On 3 January 2011 08:36, Touros Spoon wrote: > Jeffrey, > > thanks for the quick response. I actually tried appending LL to the end of > the value, but the compiler is still complaining, which isnt surprising > because a test shows that long long has a sizeof of 8 bytes, whereas > __int128_t reports 16 bytes. Read the fabulous manual: http://gcc.gnu.org/onlinedocs/gcc/_005f_005fint128.html "There is no support in GCC to express an integer constant of type __int128 for targets having long long integer with less then 128 bit width." Since your target's long long is not 128 bits wide, you cannot express that constant.