add muti os bin for cross-platform

.gitignore

@@ -1,2 +1,3 @@
 dtunnel
 dtunnel_s
+/bin/

Makefile

@@ -1,20 +1,51 @@
-
-all: 
+all:
 	@make release
 release:
+	make mac
+	make linux
+	make win
+	make pi
+mac:
 	make client
 	make server
+linux:
+	make client_linux
+	make server_linux
+pi:
+	make client_pi
+	make server_pi
+win:
+	make client_win
+	make server_win
 debug:
 	make client_debug
 	make server_debug
+
 client_debug:
 	@go build -gcflags "-N -l" -o dtunnel_d client.go
 server_debug:
 	@go build -gcflags "-N -l" -o dtunnel_s_d server.go
+
+
 client:
-	@go build -ldflags "-s -w" -o dtunnel client.go
+	@go build -ldflags "-s -w" -o bin/dtunnel client.go
+client_linux:
+	@GOOS=linux GOARCH=amd64 go build -ldflags "-s -w" -o bin/linux/dtunnel client.go
+client_pi:
+	@GOOS=linux GOARCH=arm go build -ldflags "-s -w" -o bin/pi/dtunnel client.go
+client_win:
+	@GOOS=windows GOARCH=amd64 go build -ldflags "-s -w" -o bin/windows/dtunnel.exe client.go
+
+
 server:
-	@go build -ldflags "-s -w" -o dtunnel_s server.go
+	@go build -ldflags "-s -w" -o bin/dtunnel_s server.go
+server_linux:
+	@GOOS=linux GOARCH=amd64 go build -ldflags "-s -w" -o bin/linux/dtunnel_s server.go
+server_pi:
+	@GOOS=linux GOARCH=arm go build -ldflags "-s -w" -o bin/pi/dtunnel_s server.go
+server_win:
+	@GOOS=windows GOARCH=amd64 go build -ldflags "-s -w" -o bin/windows/dtunnel_s.exe server.go
+
 clean:
-	@rm -rf dtunnel dtunnel_d dtunnel_s_d dtunnel_s
+	@rm -rf bin/*
 .PHONY: all debug release client_debug server_debug client server clean