Minimal container image for building C applications (which do not require glibc).
The image is available on cgr.dev:
docker pull ghcr.io/wolfi-dev/gcc-musl:latest
To build the C application in examples/hello/main.c:
$ docker run --rm -v "${PWD}:/work" ghcr.io/wolfi-dev/gcc-musl examples/hello/main.c -o hello
This will write a Linux binary to ./hello. If you're on Linux and have the musl library, you
should be able to run it directly. Otherwise you can run it in a container e.g:
$ docker run --rm -v "$PWD/hello:/hello" ghcr.io/wolfi-dev/musl-dynamic /hello
Hello World!
We can also do this all in a multi-stage Dockerfile e.g:
FROM ghcr.io/wolfi-dev/gcc-musl as build
COPY hello.c /work/hello.c
RUN cc hello.c -o hello
FROM ghcr.io/wolfi-dev/musl-dynamic
COPY --from=build /work/hello /hello
CMD ["/hello"]And we can also compile statically to be used in environments without musl:
FROM ghcr.io/wolfi-dev/gcc-musl as build
COPY hello.c /work/hello.c
RUN cc --static hello.c -o hello
FROM cgr.dev/chainguard/static
COPY --from=build /work/hello /hello
CMD ["/hello"]