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Add build.rs config for reliable f16 and f128

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There are some complexities about what platforms we can test f16 and
f128 on.  Put this in build.rs so we have an easy way to configure tests
with a single attribute, and keep it up to date.
This commit is contained in:
Trevor Gross 2024-06-20 22:05:07 -04:00
parent 0314fe62bd
commit 99ed3d3e99
1 changed files with 62 additions and 0 deletions
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62
library/std/build.rs
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@ -7,6 +7,10 @@ fn main() {
let target_vendor =
env::var("CARGO_CFG_TARGET_VENDOR").expect("CARGO_CFG_TARGET_VENDOR was not set");
let target_env = env::var("CARGO_CFG_TARGET_ENV").expect("CARGO_CFG_TARGET_ENV was not set");
let target_pointer_width: u32 = env::var("CARGO_CFG_TARGET_POINTER_WIDTH")
.expect("CARGO_CFG_TARGET_POINTER_WIDTH was not set")
.parse()
.unwrap();
println!("cargo:rustc-check-cfg=cfg(netbsd10)");
if target_os == "netbsd" && env::var("RUSTC_STD_NETBSD10").is_ok() {
@ -70,4 +74,62 @@ fn main() {
println!("cargo:rustc-cfg=backtrace_in_libstd");
println!("cargo:rustc-env=STD_ENV_ARCH={}", env::var("CARGO_CFG_TARGET_ARCH").unwrap());
// Emit these on platforms that have no known ABI bugs, LLVM selection bugs, lowering bugs,
// missing symbols, or other problems, to determine when tests get run.
// If more broken platforms are found, please update the tracking issue at
// <https://github.com/rust-lang/rust/issues/116909>
//
// Some of these match arms are redundant; the goal is to separate reasons that the type is
// unreliable, even when multiple reasons might fail the same platform.
println!("cargo:rustc-check-cfg=cfg(reliable_f16)");
println!("cargo:rustc-check-cfg=cfg(reliable_f128)");
let has_reliable_f16 = match (target_arch.as_str(), target_os.as_str()) {
// Selection failure until recent LLVM <https://github.com/llvm/llvm-project/issues/93894>
// FIXME(llvm19): can probably be removed at the version bump
("loongarch64", _) => false,
// Selection failure <https://github.com/llvm/llvm-project/issues/50374>
("s390x", _) => false,
// Unsupported <https://github.com/llvm/llvm-project/issues/94434>
("arm64ec", _) => false,
// MinGW ABI bugs <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115054>
("x86", "windows") => false,
// x86 has ABI bugs that show up with optimizations. This should be partially fixed with
// the compiler-builtins update. <https://github.com/rust-lang/rust/issues/123885>
("x86" | "x86_64", _) => false,
// Missing `__gnu_h2f_ieee` and `__gnu_f2h_ieee`
("powerpc" | "powerpc64" | "powerpc64le", _) => false,
// Missing `__extendhfsf` and `__truncsfhf`
("riscv32" | "riscv64", _) => false,
// Most OSs are missing `__extendhfsf` and `__truncsfhf`
(_, "linux" | "macos") => true,
// Almost all OSs besides Linux and MacOS are missing symbols until compiler-builtins can
// be updated. <https://github.com/rust-lang/rust/pull/125016> will get some of these, the
// next CB update should get the rest.
_ => false,
};
let has_reliable_f128 = match (target_arch.as_str(), target_os.as_str()) {
// Unsupported <https://github.com/llvm/llvm-project/issues/94434>
("arm64ec", _) => false,
// ABI and precision bugs <https://github.com/rust-lang/rust/issues/125109>
// <https://github.com/rust-lang/rust/issues/125102>
("powerpc" | "powerpc64", _) => false,
// Selection bug <https://github.com/llvm/llvm-project/issues/95471>
("nvptx64", _) => false,
// ABI unsupported <https://github.com/llvm/llvm-project/issues/41838>
("sparc", _) => false,
// 64-bit Linux is about the only platform to have f128 symbols by default
(_, "linux") if target_pointer_width == 64 => true,
// Same as for f16, except MacOS is also missing f128 symbols.
_ => false,
};
if has_reliable_f16 {
println!("cargo:rustc-cfg=reliable_f16");
}
if has_reliable_f128 {
println!("cargo:rustc-cfg=reliable_f128");
}
}