Scripts merged for easily loading and running GHC in GHCi, for fast development iterations

Matthew Pickering matthewtpickering at
Sun Jul 29 07:41:40 UTC 2018

Can you please update the wiki page?


On Sun, Jul 29, 2018 at 6:18 AM, Michael Sloan <mgsloan at> wrote:
> Hello GHC developers!
> Now that D4904 and D4986 are merged, if you have recently built GHC
> then you can use "./utils/ghc-in-ghci/ -fobject-code" to load
> GHC into GHCi (throwing on a "-j8" helps too).  For me, this makes
> development far more pleasant, as often I can make a change and try it
> out in only 15 or 20 seconds.  Thanks to Csongor Kiss for writing the
> initial ghci script, and Matthew Pickering for posting about it to the
> mailinglist, as otherwise I probably wouldn't have known about it.
> I wrote a blog post about the topic on my new blog:
> Once D5015 is merged, the explicit "-fobject-code" won't be needed.
> Once is addressed, it
> might not be needed at all, leading to even faster loading ;)
> Happy ghci-ing!
> -Michael
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