Precompiled mdbook gnu executable requires newer glibc version (v0.4.23)

[jontze]

With the latest v0.4.23 release the precompiled mdbook-v0.4.23-x86_64-unknown-linux-gnu.tar.gz binary doesn't run on the github runner of ubuntu-20.04 anymore. As it fails with the following error:

mdbook --version
mdbook: /lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.33' not found (required by mdbook)

Further workflow logs her: https://github.com/jontze/action-mdbook/actions/runs/3702275493/jobs/6272375311. It still works on the latest ubuntu-22.04 runner.

I observed this behavior especially in context of the current ongoing github ubuntu-latest runner rollout: actions/runner-images#6399 . So ubuntu-latest will slowly switch from 20.04 to 22.04.

With the latest mdBook release, the build of the precompiled binaries are now executed on ubuntu-22.04.

Other projects where affected by this as well and their selected solution was to build the precompiled binaries on ubuntu-20.04 instead of ubuntu-latest.

mdBook/.github/workflows/deploy.yml

Lines 21 to 22 in eb77083

	- target: x86_64-unknown-linux-gnu
	os: ubuntu-latest

For example the nushell project had the same issue:

• glibc version too damn high? nushell/nushell#7282
• Update release script to nu v0.71 and use ubuntu-20.04 to build nu binary nushell/nushell#7290

So we might choose this way as well for the mdBook builds. However, I'm not quite sure if this is the way to go, or if there are better solutions to resolve this.

[ehuss]

Thanks for the heads up! I posted #1955 to fix it. In the mean time, I might suggest using the musl binary which is currently statically linked and shouldn't exhibit the same problem.