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("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     } else if target.contains("cloudabi") {
  48         println!("cargo:rustc-link-lib=unwind");
  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 = env::var("CARGO_CFG_TARGET_ENV").unwrap();
  59         let target_vendor = env::var("CARGO_CFG_TARGET_VENDOR").unwrap();
  60         let target_endian_little = env::var("CARGO_CFG_TARGET_ENDIAN").unwrap() != "big";
  61         let cfg = &mut cc::Build::new();
  62
  63         cfg.cpp(true);
  64         cfg.cpp_set_stdlib(None);
  65         cfg.warnings(false);
  66
  67         // libunwind expects a __LITTLE_ENDIAN__ macro to be set for LE archs, cf. #65765
  68         if target_endian_little {
  69             cfg.define("__LITTLE_ENDIAN__", Some("1"));
  70         }
  71
  72         if target_env == "msvc" {
  73             // Don't pull in extra libraries on MSVC
  74             cfg.flag("/Zl");
  75             cfg.flag("/EHsc");
  76             cfg.define("_CRT_SECURE_NO_WARNINGS", None);
  77             cfg.define("_LIBUNWIND_DISABLE_VISIBILITY_ANNOTATIONS", None);
  78         } else {
  79             cfg.flag("-std=c99");
  80             cfg.flag("-std=c++11");
  81             cfg.flag("-nostdinc++");
  82             cfg.flag("-fno-exceptions");
  83             cfg.flag("-fno-rtti");
  84             cfg.flag("-fstrict-aliasing");
  85             cfg.flag("-funwind-tables");
  86             cfg.flag("-fvisibility=hidden");
  87             cfg.flag_if_supported("-fvisibility-global-new-delete-hidden");
  88             cfg.define("_LIBUNWIND_DISABLE_VISIBILITY_ANNOTATIONS", None);
  89         }
  90
  91         let mut unwind_sources = vec![
  92             "Unwind-EHABI.cpp",
  93             "Unwind-seh.cpp",
  94             "Unwind-sjlj.c",
  95             "UnwindLevel1-gcc-ext.c",
  96             "UnwindLevel1.c",
  97             "UnwindRegistersRestore.S",
  98             "UnwindRegistersSave.S",
  99             "libunwind.cpp",
 100         ];
 101
 102         if target_vendor == "apple" {
 103             unwind_sources.push("Unwind_AppleExtras.cpp");
 104         }
 105
 106         let root = Path::new("../llvm-project/libunwind");
 107         cfg.include(root.join("include"));
 108         for src in unwind_sources {
 109             cfg.file(root.join("src").join(src));
 110         }
 111
 112         if target_env == "musl" {
 113             // use the same C compiler command to compile C++ code so we do not need to setup the
 114             // C++ compiler env variables on the builders
 115             cfg.cpp(false);
 116             // linking for musl is handled in lib.rs
 117             cfg.cargo_metadata(false);
 118             println!("cargo:rustc-link-search=native={}", env::var("OUT_DIR").unwrap());
 119         }
 120
 121         cfg.compile("unwind");
 122     }
 123 }