How to compile an executable from Haskell Stack build?

Question

|-aseCswk2
  |-app
    |-Main.hs
  |-src
    |-Libs.hs
  |-test
    |-Spec.hs
  |-aseCswk2.cabal
  |-Setup.hs
  |-package.yaml
...

So i have a Haskell project that uses a Stack build system and is laid out as the example above. If i use $ stack test then my functions in my Libs.hs file are tested with the cases in my Spec.hs file. If i use $ stack build then my file builds successfully and i can use the functions inside $ stack ghci.

However, i want to create an executable of the my Main.hs file but don't know how this is possible. I have tried compiling it using $ ghc Main.hs inside the app directory but get an error saying 'Failed to load interface for Lib' even though i have included it as an import. I have also tried $stack build aseCswk2:exe:aseCswk2-exe but no .o files are created to run.

You can run the program with stack run. The files are constructed, in a hidden directory named .stack-world. — willeM_ Van Onsem
– willeM_ Van Onsem, Commented May 22, 2020 at 13:56
if you for example run stack build it prints at the last line the location of the executable. — willeM_ Van Onsem
– willeM_ Van Onsem, Commented May 22, 2020 at 15:42

willeM_ Van Onsem · Accepted Answer · 2020-05-22 16:40:47Z

6

Haskell-stack builds the executable in the hidden .stack-work directory. You can find out where the binaries are located that stack uses with:

$ stack path --local-install-root
/haskell/app/.stack-work/install/x86_64-linux/3fa5b3c3fbcd473981eef72c68d572129654cbb7c23af146b50d90e29c41b62f/8.6.5

In this directory, there is, if you build the application, a bin/ directory where the binary is located that has been built.

You can also run the application with:

$ stack run

answered May 22, 2020 at 16:40

willeM_ Van Onsem

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2 Comments

exchange Over a year ago

This command is not described in the introductory documentation of stack here: docs.haskellstack.org/en/stable/GUIDE Is there a way to change that? Or where to request the change?

Code-Apprentice Over a year ago

@exchange stack path is documented in the advanced reference: docs.haskellstack.org/en/stable/path_command

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