================
@@ -293,6 +293,7 @@ option(LIBCXX_ENABLE_THREADS "Build libc++ with support for 
threads." ON)
 option(LIBCXX_ENABLE_MONOTONIC_CLOCK
   "Build libc++ with support for a monotonic clock.
    This option may only be set to OFF when LIBCXX_ENABLE_THREADS=OFF." ON)
+option(LIBCXX_USE_LLVM_LIBC "Build libc++ against LLVM libc." OFF)
----------------
ldionne wrote:

We have a solution to the same problem for selecting the ABI library: 
`set(LIBCXX_SUPPORTED_ABI_LIBRARIES none libcxxabi system-libcxxabi libcxxrt 
libstdc++ libsupc++ vcruntime)`.

There's `libcxxabi` (in-tree) and `system-libcxxabi` (whatever libc++abi is 
installed on the system).

https://github.com/llvm/llvm-project/pull/99287
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