32 lines
1.1 KiB
Rust
32 lines
1.1 KiB
Rust
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// Capture this crate's nightly sysroot at build time so the runtime
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// driver doesn't have to guess. Cargo runs this against the
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// rust-toolchain.toml-pinned toolchain, which is the same nightly that
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// will dynamically link rustc_driver into the binary at run time. The
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// pair is what keeps rustc_driver happy: querying with the
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// wrong-versioned sysroot is the classic "VERSION_INCOMPATIBLE" trap.
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fn main() {
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println!("cargo:rerun-if-changed=build.rs");
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println!("cargo:rerun-if-changed=rust-toolchain.toml");
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let output = std::process::Command::new("rustc")
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.arg("--print")
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.arg("sysroot")
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.output()
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.expect("invoke rustc --print sysroot during build.rs");
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if !output.status.success() {
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panic!(
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"rustc --print sysroot failed during build: {}",
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String::from_utf8_lossy(&output.stderr)
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);
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}
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let sysroot = String::from_utf8(output.stdout)
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.expect("rustc --print sysroot returned non-UTF-8")
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.trim()
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.to_string();
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println!("cargo:rustc-env=CSTAT_EXTRACT_RUSTC_SYSROOT={sysroot}");
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}
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