Double Delete caused by 2 shared library has global object of same name, 1) reproduce-优快云博客

本文链接：https://blog.youkuaiyun.com/SharonMei1219/article/details/8594375

本文探讨了在使用共享库时，全局对象名称冲突导致的双删错误问题，通过4个文件的代码实现和链接步骤，展示了如何重现此现象，并分析了其原因。

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Problem Precondition:

Program linked with 2 shared library, "libSub1.so" and "libSub2.so"
Each shared library defines a global object with same name, "object"
Such object has memory allocation in its construction and deletion in its destruction

Phenomenon:

Compile -> no error report

Link -> no error report

Run -> good, except a "double delete" error occurred after program run

Reproduce:

1. code (4 files)

program.cc

has nothing to do with the global object

#include <iostream>
using namespace std;
main(){
    cout << "Hello World" << endl;
}

sub1.cc

defines a global object

#include "object.h"

Object object;
sub2.cc

defines a global object with the same name as the one in sub1

#include "object.h"

Object object;
object.h

defines the object, who has the memory allocation in construction and memory deletion in destruction

#ifndef _OBJ_H_
#define _OBJ_H_
class Object{
public:
    Object();
    ~Object();

private:
    char * buffer;
};
#endif

object.cc

implements the object

#include "object.h"

Object::Object(){
    buffer = new char[10];
}

Object::~Object(){
    delete [] buffer;
}

2.link(4 steps)

g++ object.cc -g -fPIC -shared -o libobject.so

g++ sub1.cc -g -fPIC -shared -o libsub1.so

g++ sub2.cc -g -fPIC -shared -o libsub2.so

g++ -Wl,-rpath,. program.cc -L. -lsub1 -lsub2 -lobject -o test

3. run