Just landed in inbound [1] is a build system change that automatically
defines make's |-j| argument (the parallel process count) to be the
number of cores in your machine. Pending a backout, this means that you
no longer need to do anything to leverage all the cores in your machine
when building!
For the majority of you, MOZ_MAKE_FLAGS consists of |-jN| or |-jN -s|.
If you have the former, you can eliminate MOZ_MAKE_FLAGS from your
mozconfig and there should be no build time penalty. If you have |-s|,
if you build with |./mach build|, it uses silent mode by default, so
again, you don't need MOZ_MAKE_FLAGS.
Therefore, MOZ_MAKE_FLAGS can largely be considered unnecessary and
should slowly vanish from our mozconfigs and memories.
If you still want to define -j, the build system only sets this argument
if no value is defined in MOZ_MAKE_FLAGS.
I feel the build system should be as fast as possible by default - no
user action necessary. If you find that -j == # cores isn't providing
the fastest builds possible, please present your data and we'll change
the default value.
[1] https://tbpl.mozilla.org/?tree=Mozilla-Inbound&rev=7f5e2a9addff
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