https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90081
--- Comment #7 from joseph at codesourcery dot com <joseph at codesourcery dot com> --- On Sat, 13 Apr 2019, bafap5 at yahoo dot com wrote: > int x = sizeof ((int8_t) 5); /* Correct, gives 1 */ > int y = sizeof (INT8_C(5)); /* Incorrect, gives 4 */ No, INT8_C(5) must expand to have type int, not int_least8_t, if int_least8_t promotes to int. See 7.20.4#3, "The type of the expression shall have the same type as would an expression of the corresponding type converted according to the integer promotions.". *Not* the type itself, the promoted type. I think expanding the macro to its argument is clearly correct here, including for UINT8_C, as the interpretation suggested in DR#456 regarding having an unsigned type in #if leads to the obvious absurdities I described in reflector message 13320 (15 May 2014).
