[Haskell-beginners] Stack could not find libHStransformers

[Michael Snoyman]

I'm not sure how it happened, but it looks like you ended up with some
files in ~/.stack which are linked against a system-wide GHC. In particular:

Library not loaded: /usr/local/opt/ghc/lib/ghc-8.0.2/transformers-0.5.2.0/
libHStransformers-0.5.2.0-ghc8.0.2.dylib

The easiest way to fix this is to just wipe out your ~/.stack directory,
which will result in having to do some recompiles, but otherwise should be
harmless.

On Thu, Dec 7, 2017 at 7:05 PM, Quentin Liu <quentin.liu.0415 at gmail.com>
wrote:

> What does this output: `which ghc ; stack exec which ghc`
>
> `which ghc` gives "ghc not found”, while `stack exec which ghc` gives
> "/Users/HereWegoR/.stack/programs/x86_64-osx/ghc-8.0.2/bin/ghc”.
>
> What does your stack.yaml look like?
>
> For this file I don’t have any stack.yaml. I just wrote the file and tried
> to load it into ghci.
>
> Do you have a .ghci or other kinds of local configuration file?
>
> As far as I can tell, no.
>
> Regards,
> Qingbo Liu
>
> On Dec 7, 2017, 11:33 -0500, Michael Snoyman <michael at snoyman.com>, wrote:
>
> Some ideas:
>
> * What does this output: `which ghc ; stack exec which ghc`
> * What does your stack.yaml look like?
> * Do you have a .ghci or other kinds of local configuration file?
>
> On Thu, Dec 7, 2017 at 5:42 PM, Quentin Liu <quentin.liu.0415 at gmail.com>
> wrote:
>
>> I am using ghc download and managed by stack. My stack is of the latest
>> version, which is 1.6.1.
>>
>> Regards,
>> Qingbo Liu
>>
>> On Dec 7, 2017, 01:56 -0500, Michael Snoyman <michael at snoyman.com>,
>> wrote:
>>
>> What version of Stack are you using (stack --version), and how did you
>> install Stack and GHC?
>>
>> It looks like you're using a system-wide GHC installation, which (for
>> reasons like this) we by default no longer use by default in recent Stack
>> releases.
>>
>> Upgrading to the latest Stack (via `stack upgrade` or following the
>> instructions at [1]) will probably solve the problem.
>>
>> [1] https://haskell-lang.org/get-started/osx
>>
>> On Thu, Dec 7, 2017 at 8:43 AM, Quentin Liu <quentin.liu.0415 at gmail.com>
>> wrote:
>>
>>> Hi,
>>>
>>> I was trying to use Parsec and imported Text.ParserCombinators.Parsec. I
>>> could call “stack ghc” to compile the file, but when I loaded the file into
>>> ghci and called any function, ghci would report errors
>>>
>>> can't load .so/.DLL for: /Users/HereWegoR/.stack/snapsh
>>> ots/x86_64-osx/lts-8.8/8.0.2/lib/x86_64-osx-ghc-8.0.2/libHSm
>>> tl-2.2.1-BLKBelFsPB3BoFeSWSOYj6-ghc8.0.2.dylib
>>> (dlopen(/Users/HereWegoR/.stack/snapshots/x86_64-osx/lts-8.8
>>> /8.0.2/lib/x86_64-osx-ghc-8.0.2/libHSmtl-2.2.1-BLKBelFsPB3BoFeSWSOYj6-ghc8.0.2.dylib,
>>> 5): Library not loaded: /usr/local/opt/ghc/lib/ghc-8.0
>>> .2/transformers-0.5.2.0/libHStransformers-0.5.2.0-ghc8.0.2.dylib
>>>   Referenced from: /Users/HereWegoR/.stack/snapsh
>>> ots/x86_64-osx/lts-8.8/8.0.2/lib/x86_64-osx-ghc-8.0.2/libHSm
>>> tl-2.2.1-BLKBelFsPB3BoFeSWSOYj6-ghc8.0.2.dylib
>>>   Reason: image not found)
>>>
>>>
>>> I tried to install transformers by calling `stack install transformers`
>>> but the problem still persisted. Is it because the version of transformers
>>> in my repo is different from the one referenced by `mtl` package? How
>>> should I fix it?
>>>
>>> Regards,
>>> Qingbo Liu
>>>
>>> _______________________________________________
>>> Beginners mailing list
>>> Beginners at haskell.org
>>> http://mail.haskell.org/cgi-bin/mailman/listinfo/beginners
>>>
>>>
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