"g++-9"   -fvisibility-inlines-hidden -std=c++17 -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_CONTRACT_MAX_ARGS=0 -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-max_args0_no_tva.test/gcc-9~c++17/debug/x86_64/debug-symbols-off/threading-multi/visibility-hidden/public_function/max_args0_no_tva.o" "../libs/contract/test/public_function/max_args0_no_tva.cpp"

In file included from ../boost/none.hpp:17,
                 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/max_args.hpp:10,
                 from ../libs/contract/test/public_function/max_args0_no_tva.cpp:15:
../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."
   24 | #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/none_t.hpp:17,
                 from ../boost/none.hpp:17,
                 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/max_args.hpp:10,
                 from ../libs/contract/test/public_function/max_args0_no_tva.cpp:15:
../boost/config/pragma_message.hpp:24:34: note: #pragma message: C++03 support was deprecated in Boost.Chrono 1.82 and was removed in Boost.Chrono 1.84.
   24 | # define BOOST_PRAGMA_MESSAGE(x) _Pragma(BOOST_STRINGIZE(message(x)))
      |                                  ^~~~~~~
../boost/chrono/detail/requires_cxx11.hpp:19:1: note: in expansion of macro 'BOOST_PRAGMA_MESSAGE'
   19 | BOOST_PRAGMA_MESSAGE("C++03 support was deprecated in Boost.Chrono 1.82 and was removed in Boost.Chrono 1.84.")
      | ^~~~~~~~~~~~~~~~~~~~