Linker error when adding time parameters to messages

[romancardenas]

I am trying to add fields to messages that provide information about simulation time.
All the new messages have been defined in data_structures/message.cpp and data_structures/message.hpp.

So far, only the main_client_generator_test.cpp test has been adapted to the new message style. However, when compiling using make simulators, The following error is displayed:

rm -f bin/* build/*
g++ -g -c -std=c++17 -I ../../cadmium/include -I ../../DESTimes/include test/main_client_generator_test.cpp -o build/main_client_generator_test.o
g++ -g -c -std=c++17 -I ../../cadmium/include -I ../../DESTimes/include data_structures/message.cpp -o build/message.o
g++ -g -o bin/CLIENT_GENERATOR_TEST build/main_client_generator_test.o build/message.o
Undefined symbols for architecture x86_64:
  "std::__1::basic_ostream<char, std::__1::char_traits<char> >& operator<<<NDTime>(std::__1::basic_ostream<char, std::__1::char_traits<char> >&, newClient<NDTime> const&)", referenced from:
      cadmium::logger::value_or_name<newClient<NDTime>, std::__1::integral_constant<bool, true> >::print(std::__1::basic_ostream<char, std::__1::char_traits<char> >&, newClient<NDTime> const&) in main_client_generator_test.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [tests] Error 1