Re: [bug #56701] Do not allow -j without a number

[David Boyce]

My vote is to leave -j alone. Everyone knows it shouldn't be used that way in production, especially on shared host, but I've been known to use -j alone when testing out the parallel-safety of a makefile or in various other ad-hoc test scenarios. I could even imagine it being used deliberately as a stress test.

What might make more sense to me would be introducing a new syntax like -j#2 which would evaluate to 2 * $(nproc), with caveats to previous $(nproc) discussion.

On Mon, Aug 26, 2019 at 8:04 AM Dmitry V. Levin <address@hidden> wrote:

Follow-up Comment #4, bug #56701 (project make):

FWIW, nproc(1) is part of GNU coreutils, it is based on nproc module from
gnulib, so the way it works is probably as much portable as one can get.

If GNU make was using gnulib directly, it would cost just a single invocation
of num_processors.

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