Cocos2D-X编译Linux错误：未定义参考

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.