https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83077
--- Comment #13 from Iain Sandoe <iains at gcc dot gnu.org> --- (In reply to Iain Sandoe from comment #12) > (In reply to Iain Sandoe from comment #11) > > (In reply to François Dumont from comment #10) > > > This is because you are facing the PR65762 issue. I just attached a path > > > proposal to it that you need to apply too to be able to run your test. > > > You'll be even able to simply use --disable-libstdcxx-dual-abi cause I > > > made > > > cxx11 abi the default in this case. > > > > Yes, with the second patch applied, that works for me also. > > > > Does gnu-versioned-namespace work for you with these two patches applied? > > (I have a patch to enable versioned namespace on Darwin, which is very > > similar to the GNU one, but it no longer builds).. It looks like this was a merge artefact, which I resolved and now it builds - I have some testsuite fails to examine.