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use std::env;
fn main() {
println!("cargo:rerun-if-changed=build.rs");
let target = env::var("TARGET").expect("TARGET was not set");
if cfg!(feature = "llvm-libunwind") &&
((target.contains("linux") && !target.contains("musl")) ||
target.contains("fuchsia")) {
// Build the unwinding from libunwind C/C++ source code.
llvm_libunwind::compile();
} else if target.contains("linux") {
if target.contains("musl") {
// linking for musl is handled in lib.rs
llvm_libunwind::compile();
} else if !target.contains("android") {
println!("cargo:rustc-link-lib=gcc_s");
}
} else if target.contains("freebsd") {
println!("cargo:rustc-link-lib=gcc_s");
} else if target.contains("rumprun") {
println!("cargo:rustc-link-lib=unwind");
} else if target.contains("netbsd") {
println!("cargo:rustc-link-lib=gcc_s");
} else if target.contains("openbsd") {
if target.contains("sparc64") {
println!("cargo:rustc-link-lib=gcc");
} else {
println!("cargo:rustc-link-lib=c++abi");
}
} else if target.contains("solaris") {
println!("cargo:rustc-link-lib=gcc_s");
} else if target.contains("dragonfly") {
println!("cargo:rustc-link-lib=gcc_pic");
} else if target.contains("pc-windows-gnu") {
println!("cargo:rustc-link-lib=static-nobundle=gcc_eh");
println!("cargo:rustc-link-lib=static-nobundle=pthread");
} else if target.contains("uwp-windows-gnu") {
println!("cargo:rustc-link-lib=unwind");
} else if target.contains("fuchsia") {
println!("cargo:rustc-link-lib=unwind");
} else if target.contains("haiku") {
println!("cargo:rustc-link-lib=gcc_s");
} else if target.contains("redox") {
// redox is handled in lib.rs
} else if target.contains("cloudabi") {
println!("cargo:rustc-link-lib=unwind");
}
}
mod llvm_libunwind {
use std::env;
use std::path::Path;
/// Compile the libunwind C/C++ source code.
pub fn compile() {
let target_env = env::var("CARGO_CFG_TARGET_ENV").unwrap();
let target_vendor = env::var("CARGO_CFG_TARGET_VENDOR").unwrap();
let target_endian_little = env::var("CARGO_CFG_TARGET_ENDIAN").unwrap() != "big";
let cfg = &mut cc::Build::new();
cfg.cpp(true);
cfg.cpp_set_stdlib(None);
cfg.warnings(false);
// libunwind expects a __LITTLE_ENDIAN__ macro to be set for LE archs, cf. #65765
if target_endian_little {
cfg.define("__LITTLE_ENDIAN__", Some("1"));
}
if target_env == "msvc" {
// Don't pull in extra libraries on MSVC
cfg.flag("/Zl");
cfg.flag("/EHsc");
cfg.define("_CRT_SECURE_NO_WARNINGS", None);
cfg.define("_LIBUNWIND_DISABLE_VISIBILITY_ANNOTATIONS", None);
} else {
cfg.flag("-std=c99");
cfg.flag("-std=c++11");
cfg.flag("-nostdinc++");
cfg.flag("-fno-exceptions");
cfg.flag("-fno-rtti");
cfg.flag("-fstrict-aliasing");
cfg.flag("-funwind-tables");
}
let mut unwind_sources = vec![
"Unwind-EHABI.cpp",
"Unwind-seh.cpp",
"Unwind-sjlj.c",
"UnwindLevel1-gcc-ext.c",
"UnwindLevel1.c",
"UnwindRegistersRestore.S",
"UnwindRegistersSave.S",
"libunwind.cpp",
];
if target_vendor == "apple" {
unwind_sources.push("Unwind_AppleExtras.cpp");
}
let root = Path::new("../llvm-project/libunwind");
cfg.include(root.join("include"));
for src in unwind_sources {
cfg.file(root.join("src").join(src));
}
if target_env == "musl" {
// use the same C compiler command to compile C++ code so we do not need to setup the
// C++ compiler env variables on the builders
cfg.cpp(false);
// linking for musl is handled in lib.rs
cfg.cargo_metadata(false);
println!("cargo:rustc-link-search=native={}", env::var("OUT_DIR").unwrap());
}
cfg.compile("unwind");
}
}
|
