GNU make doesn't pick up changes

Shell Programming and Scripting
1

It's been a while since I had to write a Makefile, but I've managed to clobber this together:

SRC=module1.c module2.c
OBJS=$(SRC:%.c=%.o)
HDR=include1.h include2.h

CC=gcc
CFLAGS=-Wall -ggdb -D_XOPEN_SOURCE -I. -ansi

all: program

program: $(OBJS)
        $(CC) $(CFLAGS) -o $@ $(OBJS)

.o: $(@:%.o=%.c) $(HDR)
        $(CC) $(CFLAGS) -c $<

clean:
        rm -f program $(OBJS)

It works for the most part, except when a change in one of the includes happens, result in make telling me "nothing to do".

$ make
gcc -Wall -ggdb -D_XOPEN_SOURCE -I. -ansi   -c -o module1.o module1.c
gcc -Wall -ggdb -D_XOPEN_SOURCE -I. -ansi   -c -o module2.o module2.c
gcc -Wall -ggdb -D_XOPEN_SOURCE -I. -ansi -o program module1.o module2.o
$ touch include1.h
$ touch include2.h
$ make
make: Nothing to be done for `all'.
$ touch module1.c
$ make
gcc -Wall -ggdb -D_XOPEN_SOURCE -I. -ansi   -c -o module1.o module1.c
gcc -Wall -ggdb -D_XOPEN_SOURCE -I. -ansi -o program module1.o module2.o
$

Both include?.h files are used in both module?.c files. I probably screwed up the prerequisite part of the target definition, but for the love of the FSM, I can't find it.

All files reside on a ext3 LV, without any special time-keeping options altered.

Any help would be greatly appreciated.

2

I think it's that the target doesn't depend on the headers. So adding them:

program: $(OBJS) $(HDR)
3

Tried that. It rebuilds the program target, but the intermediary objects are still unchanged.

4

you are built executable previously and objects and ex file are ready in current dir.maybe therefore make does not anything.
if you try `make clean` and then try again make will be process.

secondly touch command just change to modify/access times if the file is there and make command process only `module1.c` because of make detects that `module1.c` s timestamps are newer and rebuild executable with this object file.

regards
ygemici