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87 lines
3.2 KiB
Rust
87 lines
3.2 KiB
Rust
// Configuration that is shared between `compiler_builtins` and `testcrate`.
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use std::env;
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#[allow(dead_code)]
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pub struct Target {
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pub triple: String,
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pub os: String,
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pub arch: String,
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pub vendor: String,
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pub env: String,
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pub pointer_width: u8,
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pub little_endian: bool,
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pub features: Vec<String>,
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}
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impl Target {
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pub fn from_env() -> Self {
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let little_endian = match env::var("CARGO_CFG_TARGET_ENDIAN").unwrap().as_str() {
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"little" => true,
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"big" => false,
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x => panic!("unknown endian {x}"),
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};
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Self {
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triple: env::var("TARGET").unwrap(),
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os: env::var("CARGO_CFG_TARGET_OS").unwrap(),
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arch: env::var("CARGO_CFG_TARGET_ARCH").unwrap(),
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vendor: env::var("CARGO_CFG_TARGET_VENDOR").unwrap(),
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env: env::var("CARGO_CFG_TARGET_ENV").unwrap(),
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pointer_width: env::var("CARGO_CFG_TARGET_POINTER_WIDTH")
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.unwrap()
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.parse()
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.unwrap(),
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little_endian,
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features: env::var("CARGO_CFG_TARGET_FEATURE")
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.unwrap_or_default()
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.split(",")
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.map(ToOwned::to_owned)
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.collect(),
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}
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}
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}
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/// Configure whether or not `f16` and `f128` support should be enabled.
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pub fn configure_f16_f128(target: &Target) {
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// Set whether or not `f16` and `f128` are supported at a basic level by LLVM. This only means
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// that the backend will not crash when using these types. This does not mean that the
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// backend does the right thing, or that the platform doesn't have ABI bugs.
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//
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// We do this here rather than in `rust-lang/rust` because configuring via cargo features is
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// not straightforward.
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//
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// Original source of this list:
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// <https://github.com/rust-lang/compiler-builtins/pull/652#issuecomment-2266151350>
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let (f16_ok, f128_ok) = match target.arch.as_str() {
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// `f16` and `f128` both crash <https://github.com/llvm/llvm-project/issues/94434>
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"arm64ec" => (false, false),
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// `f16` crashes <https://github.com/llvm/llvm-project/issues/50374>
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"s390x" => (false, true),
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// `f128` crashes <https://github.com/llvm/llvm-project/issues/96432>
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"mips64" | "mips64r6" => (true, false),
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// `f128` crashes <https://github.com/llvm/llvm-project/issues/101545>
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"powerpc64" if &target.os == "aix" => (true, false),
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// `f128` crashes <https://github.com/llvm/llvm-project/issues/41838>
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"sparc" | "sparcv9" => (true, false),
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// `f16` miscompiles <https://github.com/llvm/llvm-project/issues/96438>
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"wasm32" | "wasm64" => (false, true),
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// Most everything else works as of LLVM 19
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_ => (true, true),
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};
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// If the feature is set, disable these types.
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let disable_both = env::var_os("CARGO_FEATURE_NO_F16_F128").is_some();
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println!("cargo::rustc-check-cfg=cfg(f16_enabled)");
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println!("cargo::rustc-check-cfg=cfg(f128_enabled)");
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if f16_ok && !disable_both {
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println!("cargo::rustc-cfg=f16_enabled");
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}
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if f128_ok && !disable_both {
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println!("cargo::rustc-cfg=f128_enabled");
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}
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}
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