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Fix CI for targets that conditionally disable
f16 or f128 support
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,84 @@ | ||
| use std::env; | ||
|
|
||
| #[allow(dead_code)] | ||
| pub(crate) struct Target { | ||
| pub(crate) triple: String, | ||
| pub(crate) os: String, | ||
| pub(crate) arch: String, | ||
| pub(crate) vendor: String, | ||
| pub(crate) env: String, | ||
| pub(crate) pointer_width: u8, | ||
| pub(crate) little_endian: bool, | ||
| pub(crate) features: Vec<String>, | ||
| } | ||
|
|
||
| impl Target { | ||
| pub(crate) fn from_env() -> Self { | ||
| let little_endian = match env::var("CARGO_CFG_TARGET_ENDIAN").unwrap().as_str() { | ||
| "little" => true, | ||
| "big" => false, | ||
| x => panic!("unknown endian {x}"), | ||
| }; | ||
|
|
||
| Self { | ||
| triple: env::var("TARGET").unwrap(), | ||
| os: env::var("CARGO_CFG_TARGET_OS").unwrap(), | ||
| arch: env::var("CARGO_CFG_TARGET_ARCH").unwrap(), | ||
| vendor: env::var("CARGO_CFG_TARGET_VENDOR").unwrap(), | ||
| env: env::var("CARGO_CFG_TARGET_ENV").unwrap(), | ||
| pointer_width: env::var("CARGO_CFG_TARGET_POINTER_WIDTH") | ||
| .unwrap() | ||
| .parse() | ||
| .unwrap(), | ||
| little_endian, | ||
| features: env::var("CARGO_CFG_TARGET_FEATURE") | ||
| .unwrap_or_default() | ||
| .split(",") | ||
| .map(ToOwned::to_owned) | ||
| .collect(), | ||
| } | ||
| } | ||
| } | ||
|
|
||
| /// Configure whether or not `f16` and `f128` support should be enabled. | ||
| pub(crate) fn configure_f16_f128(target: &Target) { | ||
| // Set whether or not `f16` and `f128` are supported at a basic level by LLVM. This only means | ||
| // that the backend will not crash when using these types. This does not mean that the | ||
| // backend does the right thing, or that the platform doesn't have ABI bugs. | ||
| // | ||
| // We do this here rather than in `rust-lang/rust` because configuring via cargo features is | ||
| // not straightforward. | ||
| // | ||
| // Original source of this list: | ||
| // <https://github.com/rust-lang/compiler-builtins/pull/652#issuecomment-2266151350> | ||
| let (f16_ok, f128_ok) = match target.arch.as_str() { | ||
| // `f16` and `f128` both crash <https://github.com/llvm/llvm-project/issues/94434> | ||
| "arm64ec" => (false, false), | ||
| // `f16` crashes <https://github.com/llvm/llvm-project/issues/50374> | ||
| "s390x" => (false, true), | ||
| // `f128` crashes <https://github.com/llvm/llvm-project/issues/96432> | ||
| "mips64" | "mips64r6" => (true, false), | ||
| // `f128` crashes <https://github.com/llvm/llvm-project/issues/101545> | ||
| "powerpc64" if &target.os == "aix" => (true, false), | ||
| // `f128` crashes <https://github.com/llvm/llvm-project/issues/41838> | ||
| "sparc" | "sparcv9" => (true, false), | ||
| // `f16` miscompiles <https://github.com/llvm/llvm-project/issues/96438> | ||
| "wasm32" | "wasm64" => (false, true), | ||
| // Most everything else works as of LLVM 19 | ||
| _ => (true, true), | ||
| }; | ||
|
|
||
| // If the feature is set, disable these types. | ||
| let disable_both = env::var_os("CARGO_FEATURE_NO_F16_F128").is_some(); | ||
|
|
||
| println!("cargo::rustc-check-cfg=cfg(f16_enabled)"); | ||
| println!("cargo::rustc-check-cfg=cfg(f128_enabled)"); | ||
|
|
||
| if f16_ok && !disable_both { | ||
| println!("cargo::rustc-cfg=f16_enabled"); | ||
| } | ||
|
|
||
| if f128_ok && !disable_both { | ||
| println!("cargo::rustc-cfg=f128_enabled"); | ||
| } | ||
| } |
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