https://clasp-developers.github.io/
https://github.com/clasp-developers/clasp
https://clasp-developers.github.io/clbind-doc.html
handle thread - https://github.com/sionescu/bordeaux-threads
Clasp: Common Lisp using LLVM and C++ for Molecular Metaprogramming
2018 LLVM Developers’ Meeting: C. Schafmeister "Lessons Learned Implementing Common Lisp with LLVM"