I can produce the first missing symbol with current gcc trunk on MacOS X 10.4 using this testcase...
main() { __int128_t a, b; b= a % 10; } When compiled with "gcc-4 -m64 modulo.c", this produces the linkage failure of... can't resolve symbols: ___modti3, referenced from: _main in cc87vdlF.o ld64 failed: symbol(s) not found collect2: ld returned 1 exit status Hopefully this helps. Jack