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 X-Spam-Level: X-Spam-Status: No, score=-5.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7810EC4338F for ; Sun, 22 Aug 2021 12:17:34 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id E4D0761247 for ; Sun, 22 Aug 2021 12:17:33 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org E4D0761247 Authentication-Results: mail.kernel.org; dmarc=fail (p=quarantine dis=none) header.from=crudebyte.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=nongnu.org Received: from localhost ([::1]:39000 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1mHmPs-0003jL-Sf for qemu-devel@archiver.kernel.org; Sun, 22 Aug 2021 08:17:32 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:59896) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mHmPI-00033n-Dj for qemu-devel@nongnu.org; Sun, 22 Aug 2021 08:16:56 -0400 Received: from kylie.crudebyte.com ([5.189.157.229]:58975) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mHmPG-0004Az-Jq for qemu-devel@nongnu.org; Sun, 22 Aug 2021 08:16:56 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=crudebyte.com; s=kylie; h=Content-Type:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From: Content-ID:Content-Description; bh=v0VC4XFC1zzWVxw8kVgNq0Ql042DmOVXx6bX/71BZ4o=; b=E4Epdh15o/UOzvl9T3W3A1qqmU cFG4l7ZV7ZaVSCirz8+Ah8v3bBa9wlQuSbx6k+fYWQwfGBrRmE8lVf0cWNLIKyWTZTUUxOUEtLUMo YQpVrEk4GqkpaLHNshhHuS36CrvLB5+IAjNhu/Z439q9GOUcHA/weaE0TxH+j7l/76kJGx9hi0+zk vca1Erwcir4/CRxGh/2qrihyScMDZo+NH6wRqABsO/SR5bpOqhPdO4x8Ie2Pbcc6ZIp21SdbqrnM3 J8jjaBz3OUTWFuMk+J4COiIGSaQJ8kgVVR48NLiKkJUWqQbciQcqnO1e8LsmYmthh3T/GtBTMk+sv k6bIkEYjyX13IclNVt4SWfdoFwSisMEVbVJogRMK9q4JOX6LACRDRm0wJCayzKkQ9GhxrOzsEyIXY uMA7sykZHvNCHF1naqwZp00NaxQh0djMCrUlBDlTZJFRyJcFd6g7IT+9mRUtzVJQ5qfJ/TBt5O4cQ d35nk5k2+kKfr5wu5pGVIAbNrMs9hCKKdCNkgjUAWAaRZ1RT0FdWBTyPpPI6mF6wrDdyAlQW4AhmA 5HSJYqczAAnbjGmd7oC4RTKRD5RCtbrbOo1BE6HcJwwIcA2HpGx5MjDELsF25ahCpOgEi82KMH4Vw C/DSoSIlkrTagdGAHCPWsoUmii+y0uFY14L67BylU=; From: Christian Schoenebeck To: qemu-devel@nongnu.org Cc: Richard Henderson , Greg Kurz Subject: Re: [PATCH 2/5] qemu/qarray.h: weak scalar type check in QARRAY_CREATE() Date: Sun, 22 Aug 2021 14:16:48 +0200 Message-ID: <2359803.oK9D7Rh7IG@silver> In-Reply-To: <85cd9b4b-9137-d4c8-a12e-79d6e5790a36@linaro.org> References: <85cd9b4b-9137-d4c8-a12e-79d6e5790a36@linaro.org> MIME-Version: 1.0 Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="us-ascii" Received-SPF: pass client-ip=5.189.157.229; envelope-from=qemu_oss@crudebyte.com; helo=kylie.crudebyte.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_HELO_NONE=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: 2.1.23 Precedence: list List-Id: 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" On Sonntag, 22. August 2021 06:11:58 CEST Richard Henderson wrote: > On 8/21/21 1:30 PM, Christian Schoenebeck wrote: > > Unfortunately something like > > > > _Static_assert(typeof(a) == typeof(b), "type mismatch"); > > > > is currently not suported by C. So for the time being at least > > check that the size of the scalar types match at compile time. > > Did you try > _Static_assert(__builtin_types_compatible_p(X, Y), "type mismatch"); > > > r~ Ah, you are right. I was trying it, but now as you pointed me at it again, I realized I was just missing something. The specific use case here is like: struct Foo { ... } Foo; Foo *var; _Static_assert(__builtin_types_compatible_p(Foo, typeof(*var)), "type mismatch"); So I was missing the typeof() keyword to deduce the scalar type from the passed variable. I'll send a v2. Thanks! Best regards, Christian Schoenebeck