fix serverapi.h things

gframe/serverapi.cpp

@@ -9,7 +9,7 @@
 #include <memory>
 
 namespace ygo {
-	extern "C" DECL_DLLEXPORT int start_server(const char* args) {
+	YGOSERVER_API int start_server(const char* args) {
 		int argc = 1;
 		char** argv = new char* [13];
 		const char* server_name = "ygoserver";
@@ -44,7 +44,7 @@ namespace ygo {
 
 		return result;
 	}
-	extern "C" DECL_DLLEXPORT void stop_server() {
+	YGOSERVER_API void stop_server() {
 		NetServer::StopServer();
 	}
 }

gframe/serverapi.h

 #ifndef SERVERAPI_H
 #define SERVERAPI_H
 
-#ifdef WIN32
-#define DECL_DLLEXPORT __declspec(dllexport)
+#ifdef __cplusplus
+#define EXTERN_C extern "C"
 #else
-#define DECL_DLLEXPORT
+#define EXTERN_C
 #endif
+
+#ifndef YGOSERVER_API
+#if defined(__EMSCRIPTEN__)
+  #include <emscripten/emscripten.h>
+  #define YGOSERVER_API EXTERN_C EMSCRIPTEN_KEEPALIVE
+#elif defined(_WIN32)
+#define YGOSERVER_API EXTERN_C __declspec(dllexport)
+#else
+#define YGOSERVER_API EXTERN_C __attribute__ ((visibility ("default")))
+#endif
+#endif
+
 namespace ygo {
-	extern "C" DECL_DLLEXPORT int start_server(const char* args);
-	extern "C" DECL_DLLEXPORT void stop_server();
+	YGOSERVER_API int start_server(const char* args);
+	YGOSERVER_API void stop_server();
 }
 
 #endif // !SERVERAPI_H