CoFlo
C and C++ control flow graph generator and analyzer
CoFlo generates Control-Flow Graphs from C and C++ source code. It can then output the graphs in a number of ways and perform various control flow analyses.
NOTE: CoFlo has not been under active development for several years. At this time, I suggest you look into LLVM-based tooling to see if there is anything similar to CoFlo which will meet your needs.