Bug 682208

Summary:	sys-apps/portage: add an option to rebuild packages when they are installed
Product:	Portage Development	Reporter:	Pacho Ramos <pacho>
Component:	Core - Interface (emerge)	Assignee:	Portage team <dev-portage>
Status:	CONFIRMED ---
Severity:	normal	CC:	hydrapolic
Priority:	Normal
Version:	unspecified
Hardware:	All
OS:	Linux
Whiteboard:
Package list:		Runtime testing required:	---

Description Pacho Ramos gentoo-dev

2019-04-01 07:48:59 UTC

While taking a look into GCC upgrade guide I notice that I needed to manually check which packages are present on each of my systems to run
https://wiki.gentoo.org/wiki/Upgrading_GCC#Which_packages_are_known_to_need_a_rebuild.3F
# emerge --ask --oneshot --usepkg=n --verbose sys-devel/libtool sys-devel/llvm sys-devel/clang dev-python/wxpython dev-python/wxGTK

only for the relevant packages

Maybe it would be interesting to add a --rebuild command that would simply skip the packages that are not present in the system and, implicitly, pass --oneshot too. That way users will simply be able to run something like:

# emerge --ask --rebuild --usepkg=n --verbose sys-devel/libtool sys-devel/llvm sys-devel/clang dev-python/wxpython dev-python/wxGTK

and it will simply rebuild the packages from that list that are present in the system while skipping the others

Thanks a lot