为什么出现警告：
_XmGetDefaultDisplay can't be used prior to Vendors.Initialize,return NULL
代码片断如下：
ProgExcutor_p shlProgEx = (ProgExcutor_p)NULL;
XtAppContext app_context = (XtAppContext)0;
Display *display = (Display*)0;

void ProgExcutor::create(Display *display,char* app_name,int app_argc,
    char** app_argv,char* app_class_name)
{
    shlProgEx = XtAppCreateShell(app_name,app_class_name,
                              overrideShellWidgetClass,display,al,ac);
    pixmap = XmGetPixmap(...);
    main_w = XmCreateMainWindow(shlProgEx,"main_window",al,ac);
    ......
}

int main(int argc, char **argv)
{   ......
    XtToolkitInitialize();
    app_context = XtCreateApplicationContext();
    display = XtOpenDisplay(app_context,(string)0,argv[0],"XApplication",
        (XrmOptionDescRec*)0,0,&argc,argv);
    XmRepTypeInstallTearOffModelConverter();
    shlProgEx = new ProgExcutor();
    shlProgEx->create(display,argv[0],argc,argv,"XApplication");
    XtRealizeWidget(shlProgEx->xd_rootwidget());
    ......
    XtAppMainLoop(app_context);
    exit(0);
}

没觉得有问题。什么系统？连接了什么库？是否是BUG？