Add Header support in Makefile

Author: mattludwigs

Makefile

@@ -57,6 +57,7 @@ ERL_CFLAGS ?= -I$(ERL_EI_INCLUDE_DIR)
 ERL_LDFLAGS ?= -L$(ERL_EI_LIBDIR) -lei
 
 SRC = src/cdev_nif.c
+HEADERS =$(wildcard src/*.h)
 OBJ = $(SRC:src/%.c=$(BUILD)/%.o)
 
 calling_from_make:
@@ -66,7 +67,7 @@ all: install
 
 install: $(PREFIX) $(BUILD) $(NIF)
 
-$(OBJ): Makefile
+$(OBJ): $(HEADERS) Makefile
 
 $(BUILD)/%.o: src/%.c
 	$(CC) -c $(ERL_CFLAGS) $(CFLAGS) -o $@ $<

src/cdev_nif.c

@@ -482,7 +482,6 @@ static ErlNifFunc nif_funcs[] = {
     {"request_linehandle_multi", 5, request_linehandle_multi_nif},
     {"request_lineevent", 5, request_lineevent_nif},
     {"read_interrupt", 3, read_interrupt_nif},
-    {"set_values", 2, set_values_nif}
-};
+    {"set_values", 2, set_values_nif}};
 
 ERL_NIF_INIT(Elixir.Circuits.GPIO.Chip.Nif, nif_funcs, load, NULL, NULL, NULL)