C/C++ unit test coverage

[Michael Brailsford]

Is there a tool like clover for C++ unit tests?  I have been using CxxTest for unit tests for my C/C++ code, but I would like to get coverage analysis.  I should mention that we are *not* using gcc/g++ as our compiler, rather xlc/xlC (AIX) and whatever the standard VMS compiler is.  I prefer an open source tool, if it exists.  Any help would be appreciated, even if the coverage analysis tool only works with CppUnit/CppUnitLite, etc...

-Michael