LIke this:
C:\Projects\boost-git\boost\libs\core\test>b2
toolset=clang,clang-cxx11,gcc,gcc-cxx11,msvc-8.0,msvc-10.0,msvc-11.0,msvc-12.0
[...]
C:/Projects/boost-git/boost/tools/build/src/build\project.jam:262: in
find-jamfile from module project
error: Unable to load Jamfile.
error: Could not find a Jamfile in directory
'/C:/Projects/boost-git/boost/libs/context/config'.
error: Attempted to find it with pattern '[Bb]uild.jam [Jj]amfile.v2
[Jj]amfile[Jj]amfile.jam'.
error: Please consult the documentation at 'http://www.boost.org'.
and then this:
C:/Projects/boost-git/boost/tools/build/src/build\project.jam:280: in
load-jamfile from module project
C:/Projects/boost-git/boost/tools/build/src/build\project.jam:64: in
project.load from module project
C:/Projects/boost-git/boost/libs/log/build\log-architecture.jam:23: in load
from module log-architecture
C:/Projects/boost-git/boost/tools/build/src/kernel\modules.jam:289: in
modules.import from module modules
C:/Projects/boost-git/boost/tools/build/src/build\project.jam:1043: in
import from module Jamfile
..\..\..\libs\log\build\Jamfile.v2:15: in modules.load from module
Jamfile
C:/Projects/boost-git/boost/tools/build/src/build\project.jam:325: in
load-jamfile from module project
C:/Projects/boost-git/boost/tools/build/src/build\project.jam:64: in load
from module project
C:/Projects/boost-git/boost/tools/build/src/build\project.jam:89: in
load-used-projects from module project
C:/Projects/boost-git/boost/tools/build/src/build\project.jam:75: in load
from module project
C:/Projects/boost-git/boost/tools/build/src/build\project.jam:113: in
load-parent from module project
C:/Projects/boost-git/boost/tools/build/src/build\project.jam:464: in
initialize from module project
C:/Projects/boost-git/boost/tools/build/src/build\project.jam:306: in
load-jamfile from module project
C:/Projects/boost-git/boost/tools/build/src/build\project.jam:64: in load
from module project
C:/Projects/boost-git/boost/tools/build/src/build\project.jam:113: in
load-parent from module project
C:/Projects/boost-git/boost/tools/build/src/build\project.jam:464: in
initialize from module project
C:/Projects/boost-git/boost/tools/build/src/build\project.jam:306: in
load-jamfile from module project
C:/Projects/boost-git/boost/tools/build/src/build\project.jam:64: in load
from module project
C:/Projects/boost-git/boost/tools/build/src/build\project.jam:145: in
project.find from module project
C:/Projects/boost-git/boost/tools/build/src\build-system.jam:535: in load
from module build-system
C:\Projects\boost-git\boost\tools\build\src/kernel\modules.jam:289: in
import from module modules
C:\Projects\boost-git\boost\tools\build\src/kernel/bootstrap.jam:139: in
boost-build from module
C:\Projects\boost-git\boost\boost-build.jam:17: in module scope from module
