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stack build doesn't include MinGW bin folder where some DLLs reside (like http-client package) #3126

varosi opened this issue Apr 14, 2017 · 3 comments


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@varosi varosi commented Apr 14, 2017

General summary/comments (optional)

Steps to reproduce

  1. Clone http-client package from Hackage under Windows
  2. Using Stack's MinGW64 run: pacman -S mingw-w64-x86_64-openssl
  3. Run command stack build.


Expected to find eay32.dll which is installed using Stack's MingGW64.


stack build -v output

--extra-include-dirs=C:\Users\MyUser\AppData\Local\Programs\stack\x86_64-windows\msys2-20150512\mingw64\include --extra-lib-dirs=C:\Users\MyUser\AppData\Local\Programs\stack\x86_64-windows\msys2-20150512\mingw64\lib

There is no \bin folder included in extra-lib-dirs. And it cannot find OpenSSL libraries which are compiled and deployed by MinGW64 into \bin folder. When I add:

- C:\Users\MyUser\AppData\Local\Programs\stack\x86_64-windows\msys2-20150512\mingw64\bin

to .yaml file - it finds it. But I think that it'll be useful if this folder is added automatically by Stack. So every library built with Stack's MinGW to be accessible for Haskell projects built with Stack.

Stack version

Version 1.4.0, Git revision e714f1dd3fade19496d91bd6a017e435a96a6bcd x86_64 hpack-0.17.0

Method of installation

  • Official binary, downloaded from or fpcomplete's package repository
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@mgsloan mgsloan commented Apr 23, 2017

I'm surprised that mingw would put dlls in bin and not lib (though I am not very experienced with mingw). A quick search turned up this old page on mingw: - and bin isn't among the library search paths.

I'm certainly in favor of streamlining such things, but I'm puzzled why it's necessary. Seems like it shouldn't cause much harm, though, so if it helps some cases I'm in favor of adding it. Here's where it would be added:

@mgsloan mgsloan added this to the P2: Should milestone Apr 23, 2017
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@varosi varosi commented Apr 24, 2017

Thanks for the guidance! I'll find some time to fix it soon.

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@varosi varosi commented May 29, 2017


@varosi varosi closed this May 29, 2017
mgsloan added a commit that referenced this issue Jun 11, 2017
#3126 Use MinGW bin folder for dynamic libraries searching
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