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giscanner: Support function macros with zero arguments and ISO varargs

Philip Withnall requested to merge pwithnall/gobject-introspection:function-macro-varargs into main

This fixes support for macros like G_BREAKPOINT(), G_DEBUG_HERE() and g_message() in GLib.

Signed-off-by: Philip Withnall pwithnall@endlessos.org

Note that it doesn’t add support for GNUC varargs (g_message(format...)) as they have been superseded by ISO varargs.

For some reason I can’t get the <varargs/> element to appear inside <parameter name="..."> in the generated GIR file, but at least the documentation is now exposed.

Triggered by glib#2617 (closed).

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