为什么我的C ++链接器仅在删除boost共享对象文件后才能工作？

Question

When I run 'make' using my NetBeans generated Makefile everything compiles OK but then when we try to link everything together we get an error:

g++     -o dist/Debug/GNU-Linux-x86/hub build/Debug/GNU-Linux-x86/Calculations.o build/Debug/GNU-Linux-x86/Client.o build/Debug/GNU-Linux-x86/Connection.o build/Debug/GNU-Linux-x86/DataStore.o build/Debug/GNU-Linux-x86/Hub.o build/Debug/GNU-Linux-x86/Instruments.o build/Debug/GNU-Linux-x86/Parameters.o build/Debug/GNU-Linux-x86/PricingEngine.o build/Debug/GNU-Linux-x86/Server.o build/Debug/GNU-Linux-x86/main.o build/Debug/GNU-Linux-x86/stdafx.o -L/usr/lib/x86_64-linux-gnu ../Core/dist/Debug/GNU-Linux-x86/libcore.a -pthread -lpq -lzmq -lboost_system -lboost_log -lboost_log_setup -lboost_thread -lboost_filesystem -lboost_unit_test_framework -lQuantLib
build/Debug/GNU-Linux-x86/Connection.o: In function `Hub::Connection::ReadHeaderHandler(boost::system::error_code, unsigned long)':
/home/jj5/arena/Hub/Connection.cpp:35: undefined reference to `boost::log::v2s_mt_posix::trivial::logger::get()'
/home/jj5/arena/Hub/Connection.cpp:35: undefined reference to `boost::log::v2s_mt_posix::trivial::logger::get()'
/home/jj5/arena/Hub/Connection.cpp:42: undefined reference to `boost::log::v2s_mt_posix::trivial::logger::get()'
/home/jj5/arena/Hub/Connection.cpp:42: undefined reference to `boost::log::v2s_mt_posix::trivial::logger::get()'

The problem seems to be a missing boost logging library. Curiously, however, if I delete the Boost shard object files:

root@happiness:/usr/lib/x86_64-linux-gnu# archive libboost_*.so
Archive path is: /root/archive/2015-09-08-200813
Date: Tuesday 8 September  20:08:13 AEST 2015
User: root
Host: happiness
Path: /usr/lib/x86_64-linux-gnu
File: libboost_atomic.so libboost_chrono.so libboost_context.so libboost_date_time.so libboost_filesystem.so libboost_graph_parallel.so libboost_graph.so libboost_iostreams.so libboost_locale.so libboost_log_setup.so libboost_log.so libboost_math_c99f.so libboost_math_c99l.so libboost_math_c99.so libboost_math_tr1f.so libboost_math_tr1l.so libboost_math_tr1.so libboost_mpi_python-py27.so libboost_mpi_python-py34.so libboost_mpi_python.so libboost_mpi.so libboost_prg_exec_monitor.so libboost_program_options.so libboost_python-py27.so libboost_python-py34.so libboost_python.so libboost_random.so libboost_regex.so libboost_serialization.so libboost_signals.so libboost_system.so libboost_thread.so libboost_timer.so libboost_unit_test_framework.so libboost_wave.so libboost_wserialization.so

Then the next time I run make everything compiles and links successfully! Nevertheless, deleting the shared object files seems a little bit drastic... is there some other way?

ps the 'archive' script shown above 'deletes' files by moving them to 'trash', it's similar to rm -rf.

Answer 1

To make linker prefer a static library, you can try this:

-Wl,-Bstatic -lboost_log -lboost_log_setup -Wl,-Bdynamic

Notes:

• I don't see a problem with linking to .a directly, it's not any way less portable than the solution above

• It would seem Boost.Log fails to set default visibility on these symbols, so please make sure this issue is reported.