use std::env; fn main() { println!("cargo:rerun-if-changed=build.rs"); let target = env::var("TARGET").expect("TARGET was not set"); if target.contains("freebsd") { if env::var("RUST_STD_FREEBSD_12_ABI").is_ok() { println!("cargo:rustc-cfg=freebsd12"); } } else if target.contains("linux") || target.contains("netbsd") || target.contains("dragonfly") || target.contains("openbsd") || target.contains("solaris") || target.contains("illumos") || target.contains("apple-darwin") || target.contains("apple-ios") || target.contains("uwp") || target.contains("windows") || target.contains("fuchsia") || (target.contains("sgx") && target.contains("fortanix")) || target.contains("hermit") || target.contains("l4re") || target.contains("redox") || target.contains("haiku") || target.contains("vxworks") || target.contains("wasm32") || target.contains("asmjs") || target.contains("espidf") || target.contains("solid") { // These platforms don't have any special requirements. } else { // This is for Cargo's build-std support, to mark std as unstable for // typically no_std platforms. // This covers: // - os=none ("bare metal" targets) // - mipsel-sony-psp // - nvptx64-nvidia-cuda // - arch=avr // - tvos (aarch64-apple-tvos, x86_64-apple-tvos) // - uefi (x86_64-unknown-uefi, i686-unknown-uefi) // - JSON targets // - Any new targets that have not been explicitly added above. println!("cargo:rustc-cfg=feature=\"restricted-std\""); } println!("cargo:rustc-env=STD_ENV_ARCH={}", env::var("CARGO_CFG_TARGET_ARCH").unwrap()); println!("cargo:rustc-cfg=backtrace_in_libstd"); }