gcc docker image from scratch

Dockerfile

FROM alpine AS builder
RUN apk add --no-cache build-base
RUN printf '#include <stdio.h>\nint main() {printf("Hello Container!\\n"); return 0;}\n' > main.c
RUN gcc -o main main.c -static

FROM scratch
COPY --from=builder main .
CMD ["./main"]

verysmall.Dockerfile

FROM alpine AS builder
RUN apk add --no-cache curl xz build-base
RUN cd /usr/local/bin && curl -sSLo- https://github.com/upx/upx/releases/download/v4.2.4/upx-4.2.4-amd64_linux.tar.xz | tar -Jxvf- --strip-components=1 upx-4.2.4-amd64_linux/upx
RUN printf '#include <unistd.h>\nvoid _start(void){write(1,"Hello world!", 12);_exit(0);}' > main.c
RUN gcc -nostartfiles -o main main.c -s -static
RUN upx --best --brute main

FROM scratch
COPY --from=builder main .
CMD ["./main"]