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Disable f16 on Aarch64 without neon

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LLVM has crashes at some `half` operations when built with assertions
enabled if fp-armv8 is not available [1]. Things seem to usually work,
but we are reaching LLVM undefined behavior so this needs to be
disabled.

[1]: https://github.com/llvm/llvm-project/issues/129394
This commit is contained in:
Trevor Gross 2025-03-01 23:05:19 +00:00
parent 8c392966a0
commit c51b229140
1 changed files with 7 additions and 0 deletions
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7
library/std/build.rs
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@ -12,6 +12,11 @@ fn main() {
.expect("CARGO_CFG_TARGET_POINTER_WIDTH was not set")
.parse()
.unwrap();
let target_features: Vec<_> = env::var("CARGO_CFG_TARGET_FEATURE")
.unwrap_or_default()
.split(",")
.map(ToOwned::to_owned)
.collect();
let is_miri = env::var_os("CARGO_CFG_MIRI").is_some();
println!("cargo:rustc-check-cfg=cfg(netbsd10)");
@ -101,6 +106,8 @@ fn main() {
("s390x", _) => false,
// Unsupported <https://github.com/llvm/llvm-project/issues/94434>
("arm64ec", _) => false,
// LLVM crash <https://github.com/llvm/llvm-project/issues/129394>
("aarch64", _) if !target_features.iter().any(|f| f == "neon") => false,
// MinGW ABI bugs <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115054>
("x86_64", "windows") if target_env == "gnu" && target_abi != "llvm" => false,
// Infinite recursion <https://github.com/llvm/llvm-project/issues/97981>