getopt_long returns 255

[huangshiyou]

When I tried to run wrk2 on an arm machine, it gives me incorrect results when parsing command-line arguments. It turns out that

wrk2/src/wrk.c

Line 721 in 44a94c1

while ((c = getopt_long(argc, argv, "t:c:d:s:H:T:R:LUBrv?", longopts, NULL)) != -1) {

assigns the return value of which the type is int to c of which the type is char. -1 is converted to 255.

Change char to signed char solves the problem.