https://gcc.gnu.org/bugzilla/show_bug.cgi?id=127806
--- Comment #1 from Jeffrey A. Law <law at gcc dot gnu.org> --- It's harder to see these days, but yes this is real. It shows up more with libraries other than libgcc. So think the sanitizers and libstdc++. I'd bet if you had a graph like Kyrylo did in the AI/LLM discussion of cpu utilization and you did a build with many multilibs it'd probably be pretty obvious.
