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also skip abi_required_features check in rustdoc

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This commit is contained in:
Ralf Jung 2025-02-28 16:56:36 +01:00
parent dc04c0ca48
commit 4c939db0e7
2 changed files with 24 additions and 9 deletions
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17
compiler/rustc_codegen_ssa/src/target_features.rs
View file

@ -87,12 +87,17 @@ pub(crate) fn from_target_feature_attr(
// But ensure the ABI does not forbid enabling this.
// Here we do assume that LLVM doesn't add even more implied features
// we don't know about, at least no features that would have ABI effects!
if abi_feature_constraints.incompatible.contains(&name.as_str()) {
tcx.dcx().emit_err(errors::ForbiddenTargetFeatureAttr {
span: item.span(),
feature: name.as_str(),
reason: "this feature is incompatible with the target ABI",
});
// We skip this logic in rustdoc, where we want to allow all target features of
// all targets, so we can't check their ABI compatibility and anyway we are not
// generating code so "it's fine".
if !tcx.sess.opts.actually_rustdoc {
if abi_feature_constraints.incompatible.contains(&name.as_str()) {
tcx.dcx().emit_err(errors::ForbiddenTargetFeatureAttr {
span: item.span(),
feature: name.as_str(),
reason: "this feature is incompatible with the target ABI",
});
}
}
target_features.push(TargetFeature { name, implied: name != feature_sym })
}

16
tests/rustdoc-ui/target-feature-stability.rs
View file

@ -1,9 +1,13 @@
//! This is a regression test for <https://github.com/rust-lang/rust/issues/137366>, ensuring
//! that we can use the `neon` target feature on ARM-32 targets in rustdoc despite there
//! that we can use the `neon` target feature on ARM32 targets in rustdoc despite there
//! being a "forbidden" feature of the same name for aarch64, and rustdoc merging the
//! target features of all targets.
//@ check-pass
//@ compile-flags: --target armv7-unknown-linux-gnueabihf
//@ revisions: arm aarch64
//@[arm] compile-flags: --target armv7-unknown-linux-gnueabihf
//@[arm] needs-llvm-components: arm
//@[aarch64] compile-flags: --target aarch64-unknown-none-softfloat
//@[aarch64] needs-llvm-components: aarch64
#![crate_type = "lib"]
#![feature(no_core, lang_items)]
@ -15,4 +19,10 @@ pub trait Sized {}
// `fp-armv8` is "forbidden" on aarch64 as we tie it to `neon`.
#[target_feature(enable = "fp-armv8")]
pub fn fun() {}
pub fn fun1() {}
// This would usually be rejected as it changes the ABI.
// But we disable that check in rustdoc since we are building "for all targets" and the
// check can't really handle that.
#[target_feature(enable = "soft-float")]
pub fn fun2() {}