Limit the number of parallel link jobs during LLVM build for mingw.

[michaelwoerister]

This PR is an attempt to unblock #108355, which keeps failing while trying to link various LLVM artifacts on mingw runners. It looks like doing too many linking jobs might put too much load on the system? (Although I don't understand why the jobs are only failing for #108355 while they seem to pass for others)

r? infra-ci

[michaelwoerister]

This check is copied from

rust/src/ci/scripts/install-clang.sh

Line 40 in 0058748

elif isWindows && [[ ${CUSTOM_MINGW-0} -ne 1 ]]; then

.

[Mark-Simulacrum]

cc #108227 which is the tracking issue for this spurious failure

I don't mind trying this, but I think we should link the tracking issue for the spurious failure from the code for the future visitor who is confused. r=me with that added.

[Mark-Simulacrum]

@rustbot author

[michaelwoerister]

Thanks, @Mark-Simulacrum!

@bors r=Mark-Simulacrum

[bors]

📌 Commit 40fc423 has been approved by Mark-Simulacrum

It is now in the queue for this repository.

[michaelwoerister]

@bors p=1 since this might potentially resolve #108227, which is slowing down the whole build queue.

[bors]

⌛ Testing commit 40fc423 with merge 6502613...

[bors]

☀️ Test successful - checks-actions
Approved by: Mark-Simulacrum
Pushing 6502613 to master...

[rust-timer]

Finished benchmarking commit (6502613): comparison URL.

Overall result: no relevant changes - no action needed

@rustbot label: -perf-regression

Instruction count

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

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)	-	-	0
Regressions ❌ (secondary)	0.5%	[0.5%, 0.5%]	2
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-1.2%	[-2.4%, -0.8%]	4
All ❌✅ (primary)	-	-	0

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)	-	-	0
Regressions ❌ (secondary)	0.8%	[0.4%, 2.3%]	6
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	-	-	0