[Boost-build] explicitly-specified values of non-free feature <threading> conflict

Subject: [Boost-build] explicitly-specified values of non-free feature <threading> conflict
From: Steve Robbins (steve_at_[hidden])
Date: 2018-01-17 05:01:55

Hi,

My tester ("Debian-Sid") stopped working December 22.  It now fails with the following 
error.  Any idea what it means?  Or where to start looking?

/var/lib/jenkins/jobs/Boost-Testing-master-64/workspace/boost_bb/src/build/feature.jam:
779: in expand-composites from module feature
error: explicitly-specified values of non-free feature <threading> conflict
error: existing values: multi single
error: value from expanding  <threading>single : single
/var/lib/jenkins/jobs/Boost-Testing-master-64/workspace/boost_bb/src/build/feature.jam:
864: in feature.expand from module feature
/var/lib/jenkins/jobs/Boost-Testing-master-64/workspace/boost_bb/src/build/property-
set.jam:159: in class_at_property-set.expand from module object(property-set)@293159
/var/lib/jenkins/jobs/Boost-Testing-master-64/workspace/boost_bb/src/build/targets.jam:
900: in targets.apply-default-build from module targets

[ ... ]

/var/lib/jenkins/jobs/Boost-Testing-master-64/workspace/boost_bb/src/kernel/
bootstrap.jam:139: in boost-build from module
/var/lib/jenkins/jobs/Boost-Testing-master-64/workspace/boost_root/boost-build.jam:17: 
in module scope from module

The content of boost_root/boost-build.jam is:

# Copyright (C) 2002-2003 David Abrahams. 
I've attached the full bjam.log.   The build proceeds as follows:

wget https://raw.githubusercontent.com/boostorg/regression/develop/testing/src/run.py 

export HOME=`pwd`
echo 'using mpi ;' > site-config.jam

python run.py --runner=Debian-Sid --bjam-options=-j4 --toolsets=gcc  --tag=master

Thanks,
-Steve