Crate cc [] [src]

A library for build scripts to compile custom C code

This library is intended to be used as a build-dependencies entry in Cargo.toml:

cc = "1.0"

The purpose of this crate is to provide the utility functions necessary to compile C code into a static archive which is then linked into a Rust crate. Configuration is available through the Build struct.

This crate will automatically detect situations such as cross compilation or other environment variables set by Cargo and will build code appropriately.

The crate is not limited to C code, it can accept any source code that can be passed to a C or C++ compiler. As such, assembly files with extensions .s (gcc/clang) and .asm (MSVC) can also be compiled.


To parallelize computation, enable the parallel feature for the crate.

cc = { version = "1.0", features = ["parallel"] }

To specify the max number of concurrent compilation jobs, set the NUM_JOBS environment variable to the desired amount.

Cargo will also set this environment variable when executed with the -jN flag.

If NUM_JOBS is not set, the RAYON_NUM_THREADS environment variable can also specify the build paralellism.


Use the Build struct to compile src/foo.c:

extern crate cc;

fn main() {
        .define("FOO", Some("bar"))



A helper module to probe the Windows Registry when looking for windows-specific tools.



A builder for compilation of a native static library.


Represents an internal error that occurred, with an explanation.


Configuration used to represent an invocation of a C compiler.