Auto merge of #146685 - jdonszelmann:rollup-kwuih4z, r=jdonszelmann

Rollup of 7 pull requests

Successful merges:

 - rust-lang/rust#146458 (Add parallel-frontend-threads to bootstrap.toml and enable multi-threaded parallel compilation)
 - rust-lang/rust#146485 (Remove unsized arg handling in `ArgAbiBuilderMethods::store_fn_arg` implementations)
 - rust-lang/rust#146536 (clean up several trait related UI tests)
 - rust-lang/rust#146598 (Make llvm_enzyme a regular cargo feature)
 - rust-lang/rust#146647 (Move `#[rustc_coherence_is_core]` to the `crate_level` file)
 - rust-lang/rust#146654 (Do not use `git -C dir`)
 - rust-lang/rust#146681 (Add space after brace in `Box<[T]>::new_uninit_slice` example)

r? `@ghost`
`@rustbot` modify labels: rollup

1 files changed, 2 insertions, 1 deletions

diff --git a/compiler/rustc_builtin_macros/src/autodiff.rs b/compiler/rustc_builtin_macros/src/autodiff.rs
index 48d0795af5e..f4a923797e2 100644
--- a/compiler/rustc_builtin_macros/src/autodiff.rs
+++ b/compiler/rustc_builtin_macros/src/autodiff.rs
@@ -209,7 +209,8 @@ mod llvm_enzyme {
         mut item: Annotatable,
         mode: DiffMode,
     ) -> Vec<Annotatable> {
-        if cfg!(not(llvm_enzyme)) {
+        // FIXME(bjorn3) maybe have the backend directly tell if autodiff is supported?
+        if cfg!(not(feature = "llvm_enzyme")) {
             ecx.sess.dcx().emit_err(errors::AutoDiffSupportNotBuild { span: meta_item.span });
             return vec![item];
         }