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extern crate bindgen;
extern crate cc;
use std::env;
use std::path::PathBuf;
use std::process::Command;
fn main() {
let out_path = PathBuf::from(env::var("OUT_DIR").unwrap());
println!("cargo:rustc-link-search={:?}", out_path);
let _output = Command::new("git")
.arg("submodule")
.arg("update")
.arg("--init")
.arg("--recursive")
.arg("--remote")
.output()
.expect("Failed to execute git command.");
// build a static lib
cc::Build::new()
.file("src/rpi_ws281x/mailbox.c")
.file("src/rpi_ws281x/ws2811.c")
.file("src/rpi_ws281x/pwm.c")
.file("src/rpi_ws281x/pcm.c")
.file("src/rpi_ws281x/dma.c")
.file("src/rpi_ws281x/rpihw.c")
// create a static lib to make cross-compiling
// and uploading easier.
.shared_flag(false)
.compile("libws2811.a");
// link to the created static lib
println!("cargo:rustc-link-lib=static=ws2811");
// this environment variable is declared by rustc/cargo
// and is guaranteed to exist.
let target = env::var("TARGET").unwrap();
// The bindgen::Builder is the main entry point
// to bindgen, and lets you build up options for
// the resulting bindings.
let mut builder = bindgen::Builder::default()
// The input header we would like to generate
// bindings for.
.header("src/wrapper.h")
// generate an rust enum for the return type of ws2811_init (instead of the
// the default of creating module-level consts).
.rustified_enum("ws2811_return_t")
.clang_arg("-target")
.clang_arg(target);
// Specifying the -target above seems to be sufficient for clang, but
// just in case, allow for the user to override the toolset sysroot.
// Note: this should be the path to the GCC ARM sysroot, *not* the libclang
// sysroot!
if let Ok(sysroot) = env::var("RPI_WS281X_SYSROOT") {
builder = builder.clang_arg(format!("--sysroot={}", sysroot));
}
let bindings = builder
// 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.
bindings
.write_to_file(out_path.join("bindings.rs"))
.expect("Couldn't write bindings!");
}