From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [216.205.24.124]) by sourceware.org (Postfix) with ESMTP id 03B5E3890413 for ; Fri, 29 Jan 2021 16:32:58 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.3.2 sourceware.org 03B5E3890413 Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-291-w4ymzEAOPMiBJvkNZjFDKQ-1; Fri, 29 Jan 2021 11:32:52 -0500 X-MC-Unique: w4ymzEAOPMiBJvkNZjFDKQ-1 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id B73D159; Fri, 29 Jan 2021 16:32:50 +0000 (UTC) Received: from oldenburg.str.redhat.com (ovpn-113-35.ams2.redhat.com [10.36.113.35]) by smtp.corp.redhat.com (Postfix) with ESMTPS id DCFCF5C1B4; Fri, 29 Jan 2021 16:32:49 +0000 (UTC) From: Florian Weimer To: libc-alpha@sourceware.org Subject: [PATCH] NEWS: Add entry for glibc-hwcaps and deprecate legacy hwcaps Date: Fri, 29 Jan 2021 17:32:47 +0100 Message-ID: <87pn1nwvo0.fsf@oldenburg.str.redhat.com> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/27.1 (gnu/linux) MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain X-Spam-Status: No, score=-12.6 required=5.0 tests=BAYES_00, DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, GIT_PATCH_0, RCVD_IN_DNSWL_LOW, RCVD_IN_MSPIKE_H3, RCVD_IN_MSPIKE_WL, SPF_HELO_NONE, SPF_PASS, TXREP autolearn=ham autolearn_force=no version=3.4.2 X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 29 Jan 2021 16:33:00 -0000 --- NEWS | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) diff --git a/NEWS b/NEWS index d121f7df87..6521a4f5b7 100644 --- a/NEWS +++ b/NEWS @@ -16,6 +16,19 @@ Major new features: * The dynamic linker accepts the --argv0 argument and provides opportunity to change argv[0] string. +* The dynamic linker loads optimized implementations of shared objects + from subdirectories under the glibc-hwcaps directory on the library + search path if the system's capabilities meet the requirements for + that subdirectory. Initially supported subdirectories include + "power9" and "power10" for the powerpc64le-linux-gnu architecture, + "z13", "z14", "z15" for s390x-linux-gnu, and "x86-64-v2", "x86-64-v3", + "x86-64-v4" for x86_64-linux-gnu. In the x86_64-linux-gnu case, the + subsdirectory names correspond to the vendor-independent x86-64 + microarchitecture levels defined in the x86-64 psABI supplement. + +* The new --help option of the dynamic linker provides usage and + information and library search path diagnostics. + * The mallinfo2 function is added to report statistics as per mallinfo, but with larger field widths to accurately report values that are larger than fit in an integer. @@ -63,6 +76,14 @@ Deprecated and removed features, and other changes affecting compatibility: libraries that use this type in their interfaces. The new definition improves consistency with compiler behavior in many scenarios. +* A future version of glibc will stop loading shared objects from the + "tls" subdirectories on the library search path, the subdirectory that + corresponds to the AT_PLATFORM system name, and also stop employing + the legacy AT_HWCAP search mechanism. Applications should switch to + the new glibc-hwcaps mechanism instead; if they do not do that, only + the baseline version (directly from the search path directory) will be + loaded. + Changes to build and runtime requirements: * On Linux, the system administrator needs to configure /dev/pts with -- Red Hat GmbH, https://de.redhat.com/ , Registered seat: Grasbrunn, Commercial register: Amtsgericht Muenchen, HRB 153243, Managing Directors: Charles Cachera, Brian Klemm, Laurie Krebs, Michael O'Neill