Question

我有similar setup like this SO question。但是，我正在使用 stack 而不是直接使用 cabal ：

stack.yaml
Test.cabal
src/FirstExe
src/SecondExe

堆栈文件很小

resolver: lts-8.17
packages:
- '.'

文件 Test.cabal 有2个可执行文件：

name:               Test
version:            0.1.0.0
build-type:         Simple
cabal-version:      >=1.8

executable FirstExe
  hs-source-dirs:   src
  main-is:          FirstExe.hs
  build-depends:    base >=4.8 && <4.10

executable SecondExe
  hs-source-dirs:   src
  main-is:          SecondExe.hs
  build-depends:    base >=4.8 && <4.10

src / FirstExe.hs 成功编译：

main :: IO ()
main = putStrLn "FirstExe compiles nicely"

src / SecondExe.hs 有错误：

main :: IO ()
main = "SecondExe gives compiler error"  -- putStrLn is missing ...

（注意：此错误的目标是在堆栈构建 SecondExe 时看到。）

当我做stack ide targets时，我得到了

Test:exe:FirstExe
Test:exe:SecondExe

现在我想编译仅第一个目标 FirstExe 而不编译第二个目标而不更改 Test.cabal 文件。实际上，我将在2个可执行文件之间切换。

根据Haskell Tool Stack documentation它应该可能

我尝试了两种可能性：

stack build  :FirstExe
stack build Test:exe:FirstExe

在这两种情况下，它也会编译第二个可执行文件！

Test-0.1.0.0: configure (exe)
Configuring Test-0.1.0.0...
Test-0.1.0.0: build (exe)
Preprocessing executable 'FirstExe' for Test-0.1.0.0...
Preprocessing executable 'SecondExe' for Test-0.1.0.0...
[1 of 1] Compiling Main             ( src/SecondExe.hs, .stack-work/dist/x86_64-linux-nopie/Cabal-1.24.2.0/build/SecondExe/SecondExe-tmp/Main.o )

/home/roland/Projekte/HaskellTutorials/Test/src/SecondExe.hs:2:8: error:
    * Couldn't match expected type `IO ()' with actual type `[Char]'
    * In the expression: "SecondExe gives compiler error"
      In an equation for `main': main = "SecondExe gives compiler error"

--  While building package Test-0.1.0.0 using:
      /home/roland/.stack/setup-exe-cache/x86_64-linux-nopie/Cabal-simple_mPHDZzAJ_1.24.2.0_ghc-8.0.2 --builddir=.stack-work/dist/x86_64-linux-nopie/Cabal-1.24.2.0 build exe:FirstExe exe:SecondExe --ghc-options " -ddump-hi -ddump-to-file"
    Process exited with code: ExitFailure 1

我做错了什么？

仅编译具有cabal文件中多个目标的堆栈项目中的一个目标

0 个答案: