pyo3/build.rs

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Rust
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use std::env;
use std::io::Write;
const CFG_KEY: &'static str = "py_sys_config";
#[cfg(feature="python27-sys")]
const PYTHONSYS_ENV_VAR: &'static str = "DEP_PYTHON27_PYTHON_FLAGS";
#[cfg(feature="python3-sys")]
const PYTHONSYS_ENV_VAR: &'static str = "DEP_PYTHON3_PYTHON_FLAGS";
fn main() {
// python{27,3.x}-sys/build.rs passes python interpreter compile flags via
// environment variable (using the 'links' mechanism in the cargo.toml).
let flags = match env::var(PYTHONSYS_ENV_VAR) {
Ok(flags) => flags,
Err(_) => {
writeln!(std::io::stderr(),
"Environment variable {} not found - this is supposed to be \
exported from the pythonXX-sys dependency, so the build chain is broken",
PYTHONSYS_ENV_VAR).unwrap();
std::process::exit(1);
}
};
for f in flags.split(",") {
// write out flags as --cfg so that the same #cfg blocks can be used
// in rust-cpython as in the -sys libs
let key_and_val: Vec<&str> = f.split("=").collect();
let key = key_and_val[0];
let val = key_and_val[1];
if key.starts_with("FLAG") {
println!("cargo:rustc-cfg={}=\"{}\"", CFG_KEY, &key[5..])
} else {
println!("cargo:rustc-cfg={}=\"{}_{}\"", CFG_KEY, &key[4..], val);
}
}
}