I'm going by my rather poor memory for this. Frankly, I don't really care where the option sits, as long as I don't need a separate build of GHC to avoid LGPL.
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From: Ben Gamari
I can't seem to find the exact trac ticket, but the ability to swap out "Integer" implementations at link time would be a huge relief on Windows, which suffers from various problems with dynamic linking. I believe it was originally slated for 7.12. Can someone find it? Here's what I did find: https://ghc.haskell.org/trac/ghc/wiki/ReplacingGMPNotes
A related discussion: https://github.com/commercialhaskell/stack/issues/399
As it stands, we've been trying hard to find good ways to provide custom GHC variants more easily to end users.
Hmm, interesting. I'm not sure how realistic it is to make this a link-time option, however, considering that we may inline bindings from whatever integer package we compile against into the user's program. Herbert, do you have any thoughts on this? Cheers, - Ben