23.02.2025 21:58, Marc Espie пишет:
> On Sun, Feb 23, 2025 at 07:52:35PM +0100, Steffen Nurpmeso wrote:
>> Janne Johansson wrote in
>>  <CAA6-MF_8mqXvRkxMTQ-VYSWVYamLHuor+F2_50jv--fTYTo6xw@mail.gmail.com>:
>>  |Den lör 22 feb. 2025 kl 23:01 skrev Christian Weisgerber <naddy@mips.in\
>>  |ka.de>:
>>  |> Steffen Nurpmeso:
>>  |>> However, he also said
>>  |>>   Previously I recommended using a special value, such as "-j0", to mean
>>  |>>   "best guess".
>>  |>
>>  |> xz(1):
>>  |>   -T threads, --threads=threads
>>  |>          Specify the number of worker threads to use.  Setting
>>  |>          threads to a special value 0 makes xz use up to as many
>>  |>          threads as the processor(s) on the system support.
>>  |
>>  |That has worked fine for me using xz and other parallel compressors,
>>  |would work fine on make too, if it makes the option parsing simpler.
>>
>> Yes.  That.
>>
>> But to say (again and hope not to bore) that
>>
>>   num_online = MAX(1, sysconf(_SC_NPROCESSORS_ONLN))
>>   max_workers = sysconf(_SC_THREAD_THREADS_MAX)
>>   if(max_workers < 1 || max_workers > INT_MAX / (int)sizeof(pthread_t))
>>     max_workers = INT_MAX / sizeof (pthread_t);
> 
> I just wanted -j (nothing)
> to be a shorthand to "hey give me cpuonline"
> 
> if it's complicated I won't pursue it further

Why not go the -j0 (with or without space in between, as one would expect?

That'd be somewhat intuitive and useful as finger memory for the same stuff
across different without needing any mk.conf(5) bits.