[CCache](https://ccache.samba.org/) is a cache system designed to make compiling faster. When you run Meson for the first time for a given project, it checks if CCache is installed. If it is, Meson will use it automatically.
If you do not wish to use CCache for some reason, just specify your compiler with environment variables `CC` and/or `CXX` when first running Meson (remember that once specified the compiler can not be changed). Meson will then use the specified compiler without CCache.
When doing a code coverage build, Meson will check for existence of the binaries `gcovr`, `lcov` and `genhtml`. If version 3.3 or higher of the first is found, targets called *coverage-text*, *coverage-xml* and *coverage-html* are generated. Alternatively, if the latter two are found, only the target *coverage-html* is generated. Coverage reports can then be produced simply by calling e.g. `ninja coverage-xml`. As a convenience, a high-level *coverage* target is also generated which will produce all 3 coverage report types, if possible.
