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Support #[align(…)] on fns in extern blocks

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This commit is contained in:
Jules Bertholet
2025-06-29 13:01:41 -04:00
parent 97a7b9b1b4
commit a1cefee8d5
2 changed files with 15 additions and 1 deletions
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2
compiler/rustc_passes/src/check_attr.rs
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@@ -1915,7 +1915,7 @@ impl<'tcx> CheckAttrVisitor<'tcx> {
/// Checks if the `#[align]` attributes on `item` are valid. /// Checks if the `#[align]` attributes on `item` are valid.
fn check_align(&self, span: Span, target: Target, align: Align, repr_span: Span) { fn check_align(&self, span: Span, target: Target, align: Align, repr_span: Span) {
match target { match target {
Target::Fn | Target::Method(_) => {} Target::Fn | Target::Method(_) | Target::ForeignFn => {}
Target::Struct | Target::Union | Target::Enum => { Target::Struct | Target::Union | Target::Enum => {
self.dcx().emit_err(errors::AlignShouldBeReprAlign { self.dcx().emit_err(errors::AlignShouldBeReprAlign {
span: repr_span, span: repr_span,

14
tests/codegen/align-fn.rs
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@@ -116,3 +116,17 @@ pub fn align_specified_twice_2() {}
#[align(32)] #[align(32)]
#[align(256)] #[align(256)]
pub fn align_specified_twice_3() {} pub fn align_specified_twice_3() {}
const _: () = {
// CHECK-LABEL: align_unmangled
// CHECK-SAME: align 256
#[unsafe(no_mangle)]
#[align(32)]
#[align(256)]
extern "C" fn align_unmangled() {}
};
unsafe extern "C" {
#[align(256)]
fn align_unmangled();
}