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Rollup merge of #78842 - shepmaster:bootstrap-rustfmt, r=Mark-Simulacrum

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Honor the rustfmt setting in config.toml

Prior to this, setting the rustfmt configuration was ignored:

```
% mkdir example

% cd example

% ../configure --set build.rustfmt=/usr/bin/true

% ../x.py fmt
./x.py fmt is not supported on this channel
failed to run: /Users/shep/Projects/rust/example/build/bootstrap/debug/bootstrap fmt
Build completed unsuccessfully in 0:00:01
```

And after:

```
% ../x.py fmt
Build completed successfully in 0:00:11
```

r? `@Mark-Simulacrum`
This commit is contained in:
Mara Bos 2020-11-08 13:36:25 +01:00 committed by GitHub
commit cb90042049
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1 changed files with 12 additions and 5 deletions
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17
src/bootstrap/config.rs
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@ -913,11 +913,18 @@ impl Config {
set(&mut config.missing_tools, t.missing_tools);
}
// Cargo does not provide a RUSTFMT environment variable, so we
// synthesize it manually. Note that we also later check the config.toml
// and set this to that path if necessary.
let rustfmt = config.initial_rustc.with_file_name(exe("rustfmt", config.build));
config.initial_rustfmt = if rustfmt.exists() { Some(rustfmt) } else { None };
config.initial_rustfmt = config.initial_rustfmt.or_else({
let build = config.build;
let initial_rustc = &config.initial_rustc;
move || {
// Cargo does not provide a RUSTFMT environment variable, so we
// synthesize it manually.
let rustfmt = initial_rustc.with_file_name(exe("rustfmt", build));
if rustfmt.exists() { Some(rustfmt) } else { None }
}
});
// Now that we've reached the end of our configuration, infer the
// default values for all options that we haven't otherwise stored yet.