为什么堆栈不将我的ghc-options传递给编译器？ [英] Why does stack not pass my ghc-options to the compiler?

问题描述

在阴谋文件中，我指定了GHC选项 -Wall 和 -O2 ：

In the cabal file I specify the GHC options -Wall and -O2:

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

executable Test
  hs-source-dirs:   src
  main-is:          Test.hs
  build-depends:    base >=4.8 && <4.10
  ghc-options:      -Wall -O2

当我编译程序Test时.hs：

When I compile the program Test.hs:

data Color = Red | Green | Blue

foo :: Color -> Int
foo Red = 0
foo Green = 1
-- foo Blue is intentionally missing!!

我收到错误：

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

/home/user/Projekte/HaskellTutorials/Test/src/Test.hs:1:1: error:
    The IO action ‘main’ is not defined in module ‘Main’

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

关于丢失的主要动作的错误不是问题。
看第二行最后一行的文本：

The error about the missing main action is not the problem. Look at the text at the end of the second last line:

build exe：Test --ghc-options- ddump-hi -ddump-to-file

build exe:Test --ghc-options " -ddump-hi -ddump-to-file"

为什么我看不到我的GHC选项 -Wall -O2 ？ （我担心，我犯了一些愚蠢的小错误……）

Why do I not see my GHC options -Wall -O2? (I fear, I did some stupid little mistake ...)

PS：

堆栈版本为：版本1.5.1，Git修订版600c1f01435a10d127938709556c1682ecfd694e （4861次提交）x86_64 hpack-0.17.1

LTS：8.17

PS:
stack version is: Version 1.5.1, Git revision 600c1f01435a10d127938709556c1682ecfd694e (4861 commits) x86_64 hpack-0.17.1
LTS: 8.17

推荐答案

选项 -ddump-hi -ddump-to-file 正在由堆栈传递给Cabal 。 Cabal然后将它们添加到 .cabal 文件中指定的选项中，然后再将其传递到GHC。

The options -ddump-hi -ddump-to-file are being passed by Stack to Cabal. Cabal then adds them to the options specified in the .cabal file before passing them along to GHC.

使用以下命令运行堆栈：

If you run Stack with:

stack -v --cabal-verbose

并搜索输出，您会看到您的选项实际上是传递给了GHC。

and search through the output, you'll see that your options are in fact being passed to GHC.

正如@epsilonhalbe指出的那样，GHC发现缺少主要时没有抱怨更小的问题，因此，如果您添加：

As @epsilonhalbe noted, GHC isn't complaining about the more minor issues when it discovers that main is missing, so if you add:

main = undefined

在程序底部，您将收到期望的警告。

to the bottom of your program, you'll get the warnings you're expecting.

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