[GitHub/mt8127/android_kernel_alcatel_ttab.git] / scripts / basic / fixdep.c

/*
 * "Optimize" a list of dependencies as spit out by gcc -MD
 * for the kernel build
 * ===========================================================================
 *
 * Author       Kai Germaschewski
 * Copyright    2002 by Kai Germaschewski  <kai.germaschewski@gmx.de>
 *
 * This software may be used and distributed according to the terms
 * of the GNU General Public License, incorporated herein by reference.
 *
 *
 * Introduction:
 *
 * gcc produces a very nice and correct list of dependencies which
 * tells make when to remake a file.
 *
 * To use this list as-is however has the drawback that virtually
 * every file in the kernel includes autoconf.h.
 *
 * If the user re-runs make *config, autoconf.h will be
 * regenerated.  make notices that and will rebuild every file which
 * includes autoconf.h, i.e. basically all files. This is extremely
 * annoying if the user just changed CONFIG_HIS_DRIVER from n to m.
 *
 * So we play the same trick that "mkdep" played before. We replace
 * the dependency on autoconf.h by a dependency on every config
 * option which is mentioned in any of the listed prequisites.
 *
 * kconfig populates a tree in include/config/ with an empty file
 * for each config symbol and when the configuration is updated
 * the files representing changed config options are touched
 * which then let make pick up the changes and the files that use
 * the config symbols are rebuilt.
 *
 * So if the user changes his CONFIG_HIS_DRIVER option, only the objects
 * which depend on "include/linux/config/his/driver.h" will be rebuilt,
 * so most likely only his driver ;-)
 *
 * The idea above dates, by the way, back to Michael E Chastain, AFAIK.
 *
 * So to get dependencies right, there are two issues:
 * o if any of the files the compiler read changed, we need to rebuild
 * o if the command line given to the compile the file changed, we
 *   better rebuild as well.
 *
 * The former is handled by using the -MD output, the later by saving
 * the command line used to compile the old object and comparing it
 * to the one we would now use.
 *
 * Again, also this idea is pretty old and has been discussed on
 * kbuild-devel a long time ago. I don't have a sensibly working
 * internet connection right now, so I rather don't mention names
 * without double checking.
 *
 * This code here has been based partially based on mkdep.c, which
 * says the following about its history:
 *
 *   Copyright abandoned, Michael Chastain, <mailto:mec@shout.net>.
 *   This is a C version of syncdep.pl by Werner Almesberger.
 *
 *
 * It is invoked as
 *
 *   fixdep <depfile> <target> <cmdline>
 *
 * and will read the dependency file <depfile>
 *
 * The transformed dependency snipped is written to stdout.
 *
 * It first generates a line
 *
 *   cmd_<target> = <cmdline>
 *
 * and then basically copies the .<target>.d file to stdout, in the
 * process filtering out the dependency on autoconf.h and adding
 * dependencies on include/config/my/option.h for every
 * CONFIG_MY_OPTION encountered in any of the prequisites.
 *
 * It will also filter out all the dependencies on *.ver. We need
 * to make sure that the generated version checksum are globally up
 * to date before even starting the recursive build, so it's too late
 * at this point anyway.
 *
 * The algorithm to grep for "CONFIG_..." is bit unusual, but should
 * be fast ;-) We don't even try to really parse the header files, but
 * merely grep, i.e. if CONFIG_FOO is mentioned in a comment, it will
 * be picked up as well. It's not a problem with respect to
 * correctness, since that can only give too many dependencies, thus
 * we cannot miss a rebuild. Since people tend to not mention totally
 * unrelated CONFIG_ options all over the place, it's not an
 * efficiency problem either.
 *
 * (Note: it'd be easy to port over the complete mkdep state machine,
 *  but I don't think the added complexity is worth it)
 */
/*
 * Note 2: if somebody writes HELLO_CONFIG_BOOM in a file, it will depend onto
 * CONFIG_BOOM. This could seem a bug (not too hard to fix), but please do not
 * fix it! Some UserModeLinux files (look at arch/um/) call CONFIG_BOOM as
 * UML_CONFIG_BOOM, to avoid conflicts with /usr/include/linux/autoconf.h,
 * through arch/um/include/uml-config.h; this fixdep "bug" makes sure that
 * those files will have correct dependencies.
 */

#include <sys/types.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <limits.h>
#include <ctype.h>
#include <arpa/inet.h>

#define INT_CONF ntohl(0x434f4e46)
#define INT_ONFI ntohl(0x4f4e4649)
#define INT_NFIG ntohl(0x4e464947)
#define INT_FIG_ ntohl(0x4649475f)

char *target;
char *depfile;
char *cmdline;

static void usage(void)
{
	fprintf(stderr, "Usage: fixdep <depfile> <target> <cmdline>\n");
	exit(1);
}

/*
 * Print out the commandline prefixed with cmd_<target filename> :=
 */
static void print_cmdline(void)
{
	printf("cmd_%s := %s\n\n", target, cmdline);
}

char * str_config  = NULL;
int    size_config = 0;
int    len_config  = 0;

/*
 * Grow the configuration string to a desired length.
 * Usually the first growth is plenty.
 */
static void grow_config(int len)
{
	while (len_config + len > size_config) {
		if (size_config == 0)
			size_config = 2048;
		str_config = realloc(str_config, size_config *= 2);
		if (str_config == NULL)
			{ perror("fixdep:malloc"); exit(1); }
	}
}


/*
 * Lookup a value in the configuration string.
 */
static int is_defined_config(const char * name, int len)
{
	const char * pconfig;
	const char * plast = str_config + len_config - len;
	for ( pconfig = str_config + 1; pconfig < plast; pconfig++ ) {
		if (pconfig[ -1] == '\n'
		&&  pconfig[len] == '\n'
		&&  !memcmp(pconfig, name, len))
			return 1;
	}
	return 0;
}

/*
 * Add a new value to the configuration string.
 */
static void define_config(const char * name, int len)
{
	grow_config(len + 1);

	memcpy(str_config+len_config, name, len);
	len_config += len;
	str_config[len_config++] = '\n';
}

/*
 * Clear the set of configuration strings.
 */
static void clear_config(void)
{
	len_config = 0;
	define_config("", 0);
}

/*
 * Record the use of a CONFIG_* word.
 */
static void use_config(char *m, int slen)
{
	char s[PATH_MAX];
	char *p;

	if (is_defined_config(m, slen))
	    return;

	define_config(m, slen);

	memcpy(s, m, slen); s[slen] = 0;

	for (p = s; p < s + slen; p++) {
		if (*p == '_')
			*p = '/';
		else
			*p = tolower((int)*p);
	}
	printf("    $(wildcard include/config/%s.h) \\\n", s);
}

static void parse_config_file(char *map, size_t len)
{
	int *end = (int *) (map + len);
	/* start at +1, so that p can never be < map */
	int *m   = (int *) map + 1;
	char *p, *q;

	for (; m < end; m++) {
		if (*m == INT_CONF) { p = (char *) m  ; goto conf; }
		if (*m == INT_ONFI) { p = (char *) m-1; goto conf; }
		if (*m == INT_NFIG) { p = (char *) m-2; goto conf; }
		if (*m == INT_FIG_) { p = (char *) m-3; goto conf; }
		continue;
	conf:
		if (p > map + len - 7)
			continue;
		if (memcmp(p, "CONFIG_", 7))
			continue;
		for (q = p + 7; q < map + len; q++) {
			if (!(isalnum(*q) || *q == '_'))
				goto found;
		}
		continue;

	found:
		if (!memcmp(q - 7, "_MODULE", 7))
			q -= 7;
		if( (q-p-7) < 0 )
			continue;
		use_config(p+7, q-p-7);
	}
}

/* test is s ends in sub */
static int strrcmp(char *s, char *sub)
{
	int slen = strlen(s);
	int sublen = strlen(sub);

	if (sublen > slen)
		return 1;

	return memcmp(s + slen - sublen, sub, sublen);
}

static void do_config_file(char *filename)
{
	struct stat st;
	int fd;
	void *map;

	fd = open(filename, O_RDONLY);
	if (fd < 0) {
		fprintf(stderr, "fixdep: ");
		perror(filename);
		exit(2);
	}
	fstat(fd, &st);
	if (st.st_size == 0) {
		close(fd);
		return;
	}
	map = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
	if ((long) map == -1) {
		perror("fixdep: mmap");
		close(fd);
		return;
	}

	parse_config_file(map, st.st_size);

	munmap(map, st.st_size);

	close(fd);
}

static void parse_dep_file(void *map, size_t len)
{
	char *m = map;
	char *end = m + len;
	char *p;
	char s[PATH_MAX];

	p = strchr(m, ':');
	if (!p) {
		fprintf(stderr, "fixdep: parse error\n");
		exit(1);
	}
	memcpy(s, m, p-m); s[p-m] = 0;
	printf("deps_%s := \\\n", target);
	m = p+1;

	clear_config();

	while (m < end) {
		while (m < end && (*m == ' ' || *m == '\\' || *m == '\n'))
			m++;
		p = m;
		while (p < end && *p != ' ') p++;
		if (p == end) {
			do p--; while (!isalnum(*p));
			p++;
		}
		memcpy(s, m, p-m); s[p-m] = 0;
		if (strrcmp(s, "include/generated/autoconf.h") &&
		    strrcmp(s, "arch/um/include/uml-config.h") &&
		    strrcmp(s, ".ver")) {
			printf("  %s \\\n", s);
			do_config_file(s);
		}
		m = p + 1;
	}
	printf("\n%s: $(deps_%s)\n\n", target, target);
	printf("$(deps_%s):\n", target);
}

static void print_deps(void)
{
	struct stat st;
	int fd;
	void *map;

	fd = open(depfile, O_RDONLY);
	if (fd < 0) {
		fprintf(stderr, "fixdep: ");
		perror(depfile);
		exit(2);
	}
	fstat(fd, &st);
	if (st.st_size == 0) {
		fprintf(stderr,"fixdep: %s is empty\n",depfile);
		close(fd);
		return;
	}
	map = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
	if ((long) map == -1) {
		perror("fixdep: mmap");
		close(fd);
		return;
	}

	parse_dep_file(map, st.st_size);

	munmap(map, st.st_size);

	close(fd);
}

static void traps(void)
{
	static char test[] __attribute__((aligned(sizeof(int)))) = "CONF";
	int *p = (int *)test;

	if (*p != INT_CONF) {
		fprintf(stderr, "fixdep: sizeof(int) != 4 or wrong endianess? %#x\n",
			*p);
		exit(2);
	}
}

int main(int argc, char *argv[])
{
	traps();

	if (argc != 4)
		usage();

	depfile = argv[1];
	target = argv[2];
	cmdline = argv[3];

	print_cmdline();
	print_deps();

	return 0;
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* "Optimize" a list of dependencies as spit out by gcc -MD
	3	* for the kernel build
	4	* ===========================================================================
	5	*
	6	* Author Kai Germaschewski
	7	* Copyright 2002 by Kai Germaschewski <kai.germaschewski@gmx.de>
	8	*
	9	* This software may be used and distributed according to the terms
	10	* of the GNU General Public License, incorporated herein by reference.
	11	*
	12	*
	13	* Introduction:
	14	*
	15	* gcc produces a very nice and correct list of dependencies which
	16	* tells make when to remake a file.
	17	*
	18	* To use this list as-is however has the drawback that virtually
264a2683	19	* every file in the kernel includes autoconf.h.
1da177e4	20	*
264a2683	21	* If the user re-runs make *config, autoconf.h will be
1da177e4 LT	22	* regenerated. make notices that and will rebuild every file which
	23	* includes autoconf.h, i.e. basically all files. This is extremely
	24	* annoying if the user just changed CONFIG_HIS_DRIVER from n to m.
	25	*
	26	* So we play the same trick that "mkdep" played before. We replace
264a2683	27	* the dependency on autoconf.h by a dependency on every config
1da177e4 LT	28	* option which is mentioned in any of the listed prequisites.
1da177e4 LT	29	*
c21b1e4d JB	30	* kconfig populates a tree in include/config/ with an empty file
	31	* for each config symbol and when the configuration is updated
	32	* the files representing changed config options are touched
	33	* which then let make pick up the changes and the files that use
	34	* the config symbols are rebuilt.
1da177e4 LT	35	*
	36	* So if the user changes his CONFIG_HIS_DRIVER option, only the objects
	37	* which depend on "include/linux/config/his/driver.h" will be rebuilt,
	38	* so most likely only his driver ;-)
	39	*
	40	* The idea above dates, by the way, back to Michael E Chastain, AFAIK.
	41	*
	42	* So to get dependencies right, there are two issues:
	43	* o if any of the files the compiler read changed, we need to rebuild
	44	* o if the command line given to the compile the file changed, we
	45	* better rebuild as well.
	46	*
	47	* The former is handled by using the -MD output, the later by saving
	48	* the command line used to compile the old object and comparing it
	49	* to the one we would now use.
	50	*
	51	* Again, also this idea is pretty old and has been discussed on
	52	* kbuild-devel a long time ago. I don't have a sensibly working
	53	* internet connection right now, so I rather don't mention names
	54	* without double checking.
	55	*
	56	* This code here has been based partially based on mkdep.c, which
	57	* says the following about its history:
	58	*
	59	* Copyright abandoned, Michael Chastain, <mailto:mec@shout.net>.
	60	* This is a C version of syncdep.pl by Werner Almesberger.
	61	*
	62	*
	63	* It is invoked as
	64	*
	65	* fixdep <depfile> <target> <cmdline>
	66	*
	67	* and will read the dependency file <depfile>
	68	*
	69	* The transformed dependency snipped is written to stdout.
	70	*
	71	* It first generates a line
	72	*
	73	* cmd_<target> = <cmdline>
	74	*
	75	* and then basically copies the .<target>.d file to stdout, in the
264a2683	76	* process filtering out the dependency on autoconf.h and adding
1da177e4 LT	77	* dependencies on include/config/my/option.h for every
	78	* CONFIG_MY_OPTION encountered in any of the prequisites.
	79	*
	80	* It will also filter out all the dependencies on *.ver. We need
	81	* to make sure that the generated version checksum are globally up
	82	* to date before even starting the recursive build, so it's too late
	83	* at this point anyway.
	84	*
	85	* The algorithm to grep for "CONFIG_..." is bit unusual, but should
	86	* be fast ;-) We don't even try to really parse the header files, but
	87	* merely grep, i.e. if CONFIG_FOO is mentioned in a comment, it will
	88	* be picked up as well. It's not a problem with respect to
	89	* correctness, since that can only give too many dependencies, thus
	90	* we cannot miss a rebuild. Since people tend to not mention totally
	91	* unrelated CONFIG_ options all over the place, it's not an
	92	* efficiency problem either.
	93	*
	94	* (Note: it'd be easy to port over the complete mkdep state machine,
	95	* but I don't think the added complexity is worth it)
	96	*/
	97	/*
	98	* Note 2: if somebody writes HELLO_CONFIG_BOOM in a file, it will depend onto
	99	* CONFIG_BOOM. This could seem a bug (not too hard to fix), but please do not
	100	* fix it! Some UserModeLinux files (look at arch/um/) call CONFIG_BOOM as
	101	* UML_CONFIG_BOOM, to avoid conflicts with /usr/include/linux/autoconf.h,
	102	* through arch/um/include/uml-config.h; this fixdep "bug" makes sure that
	103	* those files will have correct dependencies.
	104	*/
	105
	106	#include <sys/types.h>
	107	#include <sys/stat.h>
	108	#include <sys/mman.h>
	109	#include <unistd.h>
	110	#include <fcntl.h>
	111	#include <string.h>
	112	#include <stdlib.h>
	113	#include <stdio.h>
	114	#include <limits.h>
	115	#include <ctype.h>
	116	#include <arpa/inet.h>
	117
	118	#define INT_CONF ntohl(0x434f4e46)
	119	#define INT_ONFI ntohl(0x4f4e4649)
	120	#define INT_NFIG ntohl(0x4e464947)
	121	#define INT_FIG_ ntohl(0x4649475f)
	122
	123	char *target;
	124	char *depfile;
	125	char *cmdline;
	126
4356f489	127	static void usage(void)
1da177e4 LT	128	{
	129	fprintf(stderr, "Usage: fixdep <depfile> <target> <cmdline>\n");
	130	exit(1);
	131	}
	132
4d99f93b SR	133	/*
4d99f93b SR	134	* Print out the commandline prefixed with cmd_<target filename> :=
6176aa9a	135	*/
4356f489	136	static void print_cmdline(void)
1da177e4	137	{
6176aa9a	138	printf("cmd_%s := %s\n\n", target, cmdline);
1da177e4 LT	139	}
	140
	141	char * str_config = NULL;
	142	int size_config = 0;
	143	int len_config = 0;
	144
	145	/*
	146	* Grow the configuration string to a desired length.
	147	* Usually the first growth is plenty.
	148	*/
4356f489	149	static void grow_config(int len)
1da177e4 LT	150	{
	151	while (len_config + len > size_config) {
	152	if (size_config == 0)
	153	size_config = 2048;
	154	str_config = realloc(str_config, size_config *= 2);
	155	if (str_config == NULL)
	156	{ perror("fixdep:malloc"); exit(1); }
	157	}
	158	}
	159
	160
	161
	162	/*
	163	* Lookup a value in the configuration string.
	164	*/
4356f489	165	static int is_defined_config(const char * name, int len)
1da177e4 LT	166	{
	167	const char * pconfig;
	168	const char * plast = str_config + len_config - len;
	169	for ( pconfig = str_config + 1; pconfig < plast; pconfig++ ) {
	170	if (pconfig[ -1] == '\n'
	171	&& pconfig[len] == '\n'
	172	&& !memcmp(pconfig, name, len))
	173	return 1;
	174	}
	175	return 0;
	176	}
	177
	178	/*
	179	* Add a new value to the configuration string.
	180	*/
4356f489	181	static void define_config(const char * name, int len)
1da177e4 LT	182	{
	183	grow_config(len + 1);
	184
	185	memcpy(str_config+len_config, name, len);
	186	len_config += len;
	187	str_config[len_config++] = '\n';
	188	}
	189
	190	/*
	191	* Clear the set of configuration strings.
	192	*/
4356f489	193	static void clear_config(void)
1da177e4 LT	194	{
	195	len_config = 0;
	196	define_config("", 0);
	197	}
	198
	199	/*
	200	* Record the use of a CONFIG_* word.
	201	*/
4356f489	202	static void use_config(char *m, int slen)
1da177e4 LT	203	{
	204	char s[PATH_MAX];
	205	char *p;
	206
	207	if (is_defined_config(m, slen))
	208	return;
	209
	210	define_config(m, slen);
	211
	212	memcpy(s, m, slen); s[slen] = 0;
	213
	214	for (p = s; p < s + slen; p++) {
	215	if (*p == '_')
	216	*p = '/';
	217	else
48b9d03c	218	p = tolower((int)p);
1da177e4 LT	219	}
	220	printf(" $(wildcard include/config/%s.h) \\\n", s);
	221	}
	222
4356f489	223	static void parse_config_file(char *map, size_t len)
1da177e4 LT	224	{
	225	int end = (int ) (map + len);
	226	/* start at +1, so that p can never be < map */
	227	int m = (int ) map + 1;
48b9d03c	228	char p, q;
1da177e4 LT	229
1da177e4 LT	230	for (; m < end; m++) {
48b9d03c M	231	if (m == INT_CONF) { p = (char ) m ; goto conf; }
	232	if (m == INT_ONFI) { p = (char ) m-1; goto conf; }
	233	if (m == INT_NFIG) { p = (char ) m-2; goto conf; }
	234	if (m == INT_FIG_) { p = (char ) m-3; goto conf; }
1da177e4 LT	235	continue;
	236	conf:
	237	if (p > map + len - 7)
	238	continue;
	239	if (memcmp(p, "CONFIG_", 7))
	240	continue;
	241	for (q = p + 7; q < map + len; q++) {
	242	if (!(isalnum(q) \|\| q == '_'))
	243	goto found;
	244	}
	245	continue;
	246
	247	found:
c21b1e4d JB	248	if (!memcmp(q - 7, "_MODULE", 7))
c21b1e4d JB	249	q -= 7;
04c58f81 AG	250	if( (q-p-7) < 0 )
04c58f81 AG	251	continue;
1da177e4 LT	252	use_config(p+7, q-p-7);
	253	}
	254	}
	255
	256	/* test is s ends in sub */
4356f489	257	static int strrcmp(char s, char sub)
1da177e4 LT	258	{
	259	int slen = strlen(s);
	260	int sublen = strlen(sub);
	261
	262	if (sublen > slen)
	263	return 1;
	264
	265	return memcmp(s + slen - sublen, sub, sublen);
	266	}
	267
4356f489	268	static void do_config_file(char *filename)
1da177e4 LT	269	{
	270	struct stat st;
	271	int fd;
	272	void *map;
	273
	274	fd = open(filename, O_RDONLY);
	275	if (fd < 0) {
	276	fprintf(stderr, "fixdep: ");
	277	perror(filename);
	278	exit(2);
	279	}
	280	fstat(fd, &st);
	281	if (st.st_size == 0) {
	282	close(fd);
	283	return;
	284	}
	285	map = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
	286	if ((long) map == -1) {
	287	perror("fixdep: mmap");
	288	close(fd);
	289	return;
	290	}
	291
	292	parse_config_file(map, st.st_size);
	293
	294	munmap(map, st.st_size);
	295
	296	close(fd);
	297	}
	298
4356f489	299	static void parse_dep_file(void *map, size_t len)
1da177e4	300	{
48b9d03c M	301	char *m = map;
	302	char *end = m + len;
	303	char *p;
1da177e4 LT	304	char s[PATH_MAX];
	305
	306	p = strchr(m, ':');
	307	if (!p) {
	308	fprintf(stderr, "fixdep: parse error\n");
	309	exit(1);
	310	}
	311	memcpy(s, m, p-m); s[p-m] = 0;
	312	printf("deps_%s := \\\n", target);
	313	m = p+1;
	314
	315	clear_config();
	316
	317	while (m < end) {
	318	while (m < end && (m == ' ' \|\| m == '\\' \|\| *m == '\n'))
	319	m++;
	320	p = m;
	321	while (p < end && *p != ' ') p++;
	322	if (p == end) {
	323	do p--; while (!isalnum(*p));
	324	p++;
	325	}
	326	memcpy(s, m, p-m); s[p-m] = 0;
264a2683	327	if (strrcmp(s, "include/generated/autoconf.h") &&
1da177e4 LT	328	strrcmp(s, "arch/um/include/uml-config.h") &&
	329	strrcmp(s, ".ver")) {
	330	printf(" %s \\\n", s);
	331	do_config_file(s);
	332	}
	333	m = p + 1;
	334	}
	335	printf("\n%s: $(deps_%s)\n\n", target, target);
	336	printf("$(deps_%s):\n", target);
	337	}
	338
4356f489	339	static void print_deps(void)
1da177e4 LT	340	{
	341	struct stat st;
	342	int fd;
	343	void *map;
	344
	345	fd = open(depfile, O_RDONLY);
	346	if (fd < 0) {
	347	fprintf(stderr, "fixdep: ");
	348	perror(depfile);
	349	exit(2);
	350	}
	351	fstat(fd, &st);
	352	if (st.st_size == 0) {
	353	fprintf(stderr,"fixdep: %s is empty\n",depfile);
	354	close(fd);
	355	return;
	356	}
	357	map = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
	358	if ((long) map == -1) {
	359	perror("fixdep: mmap");
	360	close(fd);
	361	return;
	362	}
	363
	364	parse_dep_file(map, st.st_size);
	365
	366	munmap(map, st.st_size);
	367
	368	close(fd);
	369	}
	370
4356f489	371	static void traps(void)
1da177e4 LT	372	{
1da177e4 LT	373	static char test[] __attribute__((aligned(sizeof(int)))) = "CONF";
d067aa74	374	int p = (int )test;
1da177e4	375
d067aa74	376	if (*p != INT_CONF) {
1da177e4	377	fprintf(stderr, "fixdep: sizeof(int) != 4 or wrong endianess? %#x\n",
d067aa74	378	*p);
1da177e4 LT	379	exit(2);
	380	}
	381	}
	382
	383	int main(int argc, char *argv[])
	384	{
	385	traps();
	386
	387	if (argc != 4)
	388	usage();
	389
	390	depfile = argv[1];
	391	target = argv[2];
	392	cmdline = argv[3];
	393
	394	print_cmdline();
	395	print_deps();
	396
	397	return 0;
	398	}