It seems that gtk only provides compile time macros such as GDK_IS_X11_DISPLAY
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https://gitlab.gnome.org/GNOME/gtk/-/blob/gtk-3-24/gtk/gtkpopover.c#L772
The #ifdef
checks whether GTK was compiled with wayland support. The GTK_IS_WAYLAND_DISPLAY()
is a runtime check.
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You can follow the example in the GDK documentation which explains how to use compile time and run time checks to know the backend currently in use.
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