On Wed, 18 Dec 2019 23:58:22 +0000
Sergei Trofimovich <slyfox@gentoo.org> wrote:

> [c] would be nice to be solved at portage level if portage could schedule
> multiple merges for the same package with different USE flags.

Related bugs:

- Portage should be able to auto-flip USE="test" & FEATURES="test" 
  https://bugs.gentoo.org/697914#c0

- Portage needs an extension to package.use specification to provide a
  level of discretion to portage to flip flags on its own 
  https://bugs.gentoo.org/698920#c0