
An empty argument list means "unspecified arguments", and not "no arguments" like it does in C++. If an implementer of Mutter plugins uses gcc -Wold-style-definition, as configured by AX_COMPILER_FLAGS_CFLAGS, they will get warnings about this. Signed-off-by: Simon McVittie <simon.mcvittie@collabora.co.uk> Reviewed-by: Florian Müllner <fmuellner@gnome.org> Bug: https://bugzilla.gnome.org/show_bug.cgi?id=769971
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