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Question

I am encountering problems while compiling a c++ program including boost library. The problems seem to have started occuring after I updated to Catalina, before everything worked correctly.

I use boost installed via homebrew ("brew install boost") and compile the program with g++ version 9 als installed with homebrew.

When compiling with "g++-9 -I/usr/local/include -L/usr/local/lib -lboost_serialization test.cc" the libararies are correctly found by the compiler but the following error occurs. Below I include the error message and the test program that causes it.

An interesting observation is that the name in the error message referenced as "cclgNgf3.o" changes each time I compile. So far I also got "ccmG1kWi.o" and "cc25AYXh.o".

Undefined symbols for architecture x86_64:
  "boost::archive::text_oarchive_impl<boost::archive::text_oarchive>::save(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)", referenced from:
      void boost::archive::save_access::save_primitive<boost::archive::text_oarchive, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >(boost::archive::text_oarchive&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in cclgNgf3.o
  "boost::archive::text_oarchive_impl<boost::archive::text_oarchive>::text_oarchive_impl(std::basic_ostream<char, std::char_traits<char> >&, unsigned int)", referenced from:
      boost::archive::text_oarchive::text_oarchive(std::basic_ostream<char, std::char_traits<char> >&, unsigned int) in cclgNgf3.o
  "boost::archive::basic_text_oprimitive<std::basic_ostream<char, std::char_traits<char> > >::~basic_text_oprimitive()", referenced from:
      boost::archive::text_oarchive_impl<boost::archive::text_oarchive>::~text_oarchive_impl() in cclgNgf3.o
      boost::archive::text_oarchive_impl<boost::archive::text_oarchive>::~text_oarchive_impl() in cclgNgf3.o
ld: symbol(s) not found for architecture x86_64
collect2: error: ld returned 1 exit status

#include <boost/archive/text_oarchive.hpp>
#include <iostream>

using namespace std;

int main(int argc, char **argv)
{
    boost::archive::text_oarchive oa{cout};
    return 0;
}

On the off chance that it might be relevant when compiling with macOS clang compiler by invoking "g++ -lboost_serialization test.cc" a following error message is printed.

test.cc:8:32: error: no matching constructor for initialization of 'boost::archive::text_oarchive'
        boost::archive::text_oarchive oa{cout};
                                      ^
/usr/local/include/boost/archive/text_oarchive.hpp:98:28: note: candidate constructor (the implicit copy constructor) not viable: requires 1
      argument, but 0 were provided
class BOOST_SYMBOL_VISIBLE text_oarchive : 
                           ^
/usr/local/include/boost/archive/text_oarchive.hpp:102:5: note: candidate constructor not viable: requires at least argument 'os_', but no arguments
      were provided
    text_oarchive(std::ostream & os_, unsigned int flags = 0) :
    ^
test.cc:8:34: error: expected ';' at end of declaration
        boost::archive::text_oarchive oa{cout};
                                        ^
                                        ;
2 errors generated.

Answer 1

I built boost manually using gcc instead of clang and now it works. It would appear the brew version is built with clang and so then when I try to build my project using gcc we get the conflicts of standard libraries.