I'd rather encourage a mechanism for port that provides a mechanism
for port authors to know how many processors there are and to enable
parallel builds if they know this to work.
Perhaps a switch "use_parallel_build [yes|no]" that will add "-j
2*CPUS" to build.args.
There's a bunch of other influences, such as number of cores and amount
of RAM and whether the build is using some bloated language like C++
and many other considerations, for the -j parameter.
So in the end I just made it an integer (build.jobs), and left the
heuristics up to the user :-)
--anders
PS. There's also a build.nice, if you want to go the other route (build
slower, like in background)
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