[Bug preprocessor/119391] [C++20] Preprocessor tokens should evaluate signed integer expressions in two's complement

[jakub at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119391

--- Comment #8 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Most of arithmetics is still UB on signed overflow even in C++20, there are
just small exceptions like the left shift.