From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <SRS0=d573=63=deneb.enyo.de=fw@sourceware.org>
Received: from albireo.enyo.de (albireo.enyo.de [37.24.231.21])
	by sourceware.org (Postfix) with ESMTPS id 731B23858D28;
	Fri,  3 Mar 2023 20:15:19 +0000 (GMT)
DMARC-Filter: OpenDMARC Filter v1.4.2 sourceware.org 731B23858D28
Authentication-Results: sourceware.org; dmarc=none (p=none dis=none) header.from=deneb.enyo.de
Authentication-Results: sourceware.org; spf=pass smtp.mailfrom=deneb.enyo.de
Received: from [172.17.203.2] (port=53915 helo=deneb.enyo.de)
	by albireo.enyo.de ([172.17.140.2]) with esmtps (TLS1.3:ECDHE_SECP256R1__RSA_PSS_RSAE_SHA256__AES_256_GCM:256)
	id 1pYBo9-0005xS-Hl; Fri, 03 Mar 2023 20:15:13 +0000
Received: from fw by deneb.enyo.de with local (Exim 4.94.2)
	(envelope-from <fw@deneb.enyo.de>)
	id 1pYBo9-000DZP-88; Fri, 03 Mar 2023 21:15:13 +0100
From: Florian Weimer <fw@deneb.enyo.de>
To: Alexandre Oliva via Gcc-patches <gcc-patches@gcc.gnu.org>
Cc: Jonathan Wakely <jwakely@redhat.com>,  Alexandre Oliva
 <oliva@adacore.com>,  Jonathan Wakely <jwakely.gcc@gmail.com>,
  "libstdc++" <libstdc++@gcc.gnu.org>,  Bernd Edlinger
 <bernd.edlinger@hotmail.de>
Subject: Re: [libstdc++] Use __gthread_join in jthread/95989
References: <oredqou760.fsf@lxoliva.fsfla.org>
	<CAH6eHdS94kvLApbEtzrDhCEyS7ca_8FGZ60HG5AV-E15cXe0Kg@mail.gmail.com>
	<or356ml02u.fsf@lxoliva.fsfla.org>
	<CACb0b4nXs3haiCsxCAVBnfgRjVPxj60YZwv6mOPd7Uw+d-MdPw@mail.gmail.com>
	<CACb0b4k45RJoiFF38ZeDamQ5sasXCO6oQ4eH_=4SmfK0DhxFHA@mail.gmail.com>
	<orsfeliv75.fsf@lxoliva.fsfla.org>
	<CACb0b4=zWKsyf3=fK0gOem7vK1qKZNwyx61ActfpJ695xhZVoA@mail.gmail.com>
	<CACb0b4kp2qdswziNH6rh30Q36Y4Be36Bt2W1w7BNOktVftikDA@mail.gmail.com>
	<orfsalip8u.fsf@lxoliva.fsfla.org>
Date: Fri, 03 Mar 2023 21:15:13 +0100
In-Reply-To: <orfsalip8u.fsf@lxoliva.fsfla.org> (Alexandre Oliva via
	Gcc-patches's message of "Fri, 03 Mar 2023 16:55:29 -0300")
Message-ID: <87ttz1r3qm.fsf@mid.deneb.enyo.de>
MIME-Version: 1.0
Content-Type: text/plain
X-Spam-Status: No, score=-5.6 required=5.0 tests=BAYES_00,KAM_DMARC_STATUS,KAM_NUMSUBJECT,SPF_HELO_NONE,SPF_PASS,TXREP autolearn=no autolearn_force=no version=3.4.6
X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org
List-Id: <gcc-patches.gcc.gnu.org>

* Alexandre Oliva via Gcc-patches:

> +    // Make sure it's not optimized out, not even with LTO.
> +    asm ("" : : "rm" (depend));

If the m constraint is used, this may never emit the symbol name and
thus not create a reference after all.