183 lines
8.2 KiB
Rust
183 lines
8.2 KiB
Rust
use std::env;
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fn main() {
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println!("cargo:rerun-if-changed=build.rs");
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let target_arch = env::var("CARGO_CFG_TARGET_ARCH").expect("CARGO_CFG_TARGET_ARCH was not set");
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let target_os = env::var("CARGO_CFG_TARGET_OS").expect("CARGO_CFG_TARGET_OS was not set");
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let target_vendor =
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env::var("CARGO_CFG_TARGET_VENDOR").expect("CARGO_CFG_TARGET_VENDOR was not set");
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let target_env = env::var("CARGO_CFG_TARGET_ENV").expect("CARGO_CFG_TARGET_ENV was not set");
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let target_abi = env::var("CARGO_CFG_TARGET_ABI").expect("CARGO_CFG_TARGET_ABI was not set");
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let target_pointer_width: u32 = env::var("CARGO_CFG_TARGET_POINTER_WIDTH")
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.expect("CARGO_CFG_TARGET_POINTER_WIDTH was not set")
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.parse()
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.unwrap();
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let is_miri = env::var_os("CARGO_CFG_MIRI").is_some();
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println!("cargo:rustc-check-cfg=cfg(netbsd10)");
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if target_os == "netbsd" && env::var("RUSTC_STD_NETBSD10").is_ok() {
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println!("cargo:rustc-cfg=netbsd10");
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}
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println!("cargo:rustc-check-cfg=cfg(restricted_std)");
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if target_os == "linux"
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|| target_os == "android"
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|| target_os == "netbsd"
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|| target_os == "dragonfly"
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|| target_os == "openbsd"
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|| target_os == "freebsd"
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|| target_os == "solaris"
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|| target_os == "illumos"
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|| target_os == "macos"
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|| target_os == "ios"
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|| target_os == "tvos"
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|| target_os == "watchos"
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|| target_os == "visionos"
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|| target_os == "windows"
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|| target_os == "fuchsia"
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|| (target_vendor == "fortanix" && target_env == "sgx")
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|| target_os == "hermit"
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|| target_os == "l4re"
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|| target_os == "redox"
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|| target_os == "haiku"
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|| target_os == "vxworks"
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|| target_arch == "wasm32"
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|| target_arch == "wasm64"
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|| target_os == "espidf"
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|| target_os.starts_with("solid")
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|| (target_vendor == "nintendo" && target_env == "newlib")
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|| target_os == "vita"
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|| target_os == "aix"
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|| target_os == "nto"
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|| target_os == "xous"
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|| target_os == "hurd"
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|| target_os == "uefi"
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|| target_os == "teeos"
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|| target_os == "zkvm"
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|| target_os == "rtems"
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|| target_os == "nuttx"
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// See src/bootstrap/src/core/build_steps/synthetic_targets.rs
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|| env::var("RUSTC_BOOTSTRAP_SYNTHETIC_TARGET").is_ok()
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{
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// These platforms don't have any special requirements.
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} else {
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// This is for Cargo's build-std support, to mark std as unstable for
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// typically no_std platforms.
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// This covers:
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// - os=none ("bare metal" targets)
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// - mipsel-sony-psp
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// - nvptx64-nvidia-cuda
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// - arch=avr
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// - JSON targets
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// - Any new targets that have not been explicitly added above.
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println!("cargo:rustc-cfg=restricted_std");
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}
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println!("cargo:rustc-check-cfg=cfg(backtrace_in_libstd)");
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println!("cargo:rustc-cfg=backtrace_in_libstd");
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println!("cargo:rustc-env=STD_ENV_ARCH={}", env::var("CARGO_CFG_TARGET_ARCH").unwrap());
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// Emit these on platforms that have no known ABI bugs, LLVM selection bugs, lowering bugs,
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// missing symbols, or other problems, to determine when tests get run.
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// If more broken platforms are found, please update the tracking issue at
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// <https://github.com/rust-lang/rust/issues/116909>
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//
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// Some of these match arms are redundant; the goal is to separate reasons that the type is
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// unreliable, even when multiple reasons might fail the same platform.
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println!("cargo:rustc-check-cfg=cfg(reliable_f16)");
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println!("cargo:rustc-check-cfg=cfg(reliable_f128)");
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// This is a step beyond only having the types and basic functions available. Math functions
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// aren't consistently available or correct.
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println!("cargo:rustc-check-cfg=cfg(reliable_f16_math)");
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println!("cargo:rustc-check-cfg=cfg(reliable_f128_math)");
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let has_reliable_f16 = match (target_arch.as_str(), target_os.as_str()) {
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// We can always enable these in Miri as that is not affected by codegen bugs.
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_ if is_miri => true,
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// Selection failure <https://github.com/llvm/llvm-project/issues/50374>
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("s390x", _) => false,
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// Unsupported <https://github.com/llvm/llvm-project/issues/94434>
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("arm64ec", _) => false,
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// MinGW ABI bugs <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115054>
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("x86_64", "windows") if target_env == "gnu" && target_abi != "llvm" => false,
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// Infinite recursion <https://github.com/llvm/llvm-project/issues/97981>
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("csky", _) => false,
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("hexagon", _) => false,
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("loongarch64", _) => false,
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("mips" | "mips64" | "mips32r6" | "mips64r6", _) => false,
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("powerpc" | "powerpc64", _) => false,
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("sparc" | "sparc64", _) => false,
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("wasm32" | "wasm64", _) => false,
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// `f16` support only requires that symbols converting to and from `f32` are available. We
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// provide these in `compiler-builtins`, so `f16` should be available on all platforms that
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// do not have other ABI issues or LLVM crashes.
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_ => true,
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};
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let has_reliable_f128 = match (target_arch.as_str(), target_os.as_str()) {
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// We can always enable these in Miri as that is not affected by codegen bugs.
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_ if is_miri => true,
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// Unsupported <https://github.com/llvm/llvm-project/issues/94434>
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("arm64ec", _) => false,
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// ABI and precision bugs <https://github.com/rust-lang/rust/issues/125109>
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// <https://github.com/rust-lang/rust/issues/125102>
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("powerpc" | "powerpc64", _) => false,
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// Selection bug <https://github.com/llvm/llvm-project/issues/95471>
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("nvptx64", _) => false,
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// ABI unsupported <https://github.com/llvm/llvm-project/issues/41838>
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("sparc", _) => false,
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// MinGW ABI bugs <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115054>
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("x86_64", "windows") if target_env == "gnu" && target_abi != "llvm" => false,
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// 64-bit Linux is about the only platform to have f128 symbols by default
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(_, "linux") if target_pointer_width == 64 => true,
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// Almost all OSs are missing symbol. compiler-builtins will have to add them.
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_ => false,
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};
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// Configure platforms that have reliable basics but may have unreliable math.
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// LLVM is currently adding missing routines, <https://github.com/llvm/llvm-project/issues/93566>
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let has_reliable_f16_math = has_reliable_f16
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&& match (target_arch.as_str(), target_os.as_str()) {
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// FIXME: Disabled on Miri as the intrinsics are not implemented yet.
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_ if is_miri => false,
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// x86 has a crash for `powi`: <https://github.com/llvm/llvm-project/issues/105747>
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("x86" | "x86_64", _) => false,
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// Assume that working `f16` means working `f16` math for most platforms, since
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// operations just go through `f32`.
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_ => true,
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};
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let has_reliable_f128_math = has_reliable_f128
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&& match (target_arch.as_str(), target_os.as_str()) {
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// FIXME: Disabled on Miri as the intrinsics are not implemented yet.
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_ if is_miri => false,
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// LLVM lowers `fp128` math to `long double` symbols even on platforms where
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// `long double` is not IEEE binary128. See
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// <https://github.com/llvm/llvm-project/issues/44744>.
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//
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// This rules out anything that doesn't have `long double` = `binary128`; <= 32 bits
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// (ld is `f64`), anything other than Linux (Windows and MacOS use `f64`), and `x86`
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// (ld is 80-bit extended precision).
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("x86_64", _) => false,
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(_, "linux") if target_pointer_width == 64 => true,
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_ => false,
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};
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if has_reliable_f16 {
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println!("cargo:rustc-cfg=reliable_f16");
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}
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if has_reliable_f128 {
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println!("cargo:rustc-cfg=reliable_f128");
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}
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if has_reliable_f16_math {
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println!("cargo:rustc-cfg=reliable_f16_math");
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}
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if has_reliable_f128_math {
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println!("cargo:rustc-cfg=reliable_f128_math");
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}
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}
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