[Haskell-cafe] problems with "stack ghc"

Dennis Raddle dennis.raddle at gmail.com
Thu Jul 13 04:32:54 UTC 2017

Sorry if this is a basic question, but I've never tried to download and
build a Haskell project before. I've only used Haskell for small local
projects. So I'm guessing I need to get the latest source code for Stack
and build it in order to incorporate this feature?

I did try getting the source code from GitHub, but I don't know how to
build it.


On Wed, Jul 12, 2017 at 3:52 AM, Michael Snoyman <michael at snoyman.com>

> I think you'll be happy about this PR:
> https://github.com/commercialhaskell/stack/pull/3237
> On Wed, Jul 12, 2017 at 10:24 AM, Dennis Raddle <dennis.raddle at gmail.com>
> wrote:
>> --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?
>> D
>> On Tue, Jul 11, 2017 at 7:41 PM, Michael Snoyman <michael at snoyman.com>
>> wrote:
>>> 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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