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Document `RUSTFLAGS_STAGE_` bootstrap environment variables (#728) 

* Document `RUSTFLAGS_STAGE_`

* Fix typos

Co-authored-by: Yuki Okushi <huyuumi.dev@gmail.com>
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LeSeulArtichaut 2020-05-29 18:20:24 +02:00 committed by GitHub
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10
src/building/bootstrapping.md
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@ -159,6 +159,16 @@ links against.
This `stage2/bin/rustc` compiler is shipped to end-users, along with the
`stage 1 {std,rustc}` artifacts.
## Passing stage-specific flags to `rustc`
`x.py` allows you to pass stage-specific flags to `rustc` when bootstrapping.
The `RUSTFLAGS_STAGE_0`, `RUSTFLAGS_STAGE_1` and `RUSTFLAGS_STAGE_2`
environment variables pass the given flags when building stage 0, 1, and 2
artifacts respectively.
Additionally, the `RUSTFLAGS_STAGE_NOT_0` variable, as its name suggests, pass
the given arguments if the stage is not 0.
## Environment Variables
During bootstrapping, there are a bunch of compiler-internal environment