servicepoint/servicepoint-binding-c
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do not overwrite header if content did not change

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This commit is contained in:
Vinzenz Schroeter 2025-05-28 12:25:30 +02:00
parent 2d937b9c3c
commit 6c3792330d
1 changed files with 39 additions and 16 deletions
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55
build.rs
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@ -4,32 +4,55 @@
//! the out directory. This can be used to use the build script as a command line tool from other
//! build tools.
use std::{env, fs::copy};
use std::{env, fs};
fn main() {
let crate_dir = env::var("CARGO_MANIFEST_DIR").unwrap();
println!("cargo::rerun-if-changed={crate_dir}");
println!("cargo::rerun-if-changed={crate_dir}/src");
println!("cargo::rerun-if-changed={crate_dir}/build.rs");
println!("cargo::rerun-if-changed={crate_dir}/Cargo.toml");
println!("cargo::rerun-if-changed={crate_dir}/Cargo.lock");
println!("cargo::rerun-if-changed={crate_dir}/cbindgen.toml");
println!("cargo::rerun-if-env-changed=SERVICEPOINT_HEADER_OUT");
let config =
cbindgen::Config::from_file(crate_dir.clone() + "/cbindgen.toml")
.unwrap();
let output_dir = env::var("OUT_DIR").unwrap();
let header_file = output_dir.clone() + "/servicepoint.h";
if let Ok(bindings) = cbindgen::generate_with_config(crate_dir, config) {
bindings.write_to_file(&header_file);
println!("cargo:include={output_dir}");
println!("cargo::rerun-if-env-changed=SERVICEPOINT_HEADER_OUT");
if let Ok(header_out) = env::var("SERVICEPOINT_HEADER_OUT") {
let header_copy = header_out + "/servicepoint.h";
println!("cargo:warning=Copying header to {header_copy}");
copy(header_file, &header_copy).unwrap();
println!("cargo::rerun-if-changed={header_copy}");
let bindings = match cbindgen::generate_with_config(crate_dir, config) {
Ok(bindings) => bindings,
Err(e) => {
eprintln!("cargo:warning=Servicepoint header could not be generated: {e:?}");
return;
}
} else {
eprintln!("cargo:warning=Servicepoint header could not be generated");
};
bindings.write_to_file(&header_file);
println!("cargo:include={output_dir}");
if let Ok(header_out) = env::var("SERVICEPOINT_HEADER_OUT") {
let header_copy = header_out + "/servicepoint.h";
if fs::exists(&header_copy).ok().unwrap_or(false) {
// check if content changed to prevent rebuild of dependents if not
let mut bindings_text = Vec::new();
bindings.write(&mut bindings_text);
match fs::read(&header_copy) {
Ok(old_content) if old_content == bindings_text => {
println!("cargo:warning=Header did not change, not updating timestamp");
return;
}
_ => {}
};
}
// file does not exist or is different
println!("cargo:warning=Copying header to {header_copy}");
fs::copy(header_file, &header_copy).unwrap();
println!("cargo::rerun-if-changed={header_copy}");
}
}