[Haskell-cafe] problems with "stack ghc"

Dennis Raddle dennis.raddle at gmail.com
Wed Jul 12 07:24:29 UTC 2017

--package seems to work.

But this brings up another question. This takes a long time to run for a
change to a single file, because stack is preprocessing and building *all*
my executables, then installing them all. In my situation this is a lot of
wasted time for something that needs to be fast.

It's not just "stack ghc." I tried to get "stack build" to build a specific
executable. I tried something like "stack build cac:myExec" (my package
name is "cac") but this builds all my executables every time. I haven't
been able to find the right approach to this in the docs.

So, aside from wondering why "stack ghc" builds all my executables, how do
I use "stack build" to build just one executable?


On Tue, Jul 11, 2017 at 7:41 PM, Michael Snoyman <michael at snoyman.com>

> 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>
> wrote:
>> 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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