About the dynamic library relocation warning and findChild return NULL

[lvbing lvbing]

Qt version：4.5.3

Platform :5.10 Generic_142909-17 sun4v sparc SUNW,SPARC-Enterprise-T5120  solaris-cc-64

When compile the code,has the warning:

ld:警告：重定位警告:R_SPARC_COPY：文件libdll_widget.so:符号 MDrawWidget::staticMetaObject:重定位绑定到具有STV_PROTECTED可见性的符号

Below is my test code:

1、The dynamic library: dll_widget，has an UI class MDRawWidget，inherits QWidget。

The class define:

class DLL_WIDGET_EXPORT MDrawWidget : public QWidget

{

    Q_OBJECT

public:

    MDrawWidget(QWidget* parent = 0,Qt::WindowFlags f = 0);

    ~MDrawWidget();

private:

    void Init()

};

This UI is just create a simple UI,like an QTabWidget,QPushButton。

2、an executable process: Widget_test

This process include the  library "dll_widget"

In the header file:

MDrawWidget* m_pDrawWidget;

In the source file:

m_pDrawWidget = new MDrawWidget(this);

m_pDrawWidget->setObjectName("DrawApcWidget");

---------------------------------------------------------------------------------------------------------------------------------

Now,The program is:

If I use the findChild to get the MDrawWidget object,When compile the code,it will be warning like up! and when run it,findChild will return NULL! 

The code like below:

MDrawWidget* pDrawWidget = findChild<MDrawWidget*>("DrawApcWidget");

if( pDrawWidget )

{

    //TODO

}

If I use the member pointer,it's OK

if( m_pDrawWidget )

{

    //TODO

}

At last,it run  OK in win7.

Thanks