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 lists1p.gnu.org (lists1p.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id C6403CA5FD4 for ; Fri, 2 Oct 2026 10:40:13 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists1p.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1xCagB-0002lp-Hh; Fri, 02 Oct 2026 06:39:51 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists1p.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1xCag9-0002la-77 for qemu-devel@nongnu.org; Fri, 02 Oct 2026 06:39:49 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1xCag6-0005SJ-TM for qemu-devel@nongnu.org; Fri, 02 Oct 2026 06:39:48 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1790937585; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=JsotkiRqJNOLP4eOa87Rf+icCdglsik9GCZsRmYn8yA=; b=LQ4eJ/oEOKB8WWXwHuvjBLfWrXkZM13R2oFPIbaSt5U+XrEOIuoaz9C4ULYLz8EM9qeql+ nscedjj6c4+D846Y2Hnylyl0RJl+Uz7tXqWYlPIdsU4skrf9lIP1t4eoe9RNexP699ZCow LgzCUlsHMtlu0eoD6YFr3UY11nVx2hM= Received: from mx-prod-mc-06.mail-002.prod.us-west-2.aws.redhat.com (ec2-35-165-154-97.us-west-2.compute.amazonaws.com [35.165.154.97]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-317-Mvp4ydaQN66jifVIaeu4Dw-1; Fri, 02 Oct 2026 06:39:44 -0400 X-MC-Unique: Mvp4ydaQN66jifVIaeu4Dw-1 X-Mimecast-MFC-AGG-ID: Mvp4ydaQN66jifVIaeu4Dw_1790937583 Received: from mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.4]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-06.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 0830A1829E20; Fri, 2 Oct 2026 10:39:43 +0000 (UTC) Received: from blackfin.pond.sub.org (unknown [10.44.22.5]) by mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id BB47130000E4; Fri, 2 Oct 2026 10:39:42 +0000 (UTC) Received: by blackfin.pond.sub.org (Postfix, from userid 1000) id 4B9DC21E6A04; Fri, 02 Oct 2026 12:39:40 +0200 (CEST) From: Markus Armbruster To: Daniel P. =?utf-8?Q?Berrang=C3=A9?= Cc: qemu-devel@nongnu.org, Philippe =?utf-8?Q?Mathieu-Daud=C3=A9?= , Stefan Hajnoczi , =?utf-8?Q?Marc-Andr=C3=A9?= Lureau Subject: Re: [PATCH v2 01/20] osdep: add 'ignore_value(x)' macro In-Reply-To: <20261002095232.3605567-2-berrange@redhat.com> ("Daniel P. =?utf-8?Q?Berrang=C3=A9=22's?= message of "Fri, 2 Oct 2026 10:52:13 +0100") References: <20261002095232.3605567-1-berrange@redhat.com> <20261002095232.3605567-2-berrange@redhat.com> Date: Fri, 02 Oct 2026 12:39:40 +0200 Message-ID: <874if44c9f.fsf@pond.sub.org> User-Agent: Gnus/5.13 (Gnus v5.13) MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.4 Received-SPF: pass client-ip=170.10.129.124; envelope-from=armbru@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -23 X-Spam_score: -2.4 X-Spam_bar: -- X-Spam_report: (-2.4 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.331, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: qemu development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Daniel P. Berrang=C3=A9 writes: > Functions annotated with 'warn_unused_result' cannot be cast > to (void) to silence the compiler. Add the ignore_vaule() ignore_value() > macro which tricks the compiler into thinking the result is > genuinely used, avoiding the need for manual workarounds where > the return value is intentionally ignored. > > This clever macro is derived from one originating with the > GNULIB project: > > https://gitweb.git.savannah.gnu.org/gitweb/?p=3Dgnulib.git;a=3Dblob;f= =3Dlib/ignore-value.h;hb=3DHEAD > > but simplified since we don't need compat with old GCC and > optimizing on clang is overkill. > > Reviewed-by: Marc-Andr=C3=A9 Lureau > Signed-off-by: Daniel P. Berrang=C3=A9