LNK1120: 1 unresolved externals for toUtf8 and assertion for QString::toStdString()

Hi all,
I am testing with a new QT5.5 project x86 under VS2015.
Here is my little program:

Code:

---

#include <QtCore/QCoreApplication>
#include <QDebug>
#include <QByteArray>
 
 
1 int main(int argc, char *argv[]){
2	QCoreApplication a(argc, argv);
3	QString message="1234567890";
4
5	std::string str=message.toStdString().c_str();
6	QByteArray a1=message.toUtf8();
7
8	qDebug()<<str.c_str();
9
10	return a.exec();
11 }

---

The troubles:
1) After building I get error LNK2019: unresolved external symbol for QString::toUtf8() in 6);
2) If I delete the line 6) and run the program I get:
1) An assertion into minkernel\crts\ucrt\src\appcrt\heap\debug_heap.cpp in Debug mode;
2) no 'apparent' problem in release mode.



No problems under the QT Creator.

What I can search for?


Cheers,
Giorgio

---

Added after 21 minutes:

I seen that setting 'Visual Studio 2013 (v120)' in project property page --> Configuration Properties --> Platform toolset
the assertion does not happen and also the LNK2019 is solved.

Can some one explain me in details the motive, please?

Cheers.
Giorgio


Cheers,
Giorgio

Some earlier versions of Qt were built with the MSVC flag "treat wchar_t as a built-in type" set to FALSE. Current versions now have it set to TRUE. Look at the Properties->Configuration Properties->C/C++->Language page in MSVC. This would cause errors with conversion between QString and std:wstring / std::string.

In addition, MSVC 2015 is not yet officially supported by Qt, whereas MSVC 2013 is. Using VS 2013 as the platform toolset changes some of the defaults and that allows a Qt app to compile and link without complaints.

I assume that the upcoming Qt 5.6 release will have support for MSVC 2015. If not, continue to use the 2013 toolset setting.

Thank you very much, I will keep in mind your kindly given info.

Giorgio