Version 1.2.2 is available upstream. Please consider updating! It seems that version 1.2.2 is available upstream, while the latest version in the Gentoo tree is 1.2.1. You think this warning is false? Read more about it here.
Snappy is a compression/decompression library.
It does not aim for maximum compression, or compatibility with any
other compression library; instead, it aims for very high speeds and
reasonable compression.