因为没有主模块，所以不会生成任何输出 [英] No output will be generated because there is no Main module

问题描述

我写了一个名为Test的简单模块:

I wrote a simple module called Test:

module Test (main) where

main =
  putStrLn "Hello"

但是，当我尝试通过以下命令行进行编译时:

However, when i try to compile it via the following command line:

ghc Test.hs -o my-program

我收到以下错误:

[1 of 1] Compiling Test             ( Test.hs, Test.o )

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

推荐答案

ghc将假定main位于名为Main的模块中(如编译器所说).

ghc will assume that the main is located in a module called Main (like the compiler says).

ghc但是具有选项 -main-is ，您可以在其中指定main函数所在模块的名称.因此，您可以使用以下代码进行编译:

ghc however has an option -main-is where you can specify the name of the module where the main function is located. So you can compile with:

ghc -main-is Test Test.hs -o my-program

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