lvgl-rs/lvgl-sys/build.rs

142 lines
4.7 KiB
Rust

use cc::Build;
use std::{env, path::Path, path::PathBuf};
static CONFIG_NAME: &str = "DEP_LV_CONFIG_PATH";
fn main() {
let project_dir = PathBuf::from(env::var("CARGO_MANIFEST_DIR").unwrap())
.canonicalize()
.unwrap();
let shims_dir = project_dir.join("shims");
let vendor = project_dir.join("vendor");
let vendor_src = vendor.join("lvgl").join("src");
let lv_config_dir = {
let conf_path = env::var(CONFIG_NAME)
.map(|raw_path| PathBuf::from(raw_path))
.unwrap_or_else(|_| {
match std::env::var("DOCS_RS") {
Ok(_) => {
// We've detected that we are building for docs.rs
// so let's use the vendored `lv_conf.h` file.
vendor.join("include")
}
Err(_) => panic!(
"The environment variable {} is required to be defined",
CONFIG_NAME
),
}
});
if !conf_path.exists() {
panic!(
"Directory {} referenced by {} needs to exist",
conf_path.to_string_lossy(),
CONFIG_NAME
);
}
if !conf_path.is_dir() {
panic!("{} needs to be a directory", CONFIG_NAME);
}
if !conf_path.join("lv_conf.h").exists() {
panic!(
"Directory {} referenced by {} needs to contain a file called lv_conf.h",
conf_path.to_string_lossy(),
CONFIG_NAME
);
}
println!(
"cargo:rerun-if-changed={}",
conf_path.join("lv_conf.h").to_str().unwrap()
);
conf_path
};
let mut cfg = Build::new();
add_c_files(&mut cfg, vendor_src.join("lv_core"));
add_c_files(&mut cfg, vendor_src.join("lv_draw"));
add_c_files(&mut cfg, vendor_src.join("lv_font"));
add_c_files(&mut cfg, vendor_src.join("lv_gpu"));
add_c_files(&mut cfg, vendor_src.join("lv_hal"));
add_c_files(&mut cfg, vendor_src.join("lv_misc"));
add_c_files(&mut cfg, vendor_src.join("lv_themes"));
add_c_files(&mut cfg, vendor_src.join("lv_widgets"));
add_c_files(&mut cfg, &lv_config_dir);
add_c_files(&mut cfg, &shims_dir);
cfg.define("LV_CONF_INCLUDE_SIMPLE", Some("1"))
.include(&vendor_src)
.include(&vendor)
.warnings(false)
.include(&lv_config_dir)
.compile("lvgl");
let mut cc_args = vec![
"-DLV_CONF_INCLUDE_SIMPLE=1",
"-I",
lv_config_dir.to_str().unwrap(),
"-I",
vendor.to_str().unwrap(),
"-fvisibility=default",
];
// Set correct target triple for bindgen when cross-compiling
let target = env::var("TARGET").expect("Cargo build scripts always have TARGET");
let host = env::var("HOST").expect("Cargo build scripts always have HOST");
if target != host {
cc_args.push("-target");
cc_args.push(target.as_str());
}
let mut additional_args = Vec::new();
if target.ends_with("emscripten") {
if let Ok(em_path) = env::var("EMSDK") {
additional_args.push("-I".to_string());
additional_args.push(format!(
"{}/upstream/emscripten/system/include/libc",
em_path
));
additional_args.push("-I".to_string());
additional_args.push(format!(
"{}/upstream/emscripten/system/lib/libc/musl/arch/emscripten",
em_path
));
additional_args.push("-I".to_string());
additional_args.push(format!(
"{}/upstream/emscripten/system/include/SDL",
em_path
));
}
}
let out_path = PathBuf::from(env::var("OUT_DIR").unwrap());
let bindings = bindgen::Builder::default()
.header(shims_dir.join("lvgl_sys.h").to_str().unwrap())
.generate_comments(false)
.derive_default(true)
.layout_tests(false)
.use_core()
.rustfmt_bindings(true)
.ctypes_prefix("cty")
.clang_args(&cc_args)
.clang_args(&additional_args)
.generate()
.expect("Unable to generate bindings");
bindings
.write_to_file(out_path.join("bindings.rs"))
.expect("Can't write bindings!");
}
fn add_c_files(build: &mut cc::Build, path: impl AsRef<Path>) {
for e in path.as_ref().read_dir().unwrap() {
let e = e.unwrap();
let path = e.path();
if e.file_type().unwrap().is_dir() {
// skip dirs for now
} else if path.extension().and_then(|s| s.to_str()) == Some("c") {
build.file(&path);
}
}
}