/in/foo.cc: In function 'int main()':
/in/foo.cc:17:10: warning: overflow in implicit constant conversion [-Woverflow]
  setfib(n);
          ^
/tmp/ccAciuEF.o: In function `_GLOBAL__sub_I_a':
foo.cc:(.text.startup+0xa3): relocation truncated to fit: R_X86_64_PC32 against `.bss'
foo.cc:(.text.startup+0xc1): relocation truncated to fit: R_X86_64_PC32 against `.bss'
collect2: error: ld returned 1 exit status