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fix: add rerun-if-changed to avoid unnecessary rebuilds #1

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Merged
littledivy merged 3 commits into from
Mar 3, 2026
Merged

fix: add rerun-if-changed to avoid unnecessary rebuilds #1

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ad6e3ec
fix: add rerun-if-changed to avoid unnecessary rebuilds
kajukitli Mar 3, 2026
cd67eca
refactor: deduplicate SOURCES/HEADERS constants
kajukitli Mar 3, 2026
3ef9ce8
fix: rustfmt formatting for long println
kajukitli Mar 3, 2026
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88 changes: 87 additions & 1 deletion build.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -22,6 +22,89 @@ fn main() {
generate_bindings(&out_dir, &include_dir);

println!("cargo:root={}", install_dir.display());

// Emit rerun-if-changed directives to avoid unnecessary rebuilds
emit_rerun_if_changed();
}

fn emit_rerun_if_changed() {
// Build script itself
println!("cargo:rerun-if-changed=build.rs");

// Template files
println!("cargo:rerun-if-changed=nghttp2/lib/includes/nghttp2/nghttp2ver.h.in");
println!("cargo:rerun-if-changed=nghttp2/lib/libnghttp2.pc.in");

// Header files
println!("cargo:rerun-if-changed=nghttp2/lib/includes/nghttp2/nghttp2.h");

// All source files
const SOURCES: &[&str] = &[
"nghttp2/lib/sfparse.c",

@littledivy littledivy Mar 3, 2026

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@kajukitli This is duplicate. See source files listed below

"nghttp2/lib/nghttp2_alpn.c",
"nghttp2/lib/nghttp2_buf.c",
"nghttp2/lib/nghttp2_callbacks.c",
"nghttp2/lib/nghttp2_debug.c",
"nghttp2/lib/nghttp2_extpri.c",
"nghttp2/lib/nghttp2_frame.c",
"nghttp2/lib/nghttp2_hd.c",
"nghttp2/lib/nghttp2_hd_huffman.c",
"nghttp2/lib/nghttp2_hd_huffman_data.c",
"nghttp2/lib/nghttp2_helper.c",
"nghttp2/lib/nghttp2_http.c",
"nghttp2/lib/nghttp2_map.c",
"nghttp2/lib/nghttp2_mem.c",
"nghttp2/lib/nghttp2_option.c",
"nghttp2/lib/nghttp2_outbound_item.c",
"nghttp2/lib/nghttp2_pq.c",
"nghttp2/lib/nghttp2_priority_spec.c",
"nghttp2/lib/nghttp2_queue.c",
"nghttp2/lib/nghttp2_rcbuf.c",
"nghttp2/lib/nghttp2_session.c",
"nghttp2/lib/nghttp2_stream.c",
"nghttp2/lib/nghttp2_submit.c",
"nghttp2/lib/nghttp2_version.c",
"nghttp2/lib/nghttp2_ratelim.c",
"nghttp2/lib/nghttp2_time.c",
];

for source in SOURCES {
println!("cargo:rerun-if-changed={}", source);
}

// Header dependencies
const HEADERS: &[&str] = &[
"nghttp2/lib/sfparse.h",
"nghttp2/lib/nghttp2_alpn.h",
"nghttp2/lib/nghttp2_buf.h",
"nghttp2/lib/nghttp2_callbacks.h",
"nghttp2/lib/nghttp2_debug.h",
"nghttp2/lib/nghttp2_extpri.h",
"nghttp2/lib/nghttp2_frame.h",
"nghttp2/lib/nghttp2_hd.h",
"nghttp2/lib/nghttp2_hd_huffman.h",
"nghttp2/lib/nghttp2_helper.h",
"nghttp2/lib/nghttp2_http.h",
"nghttp2/lib/nghttp2_int.h",
"nghttp2/lib/nghttp2_map.h",
"nghttp2/lib/nghttp2_mem.h",
"nghttp2/lib/nghttp2_net.h",
"nghttp2/lib/nghttp2_option.h",
"nghttp2/lib/nghttp2_outbound_item.h",
"nghttp2/lib/nghttp2_pq.h",
"nghttp2/lib/nghttp2_priority_spec.h",
"nghttp2/lib/nghttp2_queue.h",
"nghttp2/lib/nghttp2_ratelim.h",
"nghttp2/lib/nghttp2_rcbuf.h",
"nghttp2/lib/nghttp2_session.h",
"nghttp2/lib/nghttp2_stream.h",
"nghttp2/lib/nghttp2_submit.h",
"nghttp2/lib/nghttp2_time.h",
];

for header in HEADERS {
println!("cargo:rerun-if-changed={}", header);
}
}

struct NgHttp2Version {
Expand Down Expand Up @@ -201,6 +284,10 @@ fn generate_bindings(out_dir: &Path, include_dir: &Path) {
builder = builder.clang_arg(format!("-D{}", ssize_t_def));
}

// Note: We don't use CargoCallbacks here because it would emit
// rerun-if-changed for generated headers in OUT_DIR (whose path changes
// between builds) and system headers. We manually emit rerun-if-changed
// for the source files in emit_rerun_if_changed() instead.
let bindings = builder
// Only include nghttp2 symbols
.allowlist_function("nghttp2_.*")
Expand All @@ -220,7 +307,6 @@ fn generate_bindings(out_dir: &Path, include_dir: &Path) {
.blocklist_function(".*vprintf.*")
.blocklist_type(".*va_list.*")
.blocklist_type("nghttp2_debug_vprintf_callback")
.parse_callbacks(Box::new(bindgen::CargoCallbacks::new()))
.generate()
.expect("Failed to generate bindings");

Expand Down