Make file: compiling all .cpp files to .o files

Question

I'm trying to create a make file which will compile all the .cpp files in the test directory to .o files in the obj directory. Below is an abridged version of what I am doing. The problem is that the calls made to compile to the .o files have the proper .o name, but they all are compiling the same .cpp file.

gcc -c -o obj/foo.o test/foo.c
gcc -c -o obj/bar.o test/foo.c
gcc -c -o obj/baz.o test/foo.c

What do I need to change to make it compile the corresponding .cpp file?

CPP_FILES := $(wildcard test/*.cpp)
OBJ_FILES = $(patsubst test/%.cpp,obj/%.o,$(CPP_FILES))


obj/%.o: $(CPP_FILES)
    $(CXX) $(CPPFLAGS) $(CXXFLAGS) -c -o $@ $<

executable : $(OBJ_FILES) foo.a
    $(CXX) $(CPPFLAGS) $(CXXFLAGS) -lpthread $^ -o $@

Thanks.

Answer 1

You need to match % for your template rule. at the moment you are saying that every .o depends on every cpp file. And $< is the first of them.

Replace it with:

obj/%.o : test/%.cpp