Enable check-cfg in stage0

[Urgau]

Now that the bootstrap cargo supports rustc-check-cfg we can now enable it with -Zcheck-cfg=output and use it in rustc_llvm to unblock --check-cfg support in stage0.

r? @Mark-Simulacrum

[Mark-Simulacrum]

@bors r+ rollup=iffy

[bors]

📌 Commit f818872 has been approved by Mark-Simulacrum

It is now in the queue for this repository.

[bors]

⌛ Testing commit f818872 with merge a295195c6f5f6ef10f31145839abbc1f5b360c9c...

[bors]

💔 Test failed - checks-actions

[rust-log-analyzer]

The job x86_64-gnu-aux failed! Check out the build log: (web) (plain)

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

1   1         Updating [..]
2   2      Downloading crates ...
3   3       Downloaded common v1.0.0 [..]
4   4        Compiling common v1.0.0
5   5          Running `rustc --crate-name common [..]
6        -     Running `rustc --crate-name common [..]
7   6        Compiling pm v0.1.0 [..]
    7    +     Running `rustc --crate-name common /checkout/obj/build/x86_64-unknown-linux-gnu/stage2-tools/x86_64-unknown-linux-gnu/tmp/cit/t767/home/.cargo/registry/src/-4dba4148552fc90b/common-1.0.0/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --crate-type lib --emit=dep-info,metadata,link -C opt-level=2 -C embed-bitcode=no -C debuginfo=2 -C debug-assertions=on -C metadata=3727013b635cbf1c -C extra-filename=-3727013b635cbf1c --out-dir /checkout/obj/build/x86_64-unknown-linux-gnu/stage2-tools/x86_64-unknown-linux-gnu/tmp/cit/t767/foo/target/debug/deps -L dependency=/checkout/obj/build/x86_64-unknown-linux-gnu/stage2-tools/x86_64-unknown-linux-gnu/tmp/cit/t767/foo/target/debug/deps --cap-lints allow`
8   8          Running `rustc --crate-name pm [..]
9   9        Compiling foo v0.1.0 [..]
10  10         Running `rustc --crate-name foo [..]
11  11        Finished [..]

other output:

', src/tools/cargo/tests/testsuite/collisions.rs:372:10
---
test result: FAILED. 2586 passed; 1 failed; 7 ignored; 0 measured; 0 filtered out; finished in 113.71s

error: test failed, to rerun pass '--test testsuite'
Build completed unsuccessfully in 0:31:53
make: *** [check-aux] Error 1
Makefile:44: recipe for target 'check-aux' failed

[Mark-Simulacrum]

@bors retry

[bors]

⌛ Testing commit f818872 with merge 03d488b...

[bors]

☀️ Test successful - checks-actions
Approved by: Mark-Simulacrum
Pushing 03d488b to master...

[rust-timer]

Finished benchmarking commit (03d488b): comparison url.

Instruction count

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

Max RSS (memory usage)

Results

• Primary benchmarks: no relevant changes found
• Secondary benchmarks: mixed results

	mean1	max	count2
Regressions 😿 (primary)	N/A	N/A	0
Regressions 😿 (secondary)	6.1%	8.9%	3
Improvements 🎉 (primary)	N/A	N/A	0
Improvements 🎉 (secondary)	-3.0%	-3.4%	2
All 😿🎉 (primary)	N/A	N/A	0

Cycles

Results

• Primary benchmarks: mixed results
• Secondary benchmarks: no relevant changes found

	mean1	max	count2
Regressions 😿 (primary)	2.3%	2.3%	1
Regressions 😿 (secondary)	N/A	N/A	0
Improvements 🎉 (primary)	-2.5%	-2.5%	1
Improvements 🎉 (secondary)	N/A	N/A	0
All 😿🎉 (primary)	-0.1%	-2.5%	2

If you disagree with this performance assessment, please file an issue in rust-lang/rustc-perf.

@rustbot label: -perf-regression

Footnotes

1. the arithmetic mean of the percent change ↩ ↩²

2. number of relevant changes ↩ ↩²