m4 / autconf help? (WIP patch for improving the CPP sitch)

[Carter Schonwald]

Hey all,
I"ve a WIP patch https://ghc.haskell.org/trac/ghc/ticket/8683
for making it easy to separately specify the CPP program command and
associated flags in the ghc settings file.

The haskell code part, for handling the dynflags / parsing the settings
file etc tests out fine, i'm a bit stumped on how to get autoconf /m4 to
work correctly for instantiating the desired values into the
settings.intemplate though! (which happens at configure time)

any help / wisdom?

thanks!
-Carter
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