Issue using QString

[ChrisW67]

Try building:

#include <string>
#include <iostream>
 
int main(void) 
{
    std::string s("Hello", 5);  // This is what Qt does in toStdString()
    std::cout << s << std::endl;
    return 0;
}

#include <string>
#include <iostream>

int main(void) 
{
    std::string s("Hello", 5);  // This is what Qt does in toStdString()
    std::cout << s << std::endl;
    return 0;
}

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If that fails when run then the problem has nothing to do with Qt.