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strip -Wlinker-messages wrappers from rust-lld rmake test #138052

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Mar 12, 2025
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strip -Wlinker-messages wrappers from rust-lld rmake test #138052

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5 changes: 3 additions & 2 deletions tests/run-make/rust-lld/rmake.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -60,7 +60,8 @@ fn main() {
}

fn find_lld_version_in_logs(stderr: String) -> bool {
let lld_version_re =
Regex::new(r"^warning: linker std(out|err): LLD [0-9]+\.[0-9]+\.[0-9]+").unwrap();
// Strip the `-Wlinker-messages` wrappers prefixing the linker output.
let stderr = Regex::new(r"warning: linker std(out|err):").unwrap().replace_all(&stderr, "");
let lld_version_re = Regex::new(r"^LLD [0-9]+\.[0-9]+\.[0-9]+").unwrap();
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Maybe it would be enough to use a single regex Regex::new(r"^.*LLD [0-9]+\.[0-9]+\.[0-9]+").unwrap()

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Hmm. It's specifically looking for a line version in the output, not a prefix, otherwise it could be searching the entire stderr. I did it this way because I found it likely the message wrapper stripping will be moved in run_make_support once it's solidified, esp if we encounter more searching in linker output in the future. So while I'm not particularly convinced, I'm also not too invested in any approach either.

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@jieyouxu jieyouxu Mar 5, 2025 •
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I can't say I'm a huge fan of this regex (before or after) since it really does feel fragile (we're doing text processing on the human-readable output of lld but with the rustc -Wlinker-messages wrappers on top, which together can totally change between lld versions since there AFAIK reasonably has no stability guarantee on that specific shape). But it does seem like we would want to test -Wlinker-messages so...

stderr.lines().any(|line| lld_version_re.is_match(line.trim()))
}
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