# add a cleaning target (to get rid of the binaries)

# define default target (first target = default)
# it depends on 'hello.o' (which must exist)
# and hello_func.o
hello: hello.o hello_func.o
	gcc -Wall hello.o hello_func.o -o hello

# define hello.o target
# it depends on hello.c (and is created from)
# also depends on hello_api.h which would mean that
# changing the hello.h api would force make to rebuild
# this target (hello.o).
# gcc -c: compile only, do not link
hello.o: hello.c hello_api.h
	gcc -Wall -c hello.c -o hello.o

# define hello_func.o target
# it depends on hello_func.c (and is created from)
# and hello_api.h (since that's it's declaration)
hello_func.o: hello_func.c hello_api.h
	gcc -Wall -c hello_func.c -o hello_func.o

# This is the definition of the target 'clean'
# Here we'll remove all the built binaries and
# all the object files that we might have generated
# Notice the -f flag for rm, it means "force" which
# in turn means that rm will try to remove the given
# files, and if there are none, then that's ok. Also
# it means that we have no writing permission to that
# file and have writing permission to the directory
# holding the file, rm will not then ask for permission
# interactivelly.
clean:
	rm -f hello hello.o hello_func.o