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use std::env;
use std::path::PathBuf;
fn main() {
let piolib_dir = PathBuf::from("piolib-src");
let include_dir = piolib_dir.join("include");
println!("cargo:rerun-if-changed=wrapper.h");
// Build the library using cmake
let dst = cmake::Config::new(&piolib_dir)
.define("BUILD_SHARED_LIBS", "OFF")
// .cflag("-fkeep-inline-functions")
.build();
println!("cargo:rustc-link-search=native={}/lib", dst.display());
println!("cargo:rustc-link-lib=static=pio");
let out_path = PathBuf::from(env::var("OUT_DIR").unwrap());
let wrapper_c_path = out_path.join("bindgen_wrappers.c");
// Generate bindings
let bindings = bindgen::Builder::default()
.header("wrapper.h")
// https://rust-lang.github.io/rust-bindgen/faq.html#why-isnt-bindgen-generating-bindings-to-inline-functions
// This tells bindgen to generate the C code for static inline functions
.wrap_static_fns(true)
// This tells bindgen WHERE to write that C code
.wrap_static_fns_path(&wrapper_c_path)
// // Keep inline functions
// .clang_arg("-fkeep-inline-functions")
// Add the main include directory
.clang_arg(format!("-I{}", include_dir.display()))
// .clang_arg("-fkeep-inline-functions")
// .allowlist_recursively(true)
// // Explicitly allow list the functions/types if they are still missing
// .allowlist_function("pio_.*")
// .allowlist_type("pio_.*")
// .allowlist_var("pio.*")
// .allowlist_function("PIO_.*")
// .allowlist_type("PIO_.*")
// .allowlist_var("PIO.*")
// .enable_function_attribute_detection()
// .merge_extern_blocks(true)
// Handle C inline functions which are common in Pico SDK
// .generate_inline_functions(true)
// .generate_pure_virtual_functions(true)
// .generate_block(true)
// .generate_private_functions(true)
// .generate_cstr(true)
// .generate_comments(true)
.parse_callbacks(Box::new(bindgen::CargoCallbacks::new()))
.generate()
.expect("Unable to generate bindings");
bindings
.write_to_file(out_path.join("bindings.rs"))
.expect("Couldn't write bindings!");
// Get the project root directory where wrapper.h is located
let project_root = PathBuf::from(env::var("CARGO_MANIFEST_DIR").unwrap());
// NOW: Compile the generated C wrapper file so the __extern symbols exist
cc::Build::new()
.file(&wrapper_c_path)
// Add the directory containing wrapper.h
.include(&project_root)
// Add the piolib include directories
.include(&include_dir)
.include(piolib_dir.join("include/piolib"))
.compile("bindgen_wrappers");
}