[SailfishDevel] Why this error now?

[Chris Walker]

I'm trying to deploy my app to my phone and on the emulator it works -
in debug mode. But as soon as I switch to release mode, it keels over.

Here's the cpp code where it fails :-

#ifdef QT_QML_DEBUG
#include <QtQuick>
#endif

#include <QGuiApplication>
#include <QQuickView>

#include <sailfishapp.h>
#include "DatabaseManager.h"

Q_DECL_EXPORT int main(int argc, char *argv[])
{
    QScopedPointer<QGuiApplication> app(SailfishApp::application(argc,
argv)); QScopedPointer<QQuickView> view(SailfishApp::createView());

    DatabaseManager* db = new DatabaseManager();
    db->open();

    view->rootContext()->setContextProperty("db", db);

    view->setSource(SailfishApp::pathTo("qml/beertent.qml"));

    view->show();

    return app->exec();
}

The error is invalid use of incomplete type 'struct QQmlContext'

I can easily fix it by adding #include <QQmlContext> and it all then
works as expected but my query is this. Why does it work in debug mode
with no errors but fails in release mode?