From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from smtp.polymtl.ca (smtp.polymtl.ca [132.207.4.11]) by sourceware.org (Postfix) with ESMTPS id 7D261385802A; Sun, 20 Jun 2021 12:38:15 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org 7D261385802A Received: from simark.ca (simark.ca [158.69.221.121]) (authenticated bits=0) by smtp.polymtl.ca (8.14.7/8.14.7) with ESMTP id 15KCc8S2029447 (version=TLSv1/SSLv3 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Sun, 20 Jun 2021 08:38:13 -0400 DKIM-Filter: OpenDKIM Filter v2.11.0 smtp.polymtl.ca 15KCc8S2029447 Received: from [10.0.0.11] (192-222-157-6.qc.cable.ebox.net [192.222.157.6]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by simark.ca (Postfix) with ESMTPSA id 5C7BE1E939; Sun, 20 Jun 2021 08:38:08 -0400 (EDT) Subject: Re: [PATCH] nptl: Export libthread_db-used symbols under GLIBC_PRIVATE To: Florian Weimer , libc-alpha@sourceware.org Cc: gdb@sourceware.org References: <877disuwfq.fsf@oldenburg.str.redhat.com> From: Simon Marchi Message-ID: <4df1e03a-eead-82b2-289f-b6cb7ddc0159@polymtl.ca> Date: Sun, 20 Jun 2021 08:38:07 -0400 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 MIME-Version: 1.0 In-Reply-To: <877disuwfq.fsf@oldenburg.str.redhat.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-Poly-FromMTA: (simark.ca [158.69.221.121]) at Sun, 20 Jun 2021 12:38:08 +0000 X-Spam-Status: No, score=-3.3 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, NICE_REPLY_A, RCVD_IN_MSPIKE_H3, RCVD_IN_MSPIKE_WL, SPF_HELO_PASS, SPF_PASS, TXREP, URIBL_BLACK autolearn=no autolearn_force=no version=3.4.2 X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on server2.sourceware.org X-BeenThere: gdb@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Gdb mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 20 Jun 2021 12:38:16 -0000 On 2021-06-17 3:23 p.m., Florian Weimer via Gdb wrote: > Kevin, this *almost* gives us the perfect debugging experience with your > patched GDB in Fedora 35, according to my preliminary tests. A build > with the patch is running here: > > > > However, it seems that GDB still needs pthread_create in the .symtab to > trigger loading of libpthread_db. A fully stripped libc.so.6 without > .symtab does not trigger loading in my experiments. (The other symbols > we preserve for valgrind's sake and are immaterial to GDB.) In other > words, Stupid question, but: since pthread_create is a function exposed by the libc.so shared library, won't there still be an entry for it in .dynsym? And if so, shouldn't GDB see it? Simon