Mongocxx crash in Qt Creator (Windows)

Hi, I’m working on a project in Qt Creator and I’m trying to integrate mongocxx into the project. I downloaded the mongo c driver (1.17.0), boost (1.7.3), and the mongocxx driver (3.6.0) according the documentation and everything seemed to build successfully (I used “Visual Studio 15 2017 Win64” with the -G flag). In my .pro file, I added include paths and libs for the driver, and my project manages to build and execute successfully with mongocxx includes in my header files. However, as soon as I try to add any code that uses mongocxx (like the line mongocxx::instance inst{};), the program crashes when I try to execute it and will continue to crash until I comment out the code and clean/rebuild the project (error message only says “The program has unexpectedly finished”).

It seems like I didn’t connect my project to the mongocxx driver correctly, but I’m not sure what else to check, so any suggestions would be appreciated! I’m using a kit with Qt 5.15.0 MSVC 2015 64-bit to build and run my project.

test code:

#include "database_utils.h"

#include <bsoncxx/builder/stream/document.hpp>
#include <bsoncxx/json.hpp>

#include <mongocxx/client.hpp>
#include <mongocxx/instance.hpp>
#include <iostream>

// reference:
bool connectToDatabase() {
    std::cout <<"in connect!" << std::endl;
// execution fails if this code is uncommented (and print statement above is not reached)
//    try {
//        mongocxx::instance inst{}; // This should be done only once.
//        mongocxx::client conn{
//            mongocxx::uri{
//                "mongodb+srv://"
//            }
//        };
//    } catch (...) {
//        std::cout << "caught" << std::endl;
//    }
    return false;

.pro file:

QT       += core gui

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

CONFIG += c++11

# You can make your code fail to compile if it uses deprecated APIs.
# In order to do so, uncomment the following line.
DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0

    C:/Users/craft/Downloads/mongo-cxx-driver-r3.6.0/include/mongocxx/v_noabi \
    C:/Users/craft/Downloads/mongo-cxx-driver-r3.6.0/include/bsoncxx/v_noabi \
    C:/Users/craft/Downloads/boost_1_73_0 \

LIBS += \
    -LC:/Users/craft/Downloads/mongo-cxx-driver-r3.6.0/lib -lmongocxx \
    -LC:/Users/craft/Downloads/mongo-cxx-driver-r3.6.00/lib -lbsoncxx

    appointment.cpp \
    database_utils.cpp \
    doctor.cpp \
    doctorview.cpp \
    main.cpp \
    loginui.cpp \
    patient.cpp \
    patientview.cpp \
    schedule.cpp \

    appointment.h \
    database_utils.h \
    doctor.h \
    doctorview.h \
    loginui.h \
    patient.h \
    patientview.h \
    schedule.h \

FORMS += \
    doctorview.ui \
    loginui.ui \

# Default rules for deployment.
qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += target`