Configured via:
$ cmake ../runtimes -G Ninja -DLLVM_ENABLE_LLD=ON \
-DCMAKE_BUILD_TYPE=Release -DLLVM_ENABLE_RUNTIMES="libc" \
-DLIBC_TARGET_TRIPLE=i386-linux-gnu -DCMAKE_C_COMPILER=clang \
-DCMAKE_CXX_COMPILER=clang++
Link: #93709