https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64812
--- Comment #2 from Markus Trippelsdorf <trippels at gcc dot gnu.org> --- (In reply to Markus Trippelsdorf from comment #1) > Please try to narrow down the issue and attach prepossessed testcases > (of fmgridif.cxx and ColumnControl.cxx for a start). > Also find out where the `non-virtual thunk to > WindowListenerMultiplexer::acquire()' comes from in a successful build. > (add -Wl,--no-demangle to the link command, and search object files > for the unmangled symbol.) Sorry, this should read: Please try to narrow down the issue and attach preprocessed testcases (of fmgridif.cxx and ColumnControl.cxx for a start). Also find out where the `non-virtual thunk to WindowListenerMultiplexer::acquire()' comes from in a successful build. (add -Wl,--no-demangle to the link command, and search object files for the mangled symbol.)