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Emphasize use of most specific module for RUST_LOG #290

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Mar 23, 2019
Merged

Emphasize use of most specific module for RUST_LOG #290

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3441465
Use eddyb's suggestion from #11 about logging
mark-i-m Mar 19, 2019
bc20a42
oops
mark-i-m Mar 23, 2019
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7 changes: 4 additions & 3 deletions src/compiler-debugging.md
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Expand Up @@ -162,9 +162,10 @@ your log filter, e.g. to get the logs for a specific module, you can run the
compiler as `RUST_LOG=module::path rustc my-file.rs`. All `debug!` output will
then appear in standard error.

Note that unless you use a very strict filter, the logger will emit a *lot*
of output - so it's typically a good idea to pipe standard error to a file
and look at the log output with a text editor.
**Note that unless you use a very strict filter, the logger will emit a lot of
output, so use the most specific module(s) you can (comma-separated if
multiple)**. It's typically a good idea to pipe standard error to a file and
look at the log output with a text editor.

So to put it together.

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