Project wizards: warn when using deprecated APIs in new projects

As discussed at QtCS, almost none of our users know that they can
get warnings when they use deprecated APIs, and/or disable them
altogether. A first step would be getting the relevant defines added
by the new project wizards.

Change-Id: I5d4260b5aa094ac2a077b7b00eaa577108e5f612
Reviewed-by: Alessandro Portale <alessandro.portale@qt.io>

share/qtcreator/templates/wizards/projects/qmake/consoleapp/file.pro

@@ -10,3 +10,14 @@ CONFIG -= app_bundle
 TEMPLATE = app
 
 SOURCES += %{MainCppName}
+
+# The following define makes your compiler emit warnings if you use
+# any feature of Qt which as been marked deprecated (the exact warnings
+# depend on your compiler). Please consult the documentation of the
+# deprecated API in order to know how to port your code away from it.
+DEFINES += QT_DEPRECATED_WARNINGS
+
+# You can also make your code fail to compile if you use deprecated APIs.
+# In order to do so, uncomment the following line.
+# You can also select to disable deprecated APIs only up to a certain version of Qt.
+#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0

share/qtcreator/templates/wizards/projects/qmake/qtcanvas3dapplication/app.pro

@@ -11,6 +11,17 @@ RESOURCES += qml.qrc
 # Additional import path used to resolve QML modules in Qt Creator's code model
 QML_IMPORT_PATH =
 
+# The following define makes your compiler emit warnings if you use
+# any feature of Qt which as been marked deprecated (the exact warnings
+# depend on your compiler). Please consult the documentation of the
+# deprecated API in order to know how to port your code away from it.
+DEFINES += QT_DEPRECATED_WARNINGS
+
+# You can also make your code fail to compile if you use deprecated APIs.
+# In order to do so, uncomment the following line.
+# You can also select to disable deprecated APIs only up to a certain version of Qt.
+#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0
+
 # Default rules for deployment.
 qnx: target.path = /tmp/$${TARGET}/bin
 else: unix:!android: target.path = /opt/$${TARGET}/bin

share/qtcreator/templates/wizards/projects/qmake/qtquickapplication/app.pro

@@ -13,6 +13,17 @@ QML_IMPORT_PATH =
 # Additional import path used to resolve QML modules just for Qt Quick Designer
 QML_DESIGNER_IMPORT_PATH =
 
+# The following define makes your compiler emit warnings if you use
+# any feature of Qt which as been marked deprecated (the exact warnings
+# depend on your compiler). Please consult the documentation of the
+# deprecated API in order to know how to port your code away from it.
+DEFINES += QT_DEPRECATED_WARNINGS
+
+# You can also make your code fail to compile if you use deprecated APIs.
+# In order to do so, uncomment the following line.
+# You can also select to disable deprecated APIs only up to a certain version of Qt.
+#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0
+
 # Default rules for deployment.
 qnx: target.path = /tmp/$${TARGET}/bin
 else: unix:!android: target.path = /opt/$${TARGET}/bin

share/qtcreator/templates/wizards/projects/qmake/qtquickcontrols2application/app.pro

@@ -12,6 +12,17 @@ QML_IMPORT_PATH =
 # Additional import path used to resolve QML modules just for Qt Quick Designer
 QML_DESIGNER_IMPORT_PATH =
 
+# The following define makes your compiler emit warnings if you use
+# any feature of Qt which as been marked deprecated (the exact warnings
+# depend on your compiler). Please consult the documentation of the
+# deprecated API in order to know how to port your code away from it.
+DEFINES += QT_DEPRECATED_WARNINGS
+
+# You can also make your code fail to compile if you use deprecated APIs.
+# In order to do so, uncomment the following line.
+# You can also select to disable deprecated APIs only up to a certain version of Qt.
+#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0
+
 # Default rules for deployment.
 qnx: target.path = /tmp/$${TARGET}/bin
 else: unix:!android: target.path = /opt/$${TARGET}/bin

share/qtcreator/templates/wizards/projects/qmake/qtquickcontrolsapplication/app.pro

@@ -18,6 +18,17 @@ QML_IMPORT_PATH =
 # Additional import path used to resolve QML modules just for Qt Quick Designer
 QML_DESIGNER_IMPORT_PATH =
 
+# The following define makes your compiler emit warnings if you use
+# any feature of Qt which as been marked deprecated (the exact warnings
+# depend on your compiler). Please consult the documentation of the
+# deprecated API in order to know how to port your code away from it.
+DEFINES += QT_DEPRECATED_WARNINGS
+
+# You can also make your code fail to compile if you use deprecated APIs.
+# In order to do so, uncomment the following line.
+# You can also select to disable deprecated APIs only up to a certain version of Qt.
+#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0
+
 # Default rules for deployment.
 qnx: target.path = /tmp/$${TARGET}/bin
 else: unix:!android: target.path = /opt/$${TARGET}/bin

src/plugins/qmakeprojectmanager/wizards/qtprojectparameters.cpp

@@ -112,6 +112,19 @@ void QtProjectParameters::writeProFile(QTextStream &str) const
 
     if (!targetDirectory.isEmpty())
         str << "\nDESTDIR = " << targetDirectory << '\n';
+
+    if (qtVersionSupport != SupportQt4Only) {
+        str << "\n"
+               "# The following define makes your compiler emit warnings if you use\n"
+               "# any feature of Qt which as been marked as deprecated (the exact warnings\n"
+               "# depend on your compiler). Please consult the documentation of the\n"
+               "# deprecated API in order to know how to port your code away from it.\n"
+               "DEFINES += QT_DEPRECATED_WARNINGS\n\n"
+               "# You can also make your code fail to compile if you use deprecated APIs.\n"
+               "# In order to do so, uncomment the following line.\n"
+               "# You can also select to disable deprecated APIs only up to a certain version of Qt.\n"
+               "#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0\n";
+    }
 }
 
 void QtProjectParameters::writeProFileHeader(QTextStream &str)