Now it is very compilicated to build clang with using link compile flags then copy the C++ library as runtime etc.
Citing Getting a Modern Host C++ Toolchain
https://www.llvm.org/docs/GettingStarted.html
I’m asking for a solution similar to the way the other build dependencies of LLVM are added. E.g. a custom zlib needs an include and a library path and cmake recognizes it. While a gcc toolchain needs special knowledge again about flags and it is complicated again. I am looking for a simple solution which will make the clang build easy and cmake will find everything needed to build. With libc++ it is even more difficult since shlibs and static libraries break the build while they should make it easier.