How to optimize this makefile? - makefile

Question

I'm trying to optimize this makefile for adding PGM.
I created makefile needs to be optimized:
SOURCES = main.cpp logic.cpp
OBJECTS = $(SOURCES:.cpp=.o)
CC = CC
MODEL001 = FLAGA FLAGB
MODEL002 = FLAGC
CFLAGS001 = -c $(MODEL001:%=-D%)
CFLAGS002 = -c $(MODEL002:%=-D%)
PGMNUM = 001 002
all: PGM001 PGM002
PGM001:$(SOURCES)
$(CC) $(CFLAGS001) $(SOURCES)
$(CC) -o $PGM001 $(OBJECTS)
PGM002:$(SOURCES)
$(CC) $(CFLAGS002) $(SOURCES)
$(CC) -o $PGM002 $(OBJECTS)
Currently, I change the following variables when adding a PGM003.
ADD : MODEL003, CFLAGS003, PGM003:$(SOURCES)...
MODIFY : PGMNUM, all
Just by adding MODEL003 and PGMNUM, this makefile seems to work. How can I do it?
(pseudo code like this but does not work):
SOURCES = main.cpp logic.cpp
OBJECTS = $(SOURCES:.cpp=.o)
CC = CC
MODEL001 = FLAGA FLAGB
MODEL002 = FLAGC
MODEL003 = FLAGD FLAGE
PGMNUM = 001 002 003
CFLAGS$(PGMNUM) = -c $(MODEL$(PGMNUM):%=-D%)
all: $(PGMNUM:%=PGM%)
PGM$(PGMNUM):$(SOURCES)
$(CC) $(CFLAGS$(PGMNUM)) $(SOURCES)
$(CC) -o $PGM$(PGMNUM) $(OBJECTS)

Answer 1

By 'optimize', I take it you want to make it use less lines of code, rather than make it run faster. If so, you can use a function and eval as so:
SOURCES := main.cpp logic.cpp
PGMNUMS := 001 002 003
CC := CC
MODEL001 := FLAGA FLAGB
MODEL002 := FLAGC
MODEL003 := FLAGD
define func
CFLAGS$1 := -c $(MODEL$(p):%=-D%)
OBJECTS$1 := $$(SOURCES:.cpp=.$1.o)
$$(OBJECTS$1) : %.$1.o : %.cpp
$(CC) $$(CFLAGS$1) -o $$# $$^
PGM$1 : $$(OBJECTS$1)
$(CC) -o $$# $$^
endef
$(info --vv-- show generated code --vv--)
$(foreach p,$(PGMNUMS),$(info $(call func,$p)))
$(info --^^-- end of generated code --^^--)
#actually generate the calls:
$(foreach p,$(PGMNUMS),$(eval $(call func,$p)))
all: $(PGMNUM:%=PGM%)
Basically, you define a function func, and then run it for all values of $(PGMNUMS). Notice the use of $$ in the function definition -- in the function, $1 will expand to the first parameter. Items with $$var in front of them will expand to $var, rather than expanding at the time. I added a $(info..) which is useful to debug what you generate.