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         // This is handled in the target spec with late_link_args_[static|dynamic]
  37
  38         // cfg!(bootstrap) doesn't work in build scripts
  39         if env::var("RUSTC_STAGE").ok() == Some("0".to_string()) {
  40             println!("cargo:rustc-link-lib=static-nobundle=gcc_eh");
  41             println!("cargo:rustc-link-lib=static-nobundle=pthread");
  42         }
  43     } else if target.contains("uwp-windows-gnu") {
  44         println!("cargo:rustc-link-lib=unwind");
  45     } else if target.contains("fuchsia") {
  46         println!("cargo:rustc-link-lib=unwind");
  47     } else if target.contains("haiku") {
  48         println!("cargo:rustc-link-lib=gcc_s");
  49     } else if target.contains("redox") {
  50         // redox is handled in lib.rs
  51     } else if target.contains("cloudabi") {
  52         println!("cargo:rustc-link-lib=unwind");
  53     }
  54 }
  55
  56 mod llvm_libunwind {
  57     use std::env;
  58     use std::path::Path;
  59
  60     /// Compile the libunwind C/C++ source code.
  61     pub fn compile() {
  62         let target_env = env::var("CARGO_CFG_TARGET_ENV").unwrap();
  63         let target_vendor = env::var("CARGO_CFG_TARGET_VENDOR").unwrap();
  64         let target_endian_little = env::var("CARGO_CFG_TARGET_ENDIAN").unwrap() != "big";
  65         let cfg = &mut cc::Build::new();
  66
  67         cfg.cpp(true);
  68         cfg.cpp_set_stdlib(None);
  69         cfg.warnings(false);
  70
  71         // libunwind expects a __LITTLE_ENDIAN__ macro to be set for LE archs, cf. #65765
  72         if target_endian_little {
  73             cfg.define("__LITTLE_ENDIAN__", Some("1"));
  74         }
  75
  76         if target_env == "msvc" {
  77             // Don't pull in extra libraries on MSVC
  78             cfg.flag("/Zl");
  79             cfg.flag("/EHsc");
  80             cfg.define("_CRT_SECURE_NO_WARNINGS", None);
  81             cfg.define("_LIBUNWIND_DISABLE_VISIBILITY_ANNOTATIONS", None);
  82         } else {
  83             cfg.flag("-std=c99");
  84             cfg.flag("-std=c++11");
  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         }
  91
  92         let mut unwind_sources = vec![
  93             "Unwind-EHABI.cpp",
  94             "Unwind-seh.cpp",
  95             "Unwind-sjlj.c",
  96             "UnwindLevel1-gcc-ext.c",
  97             "UnwindLevel1.c",
  98             "UnwindRegistersRestore.S",
  99             "UnwindRegistersSave.S",
 100             "libunwind.cpp",
 101         ];
 102
 103         if target_vendor == "apple" {
 104             unwind_sources.push("Unwind_AppleExtras.cpp");
 105         }
 106
 107         let root = Path::new("../llvm-project/libunwind");
 108         cfg.include(root.join("include"));
 109         for src in unwind_sources {
 110             cfg.file(root.join("src").join(src));
 111         }
 112
 113         if target_env == "musl" {
 114             // use the same C compiler command to compile C++ code so we do not need to setup the
 115             // C++ compiler env variables on the builders
 116             cfg.cpp(false);
 117             // linking for musl is handled in lib.rs
 118             cfg.cargo_metadata(false);
 119             println!("cargo:rustc-link-search=native={}", env::var("OUT_DIR").unwrap());
 120         }
 121
 122         cfg.compile("unwind");
 123     }
 124 }