ilovepi wrote:

I managed to get ahold of an arm64 macbook. With this patch, it the build 
crashes building libunwind with the new compiler.  If I revert this patch, the 
build completes just fine. 

I think this needs to be reverted, until you can investigate the cause of the 
failure. Maybe some Apple folks have an idea of whats going wrong. I'll try to 
see if I can use lldb to point you in the right direction, but our kernel CI is 
on fire and I'm investigating other potential miscompiles.

My CMake invocation was:
```
cmake -GNinja -DLLVM_ENABLE_PROJECTS="clang;llvm;lld;compiler-rt" 
-DLLVM_ENABLE_RUNTIMES="libcxx;libcxxabi;libunwind" ../llvm 
-DCMAKE_BUILD_TYPE=RelWithDebInfo
```

https://github.com/llvm/llvm-project/pull/107168
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