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Chapter 1. LLVM Toolset

LLVM Toolset is a Red Hat offering for developers on Red Hat Enterprise Linux (RHEL). It provides the LLVM compiler infrastructure framework, the Clang compiler for the C and C++ languages, the LLDB debugger, and related tools for code analysis.

LLVM Toolset is distributed as a part of Red Hat Developer Tools for Red Hat Enterprise Linux 7. For Red Hat Enterprise Linux 8, LLVM Toolset is available as a module. LLVM Toolset is available as packages for Red Hat Enterprise Linux 9.

1.1. LLVM Toolset components
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The following components are available as a part of LLVM Toolset:

Expand
NameVersionDescription

clang

15.0.7

An LLVM compiler front end for C and C++.

lldb

15.0.7

A C and C++ debugger using portions of LLVM.

compiler-rt

15.0.7

Runtime libraries for LLVM and Clang.

llvm

15.0.7

A collection of modular and reusable compiler and toolchain technologies.

libomp

15.0.7

A library for using Open MP API specification for parallel programming.

lld

15.0.7

An LLVM linker.

python-lit

15.0.7

A software testing tool for LLVM- and Clang-based test suites.

Note

The CMake build manager is not part of LLVM Toolset. On Red Hat Enterprise Linux 7, CMake is provided as a separate package. On Red Hat Enterprise Linux 8, CMake is available in the system repository. On Red Hat Enterprise Linux 9, CMake is available in the system repository. For more information on how to install CMake, see Installing CMake on Red Hat Enterprise Linux.

1.2. LLVM Toolset compatibility
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LLVM Toolset is available for Red Hat Enterprise Linux 7 and Red Hat Enterprise Linux 8 and Red Hat Enterprise Linux 9 on the following architectures:

  • AMD and Intel 64-bit
  • 64-bit ARM (RHEL 8 and RHEL 9)
  • IBM Power Systems, Little Endian
  • IBM Power Systems, Big Endian (Only RHEL 7)
  • 64-bit IBM Z

To be able to install LLVM Toolset on Red Hat Enterprise Linux 7, you must access and enable Red Hat Developer Tools and Red Hat Software Collections repositories.
If these repositories are already attached to your system, see Installing LLVM Toolset.

Procedure

  1. Install Wget by running: 

    # yum install wget
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  2. Download the latest subscription data by running: 

    # subscription-manager refresh
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  3. Register your system by running: 

    # subscription-manager register
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    To register your system using a graphical user interface (GUI), follow the Registering and Unregistering a System guide.

  4. Display a list of all available subscriptions and identify the pool ID by running: 

    # subscription-manager list --available
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  5. Find the pool ID on the line beginning with Pool ID.

  6. Attach the subscription that provides access to the Red Hat Developer Tools repository to your system by running: 

    # subscription-manager attach --pool=<pool ID from the subscription>
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    • Replace <pool ID from the subscription> with the pool ID you identified in the previous step.

  7. Verify which subscriptions are attached to your system by running: 

    # sudo subscription-manager list --consumed
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  8. Enable the rhel-7-variant-devtools-rpms repository by running: 

    # subscription-manager repos --enable rhel-7-<variant>-devtools-rpms
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    • Replace <variant> with your Red Hat Enterprise Linux system variant: server or workstation.

      Use server to access the widest range of development tools.

  9. Enable the rhel-variant-rhscl-7-rpms repository by running: 

    # subscription-manager repos --enable rhel-<variant>-rhscl-7-rpms
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    • Replace <variant> with your Red Hat Enterprise Linux system variant: server or workstation.

  10. Add the Red Hat Developer Tools GPG key to your system by running: 

    # cd /etc/pki/rpm-gpg
# wget -O RPM-GPG-KEY-redhat-devel https://www.redhat.com/security/data/a5787476.txt
# rpm --import RPM-GPG-KEY-redhat-devel
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1.4. Installing LLVM Toolset
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Complete the following steps to install LLVM Toolset including all development and debugging tools as well as dependent packages.

Prerequisites

Procedure

On Red Hat Enterprise Linux 7, install the llvm-toolset-15.0 collection by running: 

# yum install llvm-toolset-15.0
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Important

This does not install the LLDB debugger on Red Hat Enterprise Linux 7. To install the LLDB debugger, run: 

# yum install llvm-toolset-15.0-lldb
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On Red Hat Enterprise Linux 8, install the llvm-toolset module by running: 

# yum module install llvm-toolset
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Important

This does not install the LLDB debugger or the python3-lit package on Red Hat Enterprise Linux 8. To install the LLDB debugger and the python3-lit package, run: 

# yum install lldb python3-lit
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On Red Hat Enterprise Linux 9, install the llvm-toolset package by running: 

# dnf install llvm-toolset
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Important

This does not install the LLDB debugger or the python3-lit package on Red Hat Enterprise Linux 9. To install the LLDB debugger and the python3-lit package, run: 

# dnf install lldb python3-lit
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1.5. Installing the CMake build manager
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The CMake build manager is a tool that manages the build process of your source code independently from your compiler. CMake can generate a native build environment to compile source code, create libraries, generate wrappers, and build executable files.
Complete the following steps to install the CMake build manager.

Prerequisites

Procedure

To install CMake, run the following command:

  • On Red Hat Enterprise Linux 7: 
# yum install llvm-toolset-15.0-cmake
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  • On Red Hat Enterprise Linux 8: 
# yum install cmake
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  • On Red Hat Enterprise Linux 9: 
# dnf install cmake
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Additional resources

  • For more information on the CMake build manager, see the official CMake documentation overview About CMake.

  • For an introduction to using the CMake build manager, see:

1.6. Installing LLVM Toolset documentation
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You can install documentation for LLVM Toolset on your local system.

Prerequisites

Procedure

To install the llvm-doc package, run the following command:

  • On Red Hat Enterprise Linux 7: 

    # yum install llvm-toolset-15.0-llvm-doc
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    You can find the documentation under the following path: /opt/rh/llvm-toolset-15.0/root/usr/share/doc/llvm-toolset-15.0-llvm-15.0.7/html/index.html.

  • On Red Hat Enterprise Linux 8: 

    # yum install llvm-doc
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    You can find the documentation under the following path: /usr/share/doc/llvm/html/index.html.

  • On Red Hat Enterprise Linux 9: 

    # dnf install llvm-doc
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    You can find the documentation under the following path: /usr/share/doc/llvm/html/index.html.

1.7. Installing CMake documentation
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You can install documentation for the CMake build manager on your local system.

Prerequisites

Procedure

To install the cmake-doc package, run the following command:

  • On Red Hat Enterprise Linux 7: 

    # yum install llvm-toolset-15.0-cmake-doc
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    You can find the documentation under the following path: opt/rh/llvm-toolset-15.0/root/usr/share/doc/llvm-toolset-15.0-cmake-3.18.2/html/index.html.

  • On Red Hat Enterprise Linux 8: 

    # yum install cmake-doc
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    You can find the documentation under the following path: /usr/share/doc/cmake/html/index.html.

  • On Red Hat Enterprise Linux 9: 

    # dnf install cmake-doc
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    You can find the documentation under the following path: /usr/share/doc/cmake/html/index.html.

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