(In reply to Christophe Giboudeaux from comment #20) > mmh, why don't we see this issue with gcc < 10 then? > > https://build.opensuse.org/package/show/KDE:Qt:5.15/libqt5-qtlocation is > green It started with the following GCC revision: https://gcc.gnu.org/git/gitweb.cgi?p=gcc.git;h=0b92cf305dcf3438 Since the revision we inline more and that's why the destructor is inlined to all callers in vector_tile.o and so that the symbol is not defined. That's why we seen the error.