Makefile help

[Ascendancy]

Ok, so my assignment needs to be compiled on Linux, and I know very little about Makefiles.

My current makefile looks like this

LIBS = -lX11   -lglut -lGLU -lm 
INCDIRS = -I/usr/include -I/usr/X11R6/include/ -I.
LIBDIRS =  -L/usr/X11R6/lib -L/usr/local/lib -L/usr/lib 
CC = gcc
CCC = gcc
clean:
	rm *.o



Cannon.o:Cannon.cpp
	$(CC) $(INCDIRS) -g -c $*.cpp -o $*.o

Cannon:Cannon.o 
	$(CC) $(CFLAGS) -o $@ $<   $(LIBDIRS) $(LIBS)

I need to link in a BMP loader, called BmpImage.cpp

I've included the .h file in the Cannon.cpp class, but I've no idea how to modify my makefile to link the library in.

Any help would be greatly appriciated.

 

[matja]

Think i'd try this :

LIBS = -lX11   -lglut -lGLU -lm 
INCDIRS = -I/usr/include -I/usr/X11R6/include/ -I.
LIBDIRS =  -L/usr/X11R6/lib -L/usr/local/lib -L/usr/lib 
CC = gcc
CCC = gcc
clean:
	rm *.o

[COLOR="Red"]Bmpimage.o:Bmpimage.cpp
	$(CC) $(INCDIRS) -g -c $*.cpp -o $*.o[/COLOR]

Cannon.o:Cannon.cpp
	$(CC) $(INCDIRS) -g -c $*.cpp -o $*.o

Cannon:Cannon.o [COLOR="Red"]Bmpimage.o[/COLOR]
	$(CC) $(CFLAGS) -o $@ [COLOR="Red"]$^[/COLOR]  $(LIBDIRS) $(LIBS)

That's saying that to make 'Cannon' (executable) it needs both Cannon.o and Bmpimage.o, and another rule on how to make Bmpimage.o from Bmpimage.cpp, the same as Cannon.o.

Changing the $< to $^ means use the names of all prerequisites (Cannon.o and Bmpimage.o) instead of just the first (Cannon.o)

You could also replace both .o rules with one suffix rule :

.cpp.o :
	$(CC) $(INCDIRS) -g -c $< -o $@

Which basically means "when I need a .o from a .cpp, do this ..."