I want to generate list of called functions from a c source file

ctags -x --c-kinds=f *.c

will give me functions defined in these C files.

But I want instead just the functions called in these C files.

I couldn't find that option in ctags, and cscope appears only interactive.

How can I get a list of t开发者_如何学编程he functions called in one or more C files, sent to stdout for further piping/filtering?