Apache GUMP (http://jakarta.apache.org/gump) is a system that continually builds most Java-based Apache projects and a large number of non-Apache Java projects. Integration with Gump is a recommended for projects graduating from the incubator.
There are not any C++ projects currently in Gump, but it may be possible to add log4cxx since it has an Ant build file. It would likely require adding APR to Gump since log4cxx depends on APR.
If accomplished, having APR and log4cxx added to Gump would provide rapid feedback to any inadvertent breaking of the build.