Minimal systems can be assembled entirely from binary packages, eliminating the need for many of the packages that are required in a system that is capable of building packages. In order to create profiles for minimal systems like these, it would be useful to be able to use -* in the "packages" files, in order to discard unneeded packages from parent profiles. For example, gentoo's "base" profile contains many settings that are essential for all profiles, but without support for -* in the "packages" file, it is unnecessarily difficult for minimal profile that inherits it to negate all of the atoms found in the base "packages" file.
Patch posted for review:
This is in the master branch:
Fixed in portage-2.3.5.
Documentation patch posted:
Documentation is in the master branch: