"g++-6"   -fvisibility-inlines-hidden -std=gnu++11 -fPIC -m64 -pthread -O0 -fno-inline -Wall -fvisibility=hidden  -DBOOST_ALL_NO_LIB=1 -DBOOST_COBALT_USE_STD_PMR=1 -DBOOST_CONTRACT_DYN_LINK -DBOOST_NO_CXX11_VARIADIC_TEMPLATES   -I".." -I"../libs/contract/test/public_function"  -c -o "/var/boost/run/results/boost/bin.v2/libs/contract/test/public_function-overload_no_tva.test/gcc-6~gnu11/debug/x86_64/debug-symbols-off/threading-multi/visibility-hidden/public_function/overload_no_tva.o" "../libs/contract/test/public_function/overload_no_tva.cpp"

In file included from ../boost/none.hpp:17:0,
                 from ../boost/optional/optional.hpp:53,
                 from ../boost/optional.hpp:15,
                 from ../boost/contract/detail/type_traits/optional.hpp:10,
                 from ../boost/contract/detail/condition/cond_post.hpp:15,
                 from ../boost/contract/core/specify.hpp:24,
                 from ../boost/contract/public_function.hpp:17,
                 from ../libs/contract/test/public_function/overload.hpp:10,
                 from ../libs/contract/test/public_function/overload_no_tva.cpp:12:
../boost/none_t.hpp:24:2: error: #error "Boost.Optional requires some C++11 features since version 1.87. If you have an older C++ version use Boost.Optional version 1.86 or earlier."
 #error "Boost.Optional requires some C++11 features since version 1.87. If you have an older C++ version use Boost.Optional version 1.86 or earlier."
  ^~~~~
In file included from ../boost/chrono/config.hpp:15:0,
                 from ../boost/chrono/duration.hpp:33,
                 from ../boost/chrono/time_point.hpp:33,
                 from ../boost/thread/lock_types.hpp:22,
                 from ../boost/thread/pthread/mutex.hpp:16,
                 from ../boost/thread/mutex.hpp:16,
                 from ../boost/contract/detail/checking.hpp:13,
                 from ../boost/contract/detail/operation/static_public_function.hpp:20,
                 from ../boost/contract/public_function.hpp:32,
                 from ../libs/contract/test/public_function/overload.hpp:10,
                 from ../libs/contract/test/public_function/overload_no_tva.cpp:12:
../boost/chrono/detail/requires_cxx11.hpp:19:111: note: #pragma message: C++03 support was deprecated in Boost.Chrono 1.82 and was removed in Boost.Chrono 1.84.
 BOOST_PRAGMA_MESSAGE("C++03 support was deprecated in Boost.Chrono 1.82 and was removed in Boost.Chrono 1.84.")
                                                                                                               ^