https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90885
--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> --- And maybe also 10^X where X is a literal. https://codesearch.isocpp.org/cgi-bin/cgi_ppsearch?q=10+%5E&search=Search A sample: tp->tv_sec = attributes[0] / 10^9; tp->tv_nsec = attributes[0] % 10^9; range->pmin[TREND_FCT] = -10^10; range->pmax[TREND_MEAN] = 10^10; #define IRQ_CHINT5_LEVEL (12 ^ 7) #define IRQ_CHINT4_LEVEL (11 ^ 7) #define IRQ_CHINT3_LEVEL (10 ^ 7) #define IRQ_CHINT2_LEVEL (9 ^ 7) #define IRQ_CHINT1_LEVEL (8 ^ 7)