Image Overview: clang

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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

Download this Image

The image is available on cgr.dev:

docker pull cgr.dev/chainguard/clang:latest

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!