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use std::env;
use std::process::Command;
use std::str;
// The rustc-cfg strings below are *not* public API. Please let us know by
// opening a GitHub issue if your build environment requires some way to enable
// these cfgs other than by executing our build script.
fn main() {
let compiler = match rustc_version() {
Some(compiler) => compiler,
None => return,
};
if compiler.minor < 36 {
println!("cargo:rustc-cfg=syn_omit_await_from_token_macro");
}
if compiler.minor < 39 {
println!("cargo:rustc-cfg=syn_no_const_vec_new");
}
if compiler.minor < 40 {
println!("cargo:rustc-cfg=syn_no_non_exhaustive");
}
if compiler.minor < 56 {
println!("cargo:rustc-cfg=syn_no_negative_literal_parse");
}
if !compiler.nightly {
println!("cargo:rustc-cfg=syn_disable_nightly_tests");
}
}
struct Compiler {
minor: u32,
nightly: bool,
}
fn rustc_version() -> Option<Compiler> {
let rustc = env::var_os("RUSTC")?;
let output = Command::new(rustc).arg("--version").output().ok()?;
let version = str::from_utf8(&output.stdout).ok()?;
let mut pieces = version.split('.');
if pieces.next() != Some("rustc 1") {
return None;
}
let minor = pieces.next()?.parse().ok()?;
let nightly = version.contains("nightly") || version.ends_with("-dev");
Some(Compiler { minor, nightly })
}
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