From d71ed8d19bcfdbd6eb3bf2620071f2ab95470a57 Mon Sep 17 00:00:00 2001
From: Nikita Popov <npopov@redhat.com>
Date: Mon, 11 Aug 2025 17:18:23 +0200
Subject: Tell LLVM about read-only captures

`&Freeze` parameters are not only `readonly` within the function,
but any captures of the pointer can also only be used for reads.
This can now be encoded using the `captures(address, read_provenance)`
attribute.
---
 compiler/rustc_codegen_llvm/src/llvm/ffi.rs | 1 +
 1 file changed, 1 insertion(+)

(limited to 'compiler/rustc_codegen_llvm/src/llvm/ffi.rs')

diff --git a/compiler/rustc_codegen_llvm/src/llvm/ffi.rs b/compiler/rustc_codegen_llvm/src/llvm/ffi.rs
index 55d26a97e2d..2461f70a86e 100644
--- a/compiler/rustc_codegen_llvm/src/llvm/ffi.rs
+++ b/compiler/rustc_codegen_llvm/src/llvm/ffi.rs
@@ -251,6 +251,7 @@ pub(crate) enum AttributeKind {
     Writable = 42,
     DeadOnUnwind = 43,
     DeadOnReturn = 44,
+    CapturesReadOnly = 45,
 }
 
 /// LLVMIntPredicate
-- 
cgit 1.4.1-3-g733a5