FreeBSD Errata Notice FreeBSD-EN-21:18.libc++
30 June, 2021 by email@example.com | freebsd
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 ============================================================================= FreeBSD-EN-21:18.libc++ Errata Notice The FreeBSD Project Topic: Missing C++20 headers in libc++ Category: contrib Module: libc++ Announced: 2021-06-29 Affects: FreeBSD 13.0 Corrected: 2021-06-03 18:53:18 UTC (stable/13, 13.0-STABLE) 2021-06-29 17:08:58 UTC (releng/13.0, 13.0-RELEASE-p3) For general information regarding FreeBSD Errata Notices and Security Advisories, including descriptions of the fields above, security branches, and the following sections, please visit <URL:https://security.FreeBSD.org/>. I. Background libc++ is an implementation of the C++ Standard Library, provided by the LLVM project. It is used by C++ programs in the base system, and also by many C++ programs in the ports collection. II. Problem Description The LLVM project components in the base system, including libc++, were (2020-07-31) upgraded to upstream version 11.0.0. Among other features, improvements were made to libc++ to better support the C++20 standard. This also included a number of new Standard Library headers, but these were missed during the upgrade and not installed into the base system, in particular: * <barrier> * <concepts> * <execution> * <latch> * <numbers> * <semaphore> III. Impact Even though clang and libc++ 11.0.0 have much improved support for the C++20 standard, it is not possible to build programs using the standard headers listed above, because they are not available in the base system. IV. Workaround No workaround is available. V. Solution Upgrade your system to a supported FreeBSD stable or release / security branch (releng) dated after the correction date. Perform one of the following: 1) To update your system via a binary patch: Systems running a RELEASE version of FreeBSD on the amd64, i386, or (on FreeBSD 13 and later) arm64 platforms can be updated via the freebsd-update(8) utility: # freebsd-update fetch # freebsd-update install 2) To update your system via a source code patch: The following patches have been verified to apply to the applicable FreeBSD release branches. a) Download the relevant patch from the location below, and verify the detached PGP signature using your PGP utility. # fetch https://security.FreeBSD.org/patches/EN-21:18/libc++.patch # fetch https://security.FreeBSD.org/patches/EN-21:18/libc++.patch.asc # gpg --verify libc++.patch.asc b) Apply the patch. Execute the following commands as root: # cd /usr/src # patch < /path/to/patch c) Recompile the operating system using buildworld and installworld as described in <URL:https://www.FreeBSD.org/handbook/makeworld.html>. VI. Correction details This issue is corrected by the corresponding Git commit hash or Subversion revision number in the following stable and release branches: Branch/path Hash Revision - ------------------------------------------------------------------------- stable/13/ 70e13c4cffd5 stable/13-n245875 releng/13.0/ dac086497e50 releng/13.0-n244747 - ------------------------------------------------------------------------- Run the following command to see which files were modified by a particular commit: # git show --stat <commit hash> Or visit the following URL, replacing NNNNNN with the hash: <URL:https://cgit.freebsd.org/src/commit/?id=NNNNNN> To determine the commit count in a working tree (for comparison against nNNNNNN in the table above), run: # git rev-list --count --first-parent HEAD VII. References <URL:https://en.cppreference.com/w/cpp/header/barrier> <URL:https://en.cppreference.com/w/cpp/header/concepts> <URL:https://en.cppreference.com/w/cpp/header/execution> <URL:https://en.cppreference.com/w/cpp/header/latch> <URL:https://en.cppreference.com/w/cpp/header/numbers> <URL:https://en.cppreference.com/w/cpp/header/semaphore> <URL:https://bugs.freebsd.org/bugzilla/show_bug.cgi?id%5374> The latest revision of this advisory is available at <URL:https://security.FreeBSD.org/advisories/FreeBSD-EN-21:18.libc++.asc> -----BEGIN PGP SIGNATURE----- iQIzBAEBCgAdFiEE/A6HiuWv54gCjWNV05eS9J6n5cIFAmDcD0QACgkQ05eS9J6n 5cKVZg//Ro5nAZ7q23Uf4LlZchlADS8BlH6rHxJ2sk2784CJl4q0Lrh1UMcttfg6 JA8xfbNV2YXLIzUaXemCfzJAOwCfuNSZkU4hJ568eqo5/itpRf5uQ6hXIwlmmYKw 9Sk8ciUAxO4HuxLxKRDEPsHWSSQE04SnGyQk82AXCpxn/0nTeQoeKj1wyPHBf8F+ Kj0kl30l9JKpnoXgHfvyTvK2akJAXbH1v+pc72kyjVBhy8HWKAtsbyC7vYbELylB XuH2IwxAVf1iR3VG7slUlr/L/XcGniICRzmYoY1A/SW6QalEfLDPtZLujl33HMOE xyni4+oi7JsbgwVc/ISNfqwtyZePSD8RCczLNrZb+femGz/iyGwq1fPn8w0H5snp NYrQ22HnjIR5E6Tqlx4IdVFC0M9JQjmEp9cTjG+9CM6L0qZLStdzYbGlJsG2qz0o hBc3gvMGZzP2uBG8VxaIH3FBZGgMllsN0/uaOvqipZyqA8t4OR56bF5/AEGxLuJY MPdMBMKNDvIpLKe9CEJ9A6BpAO3aPWnRKgAGKlV69t1wub0GWeAAFHz70JQC0Kgv 6q5xuCjzzGydIeZdv34uSkVThB+vv4OgpdH806ZZLjSr90kfzYJsRYDTNxRBdKpR etU1E7FFJAxl9Qc2gXadEvDhi4IhKslBdtlQFIZvkoO8Wd4VhHM=vLEs -----END PGP SIGNATURE----- _______________________________________________ firstname.lastname@example.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-announce To unsubscribe, send any mail to "email@example.com"