Translations:Upgrading GCC/20/en
From Gentoo Wiki
An ABI (Application Binary Interface), is a set of conventions used by all tools that deal with binary representation of programs, including compilers, assemblers, linkers, and language runtime support (source: GCC Binary Compatibility). When the ABI used for binary applications and libraries is changed, there is a risk getting linker errors or malfunctioning programs unless all libraries using C++ code are rebuilt.