as commit 81643c4cf3e61f5a98b92a72a92c230f5e7ca905. Thank you! Closing. Maxim