Fix rustc_codegen_gcc build and tests failure in CI

[Urgau]

#118463 seems to have broke the PR CI, more specificaly the x86_64-gnu-llvm-16 builder which fail with:

Building stage1 codegen backend gcc (x86_64-unknown-linux-gnu)
     Compiling libc v0.2.147
     Compiling rustix v0.38.8
     Compiling memchr v2.5.0
     Compiling bitflags v2.4.0
     Compiling linux-raw-sys v0.4.5
     Compiling fastrand v2.0.0
     Compiling smallvec v1.10.0
error: invalid `--check-cfg` argument: `values(freebsd10)` (expected `cfg(name, values("value1", "value2", ... "valueN"))`)
  
error: could not compile `libc` (lib) due to previous error

Updating to libc version 0.2.150 fixes the build issue since it includes the support for the new check-cfg syntax.

Then it failed with a missing #![allow(internal_features)] in one of the example.

r? @GuillaumeGomez

[rustbot]

Some changes occurred in compiler/rustc_codegen_gcc

cc @antoyo

[antoyo]

Seems like we would now need to specify -Ainternal_features for the failing test.

If it is needed for many tests, it might be simpler to just set CG_RUSTFLAGS="-Ainternal_features" globally.

[GuillaumeGomez]

Seems like it fixes the failure introduced in #118463. Thanks for that! Let's approve it to unblock the merge queue.

@bors delegate=Urgau

[bors]

✌️ @Urgau, you can now approve this pull request!

If @GuillaumeGomez told you to "r=me" after making some further change, please make that change, then do @bors r=@GuillaumeGomez

[rustbot]

Failed to set assignee to ghost: invalid assignee

Note: Only org members with at least the repository "read" role, users with write permissions, or people who have commented on the PR may be assigned.

[Urgau]

@bors r=@GuillaumeGomez p=1

[bors]

📌 Commit 0ed3b68 has been approved by GuillaumeGomez

It is now in the queue for this repository.

[bors]

⌛ Testing commit 0ed3b68 with merge f16c81f...

[bors]

☀️ Test successful - checks-actions
Approved by: GuillaumeGomez
Pushing f16c81f to master...

[rust-timer]

Finished benchmarking commit (f16c81f): 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)	1.4%	[0.9%, 2.0%]	3
Regressions ❌ (secondary)	3.6%	[3.6%, 3.6%]	1
Improvements ✅ (primary)	-2.6%	[-5.2%, -0.5%]	3
Improvements ✅ (secondary)	-2.1%	[-2.1%, -2.1%]	1
All ❌✅ (primary)	-0.6%	[-5.2%, 2.0%]	6

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: 673.714s -> 674.821s (0.16%)
Artifact size: 314.20 MiB -> 314.17 MiB (-0.01%)