https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77728
--- Comment #51 from Richard Earnshaw <rearnsha at gcc dot gnu.org> --- (In reply to Jonathan Wakely from comment #50) > (In reply to ktkachov from comment #3) > > Started with r225465. > > Something to do with alignment. > > I wonder if it's related to PR69841 ? > > Seems to be the same. Maybe PR 80149 too? With the latest trunk sources the testcase for PR80149 triggers the new ABI change warning; the testcase for PR69841 does also, but only when optimization is O1 or lower.