Haskell-ide-engine: Document solution to: DYLD iconv is not found on mac os x

[kubum]

Hi everyone,

I attempt to install the master hie with make build-all and everything builds perfectly fine. When I start an editor HIE has no errors

```2018-12-21 15:13:22.903258 [ThreadId 4] - run entered for hie-wrapper(hie-wrapper) Version 0.4.0.1, Git revision 91ec5a0d3e6e35771a3033c99258e24da549c3f2 (2271 commits) x86_64 ghc-8.2.1
2018-12-21 15:13:22.910874 [ThreadId 4] - Current directory:/Users/andreyfadeyev/Sites/github/liquidhaskell
2018-12-21 15:13:23.189327 [ThreadId 4] - Cradle directory:/Users/andreyfadeyev/Sites/github/liquidhaskell
2018-12-21 15:13:23.190092 [ThreadId 4] - Using stack GHC version
2018-12-21 15:13:23.451878 [ThreadId 4] - Project GHC version:8.4.3
2018-12-21 15:13:23.452753 [ThreadId 4] - hie exe candidates :["hie-8.4.3","hie-8.4","hie"]
2018-12-21 15:13:23.457252 [ThreadId 4] - found hie exe at:/Users/andreyfadeyev/.local/bin/hie-8.4.3
2018-12-21 15:13:23.458101 [ThreadId 4] - args:[]
2018-12-21 15:13:23.45864 [ThreadId 4] - launching ....

2018-12-21 15:13:23.537874 [ThreadId 4] - Using stack GHC version
2018-12-21 15:13:23.807754 [ThreadId 4] - Run entered for HIE(hie-8.4.3) Version 0.4.0.1, Git revision b08c30b5ab825cafcf47ff5ede02fe7dcad10b83 (dirty) (2282 commits) x86_64 ghc-8.4.3
2018-12-21 15:13:23.811813 [ThreadId 4] - Current directory:/Users/andreyfadeyev/Sites/github/liquidhaskell
2018-12-21 15:13:Using hie version: Version 0.4.0.1, Git revision b08c30b5ab825cafcf47ff5ede02fe7dcad10b83 (dirty) (2282 commits) x86_64 ghc-8.4.3
24.447375 [ThreadId 13] - Using stack GHC version
Using hoogle db at: /Users/andreyfadeyev/.hoogle/default-haskell-5.0.17.hoo

However, the editor says:

Got error while processing diagnostics: : can't load .so/.DLL for: libiconv.dylib (dlopen(libiconv.dylib, 5): image not found)

I edited `stack.yaml` to provide the exact paths with dyld and `stack install` again

extra-lib-dirs:

• /usr/local/opt/libiconv/lib
• /usr/lib
• /usr/local/lib

extra-include-dirs:

• /usr/local/opt/libiconv/include
  ```

However, it has made no difference.

If I override export DYLD_LIBRARY_PATH=$DYLD_LIBRARY_PATH:/usr/local/lib it breaks stack.
The macOS - 10.13.6
I am on the latest master - b08c30b5ab825cafcf47ff5ede02fe7dcad10b83

The most related issue I found is #744, but it is not exactly that.

I wonder where could be the issue? and what could be wrong with my setup?

Thank you!

[kubum]

The solution end up to be simple

Add /usr/local/lib to DYLD_LIBRARY_PATH

export DYLD_LIBRARY_PATH="$DYLD_LIBRARY_PATH:/usr/lib:/usr/local/lib"

After DYLD_LIBRARY_PATH is changed stack and other app might get broken with dyld: Symbol not found: __cg_jpeg_resync_to_restart

Unlink

$ brew unlink libjpeg
$ brew unlink libtiff
$ brew unlink libpng

Recompile projects

[alanz]

I guess we need to add this to the README

[kubum]

Hi @alanz! I can add this shortly, I am not sure if it is just my setup after years end up to be perculiar or is it something that might help others, either way - let me know, I can submit a PR.

[alanz]

@kubum if you hit the problem, others will too. So if you just add something saying "if on macos you hit ...., then do ...."

And a PR would be great.

[kubum]

Hi @alanz, I just created a PR #1025, please let me know what you think when you have time.