[Boost.Config] Should BOOST_FORCEINLINE depend on NDEBUG?

From: dariomt_at_[hidden]
Date: 2020-01-29 09:11:29

Right now BOOST_FORCEINLINE does not depend on NDEBUG.

This means that on Debug builds the code asks to be forced-inlined with
optimizations disabled, which does not make much sense to me. This is
reflected by a myriad warnings in msvc under level 4 warnings.
In fact Multiprecision library works around this issue by defining their
own macro BOOST_MP_FORCEINLINE which decays to just inline in Debug builds
(boost/multiprecision/detail/number_base.hpp lines 25-29).

I think this behavior should be adopted by BOOST_FORCEINLINE. I'm happy to
do a PR if there is agreement from maintainers.