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I'm having trouble getting clang++ to work as I compile my code. Specifically, I'm getting a make: clang++: Command not found error.

I've run sudo apt-get install llvm, and also sudo apt-get install build-essential and sudo apt-get update. What do I have to do to get clang++ installed?

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Installing the llvm and build-essential packages, as you have done, does not cause clang or clang++ to be installed. For that, you must install one of the clang packages, depending on which version of clang and clang++ you want.

16.04

In Ubuntu 16.04, your options are clang-3.5, clang-3.6, clang-3.7, and clang-3.8.

14.04

In Ubuntu 14.04, your options are clang-3.3 Install clang-3.3, clang-3.4 Install clang-3.4, and clang-3.5 Install clang-3.5.

You can install them in the Software Center, or with:

sudo apt-get update
sudo apt-get install clang-3.n

(Replacing n with the desired sub-version, of course.)

12.04

If you're running Ubuntu 12.04, there's only one package that provides clang and clang++, so it's just called clang Install clang.

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  • is there a chance to install clang from source without sudo? after making and make check-all, i tried to use make install, but lots of permission denied appeared. – Amir Nov 8 '14 at 21:59
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    clang-3.6 is available on their download page for ubuntu 14.04: llvm.org/releases/3.6.0/… – David 天宇 Wong Apr 10 '15 at 16:10
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    With 14.04 (trusty-updates), clang-3.6 is also available. – Josh Milthorpe Jul 25 '16 at 14:35
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    At least for me, on 14.04 with clang-3.8 installed, I added a soft link for clang++ (by default, I only had /usr/bin/clang++-3.8). For example: sudo ln -s /usr/bin/clang++-3.8 /usr/bin/clang++. – rkersh Jan 27 '17 at 17:34
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    Can we get a more updated version of this answer? – Nathan Jun 15 '18 at 5:40
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18.04 (Bionic)

I visited http://apt.llvm.org/bionic/dists/ (i.e. bionic distributions).
I determined that 6.0 was the latest major version of the toolchain.

I assume that you'll want the linker, lld, also.

# grab the key that LLVM use to GPG-sign binary distributions
wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key | sudo apt-key add -
sudo apt-get update
sudo apt-add-repository "deb http://apt.llvm.org/bionic/ llvm-toolchain-bionic-6.0 main"
sudo apt-get install -y clang-6.0 lld-6.0

This gives you binaries with the following names (and more, probably):

clang-6.0
clang++-6.0
lld-6.0
ld.lld-6.0

It also installs these packages (and more):

llvm-6.0
llvm-6.0-dev
llvm-6.0-runtime

17.04 (Artful)

Same as above. I'll repeat every line for convenient copy-paste.

# grab the key that LLVM use to GPG-sign binary distributions
wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key | sudo apt-key add -
sudo apt-get update
sudo apt-add-repository "deb http://apt.llvm.org/artful/ llvm-toolchain-artful-6.0 main"
sudo apt-get install -y clang-6.0 lld-6.0

16.04 (Xenial)

The accepted answer already gives instructions for installing clang-3.8 on 16.04, but here's how to get clang-6.0:

# grab the key that LLVM use to GPG-sign binary distributions
wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key | sudo apt-key add -
sudo apt-get update
sudo apt-add-repository "deb http://apt.llvm.org/xenial/ llvm-toolchain-xenial-6.0 main"
sudo apt-get install -y clang-6.0 lld-6.0
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Before proceeding it will be worthwhile to update package information using sudo apt-get update

Installing Clang 9 on Ubuntu 18

sudo apt-get install clang-tools-9

It will also install llvm-9

For more information follow clang documentation.

Installing Clang 10 on Ubuntu 18

sudo apt-get install clang-tools-10

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