It might not have been obvious, but if you read Dominiques E-Mails, you will notice that the transition to GCC 7 we also did another transition.
Tumbleweed is now built with PIE (Position Independend Executables) as default.
This is achieved by a gcc defaults override in the "gcc-PIE" package.
This allows full ASLR (address space randomization) for all binaries without specific need to change your actual package, making attacks much harder.
While I am still fixing some stragglers where the default did not trigger, and subtracting the packages where PIE was too tricky currently (emacs, qemu, small number of others), I would estimate a 97% coverage at this time. An rpmlint check will be added.