The headline feature to which I referred, from http://www.zapcc.com/product/features/ http://www.zapcc.com/product/features/, is "Zapcc caches compiled headers

The headline feature to which I referred, from http://www.zapcc.com/product/features/ http://www.zapcc.com/product/features/, is "Zapcc caches compiled headers and generated code between compiles". So a cache of what was generated last time, which will have to be replaced if the input files or compile command changes. So, a lot like ccache. Which is why I asked.