On Mon, Jan 10, 2022 at 01:59:13AM +0100, Morgan Wesström wrote:
> On a freshly updated system (emerge -uDN @world):
> 
> "emerge @changed-deps" wants to reinstall 0 packages.
> 
> "emerge -u --changed-deps=y" wants to reinstall 24 packages.
> 
> "emerge -uD --changed-deps=y" wants to reinstall 181 packages.
> 
> A couple of years ago there was a build breakage in Portage because, as I 
> understood it at the time, some developer changed the dependencies in an 
> existing ebuild without bumping its revision level. The solution was to use 
> --changed-deps=y to catch these occurrences and I've been using it in my 
> regular update routine since then. But as you can see in the third example 
> above, it usually wants to reinstall hundreds of packages that doesn't have 
> any 
> updated versions and I'm wondering if this is working as intended. I have a 
> hard time believing that gentoo devs are pushing changes to existing ebuilds 
> in 
> such numbers on a regular basis without bumping the revision level.
> 
> Some time ago I became aware that Portage now has a @changed-deps set, which 
> I 
> assumed was accomplishing the same thing, but it doesn't produce the same 
> result as --changed-deps=y - usually just a dozen reinstalls or so.
> 
> Can someone please elaborate on what's going on here, what the difference is 
> between --changed-deps=y and @changed-deps, if that difference is intended 
> and 
> what the recommended update procedure is these days to catch these and other 
> kinds of inconsistencies in Portage?
> 
> Regards
> Morgan

Don't know if it's relevant or not but recently upstream deprecated the
"KERNEL" USE flag, resulting in many rebuilds for packages.

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