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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 |
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@@ -0,0 +1,84 @@ | ||
use std::env; | ||
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#[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>, | ||
} | ||
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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}"), | ||
}; | ||
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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(), | ||
} | ||
} | ||
} | ||
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/// 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), | ||
}; | ||
|
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// If the feature is set, disable these types. | ||
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)"); | ||
println!("cargo::rustc-check-cfg=cfg(f128_enabled)"); | ||
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if f16_ok && !disable_both { | ||
println!("cargo::rustc-cfg=f16_enabled"); | ||
} | ||
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if f128_ok && !disable_both { | ||
println!("cargo::rustc-cfg=f128_enabled"); | ||
} | ||
} |
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