I am currently adding cabal-install flags tell cabal-install how to

compile the setup program (in case the "external method" is used.

Now what should I do? Should I ...

a)  extend global flags?

b) extend only ConfigExFlags?
    (which means users cannot cross-compile without explicitly calling

      'configure', OTOH users can set these values in cabal config file)

c) continue to add a set of flags to every command?

My preferences: (b) > (c) > (a).

What do you think?

With best regards

Sven Heyll