"g++-6"  -ftemplate-depth-512 -fvisibility-inlines-hidden -std=c++14 -Wall -Wextra -fPIC -m64 -pthread -O0 -fno-inline -Wall -fvisibility=hidden -Wno-maybe-uninitialized -DBOOST_ALL_NO_LIB=1 -DBOOST_CHRONO_DYN_LINK=1 -DBOOST_CHRONO_NO_LIB=1 -DBOOST_COBALT_USE_STD_PMR=1 -DBOOST_REGEX_NO_LIB=1 -DBOOST_SYSTEM_DYN_LINK=1 -DBOOST_SYSTEM_NO_LIB=1 -DBOOST_THREAD_BUILD_DLL=1 -DBOOST_THREAD_POSIX -DBOOST_THREAD_USE_DLL=1   -I".." -I"../libs/spirit/test/x3" -I"/var/boost/run/boost_root/libs/assert/include" -I"/var/boost/run/boost_root/libs/bind/include" -I"/var/boost/run/boost_root/libs/chrono/include" -I"/var/boost/run/boost_root/libs/container_hash/include" -I"/var/boost/run/boost_root/libs/core/include" -I"/var/boost/run/boost_root/libs/describe/include" -I"/var/boost/run/boost_root/libs/detail/include" -I"/var/boost/run/boost_root/libs/endian/include" -I"/var/boost/run/boost_root/libs/function/include" -I"/var/boost/run/boost_root/libs/function_types/include" -I"/var/boost/run/boost_root/libs/fusion/include" -I"/var/boost/run/boost_root/libs/integer/include" -I"/var/boost/run/boost_root/libs/iterator/include" -I"/var/boost/run/boost_root/libs/move/include" -I"/var/boost/run/boost_root/libs/mp11/include" -I"/var/boost/run/boost_root/libs/optional/include" -I"/var/boost/run/boost_root/libs/phoenix/include" -I"/var/boost/run/boost_root/libs/predef/include" -I"/var/boost/run/boost_root/libs/ratio/include" -I"/var/boost/run/boost_root/libs/regex/include" -I"/var/boost/run/boost_root/libs/smart_ptr/include" -I"/var/boost/run/boost_root/libs/spirit/include" -I"/var/boost/run/boost_root/libs/system/include" -I"/var/boost/run/boost_root/libs/throw_exception/include" -I"/var/boost/run/boost_root/libs/tuple/include" -I"/var/boost/run/boost_root/libs/type_index/include" -I"/var/boost/run/boost_root/libs/type_traits/include" -I"/var/boost/run/boost_root/libs/unordered/include" -I"/var/boost/run/boost_root/libs/variant/include" -I"/var/boost/run/boost_root/libs/variant2/include" -I"/var/boost/run/boost_root/libs/winapi/include"  -c -o "/var/boost/run/results/boost/bin.v2/libs/spirit/test/x3/x3_grammar_linker.test/gcc-6~c++14~warn/debug/x86_64/debug-symbols-off/threading-multi/visibility-hidden/grammar_linker.o" "../libs/spirit/test/x3/grammar_linker.cpp"

In file included from ../libs/spirit/test/x3/grammar.hpp:1:0,
                 from ../libs/spirit/test/x3/grammar_linker.cpp:8:
../boost/spirit/home/x3.hpp:26:4: warning: #warning "Spirit X3 will soon use C++17 features which your compiler does not support" [-Wcpp]
 #  warning "Spirit X3 will soon use C++17 features which your compiler does not support"
    ^~~~~~~
../boost/spirit/home/x3.hpp:30:4: warning: #warning "Minimal supported compiler versions: Clang 4 / GCC 7 / MSC 1915 (VS 2017 v15.8)" [-Wcpp]
 #  warning "Minimal supported compiler versions: Clang 4 / GCC 7 / MSC 1915 (VS 2017 v15.8)"
    ^~~~~~~
In file included from ../libs/spirit/test/x3/grammar.hpp:1:0,
                 from ../libs/spirit/test/x3/grammar_linker.cpp:8:
../boost/spirit/home/x3.hpp:36:4: warning: #warning "Define BOOST_SPIRIT_X3_HIDE_CXX17_WARNING to hide the warning" [-Wcpp]
 #  warning "Define BOOST_SPIRIT_X3_HIDE_CXX17_WARNING to hide the warning"
    ^~~~~~~
In file included from ../boost/spirit/home/x3/core/skip_over.hpp:12:0,
                 from ../boost/spirit/home/x3/auxiliary/eps.hpp:10,
                 from ../boost/spirit/home/x3/auxiliary.hpp:12,
                 from ../boost/spirit/home/x3.hpp:62,
                 from ../libs/spirit/test/x3/grammar.hpp:1,
                 from ../libs/spirit/test/x3/grammar_linker.cpp:8:
../boost/spirit/home/x3/support/expectation.hpp:40:20: fatal error: optional: No such file or directory
 #include <optional>
                    ^
compilation terminated.