Rocket/lib/build.rs

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Rust
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//! This tiny build script ensures that rocket is not compiled with an
//! incompatible version of rust.
extern crate yansi;
extern crate version_check;
use yansi::Color::{Red, Yellow, Blue, White};
use version_check::{supports_features, is_min_version};
// Specifies the minimum nightly version needed to compile Rocket.
const MIN_VERSION: &'static str = "1.19.0-nightly";
// Convenience macro for writing to stderr.
macro_rules! printerr {
($($arg:tt)*) => ({
use std::io::prelude::*;
write!(&mut ::std::io::stderr(), "{}\n", format_args!($($arg)*))
.expect("Failed to write to stderr.")
})
}
fn main() {
let (ok_channel, ok_version) = (supports_features(), is_min_version(MIN_VERSION));
let print_version_err = |version: &str| {
printerr!("{} {}. {} {}.",
White.paint("Installed version is:"),
Yellow.paint(version),
White.paint("Minimum required:"),
Yellow.paint(MIN_VERSION));
};
if let (Some(ok_channel), Some((ok_version, version))) = (ok_channel, ok_version) {
if !ok_channel {
printerr!("{} {}",
Red.paint("Error:").bold(),
White.paint("Rocket requires a nightly or dev version of Rust."));
print_version_err(&*version);
printerr!("{}{}{}",
Blue.paint("See the getting started guide ("),
White.paint("https://rocket.rs/guide/getting-started/"),
Blue.paint(") for more information."));
panic!("Aborting compilation due to incompatible compiler.")
}
if !ok_version {
printerr!("{} {}",
Red.paint("Error:").bold(),
White.paint("Rocket requires a newer version of rustc."));
printerr!("{}{}{}",
Blue.paint("Use `"),
White.paint("rustup update"),
Blue.paint("` or your preferred method to update Rust."));
print_version_err(&*version);
panic!("Aborting compilation due to incompatible compiler.")
}
} else {
println!("cargo:warning={}", "Rocket was unable to check rustc compatibility.");
println!("cargo:warning={}", "Build may fail due to incompatible rustc version.");
}
}