"undefined reference to" in G++ Cpp

Solution 1:

g++ main.cpp Help.cpp

You have to tell the compiler all the files that you want it to compile, not just the first one.

Solution 2:

You should add help.o to your g++ line:

g++ -c help.cpp -o help.o
g++ help.o main.cpp

By splitting it to two lines you can save compilation time (in case of larger projects), because you can compile help.cpp only when it was changed. make and Makefile used well will save you a lot of headache:

#Makefile
all: main

main: help main.cpp
    g++ -o main help.o main.cpp

help: help.cpp
    g++ -c -o help.o help.cpp

"undefined reference to" in G++ Cpp

Solution 1:

Solution 2:

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