[−][src]Crate target_spec
Evaluate Cargo.toml
target specifications against platform triples.
Cargo supports platform-specific dependencies. These dependencies can be specified in one of two ways:
# 1. As Rust-like `#[cfg]` syntax.
[target.'cfg(all(unix, target_arch = "x86_64"))'.dependencies]
native = { path = "native/x86_64" }
# 2. Listing out the full target triple.
[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)));
Modules
custom_platforms | Support for creating custom platforms. |
Structs
Platform | A platform to evaluate target specs against. |
TargetSpec | A parsed target specification or triple, as found in a |
Enums
EvalError | An error that occurred during target evaluation. |
ParseError | An error that occurred while attempting to parse a target specification. |
TargetFeatures | A set of target features to match. |
Functions
eval | Evaluates the given spec against the provided target and returns |