我升级了我的cabal-install吗？ [英] Have I upgraded my cabal-install?

问题描述

我刚刚从官方网站安装了Haskell。

我运行：

  cabal update 
  

显示此消息：

 从hackage.haskell.org下载最新的软件包列表
注意：有新版本的cabal-install可用。 
升级，运行：cabal install cabal-install 
  

我运行：

  cabal install cabal-install 
  

并检查更新是否成功

  cabal update 
  

结果显示，从一开始我就看到同样的讯息：

 从hackage.haskell.org下载最新软件包列表
注意：有一个新版本的cabal-install可用。 
要升级，运行：cabal install cabal-install 
  

升级cabal-install或不？如何检查我的cabal版本？ b
重要提示：我正在使用适用于Mac OS X的64位版本。 / p>在安装Haskell平台 2012.4.0.0 之后，我遇到了类似的问题。在OSX上。当我运行 cabal install cabal-install 时，它以：

  cabal：../ghc-7.4.2/lib/cabal-install-1.16.0.2/bin/cabal：不存在
  

所以我猜想它的路径混淆了某处。但是，可执行文件实际上已经成功构建（检查〜/ Library / Haskell / ghc-7.4.2 / lib / cabal-install-1.16.0.2 / bin / cabal ）和我从那里复制到〜/ Library / Haskell / bin 这是我的路径。

运行OK：

  $其中cabal 
 / Users / luke / Library / Haskell / bin / cabal 
 $ cabal update 
从hackage.haskell.org下载最新软件包列表
 $ cabal --version 
 cabal-install版本1.16.0.2 
使用Cabal版本1.16.0.3库
  

I just installed Haskell from it's official site. After that, following it's quick-start tutorial.

I run:

cabal update

Which shows this message:

Downloading the latest package list from hackage.haskell.org
Note: there is a new version of cabal-install available.
To upgrade, run: cabal install cabal-install

I run:

cabal install cabal-install

and check if the update was successful with

cabal update

The result, it shows me the same message from the start:

Downloading the latest package list from hackage.haskell.org
Note: there is a new version of cabal-install available.
To upgrade, run: cabal install cabal-install

So, did I upgrade the cabal-install or not? How do I check my cabal's version?

Important: I'm using the 64 bits version for Mac OS X.

解决方案

I had a similar issue after installing the Haskell platform 2012.4.0.0 on OSX. When I ran cabal install cabal-install, it ended with:

cabal: ../ghc-7.4.2/lib/cabal-install-1.16.0.2/bin/cabal: does not exist

So I guessed it got its paths mixed up somewhere. However the executable was actually built successfully (check for ~/Library/Haskell/ghc-7.4.2/lib/cabal-install-1.16.0.2/bin/cabal) and I just copied it from there to ~/Library/Haskell/bin which is on my path.

Thereafter everything ran OK:

$ which cabal
/Users/luke/Library/Haskell/bin/cabal
$ cabal update
Downloading the latest package list from hackage.haskell.org
$ cabal --version
cabal-install version 1.16.0.2
using version 1.16.0.3 of the Cabal library

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