I passed arguments "--prefix=C:/Boost" and "--build-dir=C:/Boost_Build", and I have no Boost directory right now even after the build completed. And I had that same "failed updating 44 targets" error again too. But I do have .lib files for the following libraries in the stage/lib directory in C:/boost_1_69_0:
I have never built boost for Windows using clang (I always build on Linux with mingw) and I see that it is not part of the regular tests: https://www.boost.org/development/tests/master/developer/summary.html Also I always add --without-python which is the first failed library you have, do you need it? I always add to b2: --layout=system --user-config=user-config.jam --without-mpi --without-python --without-context --without-coroutine link=static threading=multi runtime-link=shared target-os=windows threadapi=win32 variant=release With this, I have no failure and "...updated 15340 targets..." for 1.68.0. Good luck, F