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[libcxxabi] Automatically use static libunwind when required
If we attempt to use unwind_shared when LIBUNWIND_ENABLE_SHARED is OFF, we'll get link errors. LIBCXXABI_STATICALLY_LINK_UNWINDER_IN_SHARED_LIBRARY avoids that, but it seems redundant to have to specify it manually. Automatically switch libunwind statically when its shared build is disabled, which also matches compiler-rt [1]. [1] https://github.com/llvm/llvm-project/blob/71bfec762bd970e7834f58c158ddc15f93402d7a/compiler-rt/CMakeLists.txt#L238-L240 Reviewed By: #libc_abi, phosek Differential Revision: https://reviews.llvm.org/D158789
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