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Set RUSTC and RUSTDOC env for child processes run through the proxy #2958

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Mar 10, 2022
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Set RUSTC and RUSTDOC env for child processes run through the proxy #2958

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13 changes: 13 additions & 0 deletions src/toolchain.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -401,6 +401,19 @@ impl<'a> InstalledCommonToolchain<'a> {

cmd.env("RUSTUP_TOOLCHAIN", &self.0.name);
cmd.env("RUSTUP_HOME", &self.0.cfg.rustup_dir);
// It's valid (although slightly cursed) to tell a rustup cargo proxy to use a custom rustc
// from a different toolchain.
if env::var("RUSTC").is_err() {
// Set RUSTC for the spawned binary. This serves two purposes:
// 1. It avoids the overhead of having to re-parse `settings.toml` on each proxy.
// In projects with many crates, this can have non-trivial overhead.
// 2. For build scripts, it provides an absolute path for RUSTC rather than forcing them to look it up in PATH.
// This allows them to find the sysroot path for the toolchain, rather than ending up somewhere in CARGO_HOME.
cmd.env("RUSTC", self.0.path.join("bin").join("rustc"));
}
if env::var("RUSTDOC").is_err() {
cmd.env("RUSTDOC", self.0.path.join("bin").join("rustdoc"));
}
}

fn set_ldpath(&self, cmd: &mut Command) {
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