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fn main() {
// detect docs rs builder so we don't try to link to macos/freebsd libs while cross compiling
let docs_builder = std::env::var("DOCS_RS").is_ok();
let target_os = std::env::var("CARGO_CFG_TARGET_OS").unwrap_or_default();
if (target_os == "macos" || target_os == "freebsd" || target_os == "openbsd") && !docs_builder {
build_wrapper();
}
}
fn build_wrapper() {
use std::env;
use std::path::PathBuf;
// Tell cargo to look for shared libraries in the specified directory
//println!("cargo:rustc-link-search=/path/to/lib");
// Tell cargo to tell rustc to link the system bzip2
// shared library.
//println!("cargo:rustc-link-lib=bz2");
// Tell cargo to invalidate the built crate whenever the wrapper changes
println!("cargo:rerun-if-changed=wrapper.h");
// The bindgen::Builder is the main entry point
// to bindgen, and lets you build up options for
// the resulting bindings.
let bindings = bindgen::Builder::default()
// The input header we would like to generate
// bindings for.
.header("wrapper.h")
// Tell cargo to invalidate the built crate whenever any of the
// included header files changed.
.parse_callbacks(Box::new(bindgen::CargoCallbacks::new()))
// Finish the builder and generate the bindings.
.generate()
// Unwrap the Result and panic on failure.
.expect("Unable to generate bindings");
// Write the bindings to the $OUT_DIR/bindings.rs file.
let out_path = PathBuf::from(env::var("OUT_DIR").unwrap());
bindings
.write_to_file(out_path.join("bindings.rs"))
.expect("Couldn't write bindings!");
}