ci: Build gccjit from a git archive

[cuviper]

A full git clone of GCC includes quite a lot of history, and it's
completely unnecessary for building it in CI. We can use a GitHub
archive URL to get a simple tarball that is much faster to download.

Also, the gcc-build directory can be removed after install to reduce
the image size even further.

[rustbot]

r? @Mark-Simulacrum

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[cuviper]

If for some reason we do want git metadata on disk, AFAIK shallow clones are not possible with specific commit hashes, but you can get there with git init; git fetch --depth 1 $repo $commit; git checkout $commit.

[Urgau]

We should probably also retry the download if it fails for some reason.

Suggested change

	curl -L "$GIT_REPO/archive/$GIT_COMMIT.tar.gz" |
	retry curl -L "$GIT_REPO/archive/$GIT_COMMIT.tar.gz" |

[cuviper]

I think it's not that simple -- if a partial download fails and restarts, the latter | tar is not likely to fare well. We could download to disk first, or wrap the pipeline in a bash function to be retried. But I wonder if this is useful, because if a GitHub CI runner can't download from github.com, we likely have bigger issues...

[Urgau]

The issue here is not so much the download but the transient DNS failures, they happened in the past, even for github.com (can't find a example right now).

Sure, we may want to download first to disk; I didn't look to closely at the retry function.

[Mark-Simulacrum]

I wouldn't worry about it. The whole docker build is already retried 5 times IIRC. This is maybe nice cleanup in the future but isn't worth it for now.

[Mark-Simulacrum]

@bors r+ rollup

[bors]

📌 Commit f512f9e has been approved by Mark-Simulacrum

It is now in the queue for this repository.

[Mark-Simulacrum]

@bors rollup=iffy (actually)

[bors]

⌛ Testing commit f512f9e with merge 7af7db4...

[bors]

💥 Test timed out

[rust-log-analyzer]

A job failed! Check out the build log: (web) (plain)

Click to see the possible cause of the failure (guessed by this bot)

[Mark-Simulacrum]

@bors retry apple-aarch64 timed out

[bors]

⌛ Testing commit f512f9e with merge 0824b30...

[bors]

☀️ Test successful - checks-actions
Approved by: Mark-Simulacrum
Pushing 0824b30 to master...

[rust-timer]

Finished benchmarking commit (0824b30): 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)	-3.2%	[-3.2%, -3.2%]	1
All ❌✅ (primary)	-	-	0

Max RSS (memory usage)

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)	2.0%	[1.5%, 2.3%]	3
Regressions ❌ (secondary)	-	-	0
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-4.5%	[-5.9%, -1.7%]	3
All ❌✅ (primary)	2.0%	[1.5%, 2.3%]	3

Cycles

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

Binary size

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

Bootstrap: 670.98s -> 670.209s (-0.11%)
Artifact size: 315.04 MiB -> 315.07 MiB (0.01%)

[rust-log-analyzer]

A job failed! Check out the build log: (web) (plain)

Click to see the possible cause of the failure (guessed by this bot)

##[endgroup]
Secret source: Actions
Prepare workflow directory
Prepare all required actions
Complete job name: skip if S-waiting-on-bors
##[group]Run # Fetch state and labels of PR
# Fetch state and labels of PR
# Or exit successfully if PR does not exist
JSON=$(gh pr view cargo_update --repo $GITHUB_REPOSITORY --json labels,state || exit 0)
STATE=$(echo "$JSON" | jq -r '.state')
WAITING_ON_BORS=$(echo "$JSON" | jq '.labels[] | any(.name == "S-waiting-on-bors"; .)')

# Exit with error if open and S-waiting-on-bors
if [[ "$STATE" == "OPEN" && "$WAITING_ON_BORS" == "true" ]]; then
  gh run cancel 8413221908
shell: /usr/bin/bash --noprofile --norc -e -o pipefail {0}