I believe this is caused by https://fedoraproject.org/wiki/LTOByDefault
I built the srpm and noticed that the get_type() calls were present in
wrap_init.o but was missing from the .so
I added
%define _lto_cflags %{nil}
to the gtkmm .spec file and rebuilt--this disables LTO; the get_type() were
then present in the .so
I've left a comment at Fedora's bug tracker for them to disable lto in mm
packagesI've left a comment at Fedora's bug tracker for them to disable lto
in mm packages. But if we used g_type_ensure() then LTO would be possible I
think
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