Library mode (external main) now can be enabled with build flag

Makefile

@@ -18,12 +18,12 @@ server:
 
 client-dynlib: 
 	mkdir -p build
-	go build -ldflags "-X main.version=${version}" -buildmode=c-shared -o libck-client.so ./cmd/ck-client 
+	go build -ldflags "-X main.version=${version}" -buildmode=c-shared -tags=external_main -o libck-client.so ./cmd/ck-client 
 	mv libck-client* ./build
 
 server-dynlib: 
 	mkdir -p build
-	go build -ldflags "-X main.version=${version}" -buildmode=c-shared -o libck-server.so ./cmd/ck-server 
+	go build -ldflags "-X main.version=${version}" -buildmode=c-shared -tags=external_main -o libck-server.so ./cmd/ck-server 
 	mv libck-server* ./build
 
 install:

cmd/ck-client/ck-client.go

@@ -10,8 +10,6 @@ import (
 	"fmt"
 	"net"
 	"os"
-	"C"
-	"unsafe"
 
 	"github.com/cbeuw/Cloak/internal/common"
 
@@ -20,19 +18,6 @@ import (
 	log "github.com/sirupsen/logrus"
 )
 
-//export external_main
-func external_main(argc C.int, argv **C.char) {
-	var offset = unsafe.Sizeof(uintptr(0))
-	var go_argv []string
-	for i := 0; i < int(argc); i++ {
-		go_argv = append(go_argv, C.GoString(*argv))
-		argv = (**C.char)(unsafe.Pointer(uintptr(unsafe.Pointer(argv)) + offset))
-	}
-
-	os.Args = go_argv
-	main()
-}
-
 var version string
 
 func main() {

cmd/ck-client/external-main.go

@@ -0,0 +1,23 @@
+//go:build external_main
+// +build external_main
+
+package main
+
+import (
+	"os"
+        "C"
+        "unsafe"
+)
+
+//export external_main
+func external_main(argc C.int, argv **C.char) {
+        var offset = unsafe.Sizeof(uintptr(0))
+        var go_argv []string
+        for i := 0; i < int(argc); i++ {
+                go_argv = append(go_argv, C.GoString(*argv))
+                argv = (**C.char)(unsafe.Pointer(uintptr(unsafe.Pointer(argv)) + offset))
+        }
+
+        os.Args = go_argv
+        main()
+}

cmd/ck-server/ck-server.go

@@ -9,8 +9,6 @@ import (
 	"os"
 	"runtime"
 	"strings"
-	"C"
-	"unsafe"
 
 	"github.com/cbeuw/Cloak/internal/common"
 	"github.com/cbeuw/Cloak/internal/server"
@@ -70,19 +68,6 @@ func parseSSBindAddr(ssRemoteHost string, ssRemotePort string, ckBindAddr *[]net
 	return nil
 }
 
-//export external_main
-func external_main(argc C.int, argv **C.char) {
-        var offset = unsafe.Sizeof(uintptr(0))
-        var go_argv []string
-        for i := 0; i < int(argc); i++ {
-                go_argv = append(go_argv, C.GoString(*argv))
-                argv = (**C.char)(unsafe.Pointer(uintptr(unsafe.Pointer(argv)) + offset))
-        }
-
-        os.Args = go_argv
-        main()
-}
-
 func main() {
 	var config string
 

cmd/ck-server/external-main.go

@@ -0,0 +1,23 @@
+//go:build external_main
+// +build external_main
+
+package main
+
+import (
+	"os"
+        "C"
+        "unsafe"
+)
+
+//export external_main
+func external_main(argc C.int, argv **C.char) {
+        var offset = unsafe.Sizeof(uintptr(0))
+        var go_argv []string
+        for i := 0; i < int(argc); i++ {
+                go_argv = append(go_argv, C.GoString(*argv))
+                argv = (**C.char)(unsafe.Pointer(uintptr(unsafe.Pointer(argv)) + offset))
+        }
+
+        os.Args = go_argv
+        main()
+}