How to compile the psp program with clang

Hi Dears,
These days, i read some llvm backend dev articals, and found that llvm
support psp.
I konw there is psp information in clang TargetInfo.cpp source file.And
Sony announced the PS4 used clang to develop. I used the psp-gcc to
develop the psp games.Now I want to use clang instead of psp-gcc.So if
anybody know how to setup the psp-clang environment,please tell me.THX!
Thanks for your jobs!