gcc - undefined reference to YAML::LoadFile

Question

I'm trying to use the new version of libyaml-cpp and having linker problems (undefined reference to 'YAML::LoadFile(std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)').

I build the library as follows:

cmake -DBUILD_SHARED_LIBS=ON ..
make
sudo make install

Then I include yaml-cpp/yaml.h and call YAML::LoadFile( some_string );. My compilation line is:

g++ -L/usr/local/lib -I/usr/local/include -lyaml-cpp -std=c++0x -o $@  $^

I've tried putting the exact .so file in there as well with no luck. Using nm I can see a LoadFile function in the shared library. I can't figure out now if I'm somehow using the wrong build line or there is something wrong with the library.

Answer 1

It's an ordering problem on the command-line. I guess I'll just never understand GCC command-line logic. Simply putting the library at the end seems to work:

g++ -L/usr/local/lib -I/usr/local/include -std=c++0x -o $@  $^ -lyaml-cpp