Undefined reference to boost::system::generic_category despite linking with boost_system [duplicate]

问题

This question already has answers here:

What is an undefined reference/unresolved external symbol error and how do I fix it? (32 answers)

Closed 4 years ago.

My compilation command is:

g++ -I/home/foo/boost_1_56_0 -L/home/foo/boost_1_56_0/stage/lib -lboost_system -lboost_filesystem -lpthread -lboost_thread -lboost_system -lboost_filesystem -lpthread -lboost_thread main.cpp foo.cpp

I get an undefined reference to boost::system::generic_category error despite the fact that I link it with -lboost_thread.

I also get undefined references to:

boost::system::generic_category and pthread_detach.

回答1:

You should specify the libraries after the source file(s).

Also, prefer -pthread over manually linking libpthread.so

g++ -I/home/foo/boost_1_56_0 -L/home/foo/boost_1_56_0/stage/lib -pthread main.cpp foo.cpp -lboost_system -lboost_filesystem -lboost_thread

来源：https://stackoverflow.com/questions/26317955/undefined-reference-to-boostsystemgeneric-category-despite-linking-with-boos