c++11 - Unusual C++ linker error - 'Defined in discarded section'

Question

I am attempting to link my program executable, but I keep getting errors.

Having

boost::this_thread::sleep(boost::posix_time::milliseconds(10));

in my source code yields the following error in the linker:

`.text._ZN5boost16exception_detail19error_info_injectorISt13runtime_errorED2Ev' referenced in section `.text._ZN5boost16exception_detail19error_info_injectorISt13runtime_errorED1Ev[non-virtual thunk to boost::exception_detail::error_info_injector<std::runtime_error>::~error_info_injector()]' of /usr/local/lib/libboost_thread.a(thread.o): defined in discarded section `.text._ZN5boost16exception_detail19error_info_injectorISt13runtime_errorED2Ev[_ZN5boost16exception_detail19error_info_injectorISt13runtime_errorED5Ev]' of /usr/local/lib/libboost_thread.a(thread.o)
`.text._ZN5boost16exception_detail19error_info_injectorINS_9gregorian16bad_day_of_monthEED2Ev' referenced in section `.text._ZN5boost16exception_detail19error_info_injectorINS_9gregorian16bad_day_of_monthEED1Ev[non-virtual thunk to boost::exception_detail::error_info_injector<boost::gregorian::bad_day_of_month>::~error_info_injector()]' of /usr/local/lib/libboost_thread.a(thread.o): defined in discarded section `.text._ZN5boost16exception_detail19error_info_injectorINS_9gregorian16bad_day_of_monthEED2Ev[_ZN5boost16exception_detail19error_info_injectorINS_9gregorian16bad_day_of_monthEED5Ev]' of /usr/local/lib/libboost_thread.a(thread.o)
`.text._ZN5boost16exception_detail10clone_implINS0_19error_info_injectorINS_9gregorian8bad_yearEEEED2Ev' referenced in section `.text._ZN5boost16exception_detail10clone_implINS0_19error_info_injectorINS_9gregorian8bad_yearEEEED1Ev[non-virtual thunk to boost::exception_detail::clone_impl<boost::exception_detail::error_info_injector<boost::gregorian::bad_year> >::~clone_impl()]' of /usr/local/lib/libboost_thread.a(thread.o): defined in discarded section `.text._ZN5boost16exception_detail10clone_implINS0_19error_info_injectorINS_9gregorian8bad_yearEEEED2Ev[_ZN5boost16exception_detail10clone_implINS0_19error_info_injectorINS_9gregorian8bad_yearEEEED5Ev]' of /usr/local/lib/libboost_thread.a(thread.o)
`.text._ZN5boost16exception_detail10clone_implINS0_19error_info_injectorINS_9gregorian8bad_yearEEEED2Ev' referenced in section `.text._ZN5boost16exception_detail10clone_implINS0_19error_info_injectorINS_9gregorian8bad_yearEEEED1Ev[non-virtual thunk to boost::exception_detail::clone_impl<boost::exception_detail::error_info_injector<boost::gregorian::bad_year> >::~clone_impl()]' of /usr/local/lib/libboost_thread.a(thread.o): defined in discarded section `.text._ZN5boost16exception_detail10clone_implINS0_19error_info_injectorINS_9gregorian8bad_yearEEEED2Ev[_ZN5boost16exception_detail10clone_implINS0_19error_info_injectorINS_9gregorian8bad_yearEEEED5Ev]' of /usr/local/lib/libboost_thread.a(thread.o)
`.text._ZN5boost16exception_detail19error_info_injectorINS_9gregorian8bad_yearEED2Ev' referenced in section `.text._ZN5boost16exception_detail19error_info_injectorINS_9gregorian8bad_yearEED1Ev[non-virtual thunk to boost::exception_detail::error_info_injector<boost::gregorian::bad_year>::~error_info_injector()]' of /usr/local/lib/libboost_thread.a(thread.o): defined in discarded section `.text._ZN5boost16exception_detail19error_info_injectorINS_9gregorian8bad_yearEED2Ev[_ZN5boost16exception_detail19error_info_injectorINS_9gregorian8bad_yearEED5Ev]' of /usr/local/lib/libboost_thread.a(thread.o)
`.text._ZN5boost16exception_detail19error_info_injectorINS_9gregorian9bad_monthEED2Ev' referenced in section `.text._ZN5boost16exception_detail19error_info_injectorINS_9gregorian9bad_monthEED1Ev[non-virtual thunk to boost::exception_detail::error_info_injector<boost::gregorian::bad_month>::~error_info_injector()]' of /usr/local/lib/libboost_thread.a(thread.o): defined in discarded section `.text._ZN5boost16exception_detail19error_info_injectorINS_9gregorian9bad_monthEED2Ev[_ZN5boost16exception_detail19error_info_injectorINS_9gregorian9bad_monthEED5Ev]' of /usr/local/lib/libboost_thread.a(thread.o)
`.text._ZN5boost16exception_detail10clone_implINS0_19error_info_injectorINS_9gregorian16bad_day_of_monthEEEED2Ev' referenced in section `.text._ZN5boost16exception_detail10clone_implINS0_19error_info_injectorINS_9gregorian16bad_day_of_monthEEEED1Ev[non-virtual thunk to boost::exception_detail::clone_impl<boost::exception_detail::error_info_injector<boost::gregorian::bad_day_of_month> >::~clone_impl()]' of /usr/local/lib/libboost_thread.a(thread.o): defined in discarded section `.text._ZN5boost16exception_detail10clone_implINS0_19error_info_injectorINS_9gregorian16bad_day_of_monthEEEED2Ev[_ZN5boost16exception_detail10clone_implINS0_19error_info_injectorINS_9gregorian16bad_day_of_monthEEEED5Ev]' of /usr/local/lib/libboost_thread.a(thread.o)
`.text._ZN5boost16exception_detail10clone_implINS0_19error_info_injectorINS_9gregorian16bad_day_of_monthEEEED2Ev' referenced in section `.text._ZN5boost16exception_detail10clone_implINS0_19error_info_injectorINS_9gregorian16bad_day_of_monthEEEED1Ev[non-virtual thunk to boost::exception_detail::clone_impl<boost::exception_detail::error_info_injector<boost::gregorian::bad_day_of_month> >::~clone_impl()]' of /usr/local/lib/libboost_thread.a(thread.o): defined in discarded section `.text._ZN5boost16exception_detail10clone_implINS0_19error_info_injectorINS_9gregorian16bad_day_of_monthEEEED2Ev[_ZN5boost16exception_detail10clone_implINS0_19error_info_injectorINS_9gregorian16bad_day_of_monthEEEED5Ev]' of /usr/local/lib/libboost_thread.a(thread.o)
`.text._ZN5boost16exception_detail10clone_implINS0_19error_info_injectorISt13runtime_errorEEED2Ev' referenced in section `.text._ZN5boost16exception_detail10clone_implINS0_19error_info_injectorISt13runtime_errorEEED1Ev[non-virtual thunk to boost::exception_detail::clone_impl<boost::exception_detail::error_info_injector<std::runtime_error> >::~clone_impl()]' of /usr/local/lib/libboost_thread.a(thread.o): defined in discarded section `.text._ZN5boost16exception_detail10clone_implINS0_19error_info_injectorISt13runtime_errorEEED2Ev[_ZN5boost16exception_detail10clone_implINS0_19error_info_injectorISt13runtime_errorEEED5Ev]' of /usr/local/lib/libboost_thread.a(thread.o)
`.text._ZN5boost16exception_detail10clone_implINS0_19error_info_injectorISt13runtime_errorEEED2Ev' referenced in section `.text._ZN5boost16exception_detail10clone_implINS0_19error_info_injectorISt13runtime_errorEEED1Ev[non-virtual thunk to boost::exception_detail::clone_impl<boost::exception_detail::error_info_injector<std::runtime_error> >::~clone_impl()]' of /usr/local/lib/libboost_thread.a(thread.o): defined in discarded section `.text._ZN5boost16exception_detail10clone_implINS0_19error_info_injectorISt13runtime_errorEEED2Ev[_ZN5boost16exception_detail10clone_implINS0_19error_info_injectorISt13runtime_errorEEED5Ev]' of /usr/local/lib/libboost_thread.a(thread.o)
`.text._ZN5boost16exception_detail10clone_implINS0_19error_info_injectorINS_9gregorian9bad_monthEEEED2Ev' referenced in section `.text._ZN5boost16exception_detail10clone_implINS0_19error_info_injectorINS_9gregorian9bad_monthEEEED1Ev[non-virtual thunk to boost::exception_detail::clone_impl<boost::exception_detail::error_info_injector<boost::gregorian::bad_month> >::~clone_impl()]' of /usr/local/lib/libboost_thread.a(thread.o): defined in discarded section `.text._ZN5boost16exception_detail10clone_implINS0_19error_info_injectorINS_9gregorian9bad_monthEEEED2Ev[_ZN5boost16exception_detail10clone_implINS0_19error_info_injectorINS_9gregorian9bad_monthEEEED5Ev]' of /usr/local/lib/libboost_thread.a(thread.o)
`.text._ZN5boost16exception_detail10clone_implINS0_19error_info_injectorINS_9gregorian9bad_monthEEEED2Ev' referenced in section `.text._ZN5boost16exception_detail10clone_implINS0_19error_info_injectorINS_9gregorian9bad_monthEEEED1Ev[non-virtual thunk to boost::exception_detail::clone_impl<boost::exception_detail::error_info_injector<boost::gregorian::bad_month> >::~clone_impl()]' of /usr/local/lib/libboost_thread.a(thread.o): defined in discarded section `.text._ZN5boost16exception_detail10clone_implINS0_19error_info_injectorINS_9gregorian9bad_monthEEEED2Ev[_ZN5boost16exception_detail10clone_implINS0_19error_info_injectorINS_9gregorian9bad_monthEEEED5Ev]' of /usr/local/lib/libboost_thread.a(thread.o)

Using boost::thread::condition_variable::wait yields

src/net/libnet.a(semaphore.cpp.o): In function `interruption_checker':
/usr/local/include/boost/thread/pthread/thread_data.hpp:96: undefined reference to `boost::detail::get_current_thread_data()'
src/net/libnet.a(semaphore.cpp.o): In function `boost::condition_variable::wait(boost::unique_lock<boost::mutex>&)':
/usr/local/include/boost/thread/pthread/condition_variable.hpp:57: undefined reference to `boost::this_thread::interruption_point()'
collect2: ld returned 1 exit status

I am using CMake, and it tells me Make issues the following command, which fails:

    /usr/bin/c++       CMakeFiles/rcon.dir/src/main.cpp.o  -o rcon -rdynamic -L/usr/local/lib /usr/local/lib/libboost_system.a /usr/local/lib/libboost_thread.a -lpthread src/net/libnet.a src/log/liblogging.a -Wl,-rpath,/usr/local/lib 

Whatever could be wrong? It is linking in libboost_thread.a?

Update

After moving libnet and liblogging (parts of my program, compiled into static libraries because I thought it was neat) before the boost libraries in the command line removes the undefined errors. However, now I get these when compiling with boost::condition_variable in my code, while the other error is unchanged:

`.text._ZN5boost16exception_detail19error_info_injectorINS_10lock_errorEED2Ev' referenced in section `.text._ZN5boost16exception_detail19error_info_injectorINS_10lock_errorEED1Ev[non-virtual thunk to boost::exception_detail::error_info_injector<boost::lock_error>::~error_info_injector()]' of /usr/local/lib/libboost_thread.a(thread.o): defined in discarded section `.text._ZN5boost16exception_detail19error_info_injectorINS_10lock_errorEED2Ev[_ZN5boost16exception_detail19error_info_injectorINS_10lock_errorEED5Ev]' of /usr/local/lib/libboost_thread.a(thread.o)
`.text._ZN5boost16exception_detail19error_info_injectorISt13runtime_errorED2Ev' referenced in section `.text._ZN5boost16exception_detail19error_info_injectorISt13runtime_errorED1Ev[non-virtual thunk to boost::exception_detail::error_info_injector<std::runtime_error>::~error_info_injector()]' of /usr/local/lib/libboost_thread.a(thread.o): defined in discarded section `.text._ZN5boost16exception_detail19error_info_injectorISt13runtime_errorED2Ev[_ZN5boost16exception_detail19error_info_injectorISt13runtime_errorED5Ev]' of /usr/local/lib/libboost_thread.a(thread.o)
`.text._ZN5boost16exception_detail19error_info_injectorINS_9gregorian16bad_day_of_monthEED2Ev' referenced in section `.text._ZN5boost16exception_detail19error_info_injectorINS_9gregorian16bad_day_of_monthEED1Ev[non-virtual thunk to boost::exception_detail::error_info_injector<boost::gregorian::bad_day_of_month>::~error_info_injector()]' of /usr/local/lib/libboost_thread.a(thread.o): defined in discarded section `.text._ZN5boost16exception_detail19error_info_injectorINS_9gregorian16bad_day_of_monthEED2Ev[_ZN5boost16exception_detail19error_info_injectorINS_9gregorian16bad_day_of_monthEED5Ev]' of /usr/local/lib/libboost_thread.a(thread.o)
`.text._ZN5boost16exception_detail19error_info_injectorINS_21thread_resource_errorEED2Ev' referenced in section `.text._ZN5boost16exception_detail19error_info_injectorINS_21thread_resource_errorEED1Ev[non-virtual thunk to boost::exception_detail::error_info_injector<boost::

Answer 1

Now I'm a bit embarrassed. Apparently, something was wrong with my boost library. Probably, I compiled it with one version of gcc, after which I did an update all. This probably updated GCC with some form of minor incompatibility between the two versions. I could be completely wrong about that though.

I deleted all occurences of boost, and pulled boost from the Archlinux repositories instead, which currently is up to date with the official releases. Now it compiles as it should.

Silly me. :(