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{ "id": 10072, "url": "https://patchwork.libcamera.org/api/patches/10072/?format=api", "web_url": "https://patchwork.libcamera.org/patch/10072/", "project": { "id": 1, "url": "https://patchwork.libcamera.org/api/projects/1/?format=api", "name": "libcamera", "link_name": "libcamera", "list_id": "libcamera_core", "list_email": "libcamera-devel@lists.libcamera.org", "web_url": "", "scm_url": "", "webscm_url": "" }, "msgid": "<20201015223750.58563-12-kieran.bingham@ideasonboard.com>", "date": "2020-10-15T22:37:50", "name": "[libcamera-devel,v2,11/11] meson: Enable shadowed variable warning", "commit_ref": null, "pull_url": null, "state": "accepted", "archived": false, "hash": "82b3b6f97c0f2c60b9440ae381c7af196b4cce87", "submitter": { "id": 4, "url": "https://patchwork.libcamera.org/api/people/4/?format=api", "name": "Kieran Bingham", "email": "kieran.bingham@ideasonboard.com" }, "delegate": null, "mbox": "https://patchwork.libcamera.org/patch/10072/mbox/", "series": [ { "id": 1376, "url": "https://patchwork.libcamera.org/api/series/1376/?format=api", "web_url": "https://patchwork.libcamera.org/project/libcamera/list/?series=1376", "date": "2020-10-15T22:37:39", "name": "Shadowed Variables", "version": 2, "mbox": "https://patchwork.libcamera.org/series/1376/mbox/" } ], "comments": "https://patchwork.libcamera.org/api/patches/10072/comments/", "check": "pending", "checks": "https://patchwork.libcamera.org/api/patches/10072/checks/", "tags": {}, "headers": { "Return-Path": "<libcamera-devel-bounces@lists.libcamera.org>", "X-Original-To": "parsemail@patchwork.libcamera.org", "Delivered-To": "parsemail@patchwork.libcamera.org", "Received": [ "from lancelot.ideasonboard.com (lancelot.ideasonboard.com\n\t[92.243.16.209])\n\tby patchwork.libcamera.org (Postfix) with ESMTPS id BCABEBE905\n\tfor <parsemail@patchwork.libcamera.org>;\n\tThu, 15 Oct 2020 22:38:04 +0000 (UTC)", "from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id 8590D610DD;\n\tFri, 16 Oct 2020 00:38:04 +0200 (CEST)", "from perceval.ideasonboard.com (perceval.ideasonboard.com\n\t[IPv6:2001:4b98:dc2:55:216:3eff:fef7:d647])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id D1573610C0\n\tfor <libcamera-devel@lists.libcamera.org>;\n\tFri, 16 Oct 2020 00:37:59 +0200 (CEST)", "from Q.local (cpc89244-aztw30-2-0-cust3082.18-1.cable.virginm.net\n\t[86.31.172.11])\n\tby perceval.ideasonboard.com (Postfix) with ESMTPSA id 54651A42;\n\tFri, 16 Oct 2020 00:37:59 +0200 (CEST)" ], "Authentication-Results": "lancelot.ideasonboard.com;\n\tdkim=fail reason=\"signature verification failed\" (1024-bit key;\n\tunprotected) header.d=ideasonboard.com header.i=@ideasonboard.com\n\theader.b=\"v67+ZtqV\"; dkim-atps=neutral", "DKIM-Signature": "v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com;\n\ts=mail; t=1602801479;\n\tbh=LSClShbT982AoXYBYL15w32WUSx2bAjx6qNPLuuZ4L8=;\n\th=From:To:Cc:Subject:Date:In-Reply-To:References:From;\n\tb=v67+ZtqVQeUd126p8fxpPX90GVAPHoUHXRET8/TefYPwGSoLBE3PfXz5BQvttdIDS\n\toa673PrkGqAS7huBtz4SJHlPuy+YJT37WRoVooi1IHVTpoC3q3+p+tGa6nHfi5bYHw\n\tS6CZ1W5NIOQABNnABKs4U1o9KnE+1b+MuN6GUkBw=", "From": "Kieran Bingham <kieran.bingham@ideasonboard.com>", "To": "libcamera devel <libcamera-devel@lists.libcamera.org>", "Date": "Thu, 15 Oct 2020 23:37:50 +0100", "Message-Id": "<20201015223750.58563-12-kieran.bingham@ideasonboard.com>", "X-Mailer": "git-send-email 2.25.1", "In-Reply-To": "<20201015223750.58563-1-kieran.bingham@ideasonboard.com>", "References": "<20201015223750.58563-1-kieran.bingham@ideasonboard.com>", "MIME-Version": "1.0", "Subject": "[libcamera-devel] [PATCH v2 11/11] meson: Enable shadowed variable\n\twarning", "X-BeenThere": "libcamera-devel@lists.libcamera.org", "X-Mailman-Version": "2.1.29", "Precedence": "list", "List-Id": "<libcamera-devel.lists.libcamera.org>", "List-Unsubscribe": "<https://lists.libcamera.org/options/libcamera-devel>,\n\t<mailto:libcamera-devel-request@lists.libcamera.org?subject=unsubscribe>", "List-Archive": "<https://lists.libcamera.org/pipermail/libcamera-devel/>", "List-Post": "<mailto:libcamera-devel@lists.libcamera.org>", "List-Help": "<mailto:libcamera-devel-request@lists.libcamera.org?subject=help>", "List-Subscribe": "<https://lists.libcamera.org/listinfo/libcamera-devel>,\n\t<mailto:libcamera-devel-request@lists.libcamera.org?subject=subscribe>", "Content-Type": "text/plain; charset=\"utf-8\"", "Content-Transfer-Encoding": "base64", "Errors-To": "libcamera-devel-bounces@lists.libcamera.org", "Sender": "\"libcamera-devel\" <libcamera-devel-bounces@lists.libcamera.org>" }, "content": "Shadowing variables can lead to unexpected bugs where a code path\nutilises a variable that may not have been intended by the developer,\nleading to hard to find bugs.\n\nEnable warnings for shadowed variables as defined at:\n https://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html#index-Wshadow\n\nAs an effect of utilising -Werror, this will cause variable or type\nshadowing to become a build-time error.\n\nSuggested-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>\nSigned-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>\nReviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>\nReviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>\n\n---\n\nThe reference here is that I lost around 2 hours digging into a bug that\nlooked like some other code path was calling a destructor or such, but\nwas because I had accidentally aliased a private member variable in the\nconstructor, so all my initialisation was lost after the constructor\ncompleted.\n\n meson.build | 1 +\n 1 file changed, 1 insertion(+)", "diff": "diff --git a/meson.build b/meson.build\nindex de15cc16da81..10423f523ca5 100644\n--- a/meson.build\n+++ b/meson.build\n@@ -38,6 +38,7 @@ if cc.has_header_symbol('stdlib.h', 'secure_getenv', prefix : '#define _GNU_SOUR\n endif\n \n common_arguments = [\n+ '-Wshadow',\n '-include', 'config.h',\n ]\n \n", "prefixes": [ "libcamera-devel", "v2", "11/11" ] }