List of oldest supported version of top 10 Linux Distros and their glibc version according to distrowatch.com.
Out of all versions with published EOLs, 2.12 is the oldest glibc still active, found in CentOS 6.8.
If CentOS 6 and 7 are eliminated, the oldest glibc is 2.23 in Ubuntu and Slackware.
Mint - 18.3 sylvia
- EOL: 2021-04
- glibc: 2.27
- EOL: 2023-04
- glibc: 2.27
- EOL: 2021-04
- glibc: 2.23
MX Linux - 17.1
- EOL: None (Based on Debian 9 which has no EOL yet)
- glibc: 2.24
- Notes: MX-16 is based on Debian 8 which is EOL 2020-05
Arch Linux - 2020.01.22
- EOL: Rolling release
- glibc: 2.30
Gentoo - 2020-01-22
- EOL: Rolling release
- glibc: 2.29
Slackware - 14.2
- EOL: None
- glibc: 2.23
- NOTE: No EOLs are published. 14.2 was released in 2016. Older versions have libc < 2.17.
Debian - 9 stretch
- EOL: None announced
- glibc: 2.24
Fedora - 30
- EOL: None announced
- glibc: 2.29
OpenSUSE - 15.1
- EOL: None announced
- glibc: 2.26
- EOL: 2020-11
- glibc: 2.12
- EOL: 2024-06
- glibc: 2.17
- EOL: None announced
- glibc: 2.28
FreeBSD - 10.3
- EOL: 2018-04
- glibc: N/A
I pulled this info from Distrowatch and that is still going to be the best place to get up to date data. However, they don't provide a good way to look at all this info at once which is why I made this.
I don't really have the time (or current need) to keep this list consistently up to date. It's too bad that there's no way to target PRs at gists. It could make sense to make a single-file repo for this very reason. If someone does that, I can add a link at the top of this gist.