The GNU C Library version 2.30
Switch glibc in Fedora 31 to glibc version 2.30.
- Name: Florian Weimer
- Email: email@example.com
- Release notes owner:
- Release notes ticket:
- Targeted release: Fedora 31
- Last updated: 2019-07-03
- Tracker bug: #1726770
- Release Notes Tracker: #355
The GNU C Library version 2.30 will be released at the beginning of August 2019; we have started closely tracking the glibc 2.30 development code in Fedora Rawhide and are addressing any issues as they arise. Given the present schedule Fedora 31 will branch after the GLIBC 2.30 upstream release. However, the mass rebuild schedule means Fedora 31 will mass rebuild (if required) after GLIBC 2.30 upstream freezes ABI for release, but before the actual release, so careful attention must be paid to any last minute ABI changes.
Benefit to Fedora
Stays up to date with latest security and bug fixes from glibc upstream.
- Proposal owners: Update glibc to 2.30.
- Other developers: Developers need to ensure that rawhide is stable and ready for the Fedora 31 branch. Given that glibc is backwards compatible and we have been testing the new glibc in rawhide it should make very little impact when updated, except for the occasional deprecation warnings and removal of legacy interfaces from public header files.
- Release engineering: #8462
- List of deliverables: ???
- Policies and guidelines: The policies and guidelines do not need to be updated.
- Trademark approval: Not needed for this change
The library is backwards compatible with the version of glibc that was shipped in Fedora 29.
Some packaging changes required, see: https://sourceware.org/glibc/wiki/Release/2.30#Packaging_Changes
We fully expect to fix all packaging changes in Fedora Rawhide given that glibc in Rawhide is tracking what will become glibc 2.30.
How To Test
The GNU C Library has its own testsuite, which is run during the package build and examined by the glibc developers before being uploaded. This test suite has 5900+ tests that run to verify the correct operation of the library. In the future we'll also be running the microbenchmark to look for performance regressions as well as behavioural ones.
Users will see improved performance, many bugfixes and improvements to POSIX compliance, additional locales, etc. The glibc 2.30 NEWS update will include more details.
All packages do not need to be rebuilt.
- Contingency mechanism: Given that Rawhide has started tracking glibc 2.30, no show-stopper problems are expected. At this point, we can still revert to upstream version 2.29 if insurmountable problems appear, but to do so may require a mass rebuild to remove new symbols from the ABI/API.
- Contingency deadline: Upstream ABI freeze deadline of 2019-07-01.
- Blocks release? Upgrading glibc does block the release. We should not ship without a newer glibc, there will be gcc and language features that depend on glibc being upgraded. Thus without the upgrade some features will be disabled or fall back to less optimal implementations.
The glibc manual contains the documentation for the release and doesn't need any more additional work.
- Release Notes tracking: <will be assigned by the Wrangler>
The GNU C Library version 2.30 will be released at the beginning of August 2019. The current NEWS notes can be seen here as they are added: https://sourceware.org/git/?p=glibc.git;a=blob;f=NEWS;hb=HEAD