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Old 18th October 2008
JMJ_coder JMJ_coder is offline
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Join Date: May 2008
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Default Makefiles

Hello,

As I continue in my programming education, my programs are becoming increasingly large and complex. As a result I decided to start to learn how to write makefiles.

I wrote one up for project I'm working on. It had two header files and three .cpp files. When I went to make, I got a boatload of errors, such as methods already defined. I put all the .cpp files into one file, and it works fine. What gives? I can get away with one large .cpp file in this project, but my next one (final project) will be too large for one file.

I do have ifndef, defines for the header files. And each .cpp file called both header files. I don't know if that matters or not.

Here is the Makefile I wrote (didn't work - it did when it was reduced to one .cpp file):

Code:
hack_slash: main.o draw.o collision.o
	g++ main.o draw.o collision.o -o hack_slash -lcurses 

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

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

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

clean:
	rm *.o

Here are the errors I received:

Code:
g++ main.o draw.o collision.o -lcurses
draw.o: In function `thing::thing()':
draw.cpp:(.text+0x0): multiple definition of `thing::thing()'
main.o:main.cpp:(.text+0x0): first defined here
draw.o: In function `thing::thing()':
draw.cpp:(.text+0x6): multiple definition of `thing::thing()'
main.o:main.cpp:(.text+0x6): first defined here
draw.o: In function `thing::thing(int, int, char)':
draw.cpp:(.text+0xc): multiple definition of `thing::thing(int, int, char)'
main.o:main.cpp:(.text+0xc): first defined here
draw.o: In function `thing::thing(int, int, char)':
draw.cpp:(.text+0x34): multiple definition of `thing::thing(int, int, char)'
main.o:main.cpp:(.text+0x34): first defined here
draw.o: In function `thing::getx()':
draw.cpp:(.text+0x5c): multiple definition of `thing::getx()'
main.o:main.cpp:(.text+0x5c): first defined here
draw.o: In function `thing::gety()':
draw.cpp:(.text+0x66): multiple definition of `thing::gety()'
main.o:main.cpp:(.text+0x66): first defined here
draw.o: In function `thing::get_symbol()':
draw.cpp:(.text+0x72): multiple definition of `thing::get_symbol()'
main.o:main.cpp:(.text+0x72): first defined here
draw.o: In function `agent::agent(int, int, char)':
draw.cpp:(.text+0x80): multiple definition of `agent::agent(int, int, char)'
main.o:main.cpp:(.text+0x80): first defined here
draw.o: In function `agent::agent(int, int, char)':
draw.cpp:(.text+0xd8): multiple definition of `agent::agent(int, int, char)'
main.o:main.cpp:(.text+0xd8): first defined here
draw.o: In function `agent::get_velx()':
draw.cpp:(.text+0x130): multiple definition of `agent::get_velx()'
main.o:main.cpp:(.text+0x130): first defined here
draw.o: In function `agent::get_vely()':
draw.cpp:(.text+0x144): multiple definition of `agent::get_vely()'
main.o:main.cpp:(.text+0x144): first defined here
draw.o: In function `agent::set_alive(bool)':
draw.cpp:(.text+0x158): multiple definition of `agent::set_alive(bool)'
main.o:main.cpp:(.text+0x158): first defined here
draw.o: In function `agent::wall_collide()':
draw.cpp:(.text+0x170): multiple definition of `agent::wall_collide()'
main.o:main.cpp:(.text+0x170): first defined here
draw.o: In function `agent::wall_crash()':
draw.cpp:(.text+0x21c): multiple definition of `agent::wall_crash()'
main.o:main.cpp:(.text+0x21c): first defined here
draw.o: In function `agent::get_alive()':
draw.cpp:(.text+0x25e): multiple definition of `agent::get_alive()'
main.o:main.cpp:(.text+0x25e): first defined here
draw.o: In function `agent::get_prevx()':
draw.cpp:(.text+0x26e): multiple definition of `agent::get_prevx()'
main.o:main.cpp:(.text+0x26e): first defined here
draw.o: In function `agent::get_prevy()':
draw.cpp:(.text+0x2c4): multiple definition of `agent::get_prevy()'
main.o:main.cpp:(.text+0x2c4): first defined here
draw.o: In function `dot::dot(int, int, char)':
draw.cpp:(.text+0x31c): multiple definition of `dot::dot(int, int, char)'
main.o:main.cpp:(.text+0x31c): first defined here
draw.o: In function `dot::dot(int, int, char)':
draw.cpp:(.text+0x358): multiple definition of `dot::dot(int, int, char)'
main.o:main.cpp:(.text+0x358): first defined here
draw.o: In function `guard::guard(int, int, char)':
draw.cpp:(.text+0x394): multiple definition of `guard::guard(int, int, char)'
main.o:main.cpp:(.text+0x394): first defined here
draw.o: In function `guard::guard(int, int, char)':
draw.cpp:(.text+0x3ba): multiple definition of `guard::guard(int, int, char)'
main.o:main.cpp:(.text+0x3ba): first defined here
draw.o: In function `hackbot::hackbot(int, int, char)':
draw.cpp:(.text+0x3e0): multiple definition of `hackbot::hackbot(int, int, char)'
main.o:main.cpp:(.text+0x3e0): first defined here
draw.o: In function `hackbot::hackbot(int, int, char)':
draw.cpp:(.text+0x41c): multiple definition of `hackbot::hackbot(int, int, char)'
main.o:main.cpp:(.text+0x41c): first defined here
draw.o: In function `slashbot::slashbot(int, int, char)':
draw.cpp:(.text+0x458): multiple definition of `slashbot::slashbot(int, int, char)'
main.o:main.cpp:(.text+0x458): first defined here
draw.o: In function `slashbot::slashbot(int, int, char)':
draw.cpp:(.text+0x494): multiple definition of `slashbot::slashbot(int, int, char)'
main.o:main.cpp:(.text+0x494): first defined here
draw.o: In function `guard::get_distance(int, int, int, int)':
draw.cpp:(.text+0x526): multiple definition of `guard::get_distance(int, int, int, int)'
main.o:main.cpp:(.text+0x4d0): first defined here
draw.o: In function `guard::normalize_local_steer(float)':
draw.cpp:(.text+0x5a0): multiple definition of `guard::normalize_local_steer(float)'
main.o:main.cpp:(.text+0x54a): first defined here
draw.o: In function `guard::flee(int, int, float)':
draw.cpp:(.text+0x616): multiple definition of `guard::flee(int, int, float)'
main.o:main.cpp:(.text+0x5c0): first defined here
draw.o: In function `guard::seek(int, int, float)':
draw.cpp:(.text+0x68e): multiple definition of `guard::seek(int, int, float)'
main.o:main.cpp:(.text+0x638): first defined here
draw.o: In function `guard::arrive(int, int, float, float, float)':
draw.cpp:(.text+0x70a): multiple definition of `guard::arrive(int, int, float, float, float)'
main.o:main.cpp:(.text+0x6b4): first defined here
draw.o: In function `agent::normalize_vel()':
draw.cpp:(.text+0x838): multiple definition of `agent::normalize_vel()'
main.o:main.cpp:(.text+0x7e2): first defined here
draw.o: In function `agent::normalize_steer()':
draw.cpp:(.text+0x8b2): multiple definition of `agent::normalize_steer()'
main.o:main.cpp:(.text+0x85c): first defined here
draw.o: In function `guard::wall_avoid(int, int, float)':
draw.cpp:(.text+0x92c): multiple definition of `guard::wall_avoid(int, int, float)'
main.o:main.cpp:(.text+0x8d6): first defined here
draw.o: In function `guard::evade(int, int, float, float, float)':
draw.cpp:(.text+0xa24): multiple definition of `guard::evade(int, int, float, float, float)'
main.o:main.cpp:(.text+0x9ce): first defined here
draw.o: In function `guard::pursue(int, int, float, float, float)':
draw.cpp:(.text+0xb06): multiple definition of `guard::pursue(int, int, float, float, float)'
main.o:main.cpp:(.text+0xab0): first defined here
draw.o: In function `agent::update()':
draw.cpp:(.text+0xbe8): multiple definition of `agent::update()'
main.o:main.cpp:(.text+0xb92): first defined here
draw.o: In function `slashbot::move(dot, hackbot, thing*)':
draw.cpp:(.text+0xcb6): multiple definition of `slashbot::move(dot, hackbot, thing*)'
main.o:main.cpp:(.text+0xc60): first defined here
draw.o: In function `hackbot::move(dot, slashbot, thing*)':
draw.cpp:(.text+0xd8a): multiple definition of `hackbot::move(dot, slashbot, thing*)'
main.o:main.cpp:(.text+0xd34): first defined here
draw.o: In function `dot::player_steer(int)':
draw.cpp:(.text+0xe30): multiple definition of `dot::player_steer(int)'
main.o:main.cpp:(.text+0xdda): first defined here
collision.o: In function `thing::thing()':
collision.cpp:(.text+0x0): multiple definition of `thing::thing()'
main.o:main.cpp:(.text+0x0): first defined here
collision.o: In function `thing::thing()':
collision.cpp:(.text+0x6): multiple definition of `thing::thing()'
main.o:main.cpp:(.text+0x6): first defined here
collision.o: In function `thing::thing(int, int, char)':
collision.cpp:(.text+0xc): multiple definition of `thing::thing(int, int, char)'
main.o:main.cpp:(.text+0xc): first defined here
collision.o: In function `thing::thing(int, int, char)':
collision.cpp:(.text+0x34): multiple definition of `thing::thing(int, int, char)'
main.o:main.cpp:(.text+0x34): first defined here
collision.o: In function `thing::getx()':
collision.cpp:(.text+0x5c): multiple definition of `thing::getx()'
main.o:main.cpp:(.text+0x5c): first defined here
collision.o: In function `thing::gety()':
collision.cpp:(.text+0x66): multiple definition of `thing::gety()'
main.o:main.cpp:(.text+0x66): first defined here
collision.o: In function `thing::get_symbol()':
collision.cpp:(.text+0x72): multiple definition of `thing::get_symbol()'
main.o:main.cpp:(.text+0x72): first defined here
collision.o: In function `agent::agent(int, int, char)':
collision.cpp:(.text+0x80): multiple definition of `agent::agent(int, int, char)'
main.o:main.cpp:(.text+0x80): first defined here
collision.o: In function `agent::agent(int, int, char)':
collision.cpp:(.text+0xd8): multiple definition of `agent::agent(int, int, char)'
main.o:main.cpp:(.text+0xd8): first defined here
collision.o: In function `agent::get_velx()':
collision.cpp:(.text+0x130): multiple definition of `agent::get_velx()'
main.o:main.cpp:(.text+0x130): first defined here
collision.o: In function `agent::get_vely()':
collision.cpp:(.text+0x144): multiple definition of `agent::get_vely()'
main.o:main.cpp:(.text+0x144): first defined here
collision.o: In function `agent::set_alive(bool)':
collision.cpp:(.text+0x158): multiple definition of `agent::set_alive(bool)'
main.o:main.cpp:(.text+0x158): first defined here
collision.o: In function `agent::wall_collide()':
collision.cpp:(.text+0x170): multiple definition of `agent::wall_collide()'
main.o:main.cpp:(.text+0x170): first defined here
collision.o: In function `agent::wall_crash()':
collision.cpp:(.text+0x21c): multiple definition of `agent::wall_crash()'
main.o:main.cpp:(.text+0x21c): first defined here
collision.o: In function `agent::get_alive()':
collision.cpp:(.text+0x25e): multiple definition of `agent::get_alive()'
main.o:main.cpp:(.text+0x25e): first defined here
collision.o: In function `agent::get_prevx()':
collision.cpp:(.text+0x26e): multiple definition of `agent::get_prevx()'
main.o:main.cpp:(.text+0x26e): first defined here
collision.o: In function `agent::get_prevy()':
collision.cpp:(.text+0x2c4): multiple definition of `agent::get_prevy()'
main.o:main.cpp:(.text+0x2c4): first defined here
collision.o: In function `dot::dot(int, int, char)':
collision.cpp:(.text+0x31c): multiple definition of `dot::dot(int, int, char)'
main.o:main.cpp:(.text+0x31c): first defined here
collision.o: In function `dot::dot(int, int, char)':
collision.cpp:(.text+0x358): multiple definition of `dot::dot(int, int, char)'
main.o:main.cpp:(.text+0x358): first defined here
collision.o: In function `guard::guard(int, int, char)':
collision.cpp:(.text+0x394): multiple definition of `guard::guard(int, int, char)'
main.o:main.cpp:(.text+0x394): first defined here
collision.o: In function `guard::guard(int, int, char)':
collision.cpp:(.text+0x3ba): multiple definition of `guard::guard(int, int, char)'
main.o:main.cpp:(.text+0x3ba): first defined here
collision.o: In function `hackbot::hackbot(int, int, char)':
collision.cpp:(.text+0x3e0): multiple definition of `hackbot::hackbot(int, int, char)'
main.o:main.cpp:(.text+0x3e0): first defined here
collision.o: In function `hackbot::hackbot(int, int, char)':
collision.cpp:(.text+0x41c): multiple definition of `hackbot::hackbot(int, int, char)'
main.o:main.cpp:(.text+0x41c): first defined here
collision.o: In function `slashbot::slashbot(int, int, char)':
collision.cpp:(.text+0x458): multiple definition of `slashbot::slashbot(int, int, char)'
main.o:main.cpp:(.text+0x458): first defined here
collision.o: In function `slashbot::slashbot(int, int, char)':
collision.cpp:(.text+0x494): multiple definition of `slashbot::slashbot(int, int, char)'
main.o:main.cpp:(.text+0x494): first defined here
collision.o: In function `guard::get_distance(int, int, int, int)':
collision.cpp:(.text+0x6b0): multiple definition of `guard::get_distance(int, int, int, int)'
main.o:main.cpp:(.text+0x4d0): first defined here
collision.o: In function `guard::normalize_local_steer(float)':
collision.cpp:(.text+0x72a): multiple definition of `guard::normalize_local_steer(float)'
main.o:main.cpp:(.text+0x54a): first defined here
collision.o: In function `guard::flee(int, int, float)':
collision.cpp:(.text+0x7a0): multiple definition of `guard::flee(int, int, float)'
main.o:main.cpp:(.text+0x5c0): first defined here
collision.o: In function `guard::seek(int, int, float)':
collision.cpp:(.text+0x818): multiple definition of `guard::seek(int, int, float)'
main.o:main.cpp:(.text+0x638): first defined here
collision.o: In function `guard::arrive(int, int, float, float, float)':
collision.cpp:(.text+0x894): multiple definition of `guard::arrive(int, int, float, float, float)'
main.o:main.cpp:(.text+0x6b4): first defined here
collision.o: In function `agent::normalize_vel()':
collision.cpp:(.text+0x9c2): multiple definition of `agent::normalize_vel()'
main.o:main.cpp:(.text+0x7e2): first defined here
collision.o: In function `agent::normalize_steer()':
collision.cpp:(.text+0xa3c): multiple definition of `agent::normalize_steer()'
main.o:main.cpp:(.text+0x85c): first defined here
collision.o: In function `guard::wall_avoid(int, int, float)':
collision.cpp:(.text+0xab6): multiple definition of `guard::wall_avoid(int, int, float)'
main.o:main.cpp:(.text+0x8d6): first defined here
collision.o: In function `guard::evade(int, int, float, float, float)':
collision.cpp:(.text+0xbae): multiple definition of `guard::evade(int, int, float, float, float)'
main.o:main.cpp:(.text+0x9ce): first defined here
collision.o: In function `guard::pursue(int, int, float, float, float)':
collision.cpp:(.text+0xc90): multiple definition of `guard::pursue(int, int, float, float, float)'
main.o:main.cpp:(.text+0xab0): first defined here
collision.o: In function `agent::update()':
collision.cpp:(.text+0xd72): multiple definition of `agent::update()'
main.o:main.cpp:(.text+0xb92): first defined here
collision.o: In function `slashbot::move(dot, hackbot, thing*)':
collision.cpp:(.text+0xe40): multiple definition of `slashbot::move(dot, hackbot, thing*)'
main.o:main.cpp:(.text+0xc60): first defined here
collision.o: In function `hackbot::move(dot, slashbot, thing*)':
collision.cpp:(.text+0xf14): multiple definition of `hackbot::move(dot, slashbot, thing*)'
main.o:main.cpp:(.text+0xd34): first defined here
collision.o: In function `dot::player_steer(int)':
collision.cpp:(.text+0xfba): multiple definition of `dot::player_steer(int)'
main.o:main.cpp:(.text+0xdda): first defined here
collect2: ld returned 1 exit status
make: *** [hack_slash] Error 1
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Last edited by JMJ_coder; 18th October 2008 at 03:25 PM.
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