library/unwind/build.rs

   1 use std::env;
   2
   3 fn main() {
   4     println!("cargo:rerun-if-changed=build.rs");
   5     let target = env::var("TARGET").expect("TARGET was not set");
   6
   7     if cfg!(feature = "llvm-libunwind")
   8         && ((target.contains("linux") && !target.contains("musl")) || target.contains("fuchsia"))
   9     {
  10         // Build the unwinding from libunwind C/C++ source code.
  11         llvm_libunwind::compile();
  12     } else if target.contains("x86_64-fortanix-unknown-sgx") {
  13         llvm_libunwind::compile();
  14     } else if target.contains("linux") {
  15         // linking for Linux is handled in lib.rs
  16         if target.contains("musl") {
  17             llvm_libunwind::compile();
  18         }
  19     } else if target.contains("freebsd") {
  20         println!("cargo:rustc-link-lib=gcc_s");
  21     } else if target.contains("rumprun") {
  22         println!("cargo:rustc-link-lib=unwind");
  23     } else if target.contains("netbsd") {
  24         println!("cargo:rustc-link-lib=gcc_s");
  25     } else if target.contains("openbsd") {
  26         if target.contains("sparc64") {
  27             println!("cargo:rustc-link-lib=gcc");
  28         } else {
  29             println!("cargo:rustc-link-lib=c++abi");
  30         }
  31     } else if target.contains("solaris") {
  32         println!("cargo:rustc-link-lib=gcc_s");
  33     } else if target.contains("illumos") {
  34         println!("cargo:rustc-link-lib=gcc_s");
  35     } else if target.contains("dragonfly") {
  36         println!("cargo:rustc-link-lib=gcc_pic");
  37     } else if target.contains("pc-windows-gnu") {
  38         // This is handled in the target spec with late_link_args_[static|dynamic]
  39     } else if target.contains("uwp-windows-gnu") {
  40         println!("cargo:rustc-link-lib=unwind");
  41     } else if target.contains("fuchsia") {
  42         println!("cargo:rustc-link-lib=unwind");
  43     } else if target.contains("haiku") {
  44         println!("cargo:rustc-link-lib=gcc_s");
  45     } else if target.contains("redox") {
  46         // redox is handled in lib.rs
  47     }
  48 }
  49
  50 mod llvm_libunwind {
  51     use std::env;
  52     use std::path::Path;
  53
  54     /// Compile the libunwind C/C++ source code.
  55     pub fn compile() {
  56         let target = env::var("TARGET").expect("TARGET was not set");
  57         let target_env = env::var("CARGO_CFG_TARGET_ENV").unwrap();
  58         let target_vendor = env::var("CARGO_CFG_TARGET_VENDOR").unwrap();
  59         let target_endian_little = env::var("CARGO_CFG_TARGET_ENDIAN").unwrap() != "big";
  60         let cfg = &mut cc::Build::new();
  61
  62         cfg.cpp(true);
  63         cfg.cpp_set_stdlib(None);
  64         cfg.warnings(false);
  65
  66         // libunwind expects a __LITTLE_ENDIAN__ macro to be set for LE archs, cf. #65765
  67         if target_endian_little {
  68             cfg.define("__LITTLE_ENDIAN__", Some("1"));
  69         }
  70
  71         if target_env == "msvc" {
  72             // Don't pull in extra libraries on MSVC
  73             cfg.flag("/Zl");
  74             cfg.flag("/EHsc");
  75             cfg.define("_CRT_SECURE_NO_WARNINGS", None);
  76             cfg.define("_LIBUNWIND_DISABLE_VISIBILITY_ANNOTATIONS", None);
  77         } else if target.contains("x86_64-fortanix-unknown-sgx") {
  78             cfg.cpp(false);
  79
  80             cfg.static_flag(true);
  81             cfg.opt_level(3);
  82
  83             cfg.flag("-nostdinc++");
  84             cfg.flag("-fno-exceptions");
  85             cfg.flag("-fno-rtti");
  86             cfg.flag("-fstrict-aliasing");
  87             cfg.flag("-funwind-tables");
  88             cfg.flag("-fvisibility=hidden");
  89             cfg.flag("-fno-stack-protector");
  90             cfg.flag("-ffreestanding");
  91             cfg.flag("-fexceptions");
  92
  93             // easiest way to undefine since no API available in cc::Build to undefine
  94             cfg.flag("-U_FORTIFY_SOURCE");
  95             cfg.define("_FORTIFY_SOURCE", "0");
  96
  97             cfg.flag_if_supported("-fvisibility-global-new-delete-hidden");
  98
  99             cfg.define("_LIBUNWIND_DISABLE_VISIBILITY_ANNOTATIONS", None);
 100             cfg.define("RUST_SGX", "1");
 101             cfg.define("__NO_STRING_INLINES", None);
 102             cfg.define("__NO_MATH_INLINES", None);
 103             cfg.define("_LIBUNWIND_IS_BAREMETAL", None);
 104             cfg.define("__LIBUNWIND_IS_NATIVE_ONLY", None);
 105             cfg.define("NDEBUG", None);
 106         } else {
 107             cfg.flag("-std=c99");
 108             cfg.flag("-std=c++11");
 109             cfg.flag("-nostdinc++");
 110             cfg.flag("-fno-exceptions");
 111             cfg.flag("-fno-rtti");
 112             cfg.flag("-fstrict-aliasing");
 113             cfg.flag("-funwind-tables");
 114             cfg.flag("-fvisibility=hidden");
 115             cfg.flag_if_supported("-fvisibility-global-new-delete-hidden");
 116             cfg.define("_LIBUNWIND_DISABLE_VISIBILITY_ANNOTATIONS", None);
 117         }
 118
 119         let mut unwind_sources = vec![
 120             "Unwind-EHABI.cpp",
 121             "Unwind-seh.cpp",
 122             "Unwind-sjlj.c",
 123             "UnwindLevel1-gcc-ext.c",
 124             "UnwindLevel1.c",
 125             "UnwindRegistersRestore.S",
 126             "UnwindRegistersSave.S",
 127             "libunwind.cpp",
 128         ];
 129
 130         if target_vendor == "apple" {
 131             unwind_sources.push("Unwind_AppleExtras.cpp");
 132         }
 133
 134         if target.contains("x86_64-fortanix-unknown-sgx") {
 135             unwind_sources.push("UnwindRustSgx.c");
 136         }
 137
 138         let root = Path::new("../../src/llvm-project/libunwind");
 139         cfg.include(root.join("include"));
 140         for src in unwind_sources {
 141             cfg.file(root.join("src").join(src));
 142         }
 143
 144         if target_env == "musl" {
 145             // use the same C compiler command to compile C++ code so we do not need to setup the
 146             // C++ compiler env variables on the builders
 147             cfg.cpp(false);
 148             // linking for musl is handled in lib.rs
 149             cfg.cargo_metadata(false);
 150             println!("cargo:rustc-link-search=native={}", env::var("OUT_DIR").unwrap());
 151         }
 152
 153         cfg.compile("unwind");
 154     }
 155 }