C++ Boost: undefined reference to boost::system::generic_category()

Question

I am trying to include Boost libraries in my project and have been facing issues in the same. I am on Ubuntu 12.10 with Codeblocks IDE and tried installing the libraries manually reading instructions from the site, but was getting error's with header as well as to-be-built-before-use libraries.

I then installed the libraries via terminalby sudo apt-get install libboost-all-dev. After this, in my programs on Codeblocks, I can include headers like #include <boost/regex.hpp> but when I try to include the header for the Filesystem library ( #include "boost/filesystem/operations.hpp" ), I am getting the following error:

/usr/include/boost/system/error_code.hpp|214|undefined reference to boost::system::generic_category()'| 

I am not sure how to resolve this error (specifically in Codeblocks on Linux). I really could use some help here.

Compiler : Gcc
Program code: Only tried inlcuding the above file system operations.hpp file.

Build log from Codeblocks:

Build started on: 20-11-2012 at 18:02.53 Build ended on: 20-11-2012 at 18:02.54 -------------- Build: Debug in libopenFrameworks --------------- Target is up to date. -------------- Build: Debug in reader1 --------------- make -s -f Makefile Debug linking i686 bin/reader1_debug linux obj/i686Debug/src/testApp.o: In function `__static_initialization_and_destruction_0': /usr/include/boost/system/error_code.hpp:214: undefined reference to `boost::system::generic_category()' /usr/include/boost/system/error_code.hpp:215: undefined reference to `boost::system::generic_category()' /usr/include/boost/system/error_code.hpp:216: undefined reference to `boost::system::system_category()' obj/i686Debug/src/main.o: In function `__static_initialization_and_destruction_0': /usr/include/boost/system/error_code.hpp:214: undefined reference to `boost::system::generic_category()' /usr/include/boost/system/error_code.hpp:215: undefined reference to `boost::system::generic_category()' /usr/include/boost/system/error_code.hpp:216: undefined reference to `boost::system::system_category()' collect2: ld returned 1 exit status make: *** [bin/reader1_debug] Error 1 Process terminated with status 2 (0 minutes, 1 seconds) 6 errors, 0 warnings 

Answer 1

You should link in the libboost_system library. I am not sure about codeblocks, but the g++ command-line option on your platform would be

-lboost_system

Answer 2

Depending on the boost version libboost-system comes with the -mt suffix which should indicate the libraries multithreading capability.

So if -lboost_system cannot be found by the linker try -lboost_system-mt.