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Received-SPF: Pass (protection.outlook.com: domain of arm.com designates 40.67.248.234 as permitted sender) receiver=protection.outlook.com; client-ip=40.67.248.234; helo=nebula.arm.com; Received: from nebula.arm.com (40.67.248.234) by VE1EUR03FT051.mail.protection.outlook.com (10.152.19.75) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.20.4801.14 via Frontend Transport; Thu, 16 Dec 2021 14:52:38 +0000 Received: from AZ-NEU-EX04.Arm.com (10.251.24.32) by AZ-NEU-EX04.Arm.com (10.251.24.32) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2308.20; Thu, 16 Dec 2021 14:52:37 +0000 Received: from e124257 (10.34.101.64) by mail.arm.com (10.251.24.32) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2308.20 via Frontend Transport; Thu, 16 Dec 2021 14:52:36 +0000 From: Andrea Corallo To: Richard Earnshaw via Gcc-patches CC: Tejas Belagod , Richard Earnshaw , Richard Earnshaw Subject: Re: [Patch 8/8, Arm, GCC] Introduce multilibs for PACBTI target feature. [Was RE: [Patch 7/7, Arm, GCC] Introduce multilibs for PACBTI target feature.] References: <93f632b6-4eb9-f709-1f02-fddb7c3a03a8@foss.arm.com> Date: Thu, 16 Dec 2021 15:52:36 +0100 In-Reply-To: <93f632b6-4eb9-f709-1f02-fddb7c3a03a8@foss.arm.com> (Richard Earnshaw via Gcc-patches's message of "Tue, 7 Dec 2021 14:56:44 +0000") Message-ID: User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.90 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain X-EOPAttributedMessage: 1 X-MS-Office365-Filtering-Correlation-Id: a4cbd0eb-1766-4725-e671-08d9c0a3bff8 X-MS-TrafficTypeDiagnostic: HE1PR0801MB2060:EE_|DB5EUR03FT064:EE_|HE1PR0802MB2298:EE_ X-Microsoft-Antispam-PRVS: x-checkrecipientrouted: true NoDisclaimer: true X-MS-Oob-TLC-OOBClassifiers: OLM:9508;OLM:9508; X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam-Untrusted: BCL:0; X-Microsoft-Antispam-Message-Info-Original: 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 X-Forefront-Antispam-Report-Untrusted: CIP:40.67.248.234; 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OK for trunk? >>> >>> 2021-10-04 Tejas Belagod >>> >>> gcc/ChangeLog: >>> >>> * config/arm/t-rmprofile: Add multilib rules for +pacbti. >> This patch adds a multilib for pacbti target feature. >> 2021-10-04 Tejas Belagod >> gcc/ChangeLog: >> * config/arm/t-rmprofile: Add multilib rules for +pacbti. >> Tested the following configurations, OK for trunk? >> -mthumb/-march=armv8.1-m.main+pacbti/-mfloat-abi=soft >> -marm/-march=armv7-a/-mfpu=vfpv3-d16/-mfloat-abi=softfp >> mcmodel=small and tiny >> aarch64-none-linux-gnu native test and bootstrap >> Thanks, >> Tejas. >> > > I can't decide whether this is too much, or too little. But it > doesn't feel right as it is. > > Ideally we don't want yet another multilib. It would be better to > have one of the existing multilib variants made pac/bti safe. Right, which one do you think we want to pick? Thanks Andrea