1use bindgen;
 2use std::env;
 3use std::fs;
 4use std::path::absolute;
 5use std::path::PathBuf;
 6use std::time::SystemTime;
 7
 8fn main() {
 9    // Path to the C header file
10    let header_paths = [
11        "lib/spqlios/coeffs/coeffs_arithmetic.h",
12        "lib/spqlios/arithmetic/vec_znx_arithmetic.h",
13    ];
14
15    let out_path: PathBuf = PathBuf::from(env::var("OUT_DIR").unwrap());
16    let bindings_file = out_path.join("bindings.rs");
17
18    let regenerate: bool = header_paths.iter().any(|header| {
19        let header_metadata: SystemTime = fs::metadata(header)
20            .and_then(|m| m.modified())
21            .unwrap_or(SystemTime::UNIX_EPOCH);
22        let bindings_metadata: SystemTime = fs::metadata(&bindings_file)
23            .and_then(|m| m.modified())
24            .unwrap_or(SystemTime::UNIX_EPOCH);
25        header_metadata > bindings_metadata
26    });
27
28    if regenerate {
29        // Generate the Rust bindings
30        let mut builder: bindgen::Builder = bindgen::Builder::default();
31        for header in header_paths {
32            builder = builder.header(header);
33        }
34
35        let bindings = builder
36            .generate_comments(false) // Optional: includes comments in bindings
37            .generate_inline_functions(true) // Optional: includes inline functions
38            .generate()
39            .expect("Unable to generate bindings");
40
41        // Write the bindings to the OUT_DIR
42        bindings
43            .write_to_file(&bindings_file)
44            .expect("Couldn't write bindings!");
45    }
46
47    println!(
48        "cargo:rustc-link-search=native={}",
49        absolute("./lib/build/spqlios").unwrap().to_str().unwrap()
50    );
51    println!("cargo:rustc-link-lib=static=spqlios"); //"cargo:rustc-link-lib=dylib=spqlios"
52}