library/std/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     if target.contains("freebsd") {
   7         if env::var("RUST_STD_FREEBSD_12_ABI").is_ok() {
   8             println!("cargo:rustc-cfg=freebsd12");
   9         }
  10     } else if target.contains("linux")
  11         || target.contains("netbsd")
  12         || target.contains("dragonfly")
  13         || target.contains("openbsd")
  14         || target.contains("solaris")
  15         || target.contains("illumos")
  16         || target.contains("apple-darwin")
  17         || target.contains("apple-ios")
  18         || target.contains("apple-watchos")
  19         || target.contains("uwp")
  20         || target.contains("windows")
  21         || target.contains("fuchsia")
  22         || (target.contains("sgx") && target.contains("fortanix"))
  23         || target.contains("hermit")
  24         || target.contains("l4re")
  25         || target.contains("redox")
  26         || target.contains("haiku")
  27         || target.contains("vxworks")
  28         || target.contains("wasm32")
  29         || target.contains("wasm64")
  30         || target.contains("asmjs")
  31         || target.contains("espidf")
  32         || target.contains("solid")
  33         || target.contains("nintendo-3ds")
  34     {
  35         // These platforms don't have any special requirements.
  36     } else {
  37         // This is for Cargo's build-std support, to mark std as unstable for
  38         // typically no_std platforms.
  39         // This covers:
  40         // - os=none ("bare metal" targets)
  41         // - mipsel-sony-psp
  42         // - nvptx64-nvidia-cuda
  43         // - arch=avr
  44         // - tvos (aarch64-apple-tvos, x86_64-apple-tvos)
  45         // - uefi (x86_64-unknown-uefi, i686-unknown-uefi)
  46         // - JSON targets
  47         // - Any new targets that have not been explicitly added above.
  48         println!("cargo:rustc-cfg=feature=\"restricted-std\"");
  49     }
  50     println!("cargo:rustc-env=STD_ENV_ARCH={}", env::var("CARGO_CFG_TARGET_ARCH").unwrap());
  51     println!("cargo:rustc-cfg=backtrace_in_libstd");
  52 }