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May 29, 2020
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Document RUSTFLAGS_STAGE_ bootstrap environment variables #728

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Document `RUSTFLAGS_STAGE_`
LeSeulArtichaut May 29, 2020
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Fix typos
LeSeulArtichaut May 29, 2020
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10 changes: 10 additions & 0 deletions src/building/bootstrapping.md
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Expand Up @@ -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
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