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todd@ reminds me:

If you 'vi file.c' and change stuff, then 'make depend && make' you'll
have a file.o file most definately more recent than the latest committed
version of file.c.

Then, if you rm file.c, and cvs update file.c, if 'file.c' is set to the
timestamp of the last committed version, a subsequent 'make' will not
rebuild the .o file.

to fix this we simply use the current timestamp when updating files.
thanks todd@!

/*	$OpenBSD: rcs.h,v 1.41 2005/12/03 15:31:53 joris Exp $	*/
/*
 * Copyright (c) 2004 Jean-Francois Brousseau <jfb@openbsd.org>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
 * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL  DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef RCS_H
#define RCS_H

#include <sys/types.h>
#include <sys/queue.h>

#include <time.h>

#include "buf.h"

#define RCS_DIFF_MAXARG		32
#define RCS_DIFF_DIV \
	"==================================================================="

#define RCSDIR			"RCS"
#define RCS_FILE_EXT		",v"

#define RCS_HEAD_BRANCH		"HEAD"
#define RCS_HEAD_INIT		"1.1"
#define RCS_HEAD_REV		((RCSNUM *)(-1))


#define RCS_SYM_INVALCHAR	"$,.:;@"


#define RCS_MAGIC_BRANCH	".0."
#define RCS_STATE_EXP		"Exp"
#define RCS_STATE_DEAD		"dead"

/* lock types */
#define RCS_LOCK_INVAL		(-1)
#define RCS_LOCK_LOOSE		0
#define RCS_LOCK_STRICT		1


/* RCS keyword expansion modes (kflags) */
#define RCS_KWEXP_NONE	0x00
#define RCS_KWEXP_NAME	0x01	/* include keyword name */
#define RCS_KWEXP_VAL	0x02	/* include keyword value */
#define RCS_KWEXP_LKR	0x04	/* include name of locker */
#define RCS_KWEXP_OLD	0x08	/* generate old keyword string */
#define RCS_KWEXP_ERR	0x10	/* mode has an error */

#define RCS_KWEXP_DEFAULT	(RCS_KWEXP_NAME | RCS_KWEXP_VAL)
#define RCS_KWEXP_KVL		(RCS_KWEXP_NAME | RCS_KWEXP_VAL | RCS_KWEXP_LKR)

#define RCS_KWEXP_INVAL(k) \
	((k & RCS_KWEXP_ERR) || \
	((k & RCS_KWEXP_OLD) && (RCS_KWEXP_OLD & ~RCS_KWEXP_OLD)))



#define RCSNUM_MAXNUM	USHRT_MAX
#define RCSNUM_MAXLEN	64

#define RCSNUM_ISBRANCH(n)	((n)->rn_len % 2)


/* file flags */
#define RCS_READ	0x01
#define RCS_WRITE	0x02
#define RCS_RDWR	(RCS_READ|RCS_WRITE)
#define RCS_CREATE	0x04		/* create the file */

/* internal flags */
#define RCS_PARSED	0x010000	/* file has been parsed */
#define RCS_SYNCED	0x020000	/* in-mem copy is sync with disk copy */
#define RCS_SLOCK	0x040000	/* strict lock */

/* delta flags */
#define RCS_RD_DEAD	0x01	/* dead */

/* RCS error codes */
#define RCS_ERR_NOERR	0
#define RCS_ERR_NOENT	1
#define RCS_ERR_DUPENT	2
#define RCS_ERR_BADNUM	3
#define RCS_ERR_BADSYM	4
#define RCS_ERR_PARSE	5
#define RCS_ERR_ERRNO	255

/* used for cvs_checkout_rev */
#define CHECKOUT_REV_CREATED	1
#define CHECKOUT_REV_MERGED	2
#define CHECKOUT_REV_REMOVED	3
#define CHECKOUT_REV_UPDATED	4

typedef struct rcs_num {
	u_int		 rn_len;
	u_int16_t	*rn_id;
} RCSNUM;


struct rcs_access {
	char			*ra_name;
	uid_t			 ra_uid;
	TAILQ_ENTRY(rcs_access)	 ra_list;
};

struct rcs_sym {
	char			*rs_name;
	RCSNUM			*rs_num;
	TAILQ_ENTRY(rcs_sym)	 rs_list;
};

struct rcs_lock {
	char	*rl_name;
	RCSNUM	*rl_num;

	TAILQ_ENTRY(rcs_lock)	rl_list;
};


struct rcs_branch {
	RCSNUM			*rb_num;
	TAILQ_ENTRY(rcs_branch)	rb_list;
};

struct rcs_dlist {
	struct rcs_delta	*tqh_first;
	struct rcs_delta	**tqh_last;
};

struct rcs_delta {
	RCSNUM		*rd_num;
	RCSNUM		*rd_next;
	u_int		 rd_flags;
	struct tm	 rd_date;
	char		*rd_author;
	char		*rd_state;
	char		*rd_log;
	u_char		*rd_text;
	size_t		 rd_tlen;

	struct rcs_dlist		rd_snodes;
	TAILQ_HEAD(, rcs_branch)	rd_branches;
	TAILQ_ENTRY(rcs_delta)		rd_list;
};


typedef struct rcs_file {
	char	*rf_path;
	u_int	 rf_ref;
	mode_t	 rf_mode;
	u_int	 rf_flags;

	RCSNUM	*rf_head;
	RCSNUM	*rf_branch;
	char	*rf_comment;
	char	*rf_expand;
	char	*rf_desc;

	u_int					rf_ndelta;
	struct rcs_dlist			rf_delta;
	TAILQ_HEAD(rcs_alist, rcs_access)	rf_access;
	TAILQ_HEAD(rcs_slist, rcs_sym)		rf_symbols;
	TAILQ_HEAD(rcs_llist, rcs_lock)		rf_locks;

	void	*rf_pdata;
} RCSFILE;


extern int rcs_errno;


RCSFILE			*rcs_open(const char *, int, ...);
void			 rcs_close(RCSFILE *);
const RCSNUM		*rcs_head_get(RCSFILE *);
int			 rcs_head_set(RCSFILE *, const RCSNUM *);
const RCSNUM		*rcs_branch_get(RCSFILE *);
int			 rcs_branch_set(RCSFILE *, const RCSNUM *);
int			 rcs_access_add(RCSFILE *, const char *);
int			 rcs_access_remove(RCSFILE *, const char *);
int			 rcs_access_check(RCSFILE *, const char *);
struct rcs_delta	*rcs_findrev(RCSFILE *, const RCSNUM *);
int			 rcs_sym_add(RCSFILE *, const char *, RCSNUM *);
int			 rcs_sym_remove(RCSFILE *, const char *);
RCSNUM			*rcs_sym_getrev(RCSFILE *, const char *);
int			 rcs_sym_check(const char *);
int			 rcs_lock_getmode(RCSFILE *);
int			 rcs_lock_setmode(RCSFILE *, int);
int			 rcs_lock_add(RCSFILE *, const char *, RCSNUM *);
int			 rcs_lock_remove(RCSFILE *, const RCSNUM *);
BUF			*rcs_getrev(RCSFILE *, RCSNUM *);
int			 rcs_deltatext_set(RCSFILE *, RCSNUM *, const char *);
const char		*rcs_desc_get(RCSFILE *);
int			 rcs_desc_set(RCSFILE *, const char *);
const char		*rcs_comment_lookup(const char *);
const char		*rcs_comment_get(RCSFILE *);
int			 rcs_comment_set(RCSFILE *, const char *);
int			 rcs_kwexp_set(RCSFILE *, int);
int			 rcs_kwexp_get(RCSFILE *);
int			 rcs_rev_add(RCSFILE *, RCSNUM *, const char *, time_t,
			     const char *);
time_t			 rcs_rev_getdate(RCSFILE *, RCSNUM *);
int			 rcs_rev_setlog(RCSFILE *, RCSNUM *, const char *);
int			 rcs_rev_remove(RCSFILE *, RCSNUM *);
int			 rcs_state_set(RCSFILE *, RCSNUM *, const char *);
const char		*rcs_state_get(RCSFILE *, RCSNUM *);
int			 rcs_state_check(const char *);
RCSNUM			*rcs_tag_resolve(RCSFILE *, const char *);
const char		*rcs_errstr(int);


int	rcs_kflag_get(const char *);
void	rcs_kflag_usage(void);
int	rcs_kw_expand(RCSFILE *, u_char *, size_t, size_t *);

RCSNUM	*rcsnum_alloc(void);
RCSNUM	*rcsnum_parse(const char *);
RCSNUM	*rcsnum_brtorev(const RCSNUM *);
RCSNUM	*rcsnum_revtobr(const RCSNUM *);
RCSNUM	*rcsnum_inc(RCSNUM *);
RCSNUM	*rcsnum_dec(RCSNUM *);
void	 rcsnum_free(RCSNUM *);
int	 rcsnum_aton(const char *, char **, RCSNUM *);
char	*rcsnum_tostr(const RCSNUM *, char *, size_t);
int	 rcsnum_cpy(const RCSNUM *, RCSNUM *, u_int);
int	 rcsnum_cmp(const RCSNUM *, const RCSNUM *, u_int);

#endif	/* RCS_H */