Re: Host requirements to build the Tools binaries

> Indeed, adding a "visibility define" not only ensures that everything
> from that spec is present, but that everything not in that spec is
> not present.

That paradigm makes it impossible to bring in two groups of non-base
declarations from the same include file.  If defining GROUP1_SOURCE is
suppsoed to mean nothing but base and GROUP1 are present, and s/1/2/
for GROUP2_SOURCE, then defining both of them produces a conflict.

Mind you, I don't know whether that's the nominal semantic for any of
the defines here.

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