From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <ville.voutilainen@gmail.com>
Received: from mail-qk1-x744.google.com (mail-qk1-x744.google.com
 [IPv6:2607:f8b0:4864:20::744])
 by sourceware.org (Postfix) with ESMTPS id AD5383861896
 for <libc-alpha@sourceware.org>; Mon, 21 Sep 2020 22:14:08 +0000 (GMT)
DMARC-Filter: OpenDMARC Filter v1.3.2 sourceware.org AD5383861896
Received: by mail-qk1-x744.google.com with SMTP id 16so17027160qkf.4
 for <libc-alpha@sourceware.org>; Mon, 21 Sep 2020 15:14:08 -0700 (PDT)
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
 d=1e100.net; s=20161025;
 h=x-gm-message-state:mime-version:references:in-reply-to:from:date
 :message-id:subject:to:cc;
 bh=+saMWJuQTmqcCdBssmwLmVxC0GJzVLZTyiDjI7NZXn0=;
 b=n41lFLvrwPhghnxw9C4hACdk8ZmG5rgtEkRYHdJzicB+1vOlCWC8YuQdxRxJzuGYHU
 g7HO6wrcCaaxe/8CLln6OWbvKJ6NKwg/yX7QKLvVdgjiwrjHXL1aPpvDfottndU1Z8uo
 6au2zLXlPwN+xmwMhNwHcOLbWkUMDGG9b93zOD26YOGnozoSDXLRVUNa7irFOrtxkDHi
 3OgGrMCv8EqvtpG9maEcJBrIhHvRLbkn+IENPWWm8ZzGsFvdEhtkBUBidFfmj/JiLRif
 jb/v8/H/f0VpTdw2yKJEG/Yjkoo3JNhLq1+EJo9IUGjlnWIZd3n6PyDQRppaRVd2FOI0
 pO2Q==
X-Gm-Message-State: AOAM530MryvhvbFpah3mrO/WVxf1uCCUTuLEGVsf7YAS+F8BPIqakP6Z
 tr/zI2vO2iCx8nAniCJHU0T+gEqKnpVsVRNyrZw=
X-Google-Smtp-Source: ABdhPJwnTL6KhetBtWPTZVfF7PDj22JkWVaiL3h/8Mnu1xK0xg5k/GOtgMQW8evi2EwJ5Vvc6/ONmNQsZeOr5gcCvdE=
X-Received: by 2002:a37:7e42:: with SMTP id z63mr2036242qkc.62.1600726448381; 
 Mon, 21 Sep 2020 15:14:08 -0700 (PDT)
MIME-Version: 1.0
References: <946e9377-0558-3adf-3eb9-38c507afe2d0@gmail.com>
 <874knr8qyl.fsf@oldenburg2.str.redhat.com>
 <dbcf5c85-c468-72f8-0f83-92ec2a6a2991@gmail.com>
 <875z875si2.fsf@oldenburg2.str.redhat.com>
 <20200921140100.GA449323@redhat.com>
 <e734429a-d543-7e75-48e9-a8297a94b035@gmail.com>
 <20200921220443.GP6061@redhat.com>
In-Reply-To: <20200921220443.GP6061@redhat.com>
From: Ville Voutilainen <ville.voutilainen@gmail.com>
Date: Tue, 22 Sep 2020 01:13:57 +0300
Message-ID: <CAFk2RUbEtvgFb_FZmcM9L4-g1kG_E7S2p9gveM0Z5Fe=zEDm9w@mail.gmail.com>
Subject: Re: Expose 'array_length()' macro in <sys/param.h>
To: Jonathan Wakely <jwakely@redhat.com>
Cc: Alejandro Colomar <colomar.6.4.3@gmail.com>,
 Florian Weimer <fweimer@redhat.com>, gcc@gcc.gnu.org, 
 "libstdc++" <libstdc++@gcc.gnu.org>, Libc-alpha <libc-alpha@sourceware.org>, 
 libc-coord@lists.openwall.com
Content-Type: text/plain; charset="UTF-8"
X-Spam-Status: No, score=-1.7 required=5.0 tests=BAYES_00, DKIM_SIGNED,
 DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, FREEMAIL_FROM, RCVD_IN_DNSWL_NONE,
 SPF_HELO_NONE, SPF_PASS, TXREP autolearn=ham autolearn_force=no version=3.4.2
X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on
 server2.sourceware.org
X-BeenThere: libc-alpha@sourceware.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: Libc-alpha mailing list <libc-alpha.sourceware.org>
List-Unsubscribe: <https://sourceware.org/mailman/options/libc-alpha>,
 <mailto:libc-alpha-request@sourceware.org?subject=unsubscribe>
List-Archive: <https://sourceware.org/pipermail/libc-alpha/>
List-Post: <mailto:libc-alpha@sourceware.org>
List-Help: <mailto:libc-alpha-request@sourceware.org?subject=help>
List-Subscribe: <https://sourceware.org/mailman/listinfo/libc-alpha>,
 <mailto:libc-alpha-request@sourceware.org?subject=subscribe>
X-List-Received-Date: Mon, 21 Sep 2020 22:14:09 -0000

On Tue, 22 Sep 2020 at 01:07, Jonathan Wakely via Libstdc++
<libstdc++@gcc.gnu.org> wrote:
> >#  define array_length(arr)    (std:size(arr))
>
> C++ programmers will not accept a macro for this.

..in other words, the C++17 version of it needs to be an inline
function that returns std::size of an array,
not a macro. All C++ versions need to be functions, and there should
not be any #defines in any of the
C++ code.

Why should this be array_length and not __array_length? This is a
vendor extension, so it should use
a name that is reserved for such?