Roman Cattaneo

cotire has a minimal number of target source files. The default is 2, but there is a cmake variable to change it. Have a look at the [manual](https://github.com/sakra/cotire/blob/master/MANUAL.md#disabling-precompiled-headers-for-small-targets).

While pre-compiled headers can also speedup the compilation of single cpp (for example, if the header files are large), the technique is mostly used to create a shared pre-compiled header...