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How to Install LLVM 6 on Ubuntu 17.04

To Install LLVM 6 on Ubuntu 17.04

LLVM is a C/C++ compiler toolset just like GCC. LLVM can compile C, C++ and Objective-C. LLVM is available on Linux, Windows and Mac OS X. So it’ s cross platform. You can either download LLVM source code and compile it yourself or download and use the pre-built binaries. It is really so simple to install LLVM on Ubuntu 17.04, and this tutorial covers the ground on the same process.

Installing LLVM 6

First go to the official website of LLVM package repository, since we use Ubuntu 17.04, so choose the following.

deb http://apt.llvm.org/zesty/ llvm-toolchain-zesty-6.0 main

Now go to the Application Menu and search for ‘ update’ . You should see something like this. Click on the “ Software & Updates” icon.

Now click on the “ Other Software” tab

Now click on “ Add” button.

Here paste the APT line that you copied a while ago from http://apt.llvm.org, and click on the Add Source button.

And give the password to complete the authentication.


And then close all the windows.

Now open a Terminal (Ctrl+Alt+T on Ubuntu) and run the following command to add the GPG key of LLVM.

root@linuxhelp:~# wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key|sudo apt-key add -
--2018-01-28 03:10:59--  https://apt.llvm.org/llvm-snapshot.gpg.key
.
.
2018-01-28 03:11:00 (12.7 MB/s) - written to stdout [3145/3145]

OK

The GPG key has been added.

Now update the package repository cache with the following command

root@linuxhelp:~# apt-get update
Ign:1 cdrom://Ubuntu 17.04 _Zesty Zapus_ - Release amd64 (20170412) zesty InRelease
Hit:2 cdrom://Ubuntu 17.04 _Zesty Zapus_ - Release amd64 (20170412) zesty Release
. 
Fetched 18.4 kB in 1s (10.1 kB/s)
Reading package lists... Done

Now you can install LLVM Clang and LLDB. To install Clang and LLDB only, run the following command:

root@linuxhelp:~# apt-get install clang-6.0 lldb-6.0 lld-6.0 
Reading package lists... Done
Building dependency tree       
.
.
Processing triggers for libc-bin (2.24-9ubuntu2.2) ...

Once the installation is complete, you can run the following command to test whether LLVM Clang is working or not.

root@linuxhelp:~# clang-6.0 --version
clang version 6.0.0-svn322567-1~exp1 (branches/release_60)
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/bin

Now lets try compiling a C program using Clang 

root@linuxhelp:~# vim test.c
#include < stdio.h> 
int main(){
        printf(" Hello World
" ) 
        return 0

Lets now compile, the output will come. 

root@linuxhelp:~# clang-6.0 test.c -0 test_c_code
root@linuxhelp:~# ./test_c_code 
Hello World

Now we have compiled and run a C program Using LLVM. With this this tutorial comes to an end.


Tag : Ubuntu
FAQ
Q
What source languages are supported in LLVM?
A
LLVM currently has full support for C and C++ source languages through Clang. Many other language frontends have been written using LLVM, and an incomplete list is available at projects with LLVM.
Q
What API do I use to store a value to one of the virtual registers in LLVM IR’s SSA representation?
A
In short: you can’t. It’s actually kind of a silly question once you grok what’s going on. Basically, in code like:

%result = add i32 %foo, %bar
Q
I have created ./test_c_code but it is not getting executed?
A
Make sure to provide executable permission for it by chmod +x test_c_code
Q
What is LLVM?
A
LLVM is a C/C++ compiler toolset just like GCC. LLVM can compile C, C++ and Objective-C. LLVM is available on Linux, Windows and Mac OS X. So it’s cross platform. You can either download LL
Q
Where to download the package from?
A
use the following deb http://apt.llvm.org/zesty/ llvm-toolchain-zesty-6.0 main