Re: [PATCH 3/9] test-mergesort: add test subcommand

>
> On Fri, Oct 01 2021, Junio C Hamano wrote:
>
>> René Scharfe <l.s.r@web.de> writes:
>>
>>> +static void dist_rand(int *arr, int n, int m)
>>> +{
>>> +	int i;
>>> +	for (i = 0; i < n; i++)
>>> +		arr[i] = rand() % m;
>>> +}
>>> ...
>>> +static void dist_shuffle(int *arr, int n, int m)
>>> +{
>>> +	int i, j, k;
>>> +	for (i = j = 0, k = 1; i < n; i++)
>>> +		arr[i] = (rand() % m) ? (j += 2) : (k += 2);
>>> +}
>>
>> I briefly wondered if we want to seed the rand() in some way to make
>> the tests reproducible, but we'd need to ship our own rand() if we
>> wanted to go that route, which would probably be too much.
>
> Wouldn't calling srand() with some constant value suffice on most
> platforms? I'm aware of it being a NOOP and rand() always being randomly
> seeded on (IIRC) OpenBSD, but that should work on e.g. glibc.