From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from simark.ca by simark.ca with LMTP id nBs9HIWxamOYXxUAWB0awg (envelope-from ) for ; Tue, 08 Nov 2022 14:44:05 -0500 Received: by simark.ca (Postfix, from userid 112) id 67A541E124; Tue, 8 Nov 2022 14:44:05 -0500 (EST) X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on simark.ca X-Spam-Level: X-Spam-Status: No, score=-5.2 required=5.0 tests=BAYES_00,MAILING_LIST_MULTI, NICE_REPLY_A,RCVD_IN_DNSWL_MED,RDNS_DYNAMIC,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.6 Received: from sourceware.org (ip-8-43-85-97.sourceware.org [8.43.85.97]) (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 simark.ca (Postfix) with ESMTPS id DF40E1E0CB for ; Tue, 8 Nov 2022 14:44:04 -0500 (EST) Received: from server2.sourceware.org (localhost [IPv6:::1]) by sourceware.org (Postfix) with ESMTP id 44B88385843B for ; Tue, 8 Nov 2022 19:44:02 +0000 (GMT) Received: from mail-wr1-f43.google.com (mail-wr1-f43.google.com [209.85.221.43]) by sourceware.org (Postfix) with ESMTPS id 1C7093858CDA for ; Tue, 8 Nov 2022 19:43:49 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org 1C7093858CDA Authentication-Results: sourceware.org; dmarc=none (p=none dis=none) header.from=palves.net Authentication-Results: sourceware.org; spf=pass smtp.mailfrom=gmail.com Received: by mail-wr1-f43.google.com with SMTP id w14so22645710wru.8 for ; Tue, 08 Nov 2022 11:43:49 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:content-language:in-reply-to:mime-version :user-agent:date:message-id:from:references:to:subject :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=c8tW70cbBO8tuJTaCGcSQZ2e70lbnvQMfGM+dMsWmsM=; b=dlM8VlkR5+HRgnvRCT3ZnI2JOkEF3VLuJjpe1q6Of4lUqoebYwk+JQvxp2wn+7q9Vx hedcsoLHEhsez7Zyt7ZaCfdGRzeECEpLRvdOuJuVzzOWQF/WjgvFrDE77Qn4RUnYq26+ yduHE3YjM5zaJs68ZSYt8/G0mgjjr0S6NpA4zIhPZqvHt97RGO3Z/gIrfsgQL7D4//+D ZHfKcx/jJtFnphXzX0XbttgSp8XfShzbwLHC0S4ONJ3RZVmg0joZn4lUQJeWeSPqipO6 zyh0F2H7/lxXV9rhtPjn1UP9zHTM/lQ/FjLbaW6rKxoBQFyf3wetMBhZR70oOeudy+Op hxig== X-Gm-Message-State: ACrzQf1EPVSc0qX4PmuefXs05odHeCDqgxWYJYV66KDkldrsqpYPyoXD TnOJLyzXBXQvTHjWpjDj55EO/iRjVsA= X-Google-Smtp-Source: AMsMyM4pFsIkex8f/AUKKU7eRQnPsiIzd7Ey8YgVBAPHy52/gpGIZFOzk2SRPEDNUEUoWd85CsawhA== X-Received: by 2002:a5d:4b04:0:b0:235:f22b:6621 with SMTP id v4-20020a5d4b04000000b00235f22b6621mr36006154wrq.462.1667936627572; Tue, 08 Nov 2022 11:43:47 -0800 (PST) Received: from ?IPv6:2001:8a0:f93a:3b00:e038:5cdc:b8bf:4653? ([2001:8a0:f93a:3b00:e038:5cdc:b8bf:4653]) by smtp.gmail.com with ESMTPSA id v18-20020a5d4b12000000b002365f326037sm13489342wrq.63.2022.11.08.11.43.47 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 08 Nov 2022 11:43:47 -0800 (PST) Subject: Re: [PATCH] gdb: make "start" breakpoint inferior-specific To: Simon Marchi , gdb-patches@sourceware.org References: <20220804174035.2441960-1-simon.marchi@efficios.com> From: Pedro Alves Message-ID: Date: Tue, 8 Nov 2022 19:43:46 +0000 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.10.1 MIME-Version: 1.0 In-Reply-To: <20220804174035.2441960-1-simon.marchi@efficios.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-BeenThere: gdb-patches@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Gdb-patches mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: gdb-patches-bounces+public-inbox=simark.ca@sourceware.org Sender: "Gdb-patches" On 2022-08-04 6:40 p.m., Simon Marchi via Gdb-patches wrote: > +int > +main (int argc, const char **argv) > +{ > + if (argc == 999) > + return 0; > + > + for (;;) > + main (999, NULL); > + Calling main triggers undefined behavior. The C++ Standard says [1] "The function main shall not be used within a program." E.g., on some targets, global constructors are called from the start of main, by a magic call the compiler injects. Calling main like that would run global ctors twice on such ports. [1] https://eel.is/c++draft/basic.start.main#3