[Haskell-cafe] problems with "stack ghc"

Michael Snoyman michael at snoyman.com
Thu Jul 13 04:52:49 UTC 2017

Keep in mind that this is experimental software, so there may be rough

The code I linked to is not on master, only on a topic branch In order to
build it:

    git clone --branch exe-targets-3229 --depth=1
    cd stack
    stack install

Then make sure that you have $HOME/.local/bin on your PATH, or copy the
generated executable to wherever your stack executable currently resides.
If you have problems with the new version, you can revert with:

    stack upgrade --binary-version 1.4.0

On Thu, Jul 13, 2017 at 7:32 AM, Dennis Raddle <dennis.raddle at gmail.com>

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