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build.rs
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build.rs
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use std::io::Write;
use std::env;
fn main(){
let target_os = env::var("CARGO_CFG_TARGET_OS");
match target_os.as_ref().map(|x| &**x) {
Ok("linux") | Ok("android") => println!("cargo:rustc-link-lib=dl"),
Ok("freebsd") | Ok("dragonfly") => println!("cargo:rustc-link-lib=c"),
// netbsd claims dl* will be available to any dynamically linked binary, but I haven’t
// found any libraries that have to be linked to on other platforms.
// What happens if the executable is not linked up dynamically?
Ok("openbsd") | Ok("bitrig") | Ok("netbsd") | Ok("macos") | Ok("ios") => {}
Ok("solaris") => {}
// dependencies come with winapi
Ok("windows") => {}
tos => {
writeln!(::std::io::stderr(),
"Building for an unknown target_os=`{:?}`!\nPlease report an issue ",
tos).expect("could not report the error");
::std::process::exit(0xfc);
}
}
maybe_test_helpers();
}
fn maybe_test_helpers() {
if env::var("OPT_LEVEL").ok().and_then(|v| v.parse().ok()).unwrap_or(0u64) != 0 {
// certainly not for testing, just skip.
return;
}
let mut outpath = if let Some(od) = env::var_os("OUT_DIR") { od } else { return };
let target = if let Some(t) = env::var_os("TARGET") { t } else { return };
let rustc = env::var_os("RUSTC").unwrap_or_else(|| { "rustc".into() });
outpath.push("/libtest_helpers.dll"); // extension for windows required, POSIX does not care.
let _ = ::std::process::Command::new(rustc)
.arg("src/test_helpers.rs")
.arg("-o")
.arg(outpath)
.arg("-O")
.arg("--target")
.arg(target)
.output();
// Ignore the failures here. We do not want failures of this thing to inhibit people from
// building and using the library. Might make it hard to debug why tests fail in case this
// library does not get built, though.
}