Martin Storsjo has created a mingw cross compiler toolchain for LLVM based on the clang tools called llvm-mingw. This is a port created by @theron.tarigo_gmail.com that uses the ports tree to assemble a similar toolchain.
llvm-mingw is a drop in replacement for the gcc based mingw32 toolchain. There are some differences in the linker system as [[ https://github.com/mstorsjo/llvm-mingw#known-issues | noted by Martin Storsjo ]].