haskell - 无法定义多个可执行文件

Question

我在 app 文件夹中有两个文件

app/
|-- Main.hs
|-- SomeFunc2.hs

SomeFunc2.hs 只是打印不同的字符串

module SomeFunc2 where

import Lib

main :: IO ()
main = putStrLn "someFunc2"

当我像这样在 package.yaml 中定义多个可执行文件时

executables:
  multiexes-exe:
    main:                Main.hs
    source-dirs:         app
    ghc-options:
    - -threaded
    - -rtsopts
    - -with-rtsopts=-N
    dependencies:
    - multiexes

  somefunc2-exe:
    main:                SomeFunc2.hs
    source-dirs:         app
    ghc-options:
    - -threaded
    - -rtsopts
    - -with-rtsopts=-N
    dependencies:
    - multiexes

我收到错误:

▸ stack build
Building all executables for `multiexes' once. After a successful build of all of them, only specified executables will be rebuilt.
multiexes-0.1.0.0: configure (lib + exe)
Configuring multiexes-0.1.0.0...
multiexes-0.1.0.0: build (lib + exe)
Preprocessing library for multiexes-0.1.0.0..
Building library for multiexes-0.1.0.0..
[2 of 2] Compiling Lib              ( src/Lib.hs, .stack-work/dist/x86_64-osx/Cabal-2.0.1.0/build/Lib.o )
Preprocessing executable 'multiexes-exe' for multiexes-0.1.0.0..
Building executable 'multiexes-exe' for multiexes-0.1.0.0..
[1 of 3] Compiling Main             ( app/Main.hs, .stack-work/dist/x86_64-osx/Cabal-2.0.1.0/build/multiexes-exe/multiexes-exe-tmp/Main.o ) [Lib changed]
[3 of 3] Compiling SomeFunc2        ( app/SomeFunc2.hs, .stack-work/dist/x86_64-osx/Cabal-2.0.1.0/build/multiexes-exe/multiexes-exe-tmp/SomeFunc2.o )
Linking .stack-work/dist/x86_64-osx/Cabal-2.0.1.0/build/multiexes-exe/multiexes-exe ...
Preprocessing executable 'somefunc2-exe' for multiexes-0.1.0.0..
Building executable 'somefunc2-exe' for multiexes-0.1.0.0..
Warning: Enabling workaround for Main module 'Main' listed in 'other-modules'
illegaly!
[1 of 2] Compiling Paths_multiexes  ( .stack-work/dist/x86_64-osx/Cabal-2.0.1.0/build/somefunc2-exe/autogen/Paths_multiexes.hs, .stack-work/dist/x86_64-osx/Cabal-2.0.1.0/build/somefunc2-exe/somefunc2-exe-tmp/Paths_multiexes.o )
[2 of 2] Compiling SomeFunc2        ( app/SomeFunc2.hs, .stack-work/dist/x86_64-osx/Cabal-2.0.1.0/build/somefunc2-exe/somefunc2-exe-tmp/SomeFunc2.o )

<no location info>: error:
    output was redirected with -o, but no output will be generated
because there is no Main module.


--  While building custom Setup.hs for package multiexes-0.1.0.0 using:
      /Users/leo/.stack/setup-exe-cache/x86_64-osx/Cabal-simple_mPHDZzAJ_2.0.1.0_ghc-8.2.2 --builddir=.stack-work/dist/x86_64-osx/Cabal-2.0.1.0 build lib:multiexes exe:multiexes-exe exe:somefunc2-exe --ghc-options " -ddump-hi -ddump-to-file -fdiagnostics-color=always"
    Process exited with code: ExitFailure 1

如何解决？谢谢!

Answer 1

找到了一个解决方案，如果我为每个可执行文件创建一个文件夹并在每个文件夹中都有一个 Main.hs ，那么它就可以工作。

app/
|-- Main.hs
somefunc2/
|-- Main.hs

在 package.yaml 中，将 source-dirs 更改为这些文件夹:

executables:
  multiexes-exe:
    main:                Main.hs
    source-dirs:         app
    ghc-options:
    - -threaded
    - -rtsopts
    - -with-rtsopts=-N
    dependencies:
    - multiexes

  somefunc2-exe:
    main:                Main.hs
    source-dirs:         somefunc2
    ghc-options:
    - -threaded
    - -rtsopts
    - -with-rtsopts=-N
    dependencies:
    - multiexes