[英]OCaml - Error: Module `Unix' is unavailable
I have been working through Harvard's CS51 class using materials available online.我一直在使用在线提供的材料研究哈佛的 CS51 class。 I'm trying to start the final project and downloaded the necessary files, but when I try to compile them I get the following error:我正在尝试启动最终项目并下载必要的文件,但是当我尝试编译它们时,出现以下错误:
Error: Module `Unix' is unavailable (required by `Thread')
Command exited with code 2.
Compilation unsuccessful after building 18 targets (15 cached) in 00:00:00.
I have not made any changes to the code I downloaded yet and supposedly I should be able to compile it successfully in its current state.我还没有对我下载的代码进行任何更改,据说我应该能够在其当前的 state 中成功编译它。 Any ideas why I might be getting this error?任何想法为什么我可能会收到此错误?
Just add只需添加
open Unix;;
at the very start of your.ml file在 your.ml 文件的开头
Generally, you have to explicitly ask to be linked to the Unix
module.通常,您必须明确要求链接到Unix
模块。
The following program:以下程序:
$ cat main.ml
Unix.gethostname () |> print_endline
would need to be built like this:需要像这样构建:
$ ocamlfind opt -linkpkg -package unix -o main main.ml; echo $?
0
whereas the bare minimum would fail with a similar error as yours:而最低限度会因与您的错误类似的错误而失败:
$ ocamlopt -o main main.ml; echo $?
File "main.ml", line 1:
Error: No implementations provided for the following modules:
Unix referenced from main.cmx
2
That said, it looks like you're using Core
, in which case (as well as most other cases, actually) you're probably better off with dune
:也就是说,看起来您正在使用Core
,在这种情况下(实际上以及大多数其他情况)您可能最好使用dune
:
$ cat dune
(executable
(name main)
(libraries unix))
$ dune build main.exe
$ ./_build/default/main.exe
amam-oy
However, if you ask Dune to link you to Core
, Unix
is already included automatically, so the following dune
file would also work for the above program:但是,如果您要求 Dune 将您链接到Core
, Unix
已经自动包含在内,因此以下dune
文件也适用于上述程序:
$ cat dune
(executable
(name main)
(libraries core))
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