On linux if you specify the an external libc++ and clang will still link to the system's libc++. This patch fixes that. Fixes https://github.com/llvm/llvm-project/issues/116040
On linux if you specify the an external libc++ and clang will still link to the system's libc++. This patch fixes that. Fixes https://github.com/llvm/llvm-project/issues/116040