Compilers: Clang/LLVM, Go, Rust
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Introduction and Prerequisites
In this tutorial, you will install the Clang/LLVM 5.0 Compiler and build a simple Clang/LLVM Hello World application. This tutorial should take less than 30 minutes to complete.
Before you begin, you will need a current Red Hat Enterprise Linux 7 workstation or server subscription that allows you to download software and get updates from Red Hat. If you don’t have an active subscription, register and obtain the RHEL Developer subscription (includes RHEL server) from here.
If you encounter difficulties at any point, see Troubleshooting and FAQ.
Working with Software Collection packages
These tools are packaged as software collections which are designed to allow multiple versions of software to be installed concurrently. To accomplish this, the desired package is added to your runtime environment as needed with the
scl enable command. When
scl enable runs, it modifies environment variables and then runs the specified command. The environmental changes only affect the command that is run by
scl and any processes that are run from that command. The steps in this tutorial run the command
bash to start a new interactive shell to work in the updated environment. The changes aren’t permanent. Typing
exit will return to the original shell with the original environment. Each time you login, or start a new terminal session,
scl enable needs to be run again.
While it is possible to change the system profile to make RHSCL packages part of the system’s global environment, this is not recommended. Doing this can cause conflicts and unexpected problems with other applications because the system version of the package is obscured by having the RHSCL version in the path first.
Learn more about Red Hat Software Collections
Red Hat Software Collections deliver the latest stable versions of dynamic languages, open source databases, and web development tools that can be deployed alongside those included in Red Hat Enterprise Linux. Red Hat Software Collections is available with select Red Hat Enterprise Linux subscriptions and has a three-year life cycle to allow rapid innovation without sacrificing stability. For more information:
Red Hat Software Collections Packaging Guide — The packaging guide for Red Hat Software Collections explains the concept of software collections, documents the scl utility, and provides a detailed explanation of how to create a custom software collection or extend an existing one.
Red Hat Software Collections Release Notes — The release notes for Red Hat Software Collections document known problems, possible issues, and other important information available at the time of release of the content set. They also contain useful information on installing, rebuilding, and migrating.
How to use Red Hat Software Collections (RHSCL), Red Hat Developer Subscriptions, or Clang/LLVM, Go, Rust compilers — This article lists which Red Hat Enterprise Linux subscriptions include access to Red Hat Software Collections, Developer Toolset (with GCC), Clang/LLVM, Go, and Rust.
You can view the list of packages available in RHSCL by running:
$ yum --disablerepo="*" --enablerepo="rhel-server-rhscl-7-rpms" list available
Developing with Red Hat Enterprise Linux
Red Hat Enterprise Linux 7 Developer Guide — The developer guide for Red Hat Enterprise Linux 7 provides an introduction to application development tools and using source code management tools such as Git in Red Hat Enterprise Linux 7.
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Red Hat delivers the resources and ecosystem of experts to help you be more productive and build great solutions. Register for free at developers.redhat.com.
Troubleshooting and FAQ
As a developer, how can I get a Red Hat Enterprise Linux subscription that includes the Clang/LLVM, Go, or Rust Compilers?
Developers can get a no-cost Red Hat Enterprise Linux Developer subscription for development purposes by registering and downloading through developers.redhat.com. We recommend you follow our Getting Started Guide which covers downloading and installing Red Hat Enterprise Linux on a physical system or virtual machine (VM) using your choice of VirtualBox, VMware, Microsoft Hyper-V, or Linux KVM/Libvirt. For more information, see Frequently asked questions: no-cost Red Hat Enterprise Linux Developer subscription.
I can’t find the devtools or RHSCL repository on my system.
Some Red Hat Enterprise Linux subscriptions do not include access to Software Collections or development tools. For a list of what subscriptions are included see How to use Red Hat Software Collections (RHSCL), Red Hat Developer Toolset (DTS, etc.).
The name of the repository depends on whether you have a server or workstation version of Red Hat Enterprise Linux installed. You can use subscription-manager to view the available software repositories and verify that you have access to RHSCL and devtools:
$ su - # subscription-manager repos --list | egrep rhscl # subscription-manager repos --list | egrep devtools
When I run yum install package (go-toolset-7, llvm-toolset-7, rust-toolset-7), it fails due to a missing dependency.
Some software collections require packages that are in the devtools RPMs repository, which is not enabled by default. See Step 1 above, for how to enable both the applicable RPMs and repositories.
How can I view the Go manual pages?
The Go compiler help command provides information on its usage. To show the help index:
$ scl enable go-toolset-7 'go help'
How can I find out what RHSCL packages are installed?
scl --list will show the list of RHSCL packages that have been installed, whether they are enabled or not.
$ scl --list
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