Version 2.3.5 is available upstream. Please consider updating! It seems that version 2.3.5 is available upstream, while the latest version in the Gentoo tree is 2.3.4-r1. You think this warning is false? Read more about it here.
muParser is a C++ library for mathematical expression parsing.
It is based on transforming an expression into a bytecode and
precalculating constant parts of it.