undefined reference with boost when I try to compile

Question

i have lot of errors when i try to compile my server with boost. Here, this is my makefile :

NAME    =       serveur

SRCS    =       Serveur/main.cpp                \
                Serveur/Client.cpp              \
                Serveur/Commande.cpp            \
                Serveur/My_exception.cpp        \
                Serveur/Network.cpp             \
                Serveur/Server.cpp

#####################################################                                                                                                                                                          

OBJS                    =       $(SRCS:.cpp=.o)
CC                      =       g++
RM                      =       rm -f
CFLAGS                  =       -g -W -Wall -Werror
INCL                    =       ./Serveur/boost_1_47_0
LIB                     =       ./Serveur/boost_1_47_0/stage/lib/
NLIB                    =       -lboost_system -lboost_system-mt -lboost_filesystem -lboost_filesystem-mt

#####################################################                                                                                                                                                          

$(NAME) :       $(OBJS)
        @$(CC) $(OBJS) -I$(INCL) -L$(LIB) $(NLIB) -o $(NAME)
        @printf "\n \033[33m[Message]\033[39m Compilation under Linux done\n\n"

.cpp.o  :
        @$(CC) $(CFLAGS) -I$(INCL) -L$(LIB) $(NLIB) -c $< -o $@
        @printf " \033[34m[Compilation]\033[39m %s\n" $<

re      :       fclean all

all     :       $(NAME)

clean   :
        @$(RM) *~ $(OBJS)
        @printf " \033[31m[Delete] \033[39m%s\n" $(OBJS)

fclean  :       clean
        @$(RM) $(NAME)
        @printf "\n \033[31m[Delete] \033[39m%s\n\n" $(NAME)

After "googling" i found that it's necessary to put -lboost_filesystem but it's not working again and there are next errors :

Serveur/main.o: In function `__static_initialization_and_destruction_0':
/home/abad_a//rendulocal/tech3/cpp/babel-2014-abad_a/Serveur/./Serveur/boost_1_47_0/boost/system/error_code.hpp:214: undefined reference to `boost::system::generic_category()'
/home/abad_a//rendulocal/tech3/cpp/babel-2014-abad_a/Serveur/./Serveur/boost_1_47_0/boost/system/error_code.hpp:215: undefined reference to `boost::system::generic_category()'
/home/abad_a//rendulocal/tech3/cpp/babel-2014-abad_a/Serveur/./Serveur/boost_1_47_0/boost/system/error_code.hpp:216: undefined reference to `boost::system::system_category()'
Serveur/main.o: In function `error_code':
/home/abad_a//rendulocal/tech3/cpp/babel-2014-abad_a/Serveur/./Serveur/boost_1_47_0/boost/system/error_code.hpp:315: undefined reference to `boost::system::system_category()'
Serveur/main.o: In function `boost::asio::error::get_system_category()':
/home/abad_a//rendulocal/tech3/cpp/babel-2014-abad_a/Serveur/./Serveur/boost_1_47_0/boost/asio/error.hpp:216: undefined reference to `boost::system::system_category()'
Serveur/Client.o: In function `__static_initialization_and_destruction_0':
/home/abad_a//rendulocal/tech3/cpp/babel-2014-abad_a/Serveur/./Serveur/boost_1_47_0/boost/system/error_code.hpp:214: undefined reference to `boost::system::generic_category()'
/home/abad_a//rendulocal/tech3/cpp/babel-2014-abad_a/Serveur/./Serveur/boost_1_47_0/boost/system/error_code.hpp:215: undefined reference to `boost::system::generic_category()'
/home/abad_a//rendulocal/tech3/cpp/babel-2014-abad_a/Serveur/./Serveur/boost_1_47_0/boost/system/error_code.hpp:216: undefined reference to `boost::system::system_category()'
Serveur/Network.o: In function `__static_initialization_and_destruction_0':
/home/abad_a//rendulocal/tech3/cpp/babel-2014-abad_a/Serveur/./Serveur/boost_1_47_0/boost/system/error_code.hpp:214: undefined reference to `boost::system::generic_category()'
/home/abad_a//rendulocal/tech3/cpp/babel-2014-abad_a/Serveur/./Serveur/boost_1_47_0/boost/system/error_code.hpp:215: undefined reference to `boost::system::generic_category()'
/home/abad_a//rendulocal/tech3/cpp/babel-2014-abad_a/Serveur/./Serveur/boost_1_47_0/boost/system/error_code.hpp:216: undefined reference to `boost::system::system_category()'
Serveur/Server.o: In function `__static_initialization_and_destruction_0':
/home/abad_a//rendulocal/tech3/cpp/babel-2014-abad_a/Serveur/./Serveur/boost_1_47_0/boost/system/error_code.hpp:214: undefined reference to `boost::system::generic_category()'
/home/abad_a//rendulocal/tech3/cpp/babel-2014-abad_a/Serveur/./Serveur/boost_1_47_0/boost/system/error_code.hpp:215: undefined reference to `boost::system::generic_category()'
/home/abad_a//rendulocal/tech3/cpp/babel-2014-abad_a/Serveur/./Serveur/boost_1_47_0/boost/system/error_code.hpp:216: undefined reference to `boost::system::system_category()'
collect2: ld returned 1 exit status
make: *** [serveur] Error 1

Anyone know why it's not working?

Answer 1

boost::filesystem depends on boost::system, so you'll have to add -lboost_system, also.

Answer 2

I am using cygwin and the solution to this problem was linking the libraries

libboost_filesystem-mt
libboost_system-mt

The invocation of the linker looked like this:

g++  -o "bin.exe"  ./src/reader.o  ./src/bin.o -llibboost_filesystem-mt -llibboost_system-mt