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 = "system-llvm-libunwind") {
   8         return;
   9     }
  10
  11     if cfg!(feature = "llvm-libunwind")
  12         && ((target.contains("linux") && !target.contains("musl")) || target.contains("fuchsia"))
  13     {
  14         // Build the unwinding from libunwind C/C++ source code.
  15         llvm_libunwind::compile();
  16     } else if target.contains("x86_64-fortanix-unknown-sgx") {
  17         llvm_libunwind::compile();
  18     } else if target.contains("linux") {
  19         // linking for Linux is handled in lib.rs
  20         if target.contains("musl") {
  21             llvm_libunwind::compile();
  22         }
  23     } else if target.contains("freebsd") {
  24         println!("cargo:rustc-link-lib=gcc_s");
  25     } else if target.contains("netbsd") {
  26         println!("cargo:rustc-link-lib=gcc_s");
  27     } else if target.contains("openbsd") {
  28         if target.contains("sparc64") {
  29             println!("cargo:rustc-link-lib=gcc");
  30         } else {
  31             println!("cargo:rustc-link-lib=c++abi");
  32         }
  33     } else if target.contains("solaris") {
  34         println!("cargo:rustc-link-lib=gcc_s");
  35     } else if target.contains("illumos") {
  36         println!("cargo:rustc-link-lib=gcc_s");
  37     } else if target.contains("dragonfly") {
  38         println!("cargo:rustc-link-lib=gcc_pic");
  39     } else if target.contains("pc-windows-gnu") {
  40         // This is handled in the target spec with late_link_args_[static|dynamic]
  41     } else if target.contains("uwp-windows-gnu") {
  42         println!("cargo:rustc-link-lib=unwind");
  43     } else if target.contains("fuchsia") {
  44         println!("cargo:rustc-link-lib=unwind");
  45     } else if target.contains("haiku") {
  46         println!("cargo:rustc-link-lib=gcc_s");
  47     } else if target.contains("redox") {
  48         // redox is handled in lib.rs
  49     }
  50 }
  51
  52 mod llvm_libunwind {
  53     use std::env;
  54     use std::path::Path;
  55
  56     /// Compile the libunwind C/C++ source code.
  57     pub fn compile() {
  58         let target = env::var("TARGET").expect("TARGET was not set");
  59         let target_env = env::var("CARGO_CFG_TARGET_ENV").unwrap();
  60         let target_vendor = env::var("CARGO_CFG_TARGET_VENDOR").unwrap();
  61         let target_endian_little = env::var("CARGO_CFG_TARGET_ENDIAN").unwrap() != "big";
  62         let cfg = &mut cc::Build::new();
  63
  64         cfg.cpp(true);
  65         cfg.cpp_set_stdlib(None);
  66         cfg.warnings(false);
  67
  68         // libunwind expects a __LITTLE_ENDIAN__ macro to be set for LE archs, cf. #65765
  69         if target_endian_little {
  70             cfg.define("__LITTLE_ENDIAN__", Some("1"));
  71         }
  72
  73         if target_env == "msvc" {
  74             // Don't pull in extra libraries on MSVC
  75             cfg.flag("/Zl");
  76             cfg.flag("/EHsc");
  77             cfg.define("_CRT_SECURE_NO_WARNINGS", None);
  78             cfg.define("_LIBUNWIND_DISABLE_VISIBILITY_ANNOTATIONS", None);
  79         } else if target.contains("x86_64-fortanix-unknown-sgx") {
  80             cfg.cpp(false);
  81
  82             cfg.static_flag(true);
  83             cfg.opt_level(3);
  84
  85             cfg.flag("-nostdinc++");
  86             cfg.flag("-fno-exceptions");
  87             cfg.flag("-fno-rtti");
  88             cfg.flag("-fstrict-aliasing");
  89             cfg.flag("-funwind-tables");
  90             cfg.flag("-fvisibility=hidden");
  91             cfg.flag("-fno-stack-protector");
  92             cfg.flag("-ffreestanding");
  93             cfg.flag("-fexceptions");
  94
  95             // easiest way to undefine since no API available in cc::Build to undefine
  96             cfg.flag("-U_FORTIFY_SOURCE");
  97             cfg.define("_FORTIFY_SOURCE", "0");
  98
  99             cfg.flag_if_supported("-fvisibility-global-new-delete-hidden");
 100
 101             cfg.define("_LIBUNWIND_DISABLE_VISIBILITY_ANNOTATIONS", None);
 102             cfg.define("RUST_SGX", "1");
 103             cfg.define("__NO_STRING_INLINES", None);
 104             cfg.define("__NO_MATH_INLINES", None);
 105             cfg.define("_LIBUNWIND_IS_BAREMETAL", None);
 106             cfg.define("__LIBUNWIND_IS_NATIVE_ONLY", None);
 107             cfg.define("NDEBUG", None);
 108         } else {
 109             cfg.flag("-std=c99");
 110             cfg.flag("-std=c++11");
 111             cfg.flag("-nostdinc++");
 112             cfg.flag("-fno-exceptions");
 113             cfg.flag("-fno-rtti");
 114             cfg.flag("-fstrict-aliasing");
 115             cfg.flag("-funwind-tables");
 116             cfg.flag("-fvisibility=hidden");
 117             cfg.flag_if_supported("-fvisibility-global-new-delete-hidden");
 118             cfg.define("_LIBUNWIND_DISABLE_VISIBILITY_ANNOTATIONS", None);
 119         }
 120
 121         let mut unwind_sources = vec![
 122             "Unwind-EHABI.cpp",
 123             "Unwind-seh.cpp",
 124             "Unwind-sjlj.c",
 125             "UnwindLevel1-gcc-ext.c",
 126             "UnwindLevel1.c",
 127             "UnwindRegistersRestore.S",
 128             "UnwindRegistersSave.S",
 129             "libunwind.cpp",
 130         ];
 131
 132         if target_vendor == "apple" {
 133             unwind_sources.push("Unwind_AppleExtras.cpp");
 134         }
 135
 136         if target.contains("x86_64-fortanix-unknown-sgx") {
 137             unwind_sources.push("UnwindRustSgx.c");
 138         }
 139
 140         let root = Path::new("../../src/llvm-project/libunwind");
 141         cfg.include(root.join("include"));
 142         for src in unwind_sources {
 143             cfg.file(root.join("src").join(src));
 144         }
 145
 146         if target_env == "musl" {
 147             // use the same C compiler command to compile C++ code so we do not need to setup the
 148             // C++ compiler env variables on the builders
 149             cfg.cpp(false);
 150             // linking for musl is handled in lib.rs
 151             cfg.cargo_metadata(false);
 152             println!("cargo:rustc-link-search=native={}", env::var("OUT_DIR").unwrap());
 153         }
 154
 155         cfg.compile("unwind");
 156     }
 157 }