@@ -80,6 +80,7 @@ case "$(go env GOOS)/$(go env GOARCH)" in

 esac

 echo "Building: $DEST/$BINARY_FULLNAME"

+echo "GOOS=\"${GOOS}\" GOARCH=\"${GOARCH}\" GOARM=\"${GOARM}\""

 go build \

 	-o "$DEST/$BINARY_FULLNAME" \

 	"${BUILDFLAGS[@]}" \

@@ -18,8 +18,14 @@ for platform in ${DOCKER_CROSSPLATFORMS}; do

 	(

 		export KEEPDEST=1

 		export DEST="${DEST}/${platform}" # bundles/VERSION/cross/GOOS/GOARCH/docker-VERSION

-		export GOOS=${platform%/*}

-		export GOARCH=${platform##*/}

+		export GOOS=${platform%%/*}

+		export GOARCH=${platform#*/}

+

+		if [[ "${GOARCH}" = "arm/"* ]]; then

+			GOARM=${GOARCH##*/v}

+			GOARCH=${GOARCH%/v*}

+			export GOARM

+		fi

 		echo "Cross building: ${DEST}"

 		mkdir -p "${DEST}"

@@ -233,6 +233,27 @@ following:

 This will create "./bundles/$VERSION/dynbinary-client/docker-$VERSION", which for

 client-only builds is the important file to grab and install as appropriate.

+### Cross Compilation

+

+Limited cross compilation is supported due to requiring cgo for critical

+functionality (such as seccomp support).

+

+To cross compile run `make cross`. You can specify the platforms to target by

+setting the `DOCKER_CROSSPLATFORMS` environment variable to a list of platforms

+in the format `<GOOS>/<GOARCH>`. Specify multiple platforms by using a space

+in between each desired platform.

+

+For setting arm variants, you can specify the `GOARM` value by append `/v<GOARM>`

+to your `<GOOS>/arm`. Example:

+

+```

+make DOCKER_CROSSPLATFORMS=linux/arm/v7 cross

+```

+

+This will create a linux binary targeting arm 7.

+

+See `hack/make/.binary` for supported cross compliation platforms.

+

 ## System Dependencies

 ### Runtime Dependencies