Added arm64 support

Fix arduino#203

Author: cmaglie

Diff for: arduino/cores/tools.go

@@ -24,7 +24,7 @@ import (
 	"github.com/arduino/arduino-cli/arduino/resources"
 	"github.com/arduino/go-paths-helper"
 	properties "github.com/arduino/go-properties-orderedmap"
-	"go.bug.st/relaxed-semver"
+	semver "go.bug.st/relaxed-semver"
 )
 
 // Tool represents a single Tool, part of a Package.
@@ -141,13 +141,14 @@ func (tr *ToolRelease) RuntimeProperties() *properties.Map {
 }
 
 var (
-	regexpArmLinux = regexp.MustCompile("arm.*-linux-gnueabihf")
-	regexpAmd64    = regexp.MustCompile("x86_64-.*linux-gnu")
-	regexpi386     = regexp.MustCompile("i[3456]86-.*linux-gnu")
-	regexpWindows  = regexp.MustCompile("i[3456]86-.*(mingw32|cygwin)")
-	regexpMac64Bit = regexp.MustCompile("(i[3456]86|x86_64)-apple-darwin.*")
-	regexpmac32Bit = regexp.MustCompile("i[3456]86-apple-darwin.*")
-	regexpArmBSD   = regexp.MustCompile("arm.*-freebsd[0-9]*")
+	regexpArmLinux   = regexp.MustCompile("arm.*-linux-gnueabihf")
+	regexpArm64Linux = regexp.MustCompile("(aarch64|arm64)-linux-gnu")
+	regexpAmd64      = regexp.MustCompile("x86_64-.*linux-gnu")
+	regexpi386       = regexp.MustCompile("i[3456]86-.*linux-gnu")
+	regexpWindows    = regexp.MustCompile("i[3456]86-.*(mingw32|cygwin)")
+	regexpMac64Bit   = regexp.MustCompile("(i[3456]86|x86_64)-apple-darwin.*")
+	regexpmac32Bit   = regexp.MustCompile("i[3456]86-apple-darwin.*")
+	regexpArmBSD     = regexp.MustCompile("arm.*-freebsd[0-9]*")
 )
 
 func (f *Flavor) isCompatibleWithCurrentMachine() bool {
@@ -162,6 +163,8 @@ func (f *Flavor) isCompatibleWith(osName, osArch string) bool {
 	switch osName + "," + osArch {
 	case "linux,arm", "linux,armbe":
 		return regexpArmLinux.MatchString(f.OS)
+	case "linux,arm64":
+		return regexpArm64Linux.MatchString(f.OS)
 	case "linux,amd64":
 		return regexpAmd64.MatchString(f.OS)
 	case "linux,386":

Diff for: arduino/cores/tools_test.go

@@ -34,6 +34,7 @@ func TestFlavorCompatibility(t *testing.T) {
 	linuxamd64 := &os{"linux", "amd64"}
 	linuxarm := &os{"linux", "arm"}
 	linuxarmbe := &os{"linux", "armbe"}
+	linuxarm64 := &os{"linux", "arm64"}
 	darwini386 := &os{"darwin", "386"}
 	darwinamd646 := &os{"darwin", "amd64"}
 	freebsdi386 := &os{"freebsd", "386"}
@@ -45,6 +46,7 @@ func TestFlavorCompatibility(t *testing.T) {
 		linuxamd64,
 		linuxarm,
 		linuxarmbe,
+		linuxarm64,
 		darwini386,
 		darwinamd646,
 		freebsdi386,
@@ -74,6 +76,8 @@ func TestFlavorCompatibility(t *testing.T) {
 		{&Flavor{OS: "i686-pc-linux-gnu"}, []*os{linuxi386}},
 		{&Flavor{OS: "x86_64-linux-gnu"}, []*os{linuxamd64}},
 		{&Flavor{OS: "x86_64-pc-linux-gnu"}, []*os{linuxamd64}},
+		{&Flavor{OS: "aarch64-linux-gnu"}, []*os{linuxarm64}},
+		{&Flavor{OS: "arm64-linux-gnu"}, []*os{linuxarm64}},
 	}
 
 	check := func(test *test, os *os) {