compiler cache for fast recompilation of C/C++/Rust code

 Sccache is a compiler cache.
 It speeds up recompilation
 by caching previous compilations
 and detecting when the same compilation is being done again.
 .
 Compared to ccache,
 sccache caches not only C and C++ but also Rust code
 and can store its cache using certain cloud storage,
 but tracks objects by their full paths
 (ccache tracks objects more flexibly).