================
@@ -35,6 +35,25 @@
   } while (0)
 #endif
 
+// On AArch64 we use _LIBUNWIND_USE_CET to indicate that GCS is supported. We
+// need to guard any use of GCS instructions with __chkfeat though, as GCS may
+// not be enabled.
+#if defined(_LIBUNWIND_TARGET_AARCH64) && defined(__ARM_FEATURE_GCS_DEFAULT)
+#define _LIBUNWIND_USE_CET 1
+#include <arm_acle.h>
+
+#define _LIBUNWIND_POP_CET_SSP(x)                                              
\
+  do {                                                                         
\
+    if (__chkfeat(_CHKFEAT_GCS)) {                                             
\
+      unsigned int tmp = (x);                                                  
\
----------------
MaskRay wrote:

remove `int`

https://github.com/llvm/llvm-project/pull/99335
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