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Lu" , Florian Weimer CC: Wilco Dijkstra via Libc-alpha , Szabolcs Nagy Subject: Re: [PATCH 2/3] Revert "[AArch64][BZ #17711] Fix extern protected data handling" Thread-Topic: [PATCH 2/3] Revert "[AArch64][BZ #17711] Fix extern protected data handling" Thread-Index: AQHYb3AQ5vf+RU34WECR0bcI7jSh4q0uk9gAgAE6UOaAABuQDoAAJ+oAgAFzTuU= Date: Thu, 26 May 2022 19:17:49 +0000 Message-ID: References: <87mtf5wk0k.fsf@oldenburg.str.redhat.com> In-Reply-To: Accept-Language: en-GB, en-US Content-Language: en-GB X-MS-Has-Attach: X-MS-TNEF-Correlator: msip_labels: Authentication-Results-Original: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=arm.com; X-MS-Office365-Filtering-Correlation-Id: ccead43c-fff1-464a-7f55-08da3f4c7728 x-ms-traffictypediagnostic: PA4PR08MB6142:EE_|DBAEUR03FT008:EE_|VI1PR08MB3134:EE_ X-Microsoft-Antispam-PRVS: x-checkrecipientrouted: true nodisclaimer: true X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam-Untrusted: BCL:0; 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An undefined symbol will be imported from a shared= =0A= > library.=0A= =0A= LTO allows you to determine which symbols are imported indeed, so the=0A= compiler can use a GOT indirection without requiring explicit import=0A= annotations.=0A= =0A= However LTO does not solve all the code quality issues of FPIC - there is s= till no inlining, internal calls indirect via the PLT and non-static global= s use a GOT=0A= indirection. The goal here is to have a new option that generates efficient= code=0A= by default that just works for most projects.=0A= =0A= Cheers,=0A= Wilco=0A=