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...e bootstrapping. In order to even configure the LLVM sanitizer runtimes you need libc and many other OS interfaces, so when bootstrapping you need to build the compiler-rt builtins library separately from the sanitizers. This can be done either by using the `LLVM_ENABLE_RUNTIMES` CMake option (see DistributionExample-stage2.cmake in clang/cmake/caches), or by treating compiler-rt/lib/builtins as the top-level CMake file. I would strongly suggest that you start with one of the CMake cache files under clang/cmake/caches as an example because setting up the CMake options to build a toolchain that can cross-compi...