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llvm-20: Nightly compile time regression building comrak with release profile #137909

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@parasyte

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@parasyte

Building comrak with cargo build --release seems to never finish on x86_64 (both on Windows and Linux). It normally builds on the stable channel on my machine in approximately 26 seconds.

Bisect results:

searched nightlies: from nightly-2025-02-15 to nightly-2025-02-25
regressed nightly: nightly-2025-02-18
searched commit range: 5bc6231...ce36a96
regressed commit: ce36a96

bisected with cargo-bisect-rustc v0.6.9

Host triple: x86_64-pc-windows-msvc
Reproduce with:

cargo bisect-rustc --start=2025-02-15 --end=2025-02-25 --script "C:\\Program Files\\Git\\usr\\bin\\bash.exe" -- ./regress.sh

regress.sh:

#!/bin/bash

set -eux -o pipefail

timeout 60 cargo build --release

@rustbot modify labels: +regression-from-stable-to-nightly -regression-untriaged

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A-LLVMArea: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues.C-bugCategory: This is a bug.I-compiletimeIssue: Problems and improvements with respect to compile times.P-highHigh priorityllvm-fixed-upstreamIssue expected to be fixed by the next major LLVM upgrade, or backported fixesregression-from-stable-to-nightlyPerformance or correctness regression from stable to nightly.

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