Function ucc::export_csrc

pub fn export_csrc()

This exports the csrc directory to the environment variable, so that it can be found and included by crates that depend on the current crate.

This relies on a links property to be set in Cargo.toml. See the cargo docs for more info. In theory, the value of the links property does not matter as long as it is distinct across crates. It is recommended to just use the crate name.