Constant USING_SJLJ_EXCEPTIONS

pub const USING_SJLJ_EXCEPTIONS: bool = false;

32-bit ARM Darwin platforms uses SjLj exceptions.

The exception is watchOS armv7k (specifically that subarchitecture), which instead uses DWARF Call Frame Information (CFI) unwinding.

https://github.com/llvm/llvm-project/blob/llvmorg-18.1.4/clang/lib/Driver/ToolChains/Darwin.cpp#L3107-L3119