220 29214 article Path: news.gmane.org!.POSTED!not-for-mail From: Miro Knejp Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: pragma once Date: Fri, 28 Oct 2016 20:57:33 +0200 Lines: 33 Approved: news@gmane.org Message-ID: References: <02DE7398-BA53-4C5C-82AB-C9116244406E@gmail.com> <2024406.5c6iCQq5hH@tjmaciei-mobl1> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: quoted-printable X-Trace: blaine.gmane.org 1477680968 576 195.159.176.226 (28 Oct 2016 18:56:08 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Fri, 28 Oct 2016 18:56:08 +0000 (UTC) User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:45.0) Gecko/20100101 Thunderbird/45.4.0 To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBC6ONSXJ54LBBNF6Z3AAKGQEPZPDCLI@isocpp.org Fri Oct 28 20:56:04 2016 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-lf0-f69.google.com ([209.85.215.69]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1c0CJe-0005u5-HK for gclcip-std-proposals@m.gmane.org; Fri, 28 Oct 2016 20:55:46 +0200 Original-Received: by mail-lf0-f69.google.com with SMTP id b75sf19145603lfg.3 for ; Fri, 28 Oct 2016 11:55:49 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=isocpp-org.20150623.gappssmtp.com; s=20150623; h=subject:to:references:from:message-id:date:user-agent:mime-version :in-reply-to:content-transfer-encoding:x-original-sender :x-original-authentication-results:reply-to:precedence:mailing-list :list-id:x-spam-checked-in-group:list-post:list-help:list-archive :list-subscribe:list-unsubscribe; bh=XR+jEHdLdV7vGkiauIwfWOSBenT0v/gL+WvolIuF5kY=; b=upxR048Q+7hx1xvlcfBkthZaYgr4xx5tNAxfatILXO01X5doUs1zcteOFSxeHq/bcB 0tcYZC88uIDRl5i8fgaCzCKWMW9VarXuxhIJDpU3GpCCh+ovQGpwt9/WmopHRTnUBn3z O+esV9J6tcSU0gh+GToVFr+jgqVQ8acg6M1VKQ+6tJi9Fn5wO6w9bKAlpTBKT7w9EnPI gJ4luowZCO6VkltaxbhfER+H2t6ySZYtdPRiXBho2Njm7T1pjt4tp9wd5c4bNP5EiW/e /+ifrtg4BOmkxzosO8Uper2oWvt84qqpoGfNECiJpV7GcGd56mmoy0UE4343xIuXG0K3 X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:subject:to:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-transfer-encoding :x-original-sender:x-original-authentication-results:reply-to :precedence:mailing-list:list-id:x-spam-checked-in-group:list-post :list-help:list-archive:list-subscribe:list-unsubscribe; bh=XR+jEHdLdV7vGkiauIwfWOSBenT0v/gL+WvolIuF5kY=; b=JKAx2xDQLrVnvDDKflxJVMX4uW7bZeHxT2SSyKR4un6xNtDbyUM5zzS3rToiVO0sSr +h0TnZrT9keORk3WD3Y/5xdvaunb16fxazZVuxj3q9oOM8W5T6veKNyyjzTDiczSROR/ gcjF+NzsnVYznPSJveCWdUod4Hke0xlCrnOJSIDczcieDhQbPGjYm3Yab1AEOzJjdmwr hFbFYFZxHeC07tGNA61EbJ1ejnEqbtZIDdUKUyNA1Tdwc0w5zKTQw84gU1Yix7AE2b15 spOdJcc8st/BtRmtRjE5XJFqx2HlPa1Pj3jhXghKiqFTL7b84bswlICaNvrqFwbwQOvI X-Gm-Message-State: ABUngvfUYasCMVeqdnlwrDLmCqu2z6iPzQ77sqE7vfeQ2x7NJUSIJHIle68BbPcKvH08Rg== X-Received: by 10.25.202.85 with SMTP id h21mr1350587lfj.0.1477680949221; Fri, 28 Oct 2016 11:55:49 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.28.209.78 with SMTP id i75ls568459wmg.9.canary-gmail; Fri, 28 Oct 2016 11:55:47 -0700 (PDT) X-Received: by 10.194.78.130 with SMTP id b2mr12483285wjx.29.1477680947872; Fri, 28 Oct 2016 11:55:47 -0700 (PDT) Original-Received: from mail-wm0-x22e.google.com (mail-wm0-x22e.google.com. [2a00:1450:400c:c09::22e]) by mx.google.com with ESMTPS id yo8si10454465wjc.268.2016.10.28.11.55.47 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 28 Oct 2016 11:55:47 -0700 (PDT) Received-SPF: pass (google.com: domain of miro.knejp@gmail.com designates 2a00:1450:400c:c09::22e as permitted sender) client-ip=2a00:1450:400c:c09::22e; Original-Received: by mail-wm0-x22e.google.com with SMTP id p190so30370144wmp.1 for ; Fri, 28 Oct 2016 11:55:47 -0700 (PDT) X-Received: by 10.28.15.17 with SMTP id 17mr144675wmp.55.1477680947342; Fri, 28 Oct 2016 11:55:47 -0700 (PDT) Original-Received: from [192.168.42.16] (ppp-93-104-124-59.dynamic.mnet-online.de. [93.104.124.59]) by smtp.gmail.com with ESMTPSA id kq7sm15472737wjb.0.2016.10.28.11.55.46 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 28 Oct 2016 11:55:46 -0700 (PDT) In-Reply-To: <2024406.5c6iCQq5hH@tjmaciei-mobl1> X-Original-Sender: miro.knejp@gmail.com X-Original-Authentication-Results: mx.google.com; dkim=pass header.i=@gmail.com; spf=pass (google.com: domain of miro.knejp@gmail.com designates 2a00:1450:400c:c09::22e as permitted sender) smtp.mailfrom=miro.knejp@gmail.com; dmarc=pass (p=NONE dis=NONE) header.from=gmail.com Precedence: list Mailing-list: list std-proposals@isocpp.org; contact std-proposals+owners@isocpp.org List-ID: X-Google-Group-Id: 399137483710 List-Post: , List-Help: , List-Archive: List-Subscribe: , List-Unsubscribe: , Xref: news.gmane.org gmane.comp.lang.c++.isocpp.proposals:29214 Archived-At: Am 28.10.2016 um 17:51 schrieb Thiago Macieira: > Em sexta-feira, 28 de outubro de 2016, =C3=A0s 17:07:42 PDT, Miro Knejp e= screveu: >> So you risk ending up using two versions of the same library in one >> executable? Yeah, right. That=E2=80=99s not going to cause problems at a= ll. I=E2=80=99m >> sorry but if one file includes "lib/1.1/lib.h" and another >> =E2=80=9Clib/latest/lib.h=E2=80=9D you really aren=E2=80=99t far away fr= om shooting yourself in the >> foot. > It can happen if the buildsystem does realname() and inserts the necessar= y -I > switches. > > Moreover, remember that the problem happens at the time of the compilatio= n of > the application on the user's machine, not on the application developer's > machine. You don't know what crazy things the user may do. > Honestly there is only a limited set of "crazy things" I'm willing to=20 prepare for when writing a library. Just because people can do some=20 things doesn't mean they should. There are limits to everything. --=20 You received this message because you are subscribed to the Google Groups "= ISO C++ Standard - Future Proposals" group. To unsubscribe from this group and stop receiving emails from it, send an e= mail to std-proposals+unsubscribe@isocpp.org. To post to this group, send email to std-proposals@isocpp.org. To view this discussion on the web visit https://groups.google.com/a/isocpp= ..org/d/msgid/std-proposals/db03c96d-6c85-8dce-3a63-626b1e21c7e4%40gmail.com= .. .