> Why do you need more than one C++ compiler installed? Sometimes you need to upgrade your compiler but can't/don't want to rebuild the whole dependency graph.

> Why do you need more than one C++ compiler installed? Sometimes you need to upgrade your compiler but can't/don't want to rebuild the whole dependency graph. Because sometimes you need to import prebuilt libraries/modules provided by a third party, and you don't control how those were built. Keep in mind that C++ does not define a standard ABI.