use std::env;
use std::path::PathBuf;
use walkdir::WalkDir;
fn compile_libunwind() {
let mut cfg = cc::Build::new();
cfg.warnings(false);
cfg.cpp_set_stdlib(None);
cfg.cpp(true);
cfg.flag("-std=c++11");
cfg.flag("-fno-exceptions");
cfg.flag("-fno-rtti");
cfg.flag("-fstrict-aliasing");
cfg.flag("-fvisibility=hidden");
cfg.flag("-funwind-tables");
cfg.define("_LIBUNWIND_NO_HEAP", None);
cfg.define("_LIBUNWIND_IS_BAREMETAL", None);
cfg.define("_LIBUNWIND_IS_NATIVE_ONLY", None);
cfg.define("_LIBUNWIND_HAS_NO_THREADS", None);
cfg.define("NDEBUG", None);
cfg.include("llvm-libunwind/include");
cfg.include("include");
let libunwind_sources = [
"llvm-libunwind/src/UnwindRegistersRestore.S",
"llvm-libunwind/src/UnwindRegistersSave.S",
"llvm-libunwind/src/libunwind.cpp",
"llvm-libunwind/src/Unwind-EHABI.cpp",
];
for source in &libunwind_sources {
cfg.file(source);
}
cfg.compile("llvm_libunwind");
}
fn gen_libunwind_bindings() {
let args = vec![
"-nostdlibinc".to_string(),
"-ffreestanding".to_string(),
"-I".to_string(),
"llvm-libunwind/include".to_string(),
"-target".to_string(),
env::var("TARGET").unwrap(),
"-D_LIBUNWIND_IS_NATIVE_ONLY".to_string(),
];
let bindings = bindgen::Builder::default()
.header("llvm-libunwind/include/libunwind.h")
.use_core()
.ctypes_prefix("::cty")
.prepend_enum_name(false)
.parse_callbacks(Box::new(bindgen::CargoCallbacks))
.clang_args(&args)
.generate()
.expect("Unable to generate bindings");
let out_path = PathBuf::from(env::var("OUT_DIR").unwrap());
bindings
.write_to_file(out_path.join("bindings.rs"))
.expect("Couldn't write bindings!");
}
fn main() {
compile_libunwind();
gen_libunwind_bindings();
for entry in WalkDir::new("llvm-libunwind")
.into_iter()
.chain(WalkDir::new("include").into_iter())
{
println!(
"cargo:rerun-if-changed={}",
entry.unwrap().path().to_str().unwrap()
);
}
}