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Print to stderr consistently in bootstrap #96712

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jyn514 opened this issue May 4, 2022 · 6 comments
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Print to stderr consistently in bootstrap #96712

jyn514 opened this issue May 4, 2022 · 6 comments
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E-easy Call for participation: Easy difficulty. Experience needed to fix: Not much. Good first issue. T-bootstrap Relevant to the bootstrap subteam: Rust's build system (x.py and src/bootstrap)

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@jyn514
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jyn514 commented May 4, 2022 •
edited by rustbot
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Bootstrap is unfortunately quite inconsistent about which it uses currently :(

$ rg -g '!build.rs' println src/bootstrap/ | grep -v eprintln | wc -l
88
$ rg eprintln src/bootstrap/ | wc -l
60

stderr probably makes more sense? but I don't know when someone would look at just stdout or just stderr; having a hard time imagining use cases.

cc @bjorn3

Originally posted by @jyn514 in #96687 (comment)
@bjorn3
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bjorn3 commented May 4, 2022

For example ./x.py test >test_log.txt would show warnings on the terminal as stderr is not redirected but put the results of all tests in test_log.txt. Not that I can recall every doing something like that, but it could be useful I guess.

@jyn514
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jyn514 commented May 4, 2022 •
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Sure, seems fine. Let's use eprintln consistently then.

@rustbot label +E-easy +A-rustbuild

@rustbot rustbot added T-bootstrap Relevant to the bootstrap subteam: Rust's build system (x.py and src/bootstrap) E-easy Call for participation: Easy difficulty. Experience needed to fix: Not much. Good first issue. labels May 4, 2022
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@rustbot claim

@jyn514 jyn514 changed the title Decide whether to print to stdout or stderr in bootstrap Print to stderr consistently in bootstrap May 5, 2022
@lionellloh
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@raiyansayeed are you still working on this?

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Hey yes I'm still working on it, have most of it implemented I think. I just haven't gotten the time to review my code / push, although I think I should be able to do it by the end of this week.

@raiyansayeed raiyansayeed mentioned this issue May 26, 2022
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matthiaskrgr added a commit to matthiaskrgr/rust that referenced this issue May 27, 2022
@matthiaskrgr
Rollup merge of rust-lang#97411 - raiyansayeed:print-stderr-consisten…
1174dba 
…tly, r=Mark-Simulacrum

Print stderr consistently

Solves rust-lang#96712

I tried to follow what I perceived as the general consensus for error messages in boostrap i.e messages that were ..
* resulting from an Err(...) =>
* literally called as "Error: ...."
* by the end of the block scope forced to run a panic! or process::exit with a guaranteed non-zero error code.
@jyn514
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jyn514 commented Jun 20, 2022

Looks like this was done in #97411, thanks!

@jyn514 jyn514 closed this as completed Jun 20, 2022
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E-easy Call for participation: Easy difficulty. Experience needed to fix: Not much. Good first issue. T-bootstrap Relevant to the bootstrap subteam: Rust's build system (x.py and src/bootstrap)
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