Generate build dependencies automatically

demod/mod/Makefile

@@ -1,8 +1,9 @@
 LDLIBS = -lm
 
 PROGRAMS := rs41mod dfm09mod rs92mod lms6mod lms6Xmod meisei100mod m10mod m20mod imet54mod mp3h1mod
+SRC=$(PROGRAMS:=.c) bch_ecc_mod.c demod_mod.c
 
-all: $(PROGRAMS)
+all: depend $(PROGRAMS)
 
 rs41mod: rs41mod.o demod_mod.o bch_ecc_mod.o
 
@@ -24,10 +25,16 @@ imet54mod: imet54mod.o demod_mod.o
 
 mp3h1mod: mp3h1mod.o demod_mod.o
 
-bch_ecc_mod.o: bch_ecc_mod.h
-
 demod_mod.o: CFLAGS += -Ofast
-demod_mod.o: demod_mod.h
+
+depend: .depend
+
+.depend: $(SRC)
+	$(CC) $(CFLAGS) -MM $^ > .depend
+
+-include .depend
 
 clean:
-	$(RM) $(PROGRAMS) $(PROGRAMS:=.o) demod_mod.o bch_ecc_mod.o
+	$(RM) $(PROGRAMS) $(SRC:=.o)
+
+.PHONY: all clean depend