5 releases
Uses old Rust 2015
0.2.2 | Apr 20, 2021 |
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0.2.1 | Apr 13, 2018 |
0.2.0 | May 31, 2017 |
0.1.1 | May 30, 2017 |
0.1.0 | May 29, 2017 |
#125 in Build Utils
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Used in 260 crates
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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