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== Documentation ==
== Documentation ==
Revision as of 01:07, 6 December 2018
Boost 1.69 upgrade
This change brings Boost 1.69 to Fedora. This will mean Fedora ships with a recent upstream Boost release.
- Name: Jonathan Wakely
- Email: jwakely at fedoraproject dot org
- Release notes owner:
- Targeted release: Fedora 30
- Last updated: 2018-12-06
- Tracker bug: <will be assigned by the Wrangler>
- Boost releases on GitHub
- Boost on Pagure (Fedora Git repository)
The aim is to synchronize Fedora with the most recent Boost release. Because ABI stability is one of explicit Boost non-goals, this entails rebuilding of all dependent packages. This has also always entailed yours truly assisting maintainers of client packages in decoding cryptic boost-ese seen in output from g++. Such care is to be expected this time around as well.
Benefit to Fedora
Fedora 29 includes Boost 1.67 but the latest upstream release, Boost 1.68, was released on August 9th, 2018 (the 1.69 release is scheduled for mid-November 2018, so it should be in time for F30).
Fedora will stay relevant, as far as Boost clients are concerned. Boost 1.68 brings two new libraries:
- YAP, an expression template library for C++14 and later, from Zach Laine.
- Proposal owners:
- Build will be done with Boost.Build v2 (which is the upstream-sanctioned way of building Boost)
- Request a "f30-boost" build system tag (discussion): https://pagure.io/releng/issue/7614
- Build boost into that tag (take a look at the build #606493 for inspiration)
- Post a request for rebuilds to fedora-devel
- Work on rebuilding dependent packages in the tag.
- When most is done, re-tag all the packages to rawhide
- Watch fedora-devel and assist in rebuilding broken Boost clients (by fixing the client, or Boost).
- Other developers:
- Those who depend on Boost DSOs will have to rebuild their packages. Feature owners will alleviate some of this work as indicated above, and will assist those whose packages fail to build in debugging them.
- Release engineering:  (a check of an impact with Release Engineering is needed)
- List of deliverables: All deliverables will include updated Boost packages.
- Policies and guidelines:
- Apart from scope, this is business as usual, so no policies, no guidelines.
- Trademark approval: N/A (not needed for this Change)
- No impact on system upgrade.
- No manual configuration or data migration needed.
- Some impact on other packages. Historically this hasn't been too big of a problem and could always be resolved before deadline.
How To Test
- No special hardware is needed.
- Integration testing simply consists of installing Boost packages (
dnf install boost) on Fedora and checking that it does not break other packages (see below for a way to obtain a list of boost clients).
- Expected to remain largely the same.
- Developers building third-party software on Fedora may need to rebuild against the new Boost packages, and may need to adjust their code if the new Boost release is not source-compatible.
Packages that must be rebuilt:
$ repoquery -s --releasever=rawhide --whatrequires libboost\* --disablerepo=* --enablerepo=fedora | sort -u
$ repoquery --releasever=rawhide --archlist=src --whatrequires boost-devel --disablerepo='*' --enablerepo=fedora-source
- Contingency mechanism: Worst case scenario is to abandon the update and simply ship F30 with Boost 1.67, which is already in rawhide.
- Contingency deadline: We will know whether the change can be made once the rebuilds in the side tag are done, which will be January 2019, ideally before the mass rebuild.
- Blocks release? No
- Blocks product? None
- https://www.boost.org/users/history/version_1_69_0.html (should be released on the 12 December 2018)
- https://www.boost.org/users/history/version_1_68_0.html (released on the 9 August 2018)
(Incomplete) Boost has been upgraded to version 1.69. Apart from a number of bug fixes and improvements to existing libraries, this brings a new library compared to Fedora 29: Boost.YAP.