Red Hat Developer Toolset for CentOS 7 / RHEL 7

Software Collection (SCL) packaging of modern GCC toolchains for CentOS 7 and RHEL 7 (x86_64).

This repository provides backports for:

• devtoolset-16: GCC 16.2.1 toolchain and complete userland diagnostics suite, based on CentOS Stream 10 (EL10) gcc-toolset-16 and EL10 baseline.
• devtoolset-14: GCC 14.3.1 toolchain and complete userland diagnostics suite, based on Rocky Linux 10 (EL10).

Both toolsets are packaged to run under CentOS 7's RPM 4.11 and glibc 2.17 runtime environment.

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Toolset Overview

Feature	devtoolset-16	devtoolset-14
GCC Version	16.2.1	14.3.1
Binutils Version	2.46	2.41
Upstream Baseline	CentOS Stream 10 (gcc-toolset-16)	Rocky Linux 10 (gcc-14)
SCL Name	devtoolset-16	devtoolset-14
Installation Root	/opt/rh/devtoolset-16/root	/opt/rh/devtoolset-14/root
Environment Entry	scl enable devtoolset-16 bash	scl enable devtoolset-14 bash
Bootstrap Compiler	devtoolset-14	devtoolset-12

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Component Matrix

devtoolset-16 (EL10 Baseline)

Component	Version	Upstream SRPM	Package Name
GCC (C, C++, Fortran)	16.2.1	gcc-toolset-16-gcc-16.2.1-1.2.el10.src.rpm	devtoolset-16-gcc
Binutils	2.46	gcc-toolset-16-binutils-2.46-3.el10.src.rpm	devtoolset-16-binutils
Make	4.4.1	make-4.4.1-9.el10.src.rpm	devtoolset-16-make
Elfutils	0.194	elfutils-0.194-2.el10.rocky.0.1.src.rpm	devtoolset-16-elfutils
Strace	6.12	strace-6.12-3.el10.src.rpm	devtoolset-16-strace
Annobin	13.02	annobin-13.02-2.el10.src.rpm	devtoolset-16-annobin
DWZ	0.16	dwz-0.16-1.el10.src.rpm	devtoolset-16-dwz
Dyninst	13.0.0	dyninst-13.0.0-1.el10.src.rpm	devtoolset-16-dyninst
GDB	16.3	gdb-16.3-3.el10.src.rpm	devtoolset-16-gdb
Ltrace	0.7.91	ltrace-0.7.91-53.el10.src.rpm	devtoolset-16-ltrace
SystemTap	5.4	systemtap-5.4-3.el10.src.rpm	devtoolset-16-systemtap
Valgrind	3.26.0	valgrind-3.26.0-5.el10.src.rpm	devtoolset-16-valgrind
Metapackages	16.0	gcc-toolset-16-16.0-1.el10.src.rpm	devtoolset-16

For exact upstream SRPM hashes and Koji builds, see EL10-BASELINE.md.

devtoolset-14 (EL10 Baseline)

Component	Version	Upstream SRPM	Package Name
GCC (C, C++, Fortran)	14.3.1	gcc-14.3.1-4.4.el10.src.rpm	devtoolset-14-gcc
Binutils	2.41	binutils-2.41-63.el10.src.rpm	devtoolset-14-binutils
Make	4.4.1	make-4.4.1-9.el10.src.rpm	devtoolset-14-make
Elfutils	0.194	elfutils-0.194-2.el10.rocky.0.1.src.rpm	devtoolset-14-elfutils
Strace	6.12	strace-6.12-3.el10.src.rpm	devtoolset-14-strace
Annobin	13.02	annobin-13.02-2.el10.src.rpm	devtoolset-14-annobin
DWZ	0.16	dwz-0.16-1.el10.src.rpm	devtoolset-14-dwz
Dyninst	13.0.0	dyninst-13.0.0-1.el10.src.rpm	devtoolset-14-dyninst
GDB	16.3	gdb-16.3-3.el10.src.rpm	devtoolset-14-gdb
Ltrace	0.7.91	ltrace-0.7.91-53.el10.src.rpm	devtoolset-14-ltrace
SystemTap	5.4	systemtap-5.4-3.el10.src.rpm	devtoolset-14-systemtap
Valgrind	3.26.0	valgrind-3.26.0-5.el10.src.rpm	devtoolset-14-valgrind
Metapackages	14.1	N/A	devtoolset-14

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Installation & Usage

Setting Up the Repository

Configure the YUM repository on CentOS 7 / RHEL 7:

curl -o /etc/yum.repos.d/devtoolset-el7.repo https://el7.cooluc.com/devtoolset-el7.repo

Installing devtoolset-16

Install the complete suite via the metapackage:

yum install -y devtoolset-16

Or install core toolchain packages individually:

yum install -y devtoolset-16-gcc devtoolset-16-gcc-c++ devtoolset-16-binutils devtoolset-16-make

Enabling devtoolset-16

Enable the collection in your current shell:

scl enable devtoolset-16 bash

Verify compiler version:

gcc --version
# gcc (GCC) 16.2.1 ...

Alternatively, source the environment script directly:

source /opt/rh/devtoolset-16/enable

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Installing devtoolset-14

Install the complete suite via the metapackage:

yum install -y devtoolset-14

Or install core toolchain packages:

yum install -y devtoolset-14-gcc devtoolset-14-gcc-c++ devtoolset-14-make

Enabling devtoolset-14

Enable the collection in your current shell:

scl enable devtoolset-14 bash

Verify compiler version:

gcc --version
gcc (GCC) 14.3.1 20251022 (Red Hat 14.3.1-4)

Alternatively, source the environment script directly:

source /opt/rh/devtoolset-14/enable

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Repository Structure

.
├── .ci/
│   ├── Dockerfile.dts14        # CentOS 7 builder container for devtoolset-14
│   └── Dockerfile.dts16        # CentOS 7 builder container for devtoolset-16 (uses devtoolset-14)
├── .github/
│   └── workflows/
│       └── build.yml           # GitHub Actions CI/CD workflow (supports DTS 14 & 16)
├── devtoolset-14/              # devtoolset-14 release engineering and specs
│   ├── releng/
│   └── specs/
└── devtoolset-16/              # devtoolset-16 release engineering and specs
    ├── releng/
    │   ├── ci-common.sh        # Shared environment setup using devtoolset-14 host
    │   ├── ci-release.sh       # Release orchestration script
    │   ├── el7-compat.py       # Spec compatibility filter for RPM 4.11
    │   ├── scl-wire.py         # SCL macro injector
    │   ├── pins.env            # Upstream source tracking
    │   └── EL10-BASELINE.md    # EL10 SRPM baseline provenance
    └── specs/
        ├── binutils-el10/      # Binutils 2.46 spec and patches
        ├── gcc-el10/           # GCC 16.2.1 spec and patches
        ├── meta/               # devtoolset-16 metapackages
        └── ...                 # Full diagnostic & build tools (make, gdb, elfutils, strace, etc.)

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Building

Building with GitHub Actions

The GitHub Actions workflow (.github/workflows/build.yml) supports building both versions:

1. Tag Trigger:
   • Pushing tags matching v16* (e.g. v16.2.1) triggers the devtoolset-16 build and release.
   • Pushing tags matching v14* (e.g. v14.3.1) triggers the devtoolset-14 build and release.
2. Manual Trigger (workflow_dispatch):
   • version: Choose 16 or 14 (default 16).
   • target: release (full toolchain), deps (dependencies), gcc (GCC only), component (single component), or meta (metapackages).
   • component: Name of the component when target is set to component.
   • publish_release: Boolean flag to publish artifacts to GitHub Releases.

Building Locally with Docker

Prerequisites: Docker with access to CentOS 7 mirror repositories and el7.cooluc.com.

Build devtoolset-16

# 1. Build the builder image (pre-installs devtoolset-14)
docker build -t dts16-builder -f .ci/Dockerfile.dts16 .ci

# 2. Build the full devtoolset-16 release
docker run --rm \
  -v "$PWD:/workspace" \
  -v "$PWD/out:/out" \
  -e RELEASE_TAG=16.2.1 \
  dts16-builder bash /workspace/devtoolset-16/releng/ci-release.sh

Build devtoolset-14

# 1. Build the builder image (bootstraps with devtoolset-12)
docker build -t dts14-builder -f .ci/Dockerfile.dts14 .ci

# 2. Build the full devtoolset-14 release
docker run --rm \
  -v "$PWD:/workspace" \
  -v "$PWD/out:/out" \
  -e RELEASE_TAG=14.3.1 \
  dts14-builder bash /workspace/devtoolset-14/releng/ci-release.sh

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Technical Notes

1. Bootstrap Toolchain:
   • GCC 16 requires a modern C++ host compiler with C++17 support. devtoolset-16 utilizes devtoolset-14 as the host bootstrap compiler from https://el7.cooluc.com/devtoolset-el7.repo.
2. Single-Stage Build:
   • GCC 16 builds with --disable-bootstrap under the verified devtoolset-14 host compiler to fit execution within CI timeouts.
3. RPM 4.11 Compatibility:
   • Upstream EL10 specs utilize RPM 4.19+ constructs (%autochangelog, %autorelease, %patch -P, %patchN, boolean dependency syntax). el7-compat.py and macros.el7-compat rewrite these constructs into forms compatible with RPM 4.11.
4. SCL Isolation:
   • All files are installed under /opt/rh/devtoolset-16/root. Sanitizer runtime libraries and GCC support libraries are strictly contained within SCL library directories.