[boost] New B2 version, and CI failures.

Subject: [boost] New B2 version, and CI failures.
From: Rene Rivera (grafikrobot_at_[hidden])
Date: 2019-04-13 13:27:54

As some of you may have noticed, there were some changes to B2 yesterday
(4-12). As previously mentioned I merged the start of the B2 C++ engine
port to the develop branch. That change included some "improvements" to the
building of the B2 executable. One of those improvements may be causing
people CI failures. The new build scripts for B2 now respect, and use, the
CXX and CXXFLAGS environment variables. As such it means that if you have
those set for other reasons it may confuse the B2 build (i.e.
bootstrap.sh/bat invocation) and fail that build. If that's the case you
will need to clear those variables before invoking boostrap.sh/bat or
build.sh/bat.

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