https://gcc.gnu.org/bugzilla/show_bug.cgi?id=43622
--- Comment #31 from joseph at codesourcery dot com <joseph at codesourcery dot com> --- It can be an extended integer type in C2x, but then stdint.h would be required to have int128_t / uint128_t / int_least128_t / uint_least128_t typedefs, and integer constant suffixes would be needed for the corresponding macros INT128_C / UINT128_C (and the other stdint.h macros for the types would need to be defined as well), and printf/scanf support would be required as well.
