https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110334
--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> --- The desired symbol table before LTO streaming has no symbols in the skvx:: namespace Just look at the final symbol table when not compiling with -flto, it takes until the 'Optimized Symbol table' to do that, interestingly we have Reclaiming functions: Reclaiming variables: Clearing address taken flags: Optimized Symbol table: so it doesn't claim to do anything.