Almost everything else is a non-starter in commercial settings because of their lack of credible support contracts.

Sorry I don't see how. RHEL7 is quite modern, however, you could always get bleeding edge anything with software collections[1], of which Redhat has a blessed set of packages in software collections named the developer toolset[2].

[1] https://www.softwarecollections.org/en/

[2] http://developerblog.redhat.com/tag/developer-toolset/