Cygwin debugger crashes every time on following a unique_ptr

[Raj Kumar <gaurav@iastate.edu>]

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Hi,

I use CLion for code development. I initially posted this bug there
but they said that it is an issue with the Cygwin GDB, and hence I am
sending this mail.

I am using cygwin64 version 3.0.7 with Cygwin debugger version 8.1.1

Sample code to reproduce the code has been attached. In the Clion
environment, this is what is happening:

A dummy example code has been attached. In the example, on line 17 in
main.cpp, you can see that in the Variables tab, the currentPassengers
vector<>() is populated correctly. But when I right click on
currentPassengers and select "Add to Watches", the entire debugger
crashes. The same thing happens when I hover over the variable names
in the code to get the values.


Adding a watch is equivalent to when in the gdb window I try and do
this: myCar.get()->currentPassengers. This crashes the GDB every time.
So the issue occurs when I try to follow the object pointed to by a
unique_ptr and try to get its attributes/variables.


Gaurav
515-357-3480
MS-CS, Iowa State University

[-- Attachment #2: main.cpp --]
[-- Type: application/octet-stream, Size: 440 bytes --]

#include <iostream>
#include <vector>
#include <memory>
#include "Vehicle.h"

using namespace std;

int main() {

    unique_ptr<Vehicle> myCar = make_unique<Vehicle>();
    myCar->setPassengerCapacity(4);

    myCar->addPassenger("Alice");
    myCar->addPassenger("Bob");
    myCar->addPassenger("Charlie");

    for(int i = 0; i < myCar->currentPassengers.size(); i++){
        cout << myCar->currentPassengers[i];
    }


    return 0;
}

[-- Attachment #3: Vehicle.h --]
[-- Type: application/octet-stream, Size: 518 bytes --]

//
// Created by rajga on 5/24/2019.
//

#ifndef TESTBED_VEHICLE_H
#define TESTBED_VEHICLE_H

#include <iostream>
#include <string>
#include <string.h>
#include <vector>

using namespace std;


class Vehicle {

private:
    int noOfWheels;
    int passengerCapacity;

public:

    vector<string> currentPassengers;
    void getPassengerCapacity();
    void setPassengerCapacity(int k);
    void getCurrentPassengers();
    void addPassenger(string s);

};


#endif //TESTBED_VEHICLE_H

[-- Attachment #4: Vehicle.cpp --]
[-- Type: application/octet-stream, Size: 884 bytes --]

//
// Created by rajga on 5/24/2019.
//

#include "Vehicle.h"
#include <iostream>

using namespace std;

void Vehicle::getPassengerCapacity(){
    cout << "The passenger capacity is: " << this->passengerCapacity << endl;
}

void Vehicle::setPassengerCapacity(int k){

    this->passengerCapacity = k;
    cout << "The passenger capacity is changed to: " << this->passengerCapacity << endl;
}

void Vehicle::getCurrentPassengers(){

    cout << "Current passengers are: " << endl;
    for(int i = 0; i < this->currentPassengers.size(); i++){
        cout << this->currentPassengers[i] << endl;
    }
}

void Vehicle::addPassenger(string s){

    if(this->currentPassengers.size() < this->passengerCapacity){
        this->currentPassengers.push_back(s);
        getCurrentPassengers();
    }else{
        cout << "Vehicle full!!" << endl;
    }


}

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