Chainguard Container for clang

Clang is a compiler front end for the C, C++, Objective-C, and Objective-C++ programming languages, as well as the OpenMP, OpenCL, RenderScript, CUDA, SYCL, and HIP frameworks

Chainguard Containers are regularly-updated, secure-by-default container images.

Download this Container Image

For those with access, this container image is available on cgr.dev:

docker pull cgr.dev/ORGANIZATION/clang:latest

Be sure to replace the ORGANIZATION placeholder with the name used for your organization's private repository within the Chainguard Registry.

Use It!

To illustrate working with the Clang Chainguard Image, this section outlines how you can use it to compile a "Hello World!" program written in C.

To begin, run the following command to create a file named hello.c to hold the C code.

cat > /tmp/hello.c <<EOF
#include <stdio.h>

int main() {
    printf("Hello World!\n");
    return 0;
}
EOF

To simplify cleanup, this command places the file in the /tmp temporary directory.

Next, run the following docker command. This will mount the contents of your local /tmp directory (including the hello.c file) into the container's work directory. Once there, Clang will compile the C code into an executable program named hello.

docker run --rm -v /tmp:/work cgr.dev/chainguard/clang:latest hello.c -o /work/hello

The hello program will be stored back in your local /tmp directory. You can test that everything worked correctly by executing this program.

/tmp/hello

Hello World!

Be aware that, depending on your local machine's operating system, you may not be able to execute this file directly like this. This may be because the program is built with Wolfi. This creates an executable in the Executable and Linkable Format, the standard file format for Linux executables. Other systems might expect a different format; for example, this executable can't run directly on MacOS systems, which instead expect the Mach-O format. It could also be that your machine's /tmp directory was mounted with the noexec option, preventing anything stored in that directory from being executed.

If you receive an error when trying to run the hello program, you can try using another Wolfi-based image to execute it, like so.

docker run --rm -v /tmp:/work cgr.dev/chainguard/bash /work/hello

. . .
Hello World!

What are Chainguard Containers?

Chainguard's free tier of Starter container images are built with Wolfi, our minimal Linux undistro.

All other Chainguard Containers are built with Chainguard OS, Chainguard's minimal Linux operating system designed to produce container images that meet the requirements of a more secure software supply chain.

The main features of Chainguard Containers include:

• Minimal design, without unnecessary software bloat
• Daily builds to ensure container images are up-to-date with available security patches
• High quality build-time SBOMs attesting to the provenance of all artifacts within the image
• Verifiable signatures provided by Sigstore
• Reproducible builds with Cosign and apko (read more about reproducibility)

For cases where you need container images with shells and package managers to build or debug, most Chainguard Containers come paired with a development, or -dev, variant.

In all other cases, including Chainguard Containers tagged as :latest or with a specific version number, the container images include only an open-source application and its runtime dependencies. These minimal container images typically do not contain a shell or package manager.

Although the -dev container image variants have similar security features as their more minimal versions, they include additional software that is typically not necessary in production environments. We recommend using multi-stage builds to copy artifacts from the -dev variant into a more minimal production image.

Need additional packages?

To improve security, Chainguard Containers include only essential dependencies. Need more packages? Chainguard customers can use Custom Assembly to add packages, either through the Console, chainctl, or API.

To use Custom Assembly in the Chainguard Console: navigate to the image you'd like to customize in your Organization's list of images, and click on the Customize image button at the top of the page.

Learn More

Refer to our Chainguard Containers documentation on Chainguard Academy. Chainguard also offers VMs and Libraries — contact us for access.

Trademarks

This software listing is packaged by Chainguard. The trademarks set forth in this offering are owned by their respective companies, and use of them does not imply any affiliation, sponsorship, or endorsement by such companies.