> Andrew's constructors are variadic.  That means we just plain
> _cannot_ write generic macros that pass some of their arguments into
> sysctl constructors, in the way that FreeBSD does: the number of
> arguments in the macro-expansion has to vary, and C macros just can't
> do that.

But gcc macros can, and as I recall we've got enough dependencies on
gccisms that it might not be all that bad to use them.

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