src/libunwind/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("linux") {
  13         if target.contains("musl") {
  14             // linking for musl is handled in lib.rs
  15             llvm_libunwind::compile();
  16         } else if !target.contains("android") {
  17             println!("cargo:rustc-link-lib=gcc_s");
  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("dragonfly") {
  34         println!("cargo:rustc-link-lib=gcc_pic");
  35     } else if target.contains("pc-windows-gnu") {
  36         println!("cargo:rustc-link-lib=static-nobundle=gcc_eh");
  37         println!("cargo:rustc-link-lib=static-nobundle=pthread");
  38     } else if target.contains("uwp-windows-gnu") {
  39         println!("cargo:rustc-link-lib=unwind");
  40     } else if target.contains("fuchsia") {
  41         println!("cargo:rustc-link-lib=unwind");
  42     } else if target.contains("haiku") {
  43         println!("cargo:rustc-link-lib=gcc_s");
  44     } else if target.contains("redox") {
  45         // redox is handled in lib.rs
  46     } else if target.contains("cloudabi") {
  47         println!("cargo:rustc-link-lib=unwind");
  48     }
  49 }
  50
  51 mod llvm_libunwind {
  52     use std::env;
  53     use std::path::Path;
  54
  55     /// Compile the libunwind C/C++ source code.
  56     pub fn compile() {
  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 {
  78             cfg.flag("-std=c99");
  79             cfg.flag("-std=c++11");
  80             cfg.flag("-nostdinc++");
  81             cfg.flag("-fno-exceptions");
  82             cfg.flag("-fno-rtti");
  83             cfg.flag("-fstrict-aliasing");
  84             cfg.flag("-funwind-tables");
  85         }
  86
  87         let mut unwind_sources = vec![
  88             "Unwind-EHABI.cpp",
  89             "Unwind-seh.cpp",
  90             "Unwind-sjlj.c",
  91             "UnwindLevel1-gcc-ext.c",
  92             "UnwindLevel1.c",
  93             "UnwindRegistersRestore.S",
  94             "UnwindRegistersSave.S",
  95             "libunwind.cpp",
  96         ];
  97
  98         if target_vendor == "apple" {
  99             unwind_sources.push("Unwind_AppleExtras.cpp");
 100         }
 101
 102         let root = Path::new("../llvm-project/libunwind");
 103         cfg.include(root.join("include"));
 104         for src in unwind_sources {
 105             cfg.file(root.join("src").join(src));
 106         }
 107
 108         if target_env == "musl" {
 109             // use the same C compiler command to compile C++ code so we do not need to setup the
 110             // C++ compiler env variables on the builders
 111             cfg.cpp(false);
 112             // linking for musl is handled in lib.rs
 113             cfg.cargo_metadata(false);
 114             println!("cargo:rustc-link-search=native={}", env::var("OUT_DIR").unwrap());
 115         }
 116
 117         cfg.compile("unwind");
 118     }
 119 }