Re: [gentoo-dev] Re: How to set CXX compiler?

[陈贤文]

The ebuild is missing an "inherit" line below the "EAPI" one that specifies 
"toolchain-funcs" (which is the eclass that provides the "tc-*" functions. Try

EAPI=7
inherit toolchain-funcs

Fantastic! Thank you very much! This fixed the problem!