From 8119f1854948b50358bbfaea08f207f51970f06c Mon Sep 17 00:00:00 2001 From: Khem Raj Date: Mon, 27 Apr 2026 00:35:24 -0700 Subject: [PATCH] libcxxabi: declare __gnu_unwind_frame in cxa_personality (#189787) ARM EHABI builds of libcxxabi fail with clang-22+ because cxa_personality.cpp calls __gnu_unwind_frame without a visible declaration, triggering: error: use of undeclared identifier '__gnu_unwind_frame' Add an extern "C" forward declaration before the EHABI unwind helper so the source compiles correctly. Signed-off-by: Khem Raj --- libcxxabi/src/cxa_personality.cpp | 2 ++ 1 file changed, 2 insertions(+) diff --git a/libcxxabi/src/cxa_personality.cpp b/libcxxabi/src/cxa_personality.cpp index 35f4e3807724..6599f8974011 100644 --- a/libcxxabi/src/cxa_personality.cpp +++ b/libcxxabi/src/cxa_personality.cpp @@ -1116,6 +1116,8 @@ __gxx_personality_seh0(PEXCEPTION_RECORD ms_exc, void *this_frame, #else +extern "C" _Unwind_Reason_Code __gnu_unwind_frame(_Unwind_Exception*, _Unwind_Context*); + // Helper function to unwind one frame. // ARM EHABI 7.3 and 7.4: If the personality function returns _URC_CONTINUE_UNWIND, the // personality routine should update the virtual register set (VRS) according to the