How to install g++ 4.9 on Debian Wheezy armel?

问题:

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'  

回答1:

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.

回答2:

Probably-required: packaging-dev, ubuntu-dev-tools

Set up pbuilder

(this lets you build a package in a chroot without polluting your system with build-dependency packages)

sudo pbuilder create 

if you want to build for a specific distribution, (pbuilder uses the build system release in a chroot) you can use pbuilder-dist [precise/oneric/trusy/etc...] create

Get debian source

pull-debian-source gcc-4.9 [4.9.0-6]  

specific debian revision is optional, but can be useful if you want to pull experimental/unstable/testing/stable revisions you can also pull from specific ubuntu distros by adding them to sources.list as a deb-src and using sudo apt-get src

Build Package

sudo pbuilder build gcc-4.9_4.9.0-6.dsc 

In the files downloaded there is a .dsc file, for the most recent gcc it is gcc-4.9_4.9.0-6.dsc which is a package descriptor file. .orig.tar.[gz/xz] is the source tarball.

Create local Apt-repository

mkdir /convenient/place/for/repo cp /var/cache/pbuilder/result/* /path/to/repo cd /path/to/repo apt-ftp archive packages . > Packages sudo echo "deb [trusted=yes] file:/local/repo/Packages ./" > /etc/apt/sources.list.d/gcc-repo.list` 

Note you can also do this step with .debs downloaded from anywhere (skip step 1-3)

Install

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

回答3:

Instead of using the jessie packages, it would be better to check to see if it's been back-ported to wheezy. Add this to your /etc/apt/sources.list:

deb http://http.debian.net/debian wheezy-backports main

and do an apt-get update and see if you can install it then.

文章来源: How to install g++ 4.9 on Debian Wheezy armel?