Clang in Gentoo now sets default runtimes via config file

The upcoming clang 16 release features substantial improvements to configuration file support. Notably, it adds support for specifying multiple files and better default locations. This enabled Gentoo to finally replace the default-* flags used on sys-devel/clang, effectively empowering our users with the ability to change defaults without rebuilding whole clang.

This change has also been partially backported to clang 15.0.2 in Gentoo, and (unless major problems are reported) will be part of the stable clang 15.x release (currently planned for upcoming 15.0.3).

In this post, I’d like to shortly describe the new configuration file features, how much of them have been backported to 15.x in Gentoo and how defaults are going to be selected from now on.
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