This is a tool for removing excess functions from C code. It is possible to dramatically reduce the runtime of the C parser and friends (and your resulting find_theorems search space) by removing functions you are not calling before parsing.
You will need the libclang and glib headers available to build this. I have not located a packaged version of libclang and LLVM that work together, so I recommend you build these from source as described on the Clang getting started page. I have successfully built this tool using r207601 of all the LLVM pieces.
Run prune --help for options. For anything more, read the source code.
No attempt is made to automatically prune anything other than functions. Other
entities don't cost us much in parsing. If you do want to explicitly prune
other things you can use the --blacklist option.
Some tricky C is clever enough to even baffle Clang (e.g. seL4_IPCBuffer alignment). Report anything serious, but minor issues like this will have to be worked around yourself.
Email Matthew Fernandez with questions or problems.