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我正在尝试使用 OptionMenu Motif Widget 编译一个基本窗口。

这是我尝试过的：

#include <Xm/Xm.h>
#include <Xm/PushB.h>

XtAppContext    context;
XmStringCharSet char_set=XmSTRING_DEFAULT_CHARSET;

Widget          toplevel;
Widget          optionMenu;
Widget          optionMenuItem1;
Widget          optionMenuItem2;

Widget addMenuItem(char *itemName, XtPointer clientData, Widget menuWidget) {

        int ac;
        Arg al[10];
        Widget item;

        ac=0;
        XtSetArg(al[ac],XmNlabelString, XmStringCreateLtoR(itemName, char_set)); ac++;
        item=XmCreatePushButton(menuWidget,itemName,al,ac);
        XtManageChild(item);
        /*XtAddCallback(item,XmNactivateCallback,menuCB,clientData);*/
        XtSetSensitive(item,True);
        return(item);

}

int main(int argc, char *argv[]){

        Arg             al[10];
        int             ac;

        /* CREATE TOP LEVEL */
        toplevel = XtAppInitialize(&context, "test1", NULL, 0, &argc, argv, NULL, NULL, 0);

        /* RESIZE TOP LEVEL */
        ac=0;
        XtSetArg(al[ac], XmNheight, 300); ac++;
        XtSetArg(al[ac], XmNwidth, 300); ac++;
        XtSetValues(toplevel, al, ac);


        /* CREATE OPTIONS MENU */
        ac=0;
        optionMenu = XmCreateOptionMenu(toplevel, "optionMenu", al, ac);
        XtManageChild(optionMenu);
        optionMenuItem1 = addMenuItem("item1", "Item 1", optionMenu);
        optionMenuItem2 = addMenuItem("item2", "Item 2", optionMenu);


        /* DISPLAY TOP LEVEL */
        XtRealizeWidget(toplevel);
        XtAppMainLoop(context);
}

这是我得到的编译警告，我不知道它为什么给出它：

$ cc -std=c89 test1.c -I/usr/local/include -L/usr/local/lib -lXm -lXt -lX11
test1.c:45:13: warning: incompatible integer to pointer conversion assigning to 'Widget' (aka 'struct _WidgetRec *') from 'int' [-Wint-conversion]
        optionMenu = XmCreateOptionMenu(toplevel, "optionMenu", al, ac);
                   ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1 warning generated.

当我尝试执行它时，它会生成一个核心转储：

$ ./a.out
Segmentation fault (core dumped)

因为我总是编译没有警告的东西，所以我想了解为什么会出现该警告并首先摆脱它。

编辑：

xmcreateoptionmenu如评论中所述，添加修复问题的手册页中指定的 <Xm/RowColumn.h> 。

另外，生成选项菜单的代码是错误的，我附上正确的。请注意，没有为小部件分配标签：

#include <Xm/Xm.h>
#include <Xm/PushB.h>
#include <Xm/RowColumn.h>

XtAppContext    context;
XmStringCharSet char_set=XmSTRING_DEFAULT_CHARSET;

Widget          toplevel;
Widget          pulldownMenu, optionMenu;
Widget          optionMenuItem1;
Widget          optionMenuItem2;

Widget addMenuItem(char *itemName, XtPointer clientData, Widget menuWidget) {

        int ac;
        Arg al[10];
        Widget item;

        ac=0;
        XtSetArg(al[ac],XmNlabelString, XmStringCreateLtoR(itemName, char_set)); ac++;
        item=XmCreatePushButton(menuWidget,itemName,al,ac);
        XtManageChild(item);
        /*XtAddCallback(item,XmNactivateCallback,menuCB,clientData);*/
        XtSetSensitive(item,True);
        return(item);

}

int main(int argc, char *argv[]){

        Arg             al[10];
        int             ac;

        /* CREATE TOP LEVEL */
        toplevel = XtAppInitialize(&context, "test1", NULL, 0, &argc, argv, NULL, NULL, 0);

        /* RESIZE TOP LEVEL */
        ac=0;
        XtSetArg(al[ac], XmNheight, 300); ac++;
        XtSetArg(al[ac], XmNwidth, 300); ac++;
        XtSetValues(toplevel, al, ac);


        /* CREATE OPTIONS MENU */
        pulldownMenu=XmCreatePulldownMenu(toplevel, "pulldownMenu",NULL,0);
        optionMenuItem1 = addMenuItem("item1", "Item 1", pulldownMenu);
        optionMenuItem2 = addMenuItem("item2", "Item 2", pulldownMenu);
        ac=0;
        XtSetArg(al[ac], XmNsubMenuId, pulldownMenu); ac++;
        optionMenu = XmCreateOptionMenu(toplevel, "optionMenu", al, ac);
        XtManageChild(optionMenu);


        /* DISPLAY TOP LEVEL */
        XtRealizeWidget(toplevel);
        XtAppMainLoop(context);
}
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