[Boost-build] B2, transition to C++

Subject: [Boost-build] B2, transition to C++
From: Rene Rivera (grafikrobot_at_[hidden])
Date: 2019-04-04 02:37:55

After six months of, slowly, working towards this I can now say that the
C++ compiled version of the B2 engine is ready for use. As such I plan, if
there are no objections from Steven Watanabe and Vladimir Prus, to merge
the result into the develop branch shortly after the 1.70 release. The
history note accompanying this "new" engine version goes like this:

===
Version 4.0.0
After even more years of development the landscape of build systems has
changed considerably, and so has the landscape of compilers. This version
marks the start of B2 transitioning to a C++ implementation. Initially this
means that the engine will be compiled as C++ source but that source is
still the base C implementation. Over time it will transform to a C++ code
base in both the engine and build system. Some changes in this start:

* Requires C++ 11 to build engine.
* Simplified build scripts to make it easier to maintain.
* Building with C++ optimizations gives an immediate performance
improvement.
===

There will obviously be bumps on the road when that merge goes in. As the
C++ 11 requirement might require some changes for testers and users. But
hopefully they will be minor.

-- 
-- Rene Rivera
-- Grafik - Don't Assume Anything
-- Robot Dreams - http://robot-dreams.net