I am not aware of any Debian local patches which could trigger that. Please could you check if you can reproduce this with GCC 8 as well?
- Bug#894302: g++-7: Compiler generates wrong code with warni... Matthias Klose
- Bug#894302: Re[2]: g++-7: Compiler generates wrong cod... Vadim Zeitlin
- Bug#894302: Re[2]: g++-7: Compiler generates wrong... Matthias Klose
