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Document new way to not build LLVM 

Implemented in https://github.com/rust-lang/rust/pull/76349
This commit is contained in:
Aleksey Kladov 2020-09-13 21:11:06 +02:00 committed by Joshua Nelson
parent 773b3c3e95
commit d1651dbd5e
1 changed files with 13 additions and 4 deletions
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src/building/suggested.md
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@ -161,12 +161,21 @@ git worktree add -b my-feature ../rust2 master
You can then use that rust2 folder as a separate workspace for modifying You can then use that rust2 folder as a separate workspace for modifying
and building `rustc`! and building `rustc`!
## Building with system LLVM ## Skipping LLVM Build
By default, LLVM is built from source, and that can take significant amount of By default, LLVM is built from source, and that takes significant amount of
time. An alternative is to use LLVM already installed on your computer. time. One way to avoid that is to add this to `config.toml`:
This is specified in the `target` section of `config.toml`: ```toml
[llvm]
download-ci-llvm = true
```
Downloading LLVM from CI is still experimental though, and might not be
available on all platforms. Otherwise, we'd make it a default!
Another alternative is to use LLVM already installed on your computer. This is
specified in the `target` section of `config.toml`:
```toml ```toml
[target.x86_64-unknown-linux-gnu] [target.x86_64-unknown-linux-gnu]