Disable old (Qt4-style) Signal-Slot syntax in Qt5 code

If you have a shared header file in the project that you can ensure will be included after QObject, you can do this:

#define SIGNAL(x) static_assert(false, "String-based signal/slot syntax has been disabled in this project")

Same for SLOT.

If you want to turn it into warning, check out this answer. I definitely agree with you that the string based syntax is a plague and shouldn't occur outside of uiced files.

Based on this answer.

You can override the SIGNAL macro in your project if you have a common header that is included in every file.

Make sure it is included after the Qt/QObject includes.

#undef SIGNAL
#define SIGNAL(x) "",nullptr,""); static_assert(false, "String-based signal/slot syntax has been disabled in this project");

This will show an error message when trying to compile a Qt4-style connect statement.