How to install gcc-4.8

Question

I checked the gcc version on my system.

It is currently at 4.6.3. I read that gcc-4.8 is out.

I tried the following commands without success:

sudo apt-get install gcc (gcc is already the newest version)
sudo apt-get install gcc-4.8 (unable to locate package)

Does anyone know how to install this package on 12.04?

Answer 1

Is GCC-4.8 available for 12.04 Precise now?

Update: As of 6/05/2013, there is currently a release of gcc 4.8.1 for 12.04(precise) available at https://launchpad.net/~ubuntu-toolchain-r/+archive/test.

The short answer is: gcc-4.8 is currently available for 12.04(Precise) via the toolchain PPA or by compiling the source(see below for details).

Release Announcement

The announcement for the release of gcc-4.8 was made on March 22nd, so you probably won't be seeing this in an official repository just yet.

However, it appears that Launchpad does have a PPA available for the toolchain test builds that does include gcc-4.8, here: https://launchpad.net/~ubuntu-toolchain-r/+archive/test

According to the changelog and package list, there are debs for i386, amd64, arm, and powerpc and were built against raring 13.04.

The latest available version of gcc, for 12.04, is 4.8.1 and is available in the toolchain PPA.

Adding the toolchain/test PPA:

To add the PPA to your system, open a terminal(Ctrl+Alt+t) and run the following commands:

sudo apt-get install python-software-properties
sudo add-apt-repository ppa:ubuntu-toolchain-r/test
sudo apt-get update
sudo apt-get install gcc-4.8
sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-4.8 50

You will also be prompted to install a number of suggested packages. These packages are recommended, but optional, for the installation of gcc-4.8.

• What are PPAs and how do I use them?
• Are PPA's safe to add to my system and what are some "red flags" to watch out for?

What C++ features are available in gcc-4.8 that are not available in gcc-4.7.2?

• According to GNU.ORG, gcc-4.7, supports a number of C++11 features.

• As of the gcc-4.8 release, gcc-4.7 does not support 8 out of 64 features (See C++0x/C++11 Support in GCC)

• These features are:

  Language Features
  - Rvalue references for *this
  - Generalized attributes
  - Alignment support
  - Inheriting constructors
  Concurreny
  - Bidirectional Fences
  - Memory model
  - Abandoning a process and at_quick_exit
  - Thread-local storage 
  

• For a full list of changes in gcc-4.8, see the Changelist

I need these gcc features on 12.04 Precise, now. How can I get them?

Building GCC-4.8 from source:

If you need gcc-4.8 on 12.04 now, your only option is to build it from source.

Please read the GCC installation FAQ prior to installation.

You can download gcc-4.8 from one of gnu.org's mirror sites or directly from their SVN server.

Here is an example of steps to compile from source (see here for additional details.) Note that these may vary depending on your system and preferences.

1. Download the source code

   • Make a build directory ( mkdir gcc-build && cd gcc-build)
   • Download the source file: wget http://www.netgull.com/gcc/releases/gcc-4.8.0/gcc-4.8.0.tar.bz2 (adjust this command to use an appropriate mirror site.
   • Unzip the file (tar -xvjf <file name>)

2. Install some additional libraries (sudo apt-get install libgmp-dev libmpfr-dev libmpc-dev libc6-dev)

3. Compile the source: ./gcc-4.8.0/configure --prefix=/app/gcc/4.8.0
4. Run make (This will take some time to complete. Go make some coffee, or bake some cookies. ;-))
5. Install the code: sudo make install

Once this process has completed, run the command gcc --version to verify that the installation has completed successfully. You should see something similar to the following output:

maggotbrain@foucault:~$ gcc --version
gcc (Linaro 4.8.0) 4.8.0
Copyright (C) 2013 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

The bottom line: Thank all those folks who provide easy to install Ubuntu backports for you. Give them some of the cookies that you baked while running make. ;-)

Answer 2

So answer above works, at least for manual install. Though even after sudo make install, running gcc still just runs the stock version 4.6.3. Even trying gcc-4.8 or gcc-4.8.0 doesn't work. Running /app/gcc/4.8.0/bin/gcc appears to be the only thing that works for me. I mean it is kind of lame but at least it works.