rustc-version-rs

A library for querying the version of a installed rustc compiler.

For more details, see the docs.

Getting Started

rustc-version-rs is available on crates.io. Add the following dependency to your Cargo manifest to get the latest version of the 0.1 branch: ```toml [dependencies]

rustc_version = "0.1.*" ```

To always get the latest version, add this git repository to your Cargo manifest:

toml [dependencies.rustc_version] git = "https://github.com/Kimundi/rustc-version-rs"

Example

```rust // This could be a cargo build script

extern crate rustcversion; use rustcversion::{version, versionmatches, versionmeta, Channel};

fn main() { // Assert we haven't travelled back in time assert!(version().major >= 1);

// Set cfg flags depending on release channel
match version_meta().channel {
    Channel::Stable => {
        println!("cargo:rustc-cfg=RUSTC_IS_STABLE");
    }
    Channel::Beta => {
        println!("cargo:rustc-cfg=RUSTC_IS_BETA");
    }
    Channel::Nightly => {
        println!("cargo:rustc-cfg=RUSTC_IS_NIGHTLY");
    }
    Channel::Dev => {
        println!("cargo:rustc-cfg=RUSTC_IS_DEV");
    }
}

// Directly check a semver version requirment
if version_matches(">= 1.4.0") {
    println!("cargo:rustc-cfg=compiler_has_important_bugfix");
}

} ```