improve makefile

Makefile

@@ -1,11 +1,37 @@
-all: linux-amd64
+CGO_ENABLED = 1
+DIR          = ./build
 
-.ONESHELL:
-linux-amd64: fmt
-	GOARCH=amd64 GOOS=linux go build  -ldflags '-s -w' -v -o build/wireguard-gui-amd64 .
+GO_ARCH_AMD	 = amd64
+GO_OS_LINUX	 = linux
+
+EXECUTABLE   = wireguard-gui
+
+BIN_LINUX_AMD64  = $(DIR)/$(EXECUTABLE)-linux-$(GO_ARCH_AMD)
+BIN_LINUX_ARM64  = $(DIR)/$(EXECUTABLE)-linux-$(GO_ARCH_ARM)
+
+CC       = go build
+LDFLAGS  = all=-w -s
+
+.PHONY: all
+all: linux
+
+.PHONY: linux
+linux: $(BIN_LINUX_AMD64)
+	chmod +x $(BIN_LINUX_AMD64)
+
+.PHONY: $(BIN_LINUX_AMD64)
+$(BIN_LINUX_AMD64):
+	GOARCH=$(GO_ARCH_AMD) \
+	GOOS=$(GO_OS_LINUX) \
+	$(CC) -ldflags="$(LDFLAGS)" \
+	-o $(BIN_LINUX_AMD64) .
+
+.PHONY: clean
+clean:
+	rm -rf $(DIR)/*
 
 tool-gofumpt:
 	which golangci-lint > /dev/null 2>&1 || go install mvdan.cc/gofumpt@latest
 
 fmt: tool-gofumpt
-	gofumpt -w --extra ./
+	gofumpt -w --extra .