[libcxx-commits] [libcxxabi] [libc++abi] Provide an explicit error when trying to build for MSVC (PR #119370)

[Martin Storsjö via libcxx-commits]

mstorsjo wrote:

Looks resonable.

We could also consider doing the same for libunwind. While most of libunwind also is pointless as it is tied to the Itanium ABI, one could in theory want to use an API like `_Unwind_Backtrace`. But libunwind doesn't build in this configuration right now, and would require some more tweaks. (This was suggested in https://reviews.llvm.org/D86612 earlier.) So until that's actually fixed up so that libunwind compiles in that configuration, libunwind probably also would benefit from such an early message to users who try to enable it without knowing why they would need it.

https://github.com/llvm/llvm-project/pull/119370