Cgo Cross-compile

Dockerfile

FROM ubuntu:latest

RUN apt-get update && apt-get install -y \
        gcc-10-aarch64-linux-gnu \
        gcc-10-multilib \
        wget

# Install Go
RUN wget -O go.tar.gz https://dl.google.com/go/go1.15.7.linux-amd64.tar.gz && \
        tar -C /usr/local -xzf go.tar.gz && \
        rm go.tar.gz
ENV PATH "/usr/local/go/bin:${PATH}"

WORKDIR /work

foo.go

package main

import "C"

//export Foo
func Foo() C.int {
        return 42
}

func main() {
}

gen.sh

docker run --rm --volume $(pwd):/work $(docker build -q .) /bin/bash -c \
  "env GOOS=linux GOARCH=arm64 \
   CGO_ENABLED=1 CC=aarch64-linux-gnu-gcc-10 \
   go build -buildmode=c-archive -o foo.a foo.go"