Question

my make file:

all: hPif clean

hPif : src/main.o src/fann_utils.o src/hashes.o src/Config.o
    g++ src/Config.o src/main.o src/fann_utils.o src/hashes.o  -lfann -L/usr/local/lib -o hPif

Config.o : src/Config.cpp src/Config.h
    g++ -c src/Config.cpp

hashes.o : src/hashes.cpp src/hashes.h
    g++ -c src/hashes.cpp

fann_utils.o: src/fann_utils.cpp fann_utils.h src/Config.h src/hashes.h
    g++ -c src/fann_utils.cpp 

main.o: src/main.cpp src/Config.h src/main.h src/hashes.h
    g++ -c src/main.cpp

clean: 
    rm -rf src/*o
    rm -rf *o

the error I get, upon make:

g++ src/Config.o src/main.o src/fann_utils.o src/hashes.o  -lfann -L/usr/local/lib -o hPif
Undefined symbols:
  "Config::NO_FILE_TRAIN", referenced from:
      _main in main.o
      _main in main.o
  "Config::LEARNING_RATE", referenced from:
      display_help()     in main.o
      train_network_no_file()     in main.o
      train_network()     in main.o
      _main in main.o
.
.
.

detail on code layout here: C++: I have this config class that I want to use between all my CPP files, how do I initialize it?

EDIT:

the code having issues here: http://pastebin.com/PDmHaDaC

Answer 1

I refer you to the accepted answer in the other question where the static variables are properly defined:

Source (Config.cpp):

#include "Config.h"

int Config::OUTPUT_TO_FILE = 0;
int Config::NEED_TO_TRAIN = 0;
int Config::NO_FILE_TRAIN = 0;
int Config::NEED_TO_TEST = 0;

Note the Config:: qualification to the variables.

Compare this to your paste bin page: http://pastebin.com/PDmHaDaC