Whither default build variables for make files?

[Carter Schonwald]

Hey all,
I just did a checkout of the tip of ghc 8.0 branch and it looks like the
build.mk files have seen a bit of reorganization! Now for the perf aka
release  build the various doc variavles seem to be implicitly set
somewhere else and I got a bit lost when trying to dig them up.

On the flip side : is the shake build system alternative mature enough for
it to be reasonable to attempt using it on my Mac ?

Many thanks
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