如何在Debian Wheezy armel上安装g ++ 4.9？ [英] How to install g++ 4.9 on Debian Wheezy armel?

问题描述

我的Debian 7 armel嵌入式系统目前有g ++ 4.6，我想升级到g ++ 4.9以使用新的C ++ 11功能。我如何做？

我目前的sources.list内容是：

 
 
 deb http://security.debian.org/ wheezy / updates main 
 deb-src http://security.debian.org/ wheezy / updates main 
 deb http：// ftp.us.debian.org/debian wheezy主要非免费
 deb-src http://ftp.us.debian.org/debian wheezy主要非免费
 
 

一个简单的apt-get安装包不起作用：

 
 
 root @ arm：〜＃apt-get install g ++  -  4.9 
阅读包列表...完成
构建依赖关系树
阅读状态信息...完成
 E：找不到包g ++  -  4.9 
 E：找不到regex'g ++  -  4.9'
 
 

解决方案

根据这个博文。简而言之，在安装新的G ++时，您必须告诉APT使用Jessie repos。首先带来当前的Wheezy最新：

  sudo apt-get update 
 sudo apt-get upgrade 
  

然后执行备份:-)并编辑 / etc / apt / sources。列表，以便将wheezy替换为jessie：

  sudo cp /etc/apt/sources.list /etc/apt/sources.list.WHEEZY 
 sudo vi / etc /apt/sources.list 
  

现在更新软件包列表并安装4.9版本的GCC / G ++：

  sudo apt-get update 
 sudo apt-get install gcc-4.9 g ++  -  4.9 
  

此后恢复为原始包列表：

  sudo cp /etc/apt/sources.list.WHEEZY /etc/apt/sources.list 
 sudo apt-get update 
  

这将留下原始的GCC，G ++到位。如果您希望使用4.9版本进行编译，则相应地设置 CC 和 CXX env vars或调用编译器作为 gcc-4.9 或 g ++ - 4.9 明确。

My Debian 7 armel embedded system currently has g++ 4.6, and I'd like to upgrade to g++ 4.9 to use new C++11 features. How do I do that?

My current sources.list contents is:

    deb http://security.debian.org/ wheezy/updates main
    deb-src http://security.debian.org/ wheezy/updates main
    deb http://ftp.us.debian.org/debian wheezy main non-free
    deb-src http://ftp.us.debian.org/debian wheezy main non-free

A simple apt-get install of the package does not work:

    root@arm:~#  apt-get install g++-4.9
    Reading package lists... Done
    Building dependency tree
    Reading state information... Done
    E: Unable to locate package g++-4.9
    E: Couldn't find any package by regex 'g++-4.9'

解决方案

Another workaround could be to install the g++ 4.9 packages from "Jessie", according to this blog post. Briefly, you would have to tell APT to use the Jessie repos while you are installing the new G++. First bring the current Wheezy up-to-date:

sudo apt-get update
sudo apt-get upgrade

Then do a backup :-) and edit /etc/apt/sources.list so that you replace the string "wheezy" with "jessie":

sudo cp /etc/apt/sources.list /etc/apt/sources.list.WHEEZY
sudo vi /etc/apt/sources.list

Now update the package list and install the 4.9 version of GCC/G++:

sudo apt-get update
sudo apt-get install gcc-4.9 g++-4.9

After this revert to the "original" package list:

sudo cp /etc/apt/sources.list.WHEEZY /etc/apt/sources.list
sudo apt-get update

This leaves the original GCC,G++ in place. If you wish to compile with the 4.9 version, then either set the CC and CXX env vars accordingly or invoke the compilers as gcc-4.9 or g++-4.9 explicitly.

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