https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118329
--- Comment #9 from Georg-Johann Lay <gjl at gcc dot gnu.org> --- Withe these changes and INT_N (PSI, 24), I am getting errors like error: ISO C does not support '__int24' types [-Wpedantic] __int24 and __uint24 were introduced in v4.8 and would work for older revisions of C. Is there a way to do the same with INT_N?