We are moving to a new Ubuntu server (newer Ubuntu version) and the old build is not working. We get tons of errors from c++/9. A couple examples below. Any idea how I get the build (a single .cpp file) to work using g++?
/usr/include/c++/9/array: In function 'bool std::operator<(const std::array<_Tp, _Nm>&, const std::array<_Tp, _Nm>&)':
/usr/include/c++/9/array:264:19: error: 'lexicographical_compare' is not a member of 'std'; did you mean 'lexicographical_compare'?
264 | return std::lexicographical_compare(__a.begin(), __a.end(),
| ^~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/include/c++/9/memory:62,
from /usr/include/unicode/localpointer.h:45,
from /usr/include/unicode/uenum.h:23,
from /usr/include/unicode/ucnv.h:53,
from /usr/include/libxml2/libxml/encoding.h:31,
from /usr/include/libxml2/libxml/parser.h:810,
from /usr/include/libxml2/libxml/xmlerror.h:10,
from /usr/include/libxml2/libxml/xpath.h:26,
from /usr/local/include/libcsoap-1.1/libcsoap/soap-xml.h:27,
from /usr/local/include/libcsoap-1.1/libcsoap/soap-env.h:29,
from /usr/local/include/libcsoap-1.1/libcsoap/soap-client.h:27,
from myapp.cpp:6318:
/usr/include/c++/9/bits/stl_algobase.h:1277:5: note: 'lexicographical_compare' declared here
1277 | lexicographical_compare(_II1 __first1, _II1 __last1,
| ^~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/9/array: In member function 'void std::array<_Tp, _Nm>::fill(const value_type&)':
/usr/include/c++/9/array:117:14: error: 'fill_n' is not a member of 'std'; did you mean 'fill_n'?
117 | { std::fill_n(begin(), size(), __u); }
| ^~~~~~
In file included from /usr/include/c++/9/memory:62,
from /usr/include/unicode/localpointer.h:45,
from /usr/include/unicode/uenum.h:23,
from /usr/include/unicode/ucnv.h:53,
from /usr/include/libxml2/libxml/encoding.h:31,
from /usr/include/libxml2/libxml/parser.h:810,
from /usr/include/libxml2/libxml/xmlerror.h:10,
from /usr/include/libxml2/libxml/xpath.h:26,
from /usr/local/include/libcsoap-1.1/libcsoap/soap-xml.h:27,
from /usr/local/include/libcsoap-1.1/libcsoap/soap-env.h:29,
from /usr/local/include/libcsoap-1.1/libcsoap/soap-client.h:27,
from myapp.cpp:6318: