Installing clang on linux

How To Install clang on Ubuntu 22.04

In this tutorial we learn how to install clang on Ubuntu 22.04.

What is clang

Clang project is a C, C++, Objective C and Objective C++ front-end for the LLVM compiler. Its goal is to offer a replacement to the GNU Compiler Collection (GCC).

Clang implements all of the ISO C++ 1998, 11 and 14 standards and also provides most of the support of C++17.

This is a dependency package providing the default clang compiler.

There are three ways to install clang on Ubuntu 22.04. We can use apt-get , apt and aptitude . In the following sections we will describe each method. You can choose one of them.

Install clang Using apt-get

Update apt database with apt-get using the following command.

After updating apt database, We can install clang using apt-get by running the following command:

sudo apt-get -y install clang 

Install clang Using apt

Update apt database with apt using the following command.

After updating apt database, We can install clang using apt by running the following command:

Install clang Using aptitude

If you want to follow this method, you might need to install aptitude first since aptitude is usually not installed by default on Ubuntu. Update apt database with aptitude using the following command.

After updating apt database, We can install clang using aptitude by running the following command:

sudo aptitude -y install clang 

How To Uninstall clang on Ubuntu 22.04

To uninstall only the clang package we can use the following command:

Uninstall clang And Its Dependencies

To uninstall clang and its dependencies that are no longer needed by Ubuntu 22.04, we can use the command below:

sudo apt-get -y autoremove clang 

Remove clang Configurations and Data

To remove clang configuration and data from Ubuntu 22.04 we can use the following command:

sudo apt-get -y purge clang 

Remove clang configuration, data, and all of its dependencies

We can use the following command to remove clang configurations, data and all of its dependencies, we can use the following command:

sudo apt-get -y autoremove --purge clang 

References

Summary

In this tutorial we learn how to install clang package on Ubuntu 22.04 using different package management tools: apt, apt-get and aptitude.

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Clang

Clang is a C/C++/Objective C/CUDA compiler based on LLVM. The most recent iteration is distributed under the «Apache 2.0 License with LLVM exceptions».

Installation

Build packages with Clang

Generic setup

To change the default compiler for building packages, edit:

. export CC=clang export CXX=clang++

To use libc++ as the C++ Standard Library instead of GCC’s libstdc++ : install the libc++ package, then add -stdlib=libc++ to CXXFLAGS in your /etc/makepkg.conf .

For LTO support: install the lld package, then add -fuse-ld=lld to LDFLAGS in your /etc/makepkg.conf .

If you are building with debug , you also need to remove -fvar-tracking-assignments from DEBUG_CFLAGS and DEBUG_CXXFLAGS , as Clang does not support it.

Note: For packages that specify GCC-specific build options, there may be build errors that require either editing the source package, the PKGBUILD or commenting out the Clang lines in makepkg.conf .

Qt packages

Qt packages may require extra setup. Qt has predefined build configurations called «mkspecs», defaulting to GCC for Linux.

In some cases, mkspec will be automatically set to linux-clang based on CC / CXX variables. But in other cases (e.g. packages with direct call of qmake ) it will not, so we can set it explicitly:

export QMAKESPEC=linux-clang

Note: Some packages will require llvm to be installed because linux-clang is configured to use tools like llvm-ar .

Using the Static Analyzer

To analyze a project, simply place the word scan-build in front of your build command. For example:

If your project is already compiled, scan-build will not rebuild and will not analyse it. To force recompilation and analysis, use -B switch:

It is also possible to analyze specific files:

Tips and tricks

This article or section needs expansion.

Reason: Describe the basic usage of ClangFormat, Clang-Tidy, and Clang-Include-Fixer. (Discuss in Talk:Clang)

Bash completion

In order to enable Bash completion, install bash-completion and source /usr/share/clang/bash-autocomplete.sh in a Bash startup file.

See also

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How To Install clang-13 on Ubuntu 22.04

In this tutorial we learn how to install clang-13 on Ubuntu 22.04.

What is clang-13

Clang project is a C, C++, Objective C and Objective C++ front-end based on the LLVM compiler. Its goal is to offer a replacement to the GNU Compiler Collection (GCC).

Clang implements all of the ISO C++ 1998, 11, 14 and 17 standards and also provides most of the support of C++20.

There are three ways to install clang-13 on Ubuntu 22.04. We can use apt-get , apt and aptitude . In the following sections we will describe each method. You can choose one of them.

Install clang-13 Using apt-get

Update apt database with apt-get using the following command.

After updating apt database, We can install clang-13 using apt-get by running the following command:

sudo apt-get -y install clang-13 

Install clang-13 Using apt

Update apt database with apt using the following command.

After updating apt database, We can install clang-13 using apt by running the following command:

sudo apt -y install clang-13 

Install clang-13 Using aptitude

If you want to follow this method, you might need to install aptitude first since aptitude is usually not installed by default on Ubuntu. Update apt database with aptitude using the following command.

After updating apt database, We can install clang-13 using aptitude by running the following command:

sudo aptitude -y install clang-13 

How To Uninstall clang-13 on Ubuntu 22.04

To uninstall only the clang-13 package we can use the following command:

sudo apt-get remove clang-13 

Uninstall clang-13 And Its Dependencies

To uninstall clang-13 and its dependencies that are no longer needed by Ubuntu 22.04, we can use the command below:

sudo apt-get -y autoremove clang-13 

Remove clang-13 Configurations and Data

To remove clang-13 configuration and data from Ubuntu 22.04 we can use the following command:

sudo apt-get -y purge clang-13 

Remove clang-13 configuration, data, and all of its dependencies

We can use the following command to remove clang-13 configurations, data and all of its dependencies, we can use the following command:

sudo apt-get -y autoremove --purge clang-13 

References

Summary

In this tutorial we learn how to install clang-13 package on Ubuntu 22.04 using different package management tools: apt, apt-get and aptitude.

Источник

How to install clang++?

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?

4 Answers 4

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

14.04

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

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.

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++ .

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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