dmnks left a comment (rpm-software-management/rpm#3651)
> We currently set the RPM_BUILD_NCPUS envvar before calling rpmbuild to set a
> desired value of parallelism. Is that the official way to do this? Should
> this be documented?
I'm not sure but it seems like `RPM_BUILD_NCPUS` is primarily meant for
*reading* from within build scriptlets whereas `%_smp_build_ncpus` is the
actual tunable.
Then there are the (relatively new) `%_smp_tasksize_*` macros for fine-tuning
the above.
So apparently, it's pretty unclear and we should indeed document this better.
There's some rudimentary comments in `macros.in` but it could be better,
perhaps done as part of #3621.
> Would it make sense to add an `--ncpus` option to rpmbuild to set
> RPM_BUILD_NCPUS?
Sounds like a potential RFE, too.
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