Makefile will not expand dependencies - c++

Question

Using the following as an example makefile:
CC=g++
CFLAGS=-c -Wall
LDFLAGS=-lfoobar
SOURCES=main.cpp foo.cpp bar.cpp
OBJECTS=$(SOURCES:.cpp=.o)
EXECUTABLE=hello
all: $(OBJECTS)
$(CC) $(LDFLAGS) $(OBJECTS) -o $#
$(OBJECTS):
$(CC) $(CFLAGS) $< -o $#
$< always expands to nothing.
I've tried changing it to the following:
CC=g++
CFLAGS=-c -Wall
LDFLAGS=
SOURCES=main.cpp foo.cpp bar.cpp
OBJECTS=$(SOURCES:.cpp=.o)
EXECUTABLE=hello
all: $(OBJECTS) # or main.o foo.o bar.cpp
$(CC) $(LDFLAGS) $(OBJECTS) -o $#
.cpp.o:
$(CC) $(CFLAGS) $< -o $#
This tells me that there's no rule for main.o
Am I missing something here? I see a lot of make files using these syntaxes and/or variables and dependencies.

Answer 1

Try this:
CXX=g++
CXXFLAGS=-c -Wall
LDFLAGS=
SOURCES=main.cpp foo.cpp bar.cpp
OBJECTS=$(SOURCES:.cpp=.o)
EXECUTABLE=hello
all: $(EXECUTABLE)
$(EXECUTABLE): $(OBJECTS) # or main.o foo.o bar.cpp
$(CXX) -o $# $(LDFLAGS) $(OBJECTS) $(LIBS)
The rule to build each object file is built-in anyway, so there is no need to define it.