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("x86_64-fortanix-unknown-sgx") { llvm_libunwind::compile(); } else if target.contains("linux") { // linking for Linux is handled in lib.rs if target.contains("musl") { llvm_libunwind::compile(); } } 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("illumos") { 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") { // This is handled in the target spec with late_link_args_[static|dynamic] } 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 } } mod llvm_libunwind { use std::env; use std::path::Path; /// Compile the libunwind C/C++ source code. pub fn compile() { let target = env::var("TARGET").expect("TARGET was not set"); 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 if target.contains("x86_64-fortanix-unknown-sgx") { cfg.cpp(false); cfg.static_flag(true); cfg.opt_level(3); cfg.flag("-nostdinc++"); cfg.flag("-fno-exceptions"); cfg.flag("-fno-rtti"); cfg.flag("-fstrict-aliasing"); cfg.flag("-funwind-tables"); cfg.flag("-fvisibility=hidden"); cfg.flag("-fno-stack-protector"); cfg.flag("-ffreestanding"); cfg.flag("-fexceptions"); // easiest way to undefine since no API available in cc::Build to undefine cfg.flag("-U_FORTIFY_SOURCE"); cfg.define("_FORTIFY_SOURCE", "0"); cfg.flag_if_supported("-fvisibility-global-new-delete-hidden"); cfg.define("_LIBUNWIND_DISABLE_VISIBILITY_ANNOTATIONS", None); cfg.define("RUST_SGX", "1"); cfg.define("__NO_STRING_INLINES", None); cfg.define("__NO_MATH_INLINES", None); cfg.define("_LIBUNWIND_IS_BAREMETAL", None); cfg.define("__LIBUNWIND_IS_NATIVE_ONLY", None); cfg.define("NDEBUG", 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"); cfg.flag("-fvisibility=hidden"); cfg.flag_if_supported("-fvisibility-global-new-delete-hidden"); cfg.define("_LIBUNWIND_DISABLE_VISIBILITY_ANNOTATIONS", None); } 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"); } if target.contains("x86_64-fortanix-unknown-sgx") { unwind_sources.push("UnwindRustSgx.c"); } let root = Path::new("../../src/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"); } }