>>> boost 1.72.0 Extracting
bzcat /home/buildroot/autobuild/instance-1/dl/boost/boost_1_72_0.tar.bz2 | tar --strip-components=1 -C /home/buildroot/autobuild/instance-1/output-1/build/boost-1.72.0   -xf -
>>> boost 1.72.0 Patching

Applying 0001-fix-ambiguous-format-call-on-64bit-builds.patch using patch: 
patching file libs/locale/src/icu/formatter.cpp
Hunk #1 succeeded at 51 with fuzz 1 (offset -7 lines).

Applying 0002-fix-uclibc-eventfd.patch using patch: 
patching file boost/asio/detail/impl/eventfd_select_interrupter.ipp

Applying 0003-fenv.patch using patch: 
patching file boost/config/platform/linux.hpp
Hunk #1 succeeded at 48 (offset 1 line).

Applying 0004-add-riscv-endian-detection.patch using patch: 
patching file boost/predef/other/endian.h
>>> boost 1.72.0 Configuring
(cd /home/buildroot/autobuild/instance-1/output-1/build/boost-1.72.0 && ./bootstrap.sh --with-toolset=gcc --without-icu  --without-libraries=atomic,container,context,contract,coroutine,exception,fiber,graph,graph_parallel,iostreams,locale,log,math,mpi,python,random,regex,serialization,stacktrace,test)
Building Boost.Build engine with toolset gcc... tools/build/src/engine/b2
Unicode/ICU support for Boost.Regex?... disabled.
Generating Boost.Build configuration in project-config.jam for gcc...

Bootstrapping is done. To build, run:

    ./b2
    
To generate header files, run:

    ./b2 headers

To adjust configuration, edit 'project-config.jam'.
Further information:

   - Command line help:
     ./b2 --help
     
   - Getting started guide: 
     http://www.boost.org/more/getting_started/unix-variants.html
     
   - Boost.Build documentation:
     http://www.boost.org/build/

echo "using gcc : `/home/buildroot/autobuild/instance-1/output-1/host/bin/arm-linux-gcc -dumpversion` : /home/buildroot/autobuild/instance-1/output-1/host/bin/arm-linux-g++ : <cxxflags>\"-D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64  -Os  \" <linkflags>\"\" ;" > /home/buildroot/autobuild/instance-1/output-1/build/boost-1.72.0/user-config.jam
echo "" >> /home/buildroot/autobuild/instance-1/output-1/build/boost-1.72.0/user-config.jam
>>> boost 1.72.0 Building
(cd /home/buildroot/autobuild/instance-1/output-1/build/boost-1.72.0 && PATH="/home/buildroot/autobuild/instance-1/output-1/host/bin:/home/buildroot/autobuild/instance-1/output-1/host/sbin:/usr/local/bin:/usr/bin:/bin:/usr/local/games:/usr/games:/home/buildroot/.local/bin" ./tools/build/src/engine/bjam -j4 -q --user-config=/home/buildroot/autobuild/instance-1/output-1/build/boost-1.72.0/user-config.jam --no-cmake-config toolset=gcc threading=multi abi=aapcs variant=release link=shared runtime-link=shared -d+1 --ignore-site-config --layout=system)
Performing configuration checks

    - default address-model    : 32-bit
    - default architecture     : arm

Building the Boost C++ Libraries.


    - lockfree boost::atomic_flag : no

Component configuration:

    - atomic                   : not building
    - chrono                   : building
    - container                : not building
    - context                  : not building
    - contract                 : not building
    - coroutine                : not building
    - date_time                : building
    - exception                : not building
    - fiber                    : not building
    - filesystem               : building
    - graph                    : not building
    - graph_parallel           : not building
    - headers                  : building
    - iostreams                : not building
    - locale                   : not building
    - log                      : not building
    - math                     : not building
    - mpi                      : not building
    - program_options          : building
    - python                   : not building
    - random                   : not building
    - regex                    : not building
    - serialization            : not building
    - stacktrace               : not building
    - system                   : building
    - test                     : not building
    - thread                   : building
    - timer                    : building
    - type_erasure             : building
    - wave                     : building

...patience...
...found 1986 targets...
...updating 164 targets...
gcc.compile.c++ bin.v2/libs/filesystem/build/gcc-7.4.0/release/threading-multi/visibility-hidden/codecvt_error_category.o
In file included from /home/buildroot/autobuild/instance-1/output-1/host/opt/ext-toolchain/arm-buildroot-linux-uclibcgnueabihf/include/c++/7.4.0/arm-buildroot-linux-uclibcgnueabihf/bits/os_defines.h:39:0,
                 from /home/buildroot/autobuild/instance-1/output-1/host/opt/ext-toolchain/arm-buildroot-linux-uclibcgnueabihf/include/c++/7.4.0/arm-buildroot-linux-uclibcgnueabihf/bits/c++config.h:533,
                 from /home/buildroot/autobuild/instance-1/output-1/host/opt/ext-toolchain/arm-buildroot-linux-uclibcgnueabihf/include/c++/7.4.0/cstddef:49,
                 from ./boost/config/compiler/gcc.hpp:165,
                 from ./boost/config.hpp:39,
                 from ./boost/filesystem/config.hpp:28,
                 from libs/filesystem/src/codecvt_error_category.cpp:18:
/home/buildroot/autobuild/instance-1/output-1/host/arm-buildroot-linux-uclibcgnueabihf/sysroot/usr/include/features.h:218:5: warning: #warning requested reentrant code, but thread support was disabled [-Wcpp]
 #   warning requested reentrant code, but thread support was disabled
     ^~~~~~~
gcc.compile.c++ bin.v2/libs/chrono/build/gcc-7.4.0/release/threading-multi/visibility-hidden/chrono.o
In file included from /home/buildroot/autobuild/instance-1/output-1/host/opt/ext-toolchain/arm-buildroot-linux-uclibcgnueabihf/include/c++/7.4.0/arm-buildroot-linux-uclibcgnueabihf/bits/os_defines.h:39:0,
                 from /home/buildroot/autobuild/instance-1/output-1/host/opt/ext-toolchain/arm-buildroot-linux-uclibcgnueabihf/include/c++/7.4.0/arm-buildroot-linux-uclibcgnueabihf/bits/c++config.h:533,
                 from /home/buildroot/autobuild/instance-1/output-1/host/opt/ext-toolchain/arm-buildroot-linux-uclibcgnueabihf/include/c++/7.4.0/cstddef:49,
                 from ./boost/config/compiler/gcc.hpp:165,
                 from ./boost/config.hpp:39,
                 from ./boost/chrono/config.hpp:15,
                 from ./boost/chrono/duration.hpp:33,
                 from ./boost/chrono/chrono.hpp:11,
                 from ./boost/chrono/detail/inlined/chrono.hpp:13,
                 from libs/chrono/src/chrono.cpp:14:
/home/buildroot/autobuild/instance-1/output-1/host/arm-buildroot-linux-uclibcgnueabihf/sysroot/usr/include/features.h:218:5: warning: #warning requested reentrant code, but thread support was disabled [-Wcpp]
 #   warning requested reentrant code, but thread support was disabled
     ^~~~~~~
gcc.compile.c++ bin.v2/libs/filesystem/build/gcc-7.4.0/release/threading-multi/visibility-hidden/exception.o
In file included from /home/buildroot/autobuild/instance-1/output-1/host/opt/ext-toolchain/arm-buildroot-linux-uclibcgnueabihf/include/c++/7.4.0/arm-buildroot-linux-uclibcgnueabihf/bits/os_defines.h:39:0,
                 from /home/buildroot/autobuild/instance-1/output-1/host/opt/ext-toolchain/arm-buildroot-linux-uclibcgnueabihf/include/c++/7.4.0/arm-buildroot-linux-uclibcgnueabihf/bits/c++config.h:533,
                 from /home/buildroot/autobuild/instance-1/output-1/host/opt/ext-toolchain/arm-buildroot-linux-uclibcgnueabihf/include/c++/7.4.0/string:38,
                 from libs/filesystem/src/exception.cpp:11:
/home/buildroot/autobuild/instance-1/output-1/host/arm-buildroot-linux-uclibcgnueabihf/sysroot/usr/include/features.h:218:5: warning: #warning requested reentrant code, but thread support was disabled [-Wcpp]
 #   warning requested reentrant code, but thread support was disabled
     ^~~~~~~
gcc.compile.c++ bin.v2/libs/filesystem/build/gcc-7.4.0/release/threading-multi/visibility-hidden/directory.o
In file included from /home/buildroot/autobuild/instance-1/output-1/host/opt/ext-toolchain/arm-buildroot-linux-uclibcgnueabihf/include/c++/7.4.0/arm-buildroot-linux-uclibcgnueabihf/bits/os_defines.h:39:0,
                 from /home/buildroot/autobuild/instance-1/output-1/host/opt/ext-toolchain/arm-buildroot-linux-uclibcgnueabihf/include/c++/7.4.0/arm-buildroot-linux-uclibcgnueabihf/bits/c++config.h:533,
                 from /home/buildroot/autobuild/instance-1/output-1/host/opt/ext-toolchain/arm-buildroot-linux-uclibcgnueabihf/include/c++/7.4.0/cstddef:49,
                 from ./boost/config/compiler/gcc.hpp:165,
                 from ./boost/config.hpp:39,
                 from ./boost/filesystem/directory.hpp:19,
                 from libs/filesystem/src/directory.cpp:28:
/home/buildroot/autobuild/instance-1/output-1/host/arm-buildroot-linux-uclibcgnueabihf/sysroot/usr/include/features.h:218:5: warning: #warning requested reentrant code, but thread support was disabled [-Wcpp]
 #   warning requested reentrant code, but thread support was disabled
     ^~~~~~~
gcc.compile.c++ bin.v2/libs/filesystem/build/gcc-7.4.0/release/threading-multi/visibility-hidden/path_traits.o
In file included from /home/buildroot/autobuild/instance-1/output-1/host/opt/ext-toolchain/arm-buildroot-linux-uclibcgnueabihf/include/c++/7.4.0/arm-buildroot-linux-uclibcgnueabihf/bits/os_defines.h:39:0,
                 from /home/buildroot/autobuild/instance-1/output-1/host/opt/ext-toolchain/arm-buildroot-linux-uclibcgnueabihf/include/c++/7.4.0/arm-buildroot-linux-uclibcgnueabihf/bits/c++config.h:533,
                 from /home/buildroot/autobuild/instance-1/output-1/host/opt/ext-toolchain/arm-buildroot-linux-uclibcgnueabihf/include/c++/7.4.0/cstddef:49,
                 from ./boost/config/compiler/gcc.hpp:165,
                 from ./boost/config.hpp:39,
                 from ./boost/filesystem/config.hpp:28,
                 from libs/filesystem/src/path_traits.cpp:16:
/home/buildroot/autobuild/instance-1/output-1/host/arm-buildroot-linux-uclibcgnueabihf/sysroot/usr/include/features.h:218:5: warning: #warning requested reentrant code, but thread support was disabled [-Wcpp]
 #   warning requested reentrant code, but thread support was disabled
     ^~~~~~~
gcc.compile.c++ bin.v2/libs/filesystem/build/gcc-7.4.0/release/threading-multi/visibility-hidden/path.o
In file included from /home/buildroot/autobuild/instance-1/output-1/host/opt/ext-toolchain/arm-buildroot-linux-uclibcgnueabihf/include/c++/7.4.0/arm-buildroot-linux-uclibcgnueabihf/bits/os_defines.h:39:0,
                 from /home/buildroot/autobuild/instance-1/output-1/host/opt/ext-toolchain/arm-buildroot-linux-uclibcgnueabihf/include/c++/7.4.0/arm-buildroot-linux-uclibcgnueabihf/bits/c++config.h:533,
                 from /home/buildroot/autobuild/instance-1/output-1/host/opt/ext-toolchain/arm-buildroot-linux-uclibcgnueabihf/include/c++/7.4.0/cstddef:49,
                 from ./boost/config/compiler/gcc.hpp:165,
                 from ./boost/config.hpp:39,
                 from libs/filesystem/src/path.cpp:18:
/home/buildroot/autobuild/instance-1/output-1/host/arm-buildroot-linux-uclibcgnueabihf/sysroot/usr/include/features.h:218:5: warning: #warning requested reentrant code, but thread support was disabled [-Wcpp]
 #   warning requested reentrant code, but thread support was disabled
     ^~~~~~~
gcc.compile.c++ bin.v2/libs/filesystem/build/gcc-7.4.0/release/threading-multi/visibility-hidden/operations.o
In file included from /home/buildroot/autobuild/instance-1/output-1/host/opt/ext-toolchain/arm-buildroot-linux-uclibcgnueabihf/include/c++/7.4.0/arm-buildroot-linux-uclibcgnueabihf/bits/os_defines.h:39:0,
                 from /home/buildroot/autobuild/instance-1/output-1/host/opt/ext-toolchain/arm-buildroot-linux-uclibcgnueabihf/include/c++/7.4.0/arm-buildroot-linux-uclibcgnueabihf/bits/c++config.h:533,
                 from /home/buildroot/autobuild/instance-1/output-1/host/opt/ext-toolchain/arm-buildroot-linux-uclibcgnueabihf/include/c++/7.4.0/cstddef:49,
                 from ./boost/config/compiler/gcc.hpp:165,
                 from ./boost/config.hpp:39,
                 from ./boost/filesystem/config.hpp:28,
                 from libs/filesystem/src/operations.cpp:70:
/home/buildroot/autobuild/instance-1/output-1/host/arm-buildroot-linux-uclibcgnueabihf/sysroot/usr/include/features.h:218:5: warning: #warning requested reentrant code, but thread support was disabled [-Wcpp]
 #   warning requested reentrant code, but thread support was disabled
     ^~~~~~~
gcc.compile.c++ bin.v2/libs/date_time/build/gcc-7.4.0/release/threading-multi/visibility-hidden/gregorian/greg_month.o
In file included from /home/buildroot/autobuild/instance-1/output-1/host/opt/ext-toolchain/arm-buildroot-linux-uclibcgnueabihf/include/c++/7.4.0/arm-buildroot-linux-uclibcgnueabihf/bits/os_defines.h:39:0,
                 from /home/buildroot/autobuild/instance-1/output-1/host/opt/ext-toolchain/arm-buildroot-linux-uclibcgnueabihf/include/c++/7.4.0/arm-buildroot-linux-uclibcgnueabihf/bits/c++config.h:533,
                 from /home/buildroot/autobuild/instance-1/output-1/host/opt/ext-toolchain/arm-buildroot-linux-uclibcgnueabihf/include/c++/7.4.0/exception:37,
                 from ./boost/date_time/constrained_value.hpp:12,
                 from ./boost/date_time/gregorian/greg_month.hpp:12,
                 from libs/date_time/src/gregorian/greg_month.cpp:14:
/home/buildroot/autobuild/instance-1/output-1/host/arm-buildroot-linux-uclibcgnueabihf/sysroot/usr/include/features.h:218:5: warning: #warning requested reentrant code, but thread support was disabled [-Wcpp]
 #   warning requested reentrant code, but thread support was disabled
     ^~~~~~~
gcc.compile.c++ bin.v2/libs/filesystem/build/gcc-7.4.0/release/threading-multi/visibility-hidden/windows_file_codecvt.o
In file included from /home/buildroot/autobuild/instance-1/output-1/host/opt/ext-toolchain/arm-buildroot-linux-uclibcgnueabihf/include/c++/7.4.0/arm-buildroot-linux-uclibcgnueabihf/bits/os_defines.h:39:0,
                 from /home/buildroot/autobuild/instance-1/output-1/host/opt/ext-toolchain/arm-buildroot-linux-uclibcgnueabihf/include/c++/7.4.0/arm-buildroot-linux-uclibcgnueabihf/bits/c++config.h:533,
                 from /home/buildroot/autobuild/instance-1/output-1/host/opt/ext-toolchain/arm-buildroot-linux-uclibcgnueabihf/include/c++/7.4.0/cstddef:49,
                 from ./boost/config/compiler/gcc.hpp:165,
                 from ./boost/config.hpp:39,
                 from ./boost/filesystem/config.hpp:28,
                 from libs/filesystem/src/windows_file_codecvt.cpp:22:
/home/buildroot/autobuild/instance-1/output-1/host/arm-buildroot-linux-uclibcgnueabihf/sysroot/usr/include/features.h:218:5: warning: #warning requested reentrant code, but thread support was disabled [-Wcpp]
 #   warning requested reentrant code, but thread support was disabled
     ^~~~~~~
gcc.compile.c++ bin.v2/libs/filesystem/build/gcc-7.4.0/release/threading-multi/visibility-hidden/utf8_codecvt_facet.o
In file included from /home/buildroot/autobuild/instance-1/output-1/host/opt/ext-toolchain/arm-buildroot-linux-uclibcgnueabihf/include/c++/7.4.0/arm-buildroot-linux-uclibcgnueabihf/bits/os_defines.h:39:0,
                 from /home/buildroot/autobuild/instance-1/output-1/host/opt/ext-toolchain/arm-buildroot-linux-uclibcgnueabihf/include/c++/7.4.0/arm-buildroot-linux-uclibcgnueabihf/bits/c++config.h:533,
                 from /home/buildroot/autobuild/instance-1/output-1/host/opt/ext-toolchain/arm-buildroot-linux-uclibcgnueabihf/include/c++/7.4.0/cstddef:49,
                 from ./boost/config/compiler/gcc.hpp:165,
                 from ./boost/config.hpp:39,
                 from ./boost/filesystem/config.hpp:28,
                 from libs/filesystem/src/utf8_codecvt_facet.cpp:14:
/home/buildroot/autobuild/instance-1/output-1/host/arm-buildroot-linux-uclibcgnueabihf/sysroot/usr/include/features.h:218:5: warning: #warning requested reentrant code, but thread support was disabled [-Wcpp]
 #   warning requested reentrant code, but thread support was disabled
     ^~~~~~~
gcc.compile.c++ bin.v2/libs/filesystem/build/gcc-7.4.0/release/threading-multi/visibility-hidden/portability.o
In file included from /home/buildroot/autobuild/instance-1/output-1/host/opt/ext-toolchain/arm-buildroot-linux-uclibcgnueabihf/include/c++/7.4.0/arm-buildroot-linux-uclibcgnueabihf/bits/os_defines.h:39:0,
                 from /home/buildroot/autobuild/instance-1/output-1/host/opt/ext-toolchain/arm-buildroot-linux-uclibcgnueabihf/include/c++/7.4.0/arm-buildroot-linux-uclibcgnueabihf/bits/c++config.h:533,
                 from /home/buildroot/autobuild/instance-1/output-1/host/opt/ext-toolchain/arm-buildroot-linux-uclibcgnueabihf/include/c++/7.4.0/cstddef:49,
                 from ./boost/config/compiler/gcc.hpp:165,
                 from ./boost/config.hpp:39,
                 from ./boost/filesystem/config.hpp:28,
                 from libs/filesystem/src/portability.cpp:16:
/home/buildroot/autobuild/instance-1/output-1/host/arm-buildroot-linux-uclibcgnueabihf/sysroot/usr/include/features.h:218:5: warning: #warning requested reentrant code, but thread support was disabled [-Wcpp]
 #   warning requested reentrant code, but thread support was disabled
     ^~~~~~~
gcc.compile.c++ bin.v2/libs/date_time/build/gcc-7.4.0/release/threading-multi/visibility-hidden/gregorian/greg_weekday.o
In file included from /home/buildroot/autobuild/instance-1/output-1/host/opt/ext-toolchain/arm-buildroot-linux-uclibcgnueabihf/include/c++/7.4.0/arm-buildroot-linux-uclibcgnueabihf/bits/os_defines.h:39:0,
                 from /home/buildroot/autobuild/instance-1/output-1/host/opt/ext-toolchain/arm-buildroot-linux-uclibcgnueabihf/include/c++/7.4.0/arm-buildroot-linux-uclibcgnueabihf/bits/c++config.h:533,
                 from /home/buildroot/autobuild/instance-1/output-1/host/opt/ext-toolchain/arm-buildroot-linux-uclibcgnueabihf/include/c++/7.4.0/exception:37,
                 from ./boost/date_time/constrained_value.hpp:12,
                 from ./boost/date_time/gregorian/greg_weekday.hpp:12,
                 from libs/date_time/src/gregorian/greg_weekday.cpp:14:
/home/buildroot/autobuild/instance-1/output-1/host/arm-buildroot-linux-uclibcgnueabihf/sysroot/usr/include/features.h:218:5: warning: #warning requested reentrant code, but thread support was disabled [-Wcpp]
 #   warning requested reentrant code, but thread support was disabled
     ^~~~~~~
gcc.compile.c++ bin.v2/libs/chrono/build/gcc-7.4.0/release/threading-multi/visibility-hidden/thread_clock.o
In file included from /home/buildroot/autobuild/instance-1/output-1/host/opt/ext-toolchain/arm-buildroot-linux-uclibcgnueabihf/include/c++/7.4.0/arm-buildroot-linux-uclibcgnueabihf/bits/os_defines.h:39:0,
                 from /home/buildroot/autobuild/instance-1/output-1/host/opt/ext-toolchain/arm-buildroot-linux-uclibcgnueabihf/include/c++/7.4.0/arm-buildroot-linux-uclibcgnueabihf/bits/c++config.h:533,
                 from /home/buildroot/autobuild/instance-1/output-1/host/opt/ext-toolchain/arm-buildroot-linux-uclibcgnueabihf/include/c++/7.4.0/cstddef:49,
                 from ./boost/config/compiler/gcc.hpp:165,
                 from ./boost/config.hpp:39,
                 from ./boost/chrono/config.hpp:15,
                 from ./boost/chrono/detail/inlined/thread_clock.hpp:14,
                 from libs/chrono/src/thread_clock.cpp:18:
/home/buildroot/autobuild/instance-1/output-1/host/arm-buildroot-linux-uclibcgnueabihf/sysroot/usr/include/features.h:218:5: warning: #warning requested reentrant code, but thread support was disabled [-Wcpp]
 #   warning requested reentrant code, but thread support was disabled
     ^~~~~~~
gcc.compile.c++ bin.v2/libs/date_time/build/gcc-7.4.0/release/threading-multi/visibility-hidden/gregorian/date_generators.o
In file included from /home/buildroot/autobuild/instance-1/output-1/host/opt/ext-toolchain/arm-buildroot-linux-uclibcgnueabihf/include/c++/7.4.0/arm-buildroot-linux-uclibcgnueabihf/bits/os_defines.h:39:0,
                 from /home/buildroot/autobuild/instance-1/output-1/host/opt/ext-toolchain/arm-buildroot-linux-uclibcgnueabihf/include/c++/7.4.0/arm-buildroot-linux-uclibcgnueabihf/bits/c++config.h:533,
                 from /home/buildroot/autobuild/instance-1/output-1/host/opt/ext-toolchain/arm-buildroot-linux-uclibcgnueabihf/include/c++/7.4.0/exception:37,
                 from /home/buildroot/autobuild/instance-1/output-1/host/opt/ext-toolchain/arm-buildroot-linux-uclibcgnueabihf/include/c++/7.4.0/stdexcept:38,
                 from ./boost/date_time/date_generators.hpp:16,
                 from libs/date_time/src/gregorian/date_generators.cpp:14:
/home/buildroot/autobuild/instance-1/output-1/host/arm-buildroot-linux-uclibcgnueabihf/sysroot/usr/include/features.h:218:5: warning: #warning requested reentrant code, but thread support was disabled [-Wcpp]
 #   warning requested reentrant code, but thread support was disabled
     ^~~~~~~
gcc.link.dll bin.v2/libs/date_time/build/gcc-7.4.0/release/threading-multi/visibility-hidden/libboost_date_time.so.1.72.0
/home/buildroot/autobuild/instance-1/output-1/host/opt/ext-toolchain/bin/../lib/gcc/arm-buildroot-linux-uclibcgnueabihf/7.4.0/../../../../arm-buildroot-linux-uclibcgnueabihf/bin/ld: cannot find -lpthread
collect2: error: ld returned 1 exit status

    "/home/buildroot/autobuild/instance-1/output-1/host/bin/arm-linux-g++"    -o "bin.v2/libs/date_time/build/gcc-7.4.0/release/threading-multi/visibility-hidden/libboost_date_time.so.1.72.0" -Wl,-h -Wl,libboost_date_time.so.1.72.0 -shared -Wl,--start-group "bin.v2/libs/date_time/build/gcc-7.4.0/release/threading-multi/visibility-hidden/gregorian/greg_month.o" "bin.v2/libs/date_time/build/gcc-7.4.0/release/threading-multi/visibility-hidden/gregorian/greg_weekday.o" "bin.v2/libs/date_time/build/gcc-7.4.0/release/threading-multi/visibility-hidden/gregorian/date_generators.o"  -Wl,-Bstatic  -Wl,-Bdynamic -lrt -Wl,--end-group -fPIC -pthread -fvisibility=hidden -fvisibility-inlines-hidden  

...failed gcc.link.dll bin.v2/libs/date_time/build/gcc-7.4.0/release/threading-multi/visibility-hidden/libboost_date_time.so.1.72.0...
...skipped <p/home/buildroot/autobuild/instance-1/output-1/build/boost-1.72.0/stage/lib>libboost_date_time.so.1.72.0 for lack of <pbin.v2/libs/date_time/build/gcc-7.4.0/release/threading-multi/visibility-hidden>libboost_date_time.so.1.72.0...
...skipped <p/home/buildroot/autobuild/instance-1/output-1/build/boost-1.72.0/stage/lib>libboost_date_time.so.1 for lack of <p/home/buildroot/autobuild/instance-1/output-1/build/boost-1.72.0/stage/lib>libboost_date_time.so.1.72.0...
gcc.compile.c++ bin.v2/libs/filesystem/build/gcc-7.4.0/release/threading-multi/visibility-hidden/unique_path.o
In file included from /home/buildroot/autobuild/instance-1/output-1/host/opt/ext-toolchain/arm-buildroot-linux-uclibcgnueabihf/include/c++/7.4.0/arm-buildroot-linux-uclibcgnueabihf/bits/os_defines.h:39:0,
                 from /home/buildroot/autobuild/instance-1/output-1/host/opt/ext-toolchain/arm-buildroot-linux-uclibcgnueabihf/include/c++/7.4.0/arm-buildroot-linux-uclibcgnueabihf/bits/c++config.h:533,
                 from /home/buildroot/autobuild/instance-1/output-1/host/opt/ext-toolchain/arm-buildroot-linux-uclibcgnueabihf/include/c++/7.4.0/cstddef:49,
                 from ./boost/config/compiler/gcc.hpp:165,
                 from ./boost/config.hpp:39,
                 from ./boost/filesystem/operations.hpp:18,
                 from libs/filesystem/src/unique_path.cpp:16:
/home/buildroot/autobuild/instance-1/output-1/host/arm-buildroot-linux-uclibcgnueabihf/sysroot/usr/include/features.h:218:5: warning: #warning requested reentrant code, but thread support was disabled [-Wcpp]
 #   warning requested reentrant code, but thread support was disabled
     ^~~~~~~
gcc.link.dll bin.v2/libs/filesystem/build/gcc-7.4.0/release/threading-multi/visibility-hidden/libboost_filesystem.so.1.72.0
/home/buildroot/autobuild/instance-1/output-1/host/opt/ext-toolchain/bin/../lib/gcc/arm-buildroot-linux-uclibcgnueabihf/7.4.0/../../../../arm-buildroot-linux-uclibcgnueabihf/bin/ld: cannot find -lpthread
collect2: error: ld returned 1 exit status

    "/home/buildroot/autobuild/instance-1/output-1/host/bin/arm-linux-g++"    -o "bin.v2/libs/filesystem/build/gcc-7.4.0/release/threading-multi/visibility-hidden/libboost_filesystem.so.1.72.0" -Wl,-h -Wl,libboost_filesystem.so.1.72.0 -shared -Wl,--start-group "bin.v2/libs/filesystem/build/gcc-7.4.0/release/threading-multi/visibility-hidden/codecvt_error_category.o" "bin.v2/libs/filesystem/build/gcc-7.4.0/release/threading-multi/visibility-hidden/exception.o" "bin.v2/libs/filesystem/build/gcc-7.4.0/release/threading-multi/visibility-hidden/directory.o" "bin.v2/libs/filesystem/build/gcc-7.4.0/release/threading-multi/visibility-hidden/operations.o" "bin.v2/libs/filesystem/build/gcc-7.4.0/release/threading-multi/visibility-hidden/path.o" "bin.v2/libs/filesystem/build/gcc-7.4.0/release/threading-multi/visibility-hidden/path_traits.o" "bin.v2/libs/filesystem/build/gcc-7.4.0/release/threading-multi/visibility-hidden/portability.o" "bin.v2/libs/filesystem/build/gcc-7.4.0/release/threading-multi/visibility-hidden/unique_path.o" "bin.v2/libs/filesystem/build/gcc-7.4.0/release/threading-multi/visibility-hidden/utf8_codecvt_facet.o" "bin.v2/libs/filesystem/build/gcc-7.4.0/release/threading-multi/visibility-hidden/windows_file_codecvt.o"  -Wl,-Bstatic  -Wl,-Bdynamic -lrt -Wl,--end-group -fPIC -pthread -fvisibility=hidden -fvisibility-inlines-hidden  

...failed gcc.link.dll bin.v2/libs/filesystem/build/gcc-7.4.0/release/threading-multi/visibility-hidden/libboost_filesystem.so.1.72.0...
...skipped <p/home/buildroot/autobuild/instance-1/output-1/build/boost-1.72.0/stage/lib>libboost_filesystem.so.1.72.0 for lack of <pbin.v2/libs/filesystem/build/gcc-7.4.0/release/threading-multi/visibility-hidden>libboost_filesystem.so.1.72.0...
...skipped <p/home/buildroot/autobuild/instance-1/output-1/build/boost-1.72.0/stage/lib>libboost_filesystem.so.1 for lack of <p/home/buildroot/autobuild/instance-1/output-1/build/boost-1.72.0/stage/lib>libboost_filesystem.so.1.72.0...
gcc.compile.c++ bin.v2/libs/chrono/build/gcc-7.4.0/release/threading-multi/visibility-hidden/process_cpu_clocks.o
In file included from /home/buildroot/autobuild/instance-1/output-1/host/opt/ext-toolchain/arm-buildroot-linux-uclibcgnueabihf/include/c++/7.4.0/arm-buildroot-linux-uclibcgnueabihf/bits/os_defines.h:39:0,
                 from /home/buildroot/autobuild/instance-1/output-1/host/opt/ext-toolchain/arm-buildroot-linux-uclibcgnueabihf/include/c++/7.4.0/arm-buildroot-linux-uclibcgnueabihf/bits/c++config.h:533,
                 from /home/buildroot/autobuild/instance-1/output-1/host/opt/ext-toolchain/arm-buildroot-linux-uclibcgnueabihf/include/c++/7.4.0/cstddef:49,
                 from ./boost/config/compiler/gcc.hpp:165,
                 from ./boost/config.hpp:39,
                 from ./boost/chrono/config.hpp:15,
                 from ./boost/chrono/detail/inlined/process_cpu_clocks.hpp:15,
                 from libs/chrono/src/process_cpu_clocks.cpp:17:
/home/buildroot/autobuild/instance-1/output-1/host/arm-buildroot-linux-uclibcgnueabihf/sysroot/usr/include/features.h:218:5: warning: #warning requested reentrant code, but thread support was disabled [-Wcpp]
 #   warning requested reentrant code, but thread support was disabled
     ^~~~~~~
gcc.link.dll bin.v2/libs/chrono/build/gcc-7.4.0/release/threading-multi/visibility-hidden/libboost_chrono.so.1.72.0
/home/buildroot/autobuild/instance-1/output-1/host/opt/ext-toolchain/bin/../lib/gcc/arm-buildroot-linux-uclibcgnueabihf/7.4.0/../../../../arm-buildroot-linux-uclibcgnueabihf/bin/ld: cannot find -lpthread
collect2: error: ld returned 1 exit status

    "/home/buildroot/autobuild/instance-1/output-1/host/bin/arm-linux-g++"    -o "bin.v2/libs/chrono/build/gcc-7.4.0/release/threading-multi/visibility-hidden/libboost_chrono.so.1.72.0" -Wl,-h -Wl,libboost_chrono.so.1.72.0 -shared -Wl,--start-group "bin.v2/libs/chrono/build/gcc-7.4.0/release/threading-multi/visibility-hidden/chrono.o" "bin.v2/libs/chrono/build/gcc-7.4.0/release/threading-multi/visibility-hidden/thread_clock.o" "bin.v2/libs/chrono/build/gcc-7.4.0/release/threading-multi/visibility-hidden/process_cpu_clocks.o"  -Wl,-Bstatic  -Wl,-Bdynamic -lrt -Wl,--end-group -fPIC -pthread -fvisibility=hidden -fvisibility-inlines-hidden  -lrt -lpthread

...failed gcc.link.dll bin.v2/libs/chrono/build/gcc-7.4.0/release/threading-multi/visibility-hidden/libboost_chrono.so.1.72.0...
...skipped <p/home/buildroot/autobuild/instance-1/output-1/build/boost-1.72.0/stage/lib>libboost_chrono.so.1.72.0 for lack of <pbin.v2/libs/chrono/build/gcc-7.4.0/release/threading-multi/visibility-hidden>libboost_chrono.so.1.72.0...
...skipped <p/home/buildroot/autobuild/instance-1/output-1/build/boost-1.72.0/stage/lib>libboost_chrono.so.1 for lack of <p/home/buildroot/autobuild/instance-1/output-1/build/boost-1.72.0/stage/lib>libboost_chrono.so.1.72.0...
gcc.compile.c++ bin.v2/libs/program_options/build/gcc-7.4.0/release/threading-multi/visibility-hidden/cmdline.o
In file included from /home/buildroot/autobuild/instance-1/output-1/host/opt/ext-toolchain/arm-buildroot-linux-uclibcgnueabihf/include/c++/7.4.0/arm-buildroot-linux-uclibcgnueabihf/bits/os_defines.h:39:0,
                 from /home/buildroot/autobuild/instance-1/output-1/host/opt/ext-toolchain/arm-buildroot-linux-uclibcgnueabihf/include/c++/7.4.0/arm-buildroot-linux-uclibcgnueabihf/bits/c++config.h:533,
                 from /home/buildroot/autobuild/instance-1/output-1/host/opt/ext-toolchain/arm-buildroot-linux-uclibcgnueabihf/include/c++/7.4.0/cstddef:49,
                 from ./boost/config/compiler/gcc.hpp:165,
                 from ./boost/config.hpp:39,
                 from ./boost/program_options/config.hpp:10,
                 from libs/program_options/src/cmdline.cpp:7:
/home/buildroot/autobuild/instance-1/output-1/host/arm-buildroot-linux-uclibcgnueabihf/sysroot/usr/include/features.h:218:5: warning: #warning requested reentrant code, but thread support was disabled [-Wcpp]
 #   warning requested reentrant code, but thread support was disabled
     ^~~~~~~
...failed updating 3 targets...
...skipped 6 targets...
...updated 44 targets...
package/pkg-generic.mk:257: recipe for target '/home/buildroot/autobuild/instance-1/output-1/build/boost-1.72.0/.stamp_built' failed
make: *** [/home/buildroot/autobuild/instance-1/output-1/build/boost-1.72.0/.stamp_built] Error 1
make: Leaving directory '/home/buildroot/autobuild/instance-1/buildroot'