Cocos2D-X compile Linux Error: Undefined Reference - c++

Question

I'm new to cocos2D-X (v 3.6), I'm using Linux to compile and run my project. When I try the following command line:
cocos compile -p linux
It gives me errors:
Linking CXX executable bin/MyGame
CMakeFiles/MyGame.dir/Classes/AppDelegate.cpp.o: In function `AppDelegate::applicationDidFinishLaunching()':
/home/caisar/MyCompany/MyGame/Classes/AppDelegate.cpp:53: undefined reference to `GraphicsScene::createScene()'
collect2: error: ld returned 1 exit status
make[2]: *** [bin/MyGame] Error 1
make[1]: *** [CMakeFiles/MyGame.dir/all] Error 2
make: *** [all] Error 2
Error running command, return code: 2
This is my GraphicsScene.h:
#ifndef __GRAPHICS_SCENE_H__
#define __GRAPHICS_SCENE_H__
#include "cocos2d.h"
class GraphicsScene : public cocos2d::Layer{
public:
static cocos2d::Scene* createScene();
virtual bool init();
void menuCloseCallback(cocos2d::Ref* pSender);
CREATE_FUNC(GraphicsScene);
};
#endif
And this is my GraphicsScene.cpp:
#include "GraphicsScene.h"
USING_NS_CC;
Scene* GraphicsScene::createScene(){
auto scene = Scene::create();
auto layer = GraphicsScene::create();
scene->addChild(layer);
return scene;
}
bool GraphicsScene::init(){
if(!Layer::init()){
return false;
}
auto sprite = Sprite::create("autobot.png");
sprite->setPosition(0,0);
this->addChild(sprite, 0);
return true;
}
void GraphicsScene::menuCloseCallback(Ref* pSender)
{
Director::getInstance()->end();
#if (CC_TARGET_PLATFORM == CC_PLATFORM_IOS)
exit(0);
#endif
}
Is there anything else I need to add?

Answer 1

I also had this problem today and solved it by editing the PROJECT_PATH/CMakeLists.txt file. You must include the *.cpp and *.h filepaths in the GAME_SRC and GAME_HEADERS sections. For example, in your case it must be something like this:
set(GAME_SRC
Classes/AppDelegate.cpp
Classes/HelloWorld.cpp
Classes/GraphicsScene.cpp
${PLATFORM_SPECIFIC_SRC}
)
set(GAME_HEADERS
Classes/AppDelegate.h
Classes/HelloWorld.h
Classes/GraphicsScene.h
${PLATFORM_SPECIFIC_HEADERS}
)
Hope that it works!

Answer 2

I guess the linker did not find the .cpp source file for GraphicsScene::createScene(). And you should add GraphicsScene.cpp to Android.mk file. Such as i did that for my project on windows.
LOCAL_SRC_FILES := hellocpp/main.cpp \
../../Classes/Graphic_Image.cpp \
Hope it help.
Thanks.