A simple bash script from cross compiling Go binaries by Marko Mudrinić. As found at: https://do.co/2yPiw9b

go-cross-compiler.sh

#!/usr/bin/env bash

package=$1
if [[ -z "$package" ]]; then
  echo "usage: $0 <package-name>"
  exit 1
fi
package_split=(${package//\// })
package_name=${package_split[-1]}

platforms=("linux/amd64" "linux/386" "darwin/amd64" "darwin/386")

for platform in "${platforms[@]}"
do
    platform_split=(${platform//\// })
    GOOS=${platform_split[0]}
    GOARCH=${platform_split[1]}
    output_name=$package_name'-'$GOOS'-'$GOARCH

    echo "Compiling $output_name..."
    env GOOS=$GOOS GOARCH=$GOARCH go build -o $output_name $package
    echo -e "Compilation of $output_name done.\n"
    if [ $? -ne 0 ]; then
        echo 'An error has occurred! Aborting the script execution...'
        exit 1
    fi
done