Auto merge of #129721 - workingjubilee:rollup-y2o1mnp, r=workingjubilee

Rollup of 14 pull requests

Successful merges:

 - #128192 (rustc_target: Add various aarch64 features)
 - #129170 (Add an ability to convert between `Span` and `visit::Location`)
 - #129343 (Emit specific message for time<=0.3.35)
 - #129378 (Clean up cfg-gating of ProcessPrng extern)
 - #129401 (Partially stabilize `feature(new_uninit)`)
 - #129467 (derive(SmartPointer): assume pointee from the single generic and better error messages)
 - #129494 (format code in tests/ui/threads-sendsync)
 - #129617 (Update books)
 - #129673 (Add fmt::Debug to sync::Weak<T, A>)
 - #129683 (copysign with sign being a NaN can have non-portable results)
 - #129689 (Move `'tcx` lifetime off of impl and onto methods for `CrateMetadataRef`)
 - #129695 (Fix path to run clippy on rustdoc)
 - #129712 (Correct trusty targets to be tier 3)
 - #129715 (Update `compiler_builtins` to `0.1.123`)

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

1 files changed, 10 insertions, 3 deletions

diff --git a/compiler/rustc_codegen_llvm/src/attributes.rs b/compiler/rustc_codegen_llvm/src/attributes.rs
index 317e970d704..92a857c2adc 100644
--- a/compiler/rustc_codegen_llvm/src/attributes.rs
+++ b/compiler/rustc_codegen_llvm/src/attributes.rs
@@ -521,13 +521,20 @@ pub(crate) fn llfn_attrs_from_instance<'ll, 'tcx>(
 
     let function_features = function_features
         .iter()
-        .flat_map(|feat| {
-            llvm_util::to_llvm_features(cx.tcx.sess, feat).into_iter().map(|f| format!("+{f}"))
-        })
+        // Convert to LLVMFeatures and filter out unavailable ones
+        .flat_map(|feat| llvm_util::to_llvm_features(cx.tcx.sess, feat))
+        // Convert LLVMFeatures & dependencies to +<feats>s
+        .flat_map(|feat| feat.into_iter().map(|f| format!("+{f}")))
         .chain(codegen_fn_attrs.instruction_set.iter().map(|x| match x {
             InstructionSetAttr::ArmA32 => "-thumb-mode".to_string(),
             InstructionSetAttr::ArmT32 => "+thumb-mode".to_string(),
         }))
+        // HACK: LLVM versions 19+ do not have the FPMR feature and treat it as always enabled
+        // It only exists as a feature in LLVM 18, cannot be passed down for any other version
+        .chain(match &*cx.tcx.sess.target.arch {
+            "aarch64" if llvm_util::get_version().0 == 18 => vec!["+fpmr".to_string()],
+            _ => vec![],
+        })
         .collect::<Vec<String>>();
 
     if cx.tcx.sess.target.is_like_wasm {