Crossbuilding of functions only supported on AMD64 (elastic#23999)

x-pack/functionbeat/magefile.go

@@ -10,6 +10,7 @@ import (
 	"fmt"
 	"os"
 	"path/filepath"
+	"runtime"
 	"time"
 
 	"github.com/magefile/mage/mg"
@@ -89,6 +90,7 @@ func BuildGoDaemon() error {
 
 // CrossBuild cross-builds the beat for all target platforms.
 func CrossBuild() error {
+
 	// Building functionbeat manager
 	err := devtools.CrossBuild()
 	if err != nil {
@@ -107,6 +109,11 @@ func CrossBuild() error {
 			continue
 		}
 
+		if runtime.GOARCH != "amd64" {
+			fmt.Println("Crossbuilding functions only works on amd64 architecture.")
+			return nil
+		}
+
 		err := devtools.CrossBuild(devtools.AddPlatforms("linux/amd64"), devtools.InDir("x-pack", "functionbeat", "provider", provider.Name))
 		if err != nil {
 			return err