#embedded #no-std #build #const #static

no-std build build_const

library for creating importable constants from build.rs or a script

5 releases

Uses old Rust 2015

0.2.2 Apr 20, 2021
0.2.1 Apr 13, 2018
0.2.0 May 31, 2017
0.1.1 May 30, 2017
0.1.0 May 29, 2017

#187 in Embedded development

Download history 36976/week @ 2023-02-14 44086/week @ 2023-02-21 40057/week @ 2023-02-28 40798/week @ 2023-03-07 37825/week @ 2023-03-14 39237/week @ 2023-03-21 46523/week @ 2023-03-28 35786/week @ 2023-04-04 38532/week @ 2023-04-11 42919/week @ 2023-04-18 40806/week @ 2023-04-25 42566/week @ 2023-05-02 44337/week @ 2023-05-09 44439/week @ 2023-05-16 45456/week @ 2023-05-23 39230/week @ 2023-05-30

180,738 downloads per month
Used in 288 crates (2 directly)

MIT license

11KB
139 lines

build_const: crate for creating constants in your build script

Rust library for creating importable constants from build.rs or a script

See the crate documentation and the crate on crates.io


lib.rs:

build_const: crate for creating constants in your build script

The build_const crate exists to help create rust constant files at compile time or in a generating script. It is ultra simple and lightweight, making constant creation a simple matter.

Recommended use: when developing make your constants in build.rs. Once your constants are fairly stable create a script instead and have your constants file be generated in either a single file or an external crate that you can bring in as a dependency.

Example

Include build_const = VERSION in your Cargo.toml file. For no_std support (macros only) use default-features = false.

See ConstWriter for how to use in a build.rs or script. To then import a "constants.rs" file created in build.rs use:

#[macro_use]
extern crate build_const;

build_const!("constants");
println!("VALUE: {}", VALUE);
println!("VALUE: {}", ARRAY);

For writing constants in a script, the macro src_file! is also provided.

// will write files to `/src/constants.rs`
let mut consts = ConstWriter::from_path(&Path::from(src_file!("constants.rs"))).unwrap();
// ... use consts

No runtime deps

Features

  • std