I have a project (let's call it parent) that has a sub-package (child). Using HLS from emacs, whenever I change a file in the parent that imports part of the child package, and try to load it, GHCI will recompile the whole sub-package again every time. The sub-package has lots of TH code in it and takes a long time to compile, which really messes with your workflow when you just want to check if something works. Any ideas?
I'm using
My stack.yaml in the parent package:
resolver: lts-18.28
packages:
- .
- sub-package
extra-deps:
- ... (omitted)
allow-newer: true
EDIT: Minimal example: git repo
file details:
parent stack.yaml
resolver: lts-18.28
packages:
- .
- child
child stack.yaml
resolver: lts-18.28
packages:
- .
parent main src/Parent.hs:
module Parent where
import Child
someFunc :: IO ()
someFunc = childFunc
child main file child/src/Child.hs:
module Child where
childFunc :: IO ()
childFunc = putStrLn "someFunc"
Turns out adding -fobject-code to the .ghci file causes ghci to create object files, which in turn saves it the trouble of recompiling everything every time.