Access DLL functions from LLVM IR

Dear LLVM Developer,
I would like to ask how do i call a function that is specified in a dll file that has been made by c or c++ from llvm assembly and how do I expose llvm bitcode made libraries that have been aoted to c/c++?
Regards,
Dylan Borg
+356 99214902
borgdylan@hotmail.com
borgdylang@gmail.com