问题描述
我有一个haskell项目，默认情况下，我使用 -Werror 进行编译。这意味着，当我运行 cabal repl 时，它将在启用 -Werror 选项的情况下运行。这意味着，例如，当我评估 2 + 2 时，会收到以下错误消息：
I have a haskell project which I compile with -Werror by default. This means that when I run cabal repl it runs with the option -Werror turned on. This means that for example when I evaluate 2 + 2 I get the following error message:
<interactive>:2:3: Warning:
Defaulting the following constraint(s) to type `Integer'
(Num a0) arising from a use of `+'
In the expression: 2 + 2
In an equation for `it': it = 2 + 2
所以我需要一种方法来打开 -w 或 -Wwarn 选项 cabal repl 的默认设置。我该怎么做呢？还有 ghci 的默认标志是什么？
So I need a way to turn on the option, -w or maybe -Wwarn on by default for cabal repl. How do I do this? Also what are the default flags for ghci?
推荐答案
您可以设置〜/ .ghci 文件中的GHCi选项：
You can set GHCi options in your ~/.ghci file:
:set -w
这将覆盖< -Wall 从 cabal repl 给我。
我的理解是， ghci 默认值为 ghc ：就像没有标志地调用编译器一样。 cabal repl 从您的 .cabal 文件中获取默认值（例如 ghc-options：-Wall ），但这会被您的〜/ .ghci 文件覆盖。
My understanding is that ghci has the same defaults a ghc: it's like calling the compiler with no flags. cabal repl gets its defaults from your .cabal file (like ghc-options: -Wall), but this is overridden by your ~/.ghci file.
您还可以在项目目录中创建 .ghci 文件，并在其中具有每个项目的设置。但是，这似乎与我的全局〜/ .ghci 文件进行了尴尬的交互：添加 set -Wall 不会覆盖全局变量中的：set -w 。我不确定这种行为是故意的还是只是误解了一些。
You can also create a .ghci file in your project directory, with per-project settings there. However, this seems to interact awkwardly with my global ~/.ghci file: adding a set -Wall does not override the :set -w from the global one. I'm not sure if this behavior is intended or I'm just misunderstanding something.
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