In this paper, we describe our construction of a test harness to measure conformance of some popular C++ compilers and to measure the progress of the gcc C++ compiler as it moves toward ISO conformance. In an attempt to apply the same standard to all of the vendors, we use the same test cases and the same testing framework for all executions, even though some of the compilers are platform dependent and there is no common platform for all compilers. We found that the Python language provided the functionality that we needed with its scripting facility, its platform independence and its object orientation to facilitate code reuse. Python includes a testing framework as a module of the language and we have extended the framework to measure C++ ISO conformance.