https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69953
--- Comment #38 from Martin Liška <marxin at gcc dot gnu.org> --- So downloading the package and testing that with problematic 6.3 does not reproduce. Can you please verify you have really GCC 6.4? If so, would it be possible to create a virtual machine or a Docker image which I can replay and thus reproduce?