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rustc-dev-guide: document `COMPILER` and `COMPILER_FOR` tracing targets

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许杰友 Jieyou Xu (Joe) 2025-02-15 22:59:01 +08:00
parent b1ea20268a
commit 141a8a1962
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src/building/bootstrapping/debugging-bootstrap.md
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@ -76,6 +76,14 @@ $ BOOTSTRAP_TRACING=CONFIG_HANDLING=TRACE ./x build library --stage 1
[tracing-env-filter]: https://docs.rs/tracing-subscriber/0.3.19/tracing_subscriber/filter/struct.EnvFilter.html
##### FIXME(#96176): specific tracing for `compiler()` vs `compiler_for()`
The additional targets `COMPILER` and `COMPILER_FOR` are used to help trace what
`builder.compiler()` and `builder.compiler_for()` does. They should be removed
if [#96176][cleanup-compiler-for] is resolved.
[cleanup-compiler-for]: https://github.com/rust-lang/rust/issues/96176
### Using `tracing` in bootstrap
Both `tracing::*` macros and the `tracing::instrument` proc-macro attribute need to be gated behind `tracing` feature. Examples: