moby--moby/hack/make/binary

#!/bin/bash
set -e

BINARY_NAME="docker-$VERSION"
BINARY_EXTENSION="$(binary_extension)"
BINARY_FULLNAME="$BINARY_NAME$BINARY_EXTENSION"

source "${MAKEDIR}/.go-autogen"

(
if [ "$(go env GOOS)/$(go env GOARCH)" != "$(go env GOHOSTOS)/$(go env GOHOSTARCH)" ]; then
	# must be cross-compiling!
	case "$(go env GOOS)/$(go env GOARCH)" in
		windows/amd64)
			export CC=x86_64-w64-mingw32-gcc
			export CGO_ENABLED=1
			export LDFLAGS_STATIC_DOCKER="${LDFLAGS_STATIC_DOCKER/-linkmode external/-linkmode internal} -extld=${CC}"
			;;
	esac
fi

if [ "$(go env GOHOSTOS)/$(go env GOHOSTARCH)" == "windows/amd64" ] && [ "$(go env GOOS)" == "windows" ]; then
	# native compilation of Windows on Windows with golang 1.5+ needs linkmode internal
	# https://github.com/golang/go/issues/13070
	export LDFLAGS_STATIC_DOCKER="$LDFLAGS_STATIC_DOCKER -linkmode=internal"
fi

echo "Building: $DEST/$BINARY_FULLNAME"
go build \
	-o "$DEST/$BINARY_FULLNAME" \
	"${BUILDFLAGS[@]}" \
	-ldflags "
		$LDFLAGS
		$LDFLAGS_STATIC_DOCKER
	" \
	./docker
)

echo "Created binary: $DEST/$BINARY_FULLNAME"
ln -sf "$BINARY_FULLNAME" "$DEST/docker$BINARY_EXTENSION"

hash_files "$DEST/$BINARY_FULLNAME"