[config] Disabling symbol visibility?

From: John Maddock (jz.maddock_at_[hidden])
Date: 2019-05-19 12:02:21

We have an open ticket from someone that wants all symbols hidden, 
including those marked with BOOST_SYMBOL_VISIBLE, is this sensible to 
support?  What are the likely consequences of doing so?

See https://github.com/boostorg/config/issues/243

Thanks in advance, John.

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