[Haskell-cafe] problems with "stack ghc"

Michael Snoyman michael at snoyman.com
Wed Jul 12 02:41:45 UTC 2017

No, the `ghc` command has no rebuild logic built in, since it doesn't know
which of your packages you're expecting to be available. You can pass in
the `--package` flag, however, to tell it which packages you're expecting.
I'm not sure if I've ever tested in the exact case you're trying, so you
may have to resort to `stack build` in the directory, but `--package` is
worth a shot.

On Tue, Jul 11, 2017 at 11:29 PM, Dennis Raddle <dennis.raddle at gmail.com>

> I'm using Haskell stack in the normal way (i.e. "stack build", "stack
> exec") for most of my application. However, I also need to build files that
> aren't in the stack source tree.
> My stack source tree is at ~/stack/cac/src/
> Let's say I want to build the program /Users/Dennis/test.hs.
> So far I have been using
>    stack ghc --stack-yaml ~/stack/cac/stack.yaml -- --make
> /Users/Dennis/test.hs
> I am confused. I thought this was working until today. I made some
> modifications in various places, including to my cac.cabal (but NOT my
> stack.yaml) and I'm having a problem. The libraries that test.hs imports
> are not getting rebuilt when they change.
> Are they *supposed* to be rebuilt? Any ideas how to debug this?
> D
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