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") ||
   9          target.contains("fuchsia")) {
  10         // Build the unwinding from libunwind C/C++ source code.
  11         #[cfg(feature = "llvm-libunwind")]
  12         llvm_libunwind::compile();
  13     } else if target.contains("linux") {
  14         if target.contains("musl") {
  15             // musl is handled in lib.rs
  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         println!("cargo:rustc-link-lib=c++abi");
  27     } else if target.contains("solaris") {
  28         println!("cargo:rustc-link-lib=gcc_s");
  29     } else if target.contains("bitrig") {
  30         println!("cargo:rustc-link-lib=c++abi");
  31     } else if target.contains("dragonfly") {
  32         println!("cargo:rustc-link-lib=gcc_pic");
  33     } else if target.contains("windows-gnu") {
  34         println!("cargo:rustc-link-lib=static-nobundle=gcc_eh");
  35         println!("cargo:rustc-link-lib=static-nobundle=pthread");
  36     } else if target.contains("fuchsia") {
  37         println!("cargo:rustc-link-lib=unwind");
  38     } else if target.contains("haiku") {
  39         println!("cargo:rustc-link-lib=gcc_s");
  40     } else if target.contains("redox") {
  41         println!("cargo:rustc-link-lib=gcc");
  42     } else if target.contains("cloudabi") {
  43         println!("cargo:rustc-link-lib=unwind");
  44     }
  45 }
  46
  47 #[cfg(feature = "llvm-libunwind")]
  48 mod llvm_libunwind {
  49     use std::env;
  50     use std::path::Path;
  51
  52     /// Compile the libunwind C/C++ source code.
  53     pub fn compile() {
  54         let target_env = env::var("CARGO_CFG_TARGET_ENV").unwrap();
  55         let target_vendor = env::var("CARGO_CFG_TARGET_VENDOR").unwrap();
  56         let cfg = &mut cc::Build::new();
  57
  58         cfg.cpp(true);
  59         cfg.cpp_set_stdlib(None);
  60         cfg.warnings(false);
  61
  62         if target_env == "msvc" {
  63             // Don't pull in extra libraries on MSVC
  64             cfg.flag("/Zl");
  65             cfg.flag("/EHsc");
  66             cfg.define("_CRT_SECURE_NO_WARNINGS", None);
  67             cfg.define("_LIBUNWIND_DISABLE_VISIBILITY_ANNOTATIONS", None);
  68         } else {
  69             cfg.flag("-std=c99");
  70             cfg.flag("-std=c++11");
  71             cfg.flag("-nostdinc++");
  72             if cfg.is_flag_supported("-funwind-tables").unwrap_or_default() &&
  73                cfg.is_flag_supported("-fno-exceptions").unwrap_or_default() {
  74                 cfg.flag("-funwind-tables");
  75                 cfg.flag("-fno-exceptions");
  76             }
  77             cfg.flag("-fno-rtti");
  78             cfg.flag("-fstrict-aliasing");
  79         }
  80
  81         let mut unwind_sources = vec![
  82             "Unwind-EHABI.cpp",
  83             "Unwind-seh.cpp",
  84             "Unwind-sjlj.c",
  85             "UnwindLevel1-gcc-ext.c",
  86             "UnwindLevel1.c",
  87             "UnwindRegistersRestore.S",
  88             "UnwindRegistersSave.S",
  89             "libunwind.cpp",
  90         ];
  91
  92         if target_vendor == "apple" {
  93             unwind_sources.push("Unwind_AppleExtras.cpp");
  94         }
  95
  96         let root = Path::new("../llvm-project/libunwind");
  97         cfg.include(root.join("include"));
  98         for src in unwind_sources {
  99             cfg.file(root.join("src").join(src));
 100         }
 101
 102         cfg.compile("unwind");
 103     }
 104 }