Bug 828317 just landed and the build system now enforces using pymake
(not GNU make) to build on Windows. If you attempt to use GNU make, it
will complain loudly and tell you how to invoke pymake.
The short version of history is that pymake is faster and more stable
than GNU make on Windows because it can actually build with multiple
processes. Our builders have been using pymake on Windows for a while
and we (the build system maintainers) have little desire to continue
supporting GNU make on Windows because it offers little or no benefit
against the effort required to continue supporting it.
Gregory
Build Config Module Owner
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