修复对dlopen和dlcose的未定义引用

问题描述

我已经创建了简单的c ++应用程序.我可以编译它，并且工作正常.但是现在我需要动态地加载库，并且已经在项目中添加了dlfnc.h并添加了更多代码:

I have created simple c++ application. I can compile it and t works fine. But now I need to load library dynamically and I have added dlfnc.h to my project and added some more code:

#include <iostream>
#include <dlfcn.h>
void *mylib;
int eret;

using namespace std;

int main() {

    mylib = dlopen("mylib.so", RTLD_LOCAL | RTLD_LAZY);
    eret = dlclose(mylib);

    cout << "!!!Hello World!!!" << endl; // prints !!!Hello World!!!
    return 0;
}

编译:

myname@ubuntu:~/workspace/LinuxGcc/src$ g++ LinuxGcc.cpp 

出现编译错误:

/tmp/ccxTLiGY.o: In function `main':
LinuxGcc.cpp:(.text+0xf): undefined reference to `dlopen'
LinuxGcc.cpp:(.text+0x25): undefined reference to `dlclose'
collect2: error: ld returned 1 exit status

dlfcn.h存在于/usr/include/

哪里有问题?

推荐答案

dlopen(3):

dlopen(3):

   Link with -ldl.

如此

g++ LinuxGcc.cpp -ldl

会没事的.

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