c - crosss compile for ARM7 : error: '__int128' is not supported for this target - 


typedef unsigned __int128 uint128_t;  static uint64_t mul64hi(uint64_t x, uint64_t y) {     return (uint64_t) ((((__int128) x) * ((__int128) y)) >> 64); }

it is. c compiler not required support 128 bit integral type, , platform seems such instance, or if does, it's not __int128. (try __int128_t or int128_t?)

consult compiler documentation absolute certainty, or consider using 3rd party large integer library, e.g. https://gmplib.org/


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