[{"id":1777680,"web_url":"http://patchwork.ozlabs.org/comment/1777680/","msgid":"<59CE8698.4000902@arm.com>","list_archive_url":null,"date":"2017-09-29T17:44:56","subject":"Re: Prefer new libm function wrappers for !LIBM_SVID_COMPAT\n\t[committed]","submitter":{"id":65667,"url":"http://patchwork.ozlabs.org/api/people/65667/","name":"Szabolcs Nagy","email":"szabolcs.nagy@arm.com"},"content":"On 06/09/17 00:36, Joseph Myers wrote:\n> The initial obsoletion of SVID libm error handling left the old\n> wrappers and __kernel_standard still being used for new ports and\n> static linking, just with macro definitions of _LIB_VERSION and\n> matherr that meant symbols with those names were never actually used\n> and the code for different error handling variants could be optimized\n> out.\n> \n> This patch cleans things up further by eliminating the\n> __kernel_standard use for new ports and static linking. Now, the old\n> wrappers no longer generate any code in the !LIBM_SVID_COMPAT case,\n> while the new errno-only wrappers that were added for float128 support\n> are now also used for float, double and long double in that case.\n> \n> The changes are generally straightforward. The w_scalb*_compat\n> wrappers continue to be used (scalb is obsolescent in the sense of not\n> being supported for float128, but is present in supported standards -\n> the 2001 edition of POSIX and earlier XSI versions - so remains\n> supported for static linking and new ports, as do the float and long\n> double variants that are existing GNU extensions). Those wrappers\n> would only call __kernel_standard in the _LIB_VERSION == _SVID_ case.\n> Since we would like to be able to compile most of glibc without\n> optimization, relying on a static function whose only use is under an\n> if (0) condition being optimized away to avoid an undefined\n> __kernel_standard reference may not be a good idea. Thus, the\n> relevant code in the scalb wrappers has LIBM_SVID_COMPAT conditionals\n> added to guarantee it's not built at all in the case where\n> __kernel_standard does not exist.\n> \n> Just as i386 has its own w_sqrt_compat.c, so w_sqrt.c is also added.\n> ia64 gets dummy w_*.c to prevent those files being built where they\n> would conflict with the ia64 libm, as with its existing w_*_compat.c.\n> \n> Conditions disabling code for !LIBM_SVID_COMPAT are needed in both the\n> math/ wrappers and in the long double wrappers in ldbl-opt (to avoid\n> them setting up aliases and symbol versions for undefined symbols). I\n> hope that future cleanups to how libm function aliases and symbol\n> versioning are done will eliminate the need for most of the ldbl-opt\n> wrappers.\n> \n> Tested for x86_64 and x86, and with build-many-glibcs.py. Committed.\n> \n> 2017-09-05 Joseph Myers \n> \n> \t* sysdeps/generic/math-type-macros-double.h: Include\n> \t.\n> \t(__USE_WRAPPER_TEMPLATE): Define to !LIBM_SVID_COMPAT.\n> \t* sysdeps/generic/math-type-macros-float.h: Include\n> \t.\n> \t(__USE_WRAPPER_TEMPLATE): Define to !LIBM_SVID_COMPAT.\n> \t* sysdeps/generic/math-type-macros-ldouble.h: Include\n> \t.\n> \t(__USE_WRAPPER_TEMPLATE): Define to !LIBM_SVID_COMPAT.\n> \t* math/lgamma-compat.h (BUILD_LGAMMA): Include LIBM_SVID_COMPAT\n> \tcondition.\n\ni think this change made the gammaf, gamma, gammal\nweak aliases disappear on new targets.\n\n(at least i don't have those symbols after i rebase\nthe arm/ilp32 patches now, they used to come from\nmath/w_lgamma*_compat2.os)\n\ni don't think it's safe to remove them for new targets\nsince they are still in the public math.h","headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":["patchwork-incoming@bilbo.ozlabs.org","mailing list libc-alpha@sourceware.org"],"Authentication-Results":["ozlabs.org;\n\tspf=pass (mailfrom) smtp.mailfrom=sourceware.org\n\t(client-ip=209.132.180.131; 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Linux x86_64;\n\trv:31.0) Gecko/20100101 Thunderbird/31.8.0","MIME-Version":"1.0","To":"Joseph Myers , libc-alpha@sourceware.org","CC":"nd@arm.com","Subject":"Re: Prefer new libm function wrappers for !LIBM_SVID_COMPAT\n\t[committed]","References":"","In-Reply-To":"","Content-Type":"text/plain; charset=windows-1252","Content-Transfer-Encoding":"7bit","X-ClientProxiedBy":"DB6PR05CA0031.eurprd05.prod.outlook.com\n\t(2603:10a6:6:14::44) To HE1PR0802MB2491.eurprd08.prod.outlook.com\n\t(2603:10a6:3:d9::23)","X-MS-PublicTrafficType":"Email","X-MS-Office365-Filtering-Correlation-Id":"beacbd07-8bcf-435f-ba77-08d50761cea8","X-MS-Office365-Filtering-HT":"Tenant","X-Microsoft-Antispam":"UriScan:; BCL:0; PCL:0;\n\tRULEID:(22001)(2017030254152)(48565401081)(2017052603199)(201703131423075)(201703031133081)(201702281549075);\n\tSRVR:HE1PR0802MB2491; ","X-Microsoft-Exchange-Diagnostics":["1; HE1PR0802MB2491;\n\t3:M6HXTcYfBZcEWvkhBtdzfft0oopcbLW0AVSShhX7c+N1aWJw0eR/rTlPofNIsPwQImKdvdkXcqgtoYM8wXFw5IG0b0++q0SbCrC2OjlNZj8XLHtgIzKuhjzmT9TODNc4bnmHzcb39TeJTcazejGrmfLqGnc11cy+kok0/WoYhPsypdbfcb5vS6Tk9kfqrpVv8m4bjygNBZeKUQR70zwd0BSY53h5fmOt9v5XUjeyM7V4cUOmfHJhS96jQH4tlDAb;\n\t25:ICORS+vLkr9ZZD6C0tglO7dZji4EqqN8M3o4mgZnAS6EsaBPW2Uq3crvk6aSKpBhDHg8fWbjo777wlRZhadzSHUjPJPGzvdLqm88gbCE5Efmt1cjvrrzZSurrtKqco+UiIbTgmjyPZ3ARvu48g1+UNnqVsdzyXezOoBk+v0O8tXQfVcEifwz3ih9I6jpxTFnRVOlr+LbWACJ/f+XOEJHIAVj3n1cm63eCStoORNZp04no35XBdMhvXwiAh1uYfO2XVQEsPLhWHZ3J3i464S59AroucoBHwG4csObvnxC3md6B//GxiVIji7HPbDeN+/RJ79GBjC5gIXe8oV42br4lQ==;\n\t31:KWx3UK3oSVvHESYbWrmu1ntwuWEU1fHxR5WFwwWU13Ug8WhGcy3P52lZnEQh2iLT3kQTnpBWK+B2eu0ShWpKfDR3wpcmzse3u++6MZwRxKzD8nzIAHGQQSFl3UL1B7y6gba320zA18EciNb1luxBVClb70Dn6dFjNKsXoHYKdxnphT+egXpy5Aucc5vZNyWh0P/98yJ0FDupHS/ZjF2em093I8bF7IZDSJNYHC6OQpg=","1; 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SFP:1101; SCL:1; SRVR:HE1PR0802MB2491;\n\tH:[10.2.206.69]; FPR:; SPF:None; PTR:InfoNoRecords; MX:1; A:1;\n\tLANG:en; ","Received-SPF":"None (protection.outlook.com: arm.com does not designate\n\tpermitted sender hosts)","SpamDiagnosticOutput":"1:99","SpamDiagnosticMetadata":"NSPM","X-OriginatorOrg":"arm.com","X-MS-Exchange-CrossTenant-OriginalArrivalTime":"29 Sep 2017 17:44:59.8648\n\t(UTC)","X-MS-Exchange-CrossTenant-FromEntityHeader":"Hosted","X-MS-Exchange-CrossTenant-Id":"f34e5979-57d9-4aaa-ad4d-b122a662184d","X-MS-Exchange-Transport-CrossTenantHeadersStamped":"HE1PR0802MB2491"}},{"id":1777698,"web_url":"http://patchwork.ozlabs.org/comment/1777698/","msgid":"","list_archive_url":null,"date":"2017-09-29T17:56:35","subject":"Re: Prefer new libm function wrappers for !LIBM_SVID_COMPAT\n\t[committed]","submitter":{"id":4349,"url":"http://patchwork.ozlabs.org/api/people/4349/","name":"Joseph Myers","email":"joseph@codesourcery.com"},"content":"On Fri, 29 Sep 2017, Szabolcs Nagy wrote:\n\n> i think this change made the gammaf, gamma, gammal\n> weak aliases disappear on new targets.\n\nAnd it seems for static linking.\n\n> (at least i don't have those symbols after i rebase\n> the arm/ilp32 patches now, they used to come from\n> math/w_lgamma*_compat2.os)\n> \n> i don't think it's safe to remove them for new targets\n> since they are still in the public math.h\n\nI think that means new targets and static linking should get them from \nw_lgamma_template.c. That is, there should be w_lgamma.c, w_lgammaf.c and \nw_lgammal.c that include the template in the usual way then (for \n!LIBM_SVID_COMPAT) create the additional aliases (since we don't want the \nold versions of wrappers used on new targets - and as gamma is a Unix98 \ninterface, it should stay around, but as it's obsolescent, we don't want \nit for any _FloatN / _FloatNx types).","headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":["patchwork-incoming@bilbo.ozlabs.org","mailing list libc-alpha@sourceware.org"],"Authentication-Results":["ozlabs.org;\n\tspf=pass (mailfrom) smtp.mailfrom=sourceware.org\n\t(client-ip=209.132.180.131; helo=sourceware.org;\n\tenvelope-from=libc-alpha-return-85129-incoming=patchwork.ozlabs.org@sourceware.org;\n\treceiver=)","ozlabs.org; dkim=pass (1024-bit key;\n\tsecure) header.d=sourceware.org header.i=@sourceware.org\n\theader.b=\"Xih0aaJ8\"; dkim-atps=neutral","sourceware.org; auth=none"],"Received":["from sourceware.org (server1.sourceware.org [209.132.180.131])\n\t(using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256\n\tbits)) (No client certificate requested)\n\tby ozlabs.org (Postfix) with ESMTPS id 3y3fQC42NTz9sRW\n\tfor ;\n\tSat, 30 Sep 2017 03:56:51 +1000 (AEST)","(qmail 99057 invoked by alias); 29 Sep 2017 17:56:45 -0000","(qmail 99048 invoked by uid 89); 29 Sep 2017 17:56:45 -0000"],"DomainKey-Signature":"a=rsa-sha1; c=nofws; d=sourceware.org; h=list-id\n\t:list-unsubscribe:list-subscribe:list-archive:list-post\n\t:list-help:sender:date:from:to:cc:subject:in-reply-to:message-id\n\t:references:mime-version:content-type; q=dns; s=default; b=l5/bf\n\trJtDbA1joGw8UqQt5w49jbo3dPldzOfGUGjlpOfUlEBNP73xoexKGMsg2WBmWAfF\n\tb3jYzZG6Kdu9/WbtCcB4L4jmZouelsh+4TrI5nWITNqFu7dOhxdCHN7lUrlDOi7l\n\t5xoMei1dcboCqHw07QQYRVvZewMXpIC+J2nk1E=","DKIM-Signature":"v=1; a=rsa-sha1; c=relaxed; d=sourceware.org; h=list-id\n\t:list-unsubscribe:list-subscribe:list-archive:list-post\n\t:list-help:sender:date:from:to:cc:subject:in-reply-to:message-id\n\t:references:mime-version:content-type; s=default; bh=1x64PQGC/5d\n\tEXf6ircetEnSBKSY=; b=Xih0aaJ8bGDbb+zu1Ri0X5+X384vaVnsVRj0MsRurtx\n\tlCtXATzzM0innJ+LJTMU3AX+0Ia5tV5n+GfKaHfi2HchL5zm7teDSXZ8smBjcEf6\n\tWCGSDpOkmm9G0TUZoGeFpiE+Sj3h/57jutXyQYM6N0PaCYAKnjhYkl+aSDrgsnkw\n\t=","Mailing-List":"contact libc-alpha-help@sourceware.org; run by ezmlm","Precedence":"bulk","List-Id":"","List-Unsubscribe":"","List-Subscribe":"","List-Archive":"","List-Post":"","List-Help":",\n\t","Sender":"libc-alpha-owner@sourceware.org","X-Virus-Found":"No","X-Spam-SWARE-Status":"No, score=-2.0 required=5.0 tests=AWL, BAYES_00,\n\tRCVD_IN_DNSWL_NONE, SPF_PASS,\n\tURIBL_RED autolearn=ham version=3.3.2 spammy=(unknown)","X-HELO":"relay1.mentorg.com","Date":"Fri, 29 Sep 2017 17:56:35 +0000","From":"Joseph Myers ","To":"Szabolcs Nagy ","CC":", ","Subject":"Re: Prefer new libm function wrappers for !LIBM_SVID_COMPAT\n\t[committed]","In-Reply-To":"<59CE8698.4000902@arm.com>","Message-ID":"","References":"\n\t<59CE8698.4000902@arm.com>","User-Agent":"Alpine 2.20 (DEB 67 2015-01-07)","MIME-Version":"1.0","Content-Type":"text/plain; charset=\"US-ASCII\"","X-ClientProxiedBy":"svr-ies-mbx-01.mgc.mentorg.com (139.181.222.1) To\n\tsvr-ies-mbx-01.mgc.mentorg.com (139.181.222.1)"}}]