unix - No rule to make target in Maefile -

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i'm learning write makefiles. made own simple 1 try , test, every time run make, get: 

make: *** no rule make target `/%.cpp', needed `obj'.  stop.

i googled. i'm pretty sure typed correctly, , folders set way should be. here makefile:

cc = g++ ld = g++  name = app obj_dir = obj  src_dir = src   cc_flags = -std=c++0x  all: $(name)  $(name): $(obj_dir)/%.o     $(ld) $(obj_dir)/%.o -o $@  $(obj_dir)/%.o: $(src_dir)/%.cpp     $(cc) $< -o $@ $(cc_flags)  clean:     rm $(name) $(obj_dir) -rf

what problem?

the line:

$(name): $(obj_dir)/%.o

is not correct. not pattern rule (because target doesn't contain pattern character, %) , it's interpreted explicit rule, saying app depends on actual file named obj/%.o doesn't exist, , make doesn't know how build (because there's no file src/%.cpp).

you need change to:

$(name): $(obj_dir)/foo.o ...

or whatever object files have.


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