[libcxx-commits] [libcxxabi] [libc++abi] Improve error message when libunwind is missing from LLVM_ENABLE_RUNTIMES (PR #77991)

[Vitaly Buka via libcxx-commits]

vitalybuka wrote:

I guess this breaks almost all of our bots
http://lab.llvm.org/buildbot/#/builders/37
http://lab.llvm.org/buildbot/#/builders/168
http://lab.llvm.org/buildbot/#/builders/75
http://lab.llvm.org/buildbot/#/builders/18
http://lab.llvm.org/buildbot/#/builders/77
http://lab.llvm.org/buildbot/#/builders/5

https://github.com/llvm/llvm-project/pull/77991