I skimmed through available checkers in Clang Static Analyzer  and didn’t find a checker for cyclomatic complexity.
My assumption is that checker is not implemented because it doesn’t help to find bugs directly . However I believe that this checker would help to reduce a number of bugs indirectly by decreasing a complexity of a source code.
Is there a way to see this checker in the upstream? If not what would be the best way to have it?
 By definition, "The Clang Static Analyzer is a source code analysis tool that finds bugs in C, C++, and Objective-C programs.” (from http://clang-analyzer.llvm.org/index.html)