There is the clang static analyzer which is part of the clang front end for llvm, but I don't know how well it works for C/C++. It seems most of their effort is going towards Objective-C.
http://clang-analyzer.llvm.org/
Doxygen is good for call graphs, you'll want to have GraphViz installed and use doxywizard to select the Call graphs and Called by graphs tick boxes in the Diagrams section (CALL_GRAPH and CALLER_GRAPH in the expert mode Dot section.)
