Programming

# Compiler flags, i.e. optimization and include paths
CFLAGS=-O2 -pipe
# C++ compiler flags, including CFLAGS
CXXFLAGS=$(CFLAGS)
# Linker flags, i.e. libraries and lib paths
LDFLAGS=-lm
# All object files
OBJECTS=a.o b.o c.o d.o
# All output target files
TARGETS=ab cd

# The first target should cause all targets to be built
all:$(TARGETS)

# Link ab from a.o and b.o
ab:a.o b.o
        $(CXX) a.o b.o $(LDFLAGS) -o $@

# Link cd from c.o and d.o
cd:c.o d.o
        $(CXX) c.o d.o $(LDFLAGS) -o $@

# Delete all targets and objects
clean:
        rm -f $(TARGETS) $(OBJS)