Crate target_spec[−][src]
Expand description
Evaluate Cargo.toml target specifications against platform triples.
Cargo supports platform-specific dependencies. These dependencies can be specified in one of two ways:
[target.'cfg(all(unix, target_arch = "x86_64"))'.dependencies]
native = { path = "native/x86_64" }
[target.x86_64-pc-windows-gnu.dependencies]
winhttp = "0.4.0"target-spec provides the eval API which can be used to figure out whether such a
dependency will be included on a particular platform.
use target_spec::eval;
// Evaluate Rust-like `#[cfg]` syntax.
let cfg_target = "cfg(all(unix, target_arch = \"x86_64\"))";
assert_eq!(eval(cfg_target, "x86_64-unknown-linux-gnu"), Ok(Some(true)));
assert_eq!(eval(cfg_target, "i686-unknown-linux-gnu"), Ok(Some(false)));
assert_eq!(eval(cfg_target, "x86_64-pc-windows-msvc"), Ok(Some(false)));
// Evaluate a full target-triple.
assert_eq!(eval("x86_64-unknown-linux-gnu", "x86_64-unknown-linux-gnu"), Ok(Some(true)));
assert_eq!(eval("x86_64-unknown-linux-gnu", "x86_64-pc-windows-msvc"), Ok(Some(false)));For more advanced usage, see Platform and TargetSpec.
Re-exports
pub use errors::Error;Modules
Structs
A platform to evaluate target specs against.
A target expression.
A single, specific target, uniquely identified by a triple.
Enums
A set of target features to match.
A parsed target specification or triple, as found in a Cargo.toml file.
Functions
Evaluates the given spec against the provided target and returns Some(true) on a successful
match, and Some(false) on a failing match.