Remove libstdc++ version check error

[Kobzol]

This keeps the error message from #125411, but removes the exit(1) call.

This PR is mostly a hotfix to unblock bootstrap benchmarks in rustc-perf.

However, I think that it might be better to just print a warning, in general. If the ABI version does not match, the build might or might not work locally (as we can see on rustc-perf, where it works even if the reported ABI is 7).

If it does not work (and if we can always recognize this during the LLVM wrapper build, instead of having some silent miscompilations), then the user will have to update their libstdc++ anyway, the error does not help them out on its own. So it should be enough to just provide a better error message, without blocking the build.

But I'm not adamant on that, I just want to unblock bootstrap benchmarks until we can find a way to update libstdc++ on the collector machine.

CC @onur-ozkan

r? @Mark-Simulacrum

[Kobzol]

@bors try @rust-timer queue

[bors]

⌛ Trying commit 5349476 with merge f3d8cb4...

[onur-ozkan]

However, I think that it might be better to just print a warning, in general. If the ABI version does not match, the build might or might not work locally (as we can see on rustc-perf, where it works even if the reported ABI is 7).

Makes sense, feel free to r=me.

[Mark-Simulacrum]

I'm generally sceptical of warnings that you can't silence and that aren't actually effective (i.e., maybe the right fix here is just to accept version 7 too if we think it works well enough).

But for now we should fix the bug and iterate later, @bors r+

[bors]

📌 Commit 5349476 has been approved by Mark-Simulacrum

It is now in the queue for this repository.

[Mark-Simulacrum]

Oh, missed that you kicked off try..

@bors r-

[bors]

☀️ Try build successful - checks-actions
Build commit: f3d8cb4 (f3d8cb46438ea25e968d1cbd461e8c5cb5f3ddd5)

[rust-timer]

Finished benchmarking commit (f3d8cb4): comparison URL.

Overall result: no relevant changes - no action needed

Benchmarking this pull request likely means that it is perf-sensitive, so we're automatically marking it as not fit for rolling up. While you can manually mark this PR as fit for rollup, we strongly recommend not doing so since this PR may lead to changes in compiler perf.

@bors rollup=never
@rustbot label: -S-waiting-on-perf -perf-regression

Instruction count

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

Max RSS (memory usage)

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

Cycles

Results (primary -3.2%)

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
Improvements ✅ (primary)	-3.2%	[-3.2%, -3.2%]	1
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	-3.2%	[-3.2%, -3.2%]	1

Binary size

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

Bootstrap: missing data
Artifact size: 319.71 MiB -> 319.74 MiB (0.01%)

[Kobzol]

Good, this fixed bootstrap.

@bors r=Mark-Simulacrum

[bors]

📌 Commit 5349476 has been approved by Mark-Simulacrum

It is now in the queue for this repository.

[bors]

⌛ Testing commit 5349476 with merge 06194ca...

[bors]

☀️ Test successful - checks-actions
Approved by: Mark-Simulacrum
Pushing 06194ca to master...

[rust-timer]

Finished benchmarking commit (06194ca): 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)	-1.7%	[-1.7%, -1.7%]	1
All ❌✅ (primary)	-	-	0

Max RSS (memory usage)

Results (primary -4.4%)

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
Improvements ✅ (primary)	-4.4%	[-4.4%, -4.4%]	1
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	-4.4%	[-4.4%, -4.4%]	1

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: missing data
Artifact size: 319.81 MiB -> 319.82 MiB (0.00%)