nico wrote:

That sounds believable.

We did update our compiler just an hour or so ago, so it's possible it will 
work for us now.

However, it suggests that the assumption `defined(__ARM_FEATURE_GCS_DEFAULT)` 
=> arm_acle.h has `__chkfeat()` isn't valid in this snippet in 
libunwind/src/cet_unwind.h 
(https://github.com/llvm/llvm-project/pull/99335/files#diff-7c503795ceadc957122b87cbf0dff76624c0576c291268226952dd822c75ea6eR41)

```
#if defined(_LIBUNWIND_TARGET_AARCH64) && defined(__ARM_FEATURE_GCS_DEFAULT)
#define _LIBUNWIND_USE_GCS 1
#include <arm_acle.h>
```

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