From aaa8883ceb0d08b23e39ae78531dfabec6b12d0f Mon Sep 17 00:00:00 2001
From: David Tolnay <dtolnay@gmail.com>
Date: Tue, 28 Nov 2023 11:21:18 -0800
Subject: [PATCH] Handle CXCursor_LinkageSpec in Clang 18+

---
 bindgen/ir/item.rs | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/bindgen/ir/item.rs b/bindgen/ir/item.rs
index 4f2d361e51..dd587b088b 100644
--- a/bindgen/ir/item.rs
+++ b/bindgen/ir/item.rs
@@ -1433,8 +1433,11 @@ impl Item {
         }
 
         match cursor.kind() {
-            // Guess how does clang treat extern "C" blocks?
-            CXCursor_UnexposedDecl => Err(ParseError::Recurse),
+            // On Clang 18+, extern "C" is reported accurately as a LinkageSpec.
+            // Older LLVM treat it as UnexposedDecl.
+            CXCursor_LinkageSpec | CXCursor_UnexposedDecl => {
+                Err(ParseError::Recurse)
+            }
 
             // We allowlist cursors here known to be unhandled, to prevent being
             // too noisy about this.