ci: update ubuntu:20.04 builders to 22.04

[cuviper]

This is mostly just maintenance to avoid bitrotting, but 22.04 also updates to cmake 3.22, so they don't need the manual builds from #113714 anymore.

[rustbot]

r? @Mark-Simulacrum

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[Mark-Simulacrum]

@bors r+ rollup=never

Nothing here looks too suspicious...

[bors]

📌 Commit 3cd3a91 has been approved by Mark-Simulacrum

It is now in the queue for this repository.

[bors]

⌛ Testing commit 3cd3a91 with merge b6dd153...

[Kobzol]

I think that the bump from 20.04 to 22.04 updates the glibc version. Do we care about this for some of the modified dist builders? Or is this only relevant for x64 Linux gnu?

[cuviper]

Hmm, I suppose it is relevant to any *-linux-gnu that uses the Ubuntu cross compilers, but it doesn't matter as much for those that don't provide host tools. So dist-powerpc64le-linux is a host but not using the Ubuntu toolchain; dist-various-1 and -2 have a few linux-gnu that are non-host, using Ubuntu's toolchain.

Do we care about libstd.so glibc versions on those? (libstd.rlib should be fine.)

[cuviper]

If we do care, maybe we could fork those linux-gnu targets into a dist-various-3 or something, that explicitly holds back on ubuntu:20.04. Long term, it would be better to use crosstool-ng toolchains when we want to control glibc versions.

[Mark-Simulacrum]

Can you check against https://doc.rust-lang.org/beta/rustc/platform-support.html? I think if we don't document a version we should be fine to bump as a nonevent, otherwise let's bump the documentation at least. (My quick scroll suggests it's not unlikely this doesn't change anything, but I'm not sure)

[matthiaskrgr]

Hmm, dist-x86_64-musl is running for 2.5 hours already, hopefully that is just a one-off 😓

[bors]

☀️ Test successful - checks-actions
Approved by: Mark-Simulacrum
Pushing b6dd153 to master...

[cuviper]

Can you check against https://doc.rust-lang.org/beta/rustc/platform-support.html? I think if we don't document a version we should be fine to bump as a nonevent, otherwise let's bump the documentation at least.

The glibc versions under Tier 2 (without host) should be updated, but they're already wrong. They should have been updated for #81521 at least, and there's a deja vu comment about compat and dynamic linking... 😅

I'll send an update, including a footnote about that applicability.

[cuviper]

Hmm, dist-x86_64-musl is running for 2.5 hours already, hopefully that is just a one-off 😓

LLVM alone took over 1.5 hours in that build, but only 5 minutes in the next -- hooray for sccache!

[rust-timer]

Finished benchmarking commit (b6dd153): comparison URL.

Overall result: ✅ improvements - no action needed

@rustbot label: -perf-regression

Instruction count

This is a highly reliable metric that was used to determine the overall result at the top of this comment.

	mean	range	count
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	-	-	0
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-0.6%	[-0.8%, -0.3%]	3
All ❌✅ (primary)	-	-	0

Max RSS (memory usage)

This benchmark run did not return any relevant results for this metric.

Cycles

Results

This is a less reliable metric that may be of interest but was not used to determine the overall result at the top of this comment.

	mean	range	count
Regressions ❌ (primary)	3.3%	[1.0%, 6.3%]	8
Regressions ❌ (secondary)	2.1%	[2.1%, 2.1%]	1
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	3.3%	[1.0%, 6.3%]	8

Binary size

This benchmark run did not return any relevant results for this metric.

Bootstrap: 650.027s -> 649.861s (-0.03%)