This Arch ticket has related information: https://bugs.archlinux.org/task/65968 In my case, this only caused issues with dev-lang/rust, which was then unable to pull git repositories as dependencies, breaking some builds. A quick rebuild of libgit2 fixed the problem immediately. I'm not familiar with ebuild development, but I assume there's some sort of construct to signal ABI breakage that requires a rebuild of dependant packages.
Oh my. Sad this wasn't reported before both versions went stable. I guess I'll bump subslot on both versions then, to force rebuilds on everyone.
The bug has been closed via the following commit(s): https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=417a576faac16b8ce823e0c710f0a7b2ee5c0b0e commit 417a576faac16b8ce823e0c710f0a7b2ee5c0b0e Author: Michał Górny <mgorny@gentoo.org> AuthorDate: 2020-11-17 16:19:48 +0000 Commit: Michał Górny <mgorny@gentoo.org> CommitDate: 2020-11-17 16:22:06 +0000 net-libs/http-parser: Bump subslot to provoke rebuilds Closes: https://bugs.gentoo.org/754993 Signed-off-by: Michał Górny <mgorny@gentoo.org> .../{http-parser-2.9.3.ebuild => http-parser-2.9.3-r1.ebuild} | 3 ++- .../{http-parser-2.9.4.ebuild => http-parser-2.9.4-r1.ebuild} | 4 +++- 2 files changed, 5 insertions(+), 2 deletions(-)