Ubuntu – How to install LLVM/Clang 3.0

Installing llvm 3.9 can easily be done under Xenial Xerus by using the 'LLVM Debian/Ubuntu nightly packages' PPA. Just follow the steps below:

1. Add the archive signature:

   wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key | sudo apt-key add -
   

2. Add the PPA:

   sudo apt-add-repository "deb https://apt.llvm.org/xenial/ llvm-toolchain-xenial-3.9 main"
   sudo apt-get update
   

   Note: There may be some authentication warnings for the llvm key which I have safely overridden on my own system. To bypass authentication, replace sudo apt-get update with

   sudo apt -o Acquire::AllowInsecureRepositories=true update
   

3. Allow the Repository to reload and then run the following command:

   sudo apt-get install clang-3.9 lldb-3.9
   

4. Test your installation as follows, as shown on my own Xenial system:

   $ clang-3.9 --version
   clang version 3.9.0-svn275716-1~exp1 (trunk)
   Target: x86_64-pc-linux-gnu
   Thread model: posix
   InstalledDir: /usr/bin
   

References:

• LLVM Debian/Ubuntu nightly packages

It seems you can install clang 3.9 on Ubuntu 12.04.

1 - You need to add these repository to your sources.list file.

deb http://apt.llvm.org/trusty/ llvm-toolchain-trusty main
deb-src http://apt.llvm.org/trusty/ llvm-toolchain-trusty main
# 3.8 
deb http://apt.llvm.org/trusty/ llvm-toolchain-trusty-3.8 main
deb-src http://apt.llvm.org/trusty/ llvm-toolchain-trusty-3.8 main
# 3.9 
deb http://apt.llvm.org/trusty/ llvm-toolchain-trusty-3.9 main
deb-src http://apt.llvm.org/trusty/ llvm-toolchain-trusty-3.9 main

2- Then you need to add ubuntu-toolchain-r/test ppa. Because it provides updated libstdc++ required by clang 3.9

sudo add-apt-repository ppa:ubuntu-toolchain-r/test

3 - Now update the repository index

sudo apt-get update

4 - You should now be able to install clang 3.9

sudo apt-get install clang-3.9

^{Source: http://apt.llvm.org/}

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