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I'm trying to make a makefile with multiple files. Can someone help me? The files I have are file1.cpp, file2.h and main.cpp

file1.cpp contains my functions. file2.h contains the declaration of my functions.

main.cpp [includes file2.h in the code] file1.cpp [includes file2.h in the code]

i did 

all: main
gcc -g -Wall -o main main.cpp

but it gives me tons of bugs when i try to compile. my codes works perfectly fine on eclipse.

NewFile
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  • Best answer is right here. http://stackoverflow.com/questions/3202136/using-g-to-compile-multiple-cpp-and-h-files – user3497443 Sep 15 '16 at 10:53

2 Answers2

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you'll need to compile all .cpp files that you use (i assume they are not included somewhere). That way the compiler will know that file1.cpp and main.cpp are used together. Also I would suggest using g++ instead of gcc, because g++ is the specific c++ compiler while gcc supports C and C++.

Try using:

g++ -g -Wall -o main main.cpp file1.cpp

Also I would recommend to use Makefile variables like this:

SOURCES = main.cpp file1.cpp
g++ -g -Wall -o main $(SOURCES)

Hope this helps :)

torpedro
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but it gives me tons of bugs when i try to compile. my codes works perfectly fine on eclipse.

gcc is not a C++ compiler. Use g++ instead.

Your Makefile should look like so, it can leverage implicit rules:

all: main

CXXFLAGS+=-g -Wall
LDLIBS+=-lstdc++
main: file1.o main.o
Brian Cain
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    gcc is a C++ compiler. g++ uses gcc, but just in a way that it treats all files as C++ files (including *.c files) – elimirks Oct 02 '13 at 17:13