Function can_compile

build.rs:44–93

Test whether the rustc at `var("RUSTC")` can compile the given code.

(test: T)

/// Test whether the rustc at `var("RUSTC")` can compile the given code.
fn can_compile<T: AsRef<str>>(test: T) -> bool {
    use std::process::Stdio;

    let rustc = var("RUSTC").unwrap();
    let target = var("TARGET").unwrap();

    // Use `RUSTC_WRAPPER` if it's set, unless it's set to an empty string, as
    // documented [here].
    // [here]: https://doc.rust-lang.org/cargo/reference/environment-variables.html#environment-variables-cargo-reads
    let wrapper = var("RUSTC_WRAPPER")
        .ok()
        .and_then(|w| if w.is_empty() { None } else { Some(w) });

    let mut cmd = if let Some(wrapper) = wrapper {
        let mut cmd = std::process::Command::new(wrapper);
        // The wrapper's first argument is supposed to be the path to rustc.
        cmd.arg(rustc);
        cmd
    } else {
        std::process::Command::new(rustc)
    };

    cmd.arg("--crate-type=rlib") // Don't require `main`.
        .arg("--emit=metadata") // Do as little as possible but still parse.
        .arg("--target")
        .arg(target)
        .arg("-o")
        .arg("-")
        .stdout(Stdio::null()); // We don't care about the output (only whether it builds or not)

    // If Cargo wants to set RUSTFLAGS, use that.
    if let Ok(rustflags) = var("CARGO_ENCODED_RUSTFLAGS") {
        if !rustflags.is_empty() {
            for arg in rustflags.split('\x1f') {
                cmd.arg(arg);
            }
        }
    }

    let mut child = cmd
        .arg("-") // Read from stdin.
        .stdin(Stdio::piped()) // Stdin is a pipe.
        .stderr(Stdio::null()) // Errors from feature detection aren't interesting and can be confusing.
        .spawn()
        .unwrap();

    writeln!(child.stdin.take().unwrap(), "{}", test.as_ref()).unwrap();

    child.wait().unwrap().success()
}