[J-u-boot.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  <[email protected]>
 *
 * 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 prerequisites.
 *
 * 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/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:[email protected]>.
 *   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 prerequisites.
 *
 * 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.
 *
 * 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)
 */

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

int is_spl_build = 0; /* hack for U-Boot */

static void usage(void)
{
	fprintf(stderr, "Usage: fixdep [-e] <depfile> <target> <cmdline>\n");
	fprintf(stderr, " -e  insert extra dependencies given on stdin\n");
	exit(1);
}

/*
 * Print out a dependency path from a symbol name
 */
static void print_dep(const char *m, int slen, const char *dir)
{
	int c, prev_c = '/', i;

	printf("    $(wildcard %s/", dir);
	for (i = 0; i < slen; i++) {
		c = m[i];
		if (c == '_')
			c = '/';
		else
			c = tolower(c);
		if (c != '/' || prev_c != '/')
			putchar(c);
		prev_c = c;
	}
	printf(".h) \\\n");
}

static void do_extra_deps(void)
{
	char buf[80];

	while (fgets(buf, sizeof(buf), stdin)) {
		int len = strlen(buf);

		if (len < 2 || buf[len - 1] != '\n') {
			fprintf(stderr, "fixdep: bad data on stdin\n");
			exit(1);
		}
		print_dep(buf, len - 1, "include/ksym");
	}
}

struct item {
	struct item	*next;
	unsigned int	len;
	unsigned int	hash;
	char		name[0];
};

#define HASHSZ 256
static struct item *hashtab[HASHSZ];

static unsigned int strhash(const char *str, unsigned int sz)
{
	/* fnv32 hash */
	unsigned int i, hash = 2166136261U;

	for (i = 0; i < sz; i++)
		hash = (hash ^ str[i]) * 0x01000193;
	return hash;
}

/*
 * Lookup a value in the configuration string.
 */
static int is_defined_config(const char *name, int len, unsigned int hash)
{
	struct item *aux;

	for (aux = hashtab[hash % HASHSZ]; aux; aux = aux->next) {
		if (aux->hash == hash && aux->len == len &&
		    memcmp(aux->name, name, len) == 0)
			return 1;
	}
	return 0;
}

/*
 * Add a new value to the configuration string.
 */
static void define_config(const char *name, int len, unsigned int hash)
{
	struct item *aux = malloc(sizeof(*aux) + len);

	if (!aux) {
		perror("fixdep:malloc");
		exit(1);
	}
	memcpy(aux->name, name, len);
	aux->len = len;
	aux->hash = hash;
	aux->next = hashtab[hash % HASHSZ];
	hashtab[hash % HASHSZ] = aux;
}

/*
 * Record the use of a CONFIG_* word.
 */
static void use_config(const char *m, int slen)
{
	unsigned int hash = strhash(m, slen);

	if (is_defined_config(m, slen, hash))
	    return;

	define_config(m, slen, hash);
	print_dep(m, slen, "include/config");
}

/* test if s ends in sub */
static int str_ends_with(const char *s, int slen, const char *sub)
{
	int sublen = strlen(sub);

	if (sublen > slen)
		return 0;

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

static void parse_config_file(const char *p)
{
	const char *q, *r;
	const char *start = p;
	char tmp_buf[256] = "SPL_"; /* hack for U-Boot */

	while ((p = strstr(p, "CONFIG_"))) {
		if (p > start && (isalnum(p[-1]) || p[-1] == '_')) {
			p += 7;
			continue;
		}
		p += 7;
		q = p;
		while (*q && (isalnum(*q) || *q == '_'))
			q++;
		if (str_ends_with(p, q - p, "_MODULE"))
			r = q - 7;
		else
			r = q;
		/*
		 * U-Boot also handles
		 *   CONFIG_IS_ENABLED(...)
		 *   CONFIG_IS_BUILTIN(...)
		 *   CONFIG_IS_MODULE(...)
		 *   CONFIG_VAL(...)
		 */
		if ((q - p == 10 && !memcmp(p, "IS_ENABLED(", 11)) ||
		    (q - p == 10 && !memcmp(p, "IS_BUILTIN(", 11)) ||
		    (q - p == 9 && !memcmp(p, "IS_MODULE(", 10)) ||
		    (q - p == 3 && !memcmp(p, "VAL(", 4))) {
			p = q + 1;
			while (isalnum(*q) || *q == '_')
				q++;
			r = q;
			if (r > p && is_spl_build) {
				memcpy(tmp_buf + 4, p, r - p);
				r = tmp_buf + 4 + (r - p);
				p = tmp_buf;
			}
		}
		/* end U-Boot hack */

		if (r > p)
			use_config(p, r - p);
		p = q;
	}
}

static void *read_file(const char *filename)
{
	struct stat st;
	int fd;
	char *buf;

	fd = open(filename, O_RDONLY);
	if (fd < 0) {
		fprintf(stderr, "fixdep: error opening file: ");
		perror(filename);
		exit(2);
	}
	if (fstat(fd, &st) < 0) {
		fprintf(stderr, "fixdep: error fstat'ing file: ");
		perror(filename);
		exit(2);
	}
	buf = malloc(st.st_size + 1);
	if (!buf) {
		perror("fixdep: malloc");
		exit(2);
	}
	if (read(fd, buf, st.st_size) != st.st_size) {
		perror("fixdep: read");
		exit(2);
	}
	buf[st.st_size] = '\0';
	close(fd);

	return buf;
}

/* Ignore certain dependencies */
static int is_ignored_file(const char *s, int len)
{
	return str_ends_with(s, len, "include/generated/autoconf.h") ||
	       str_ends_with(s, len, "include/generated/autoksyms.h") ||
	       str_ends_with(s, len, ".ver");
}

/*
 * Important: The below generated source_foo.o and deps_foo.o variable
 * assignments are parsed not only by make, but also by the rather simple
 * parser in scripts/mod/sumversion.c.
 */
static void parse_dep_file(char *m, const char *target, int insert_extra_deps)
{
	char *p;
	int is_last, is_target;
	int saw_any_target = 0;
	int is_first_dep = 0;
	void *buf;

	while (1) {
		/* Skip any "white space" */
		while (*m == ' ' || *m == '\\' || *m == '\n')
			m++;

		if (!*m)
			break;

		/* Find next "white space" */
		p = m;
		while (*p && *p != ' ' && *p != '\\' && *p != '\n')
			p++;
		is_last = (*p == '\0');
		/* Is the token we found a target name? */
		is_target = (*(p-1) == ':');
		/* Don't write any target names into the dependency file */
		if (is_target) {
			/* The /next/ file is the first dependency */
			is_first_dep = 1;
		} else if (!is_ignored_file(m, p - m)) {
			*p = '\0';

			/*
			 * Do not list the source file as dependency, so that
			 * kbuild is not confused if a .c file is rewritten
			 * into .S or vice versa. Storing it in source_* is
			 * needed for modpost to compute srcversions.
			 */
			if (is_first_dep) {
				/*
				 * If processing the concatenation of multiple
				 * dependency files, only process the first
				 * target name, which will be the original
				 * source name, and ignore any other target
				 * names, which will be intermediate temporary
				 * files.
				 */
				if (!saw_any_target) {
					saw_any_target = 1;
					printf("source_%s := %s\n\n",
					       target, m);
					printf("deps_%s := \\\n", target);
				}
				is_first_dep = 0;
			} else {
				printf("  %s \\\n", m);
			}

			buf = read_file(m);
			parse_config_file(buf);
			free(buf);
		}

		if (is_last)
			break;

		/*
		 * Start searching for next token immediately after the first
		 * "whitespace" character that follows this token.
		 */
		m = p + 1;
	}

	if (!saw_any_target) {
		fprintf(stderr, "fixdep: parse error; no targets found\n");
		exit(1);
	}

	if (insert_extra_deps)
		do_extra_deps();

	printf("\n%s: $(deps_%s)\n\n", target, target);
	printf("$(deps_%s):\n", target);
}

int main(int argc, char *argv[])
{
	const char *depfile, *target, *cmdline;
	int insert_extra_deps = 0;
	void *buf;

	if (argc == 5 && !strcmp(argv[1], "-e")) {
		insert_extra_deps = 1;
		argv++;
	} else if (argc != 4)
		usage();

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

	/* hack for U-Boot */
	if (!strncmp(target, "spl/", 4) || !strncmp(target, "tpl/", 4))
		is_spl_build = 1;

	printf("cmd_%s := %s\n\n", target, cmdline);

	buf = read_file(depfile);
	parse_dep_file(buf, target, insert_extra_deps);
	free(buf);

	return 0;
}
Commit	Line	Data
22433fc5 MY	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 <[email protected]>
	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
	19	* every file in the kernel includes autoconf.h.
	20	*
	21	* If the user re-runs make *config, autoconf.h will be
	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
	27	* the dependency on autoconf.h by a dependency on every config
67f2ee86	28	* option which is mentioned in any of the listed prerequisites.
22433fc5 MY	29	*
	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.
	35	*
	36	* So if the user changes his CONFIG_HIS_DRIVER option, only the objects
67f2ee86	37	* which depend on "include/config/his/driver.h" will be rebuilt,
22433fc5 MY	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:[email protected]>.
	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
	76	* process filtering out the dependency on autoconf.h and adding
	77	* dependencies on include/config/my/option.h for every
67f2ee86	78	* CONFIG_MY_OPTION encountered in any of the prerequisites.
22433fc5 MY	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	*
67f2ee86	85	* We don't even try to really parse the header files, but
22433fc5 MY	86	* merely grep, i.e. if CONFIG_FOO is mentioned in a comment, it will
	87	* be picked up as well. It's not a problem with respect to
	88	* correctness, since that can only give too many dependencies, thus
	89	* we cannot miss a rebuild. Since people tend to not mention totally
	90	* unrelated CONFIG_ options all over the place, it's not an
	91	* efficiency problem either.
	92	*
	93	* (Note: it'd be easy to port over the complete mkdep state machine,
	94	* but I don't think the added complexity is worth it)
	95	*/
22433fc5 MY	96
	97	#include <sys/types.h>
	98	#include <sys/stat.h>
22433fc5 MY	99	#include <unistd.h>
	100	#include <fcntl.h>
	101	#include <string.h>
	102	#include <stdlib.h>
	103	#include <stdio.h>
22433fc5	104	#include <ctype.h>
22433fc5	105
a187559e	106	int is_spl_build = 0; /* hack for U-Boot */
22433fc5 MY	107
	108	static void usage(void)
	109	{
67f2ee86 TR	110	fprintf(stderr, "Usage: fixdep [-e] <depfile> <target> <cmdline>\n");
67f2ee86 TR	111	fprintf(stderr, " -e insert extra dependencies given on stdin\n");
22433fc5 MY	112	exit(1);
	113	}
	114
	115	/*
67f2ee86	116	* Print out a dependency path from a symbol name
22433fc5	117	*/
67f2ee86	118	static void print_dep(const char m, int slen, const char dir)
22433fc5	119	{
5972ff07	120	int c, prev_c = '/', i;
67f2ee86 TR	121
	122	printf(" $(wildcard %s/", dir);
	123	for (i = 0; i < slen; i++) {
	124	c = m[i];
	125	if (c == '_')
	126	c = '/';
	127	else
	128	c = tolower(c);
5972ff07 TR	129	if (c != '/' \|\| prev_c != '/')
	130	putchar(c);
	131	prev_c = c;
67f2ee86 TR	132	}
	133	printf(".h) \\\n");
	134	}
	135
	136	static void do_extra_deps(void)
	137	{
	138	char buf[80];
	139
	140	while (fgets(buf, sizeof(buf), stdin)) {
	141	int len = strlen(buf);
	142
	143	if (len < 2 \|\| buf[len - 1] != '\n') {
	144	fprintf(stderr, "fixdep: bad data on stdin\n");
	145	exit(1);
	146	}
	147	print_dep(buf, len - 1, "include/ksym");
	148	}
22433fc5 MY	149	}
	150
	151	struct item {
	152	struct item *next;
	153	unsigned int len;
	154	unsigned int hash;
	155	char name[0];
	156	};
	157
	158	#define HASHSZ 256
	159	static struct item *hashtab[HASHSZ];
	160
	161	static unsigned int strhash(const char *str, unsigned int sz)
	162	{
	163	/* fnv32 hash */
	164	unsigned int i, hash = 2166136261U;
	165
	166	for (i = 0; i < sz; i++)
	167	hash = (hash ^ str[i]) * 0x01000193;
	168	return hash;
	169	}
	170
	171	/*
	172	* Lookup a value in the configuration string.
	173	*/
	174	static int is_defined_config(const char *name, int len, unsigned int hash)
	175	{
	176	struct item *aux;
	177
	178	for (aux = hashtab[hash % HASHSZ]; aux; aux = aux->next) {
	179	if (aux->hash == hash && aux->len == len &&
	180	memcmp(aux->name, name, len) == 0)
	181	return 1;
	182	}
	183	return 0;
	184	}
	185
	186	/*
	187	* Add a new value to the configuration string.
	188	*/
	189	static void define_config(const char *name, int len, unsigned int hash)
	190	{
	191	struct item aux = malloc(sizeof(aux) + len);
	192
	193	if (!aux) {
	194	perror("fixdep:malloc");
	195	exit(1);
	196	}
	197	memcpy(aux->name, name, len);
	198	aux->len = len;
	199	aux->hash = hash;
	200	aux->next = hashtab[hash % HASHSZ];
	201	hashtab[hash % HASHSZ] = aux;
	202	}
	203
22433fc5 MY	204	/*
	205	* Record the use of a CONFIG_* word.
	206	*/
	207	static void use_config(const char *m, int slen)
	208	{
	209	unsigned int hash = strhash(m, slen);
22433fc5 MY	210
	211	if (is_defined_config(m, slen, hash))
	212	return;
	213
	214	define_config(m, slen, hash);
67f2ee86 TR	215	print_dep(m, slen, "include/config");
67f2ee86 TR	216	}
22433fc5	217
67f2ee86 TR	218	/* test if s ends in sub */
	219	static int str_ends_with(const char s, int slen, const char sub)
	220	{
	221	int sublen = strlen(sub);
	222
	223	if (sublen > slen)
	224	return 0;
	225
	226	return !memcmp(s + slen - sublen, sub, sublen);
22433fc5 MY	227	}
22433fc5 MY	228
67f2ee86	229	static void parse_config_file(const char *p)
22433fc5	230	{
67f2ee86 TR	231	const char q, r;
67f2ee86 TR	232	const char *start = p;
8be60f06	233	char tmp_buf[256] = "SPL_"; /* hack for U-Boot */
22433fc5	234
67f2ee86 TR	235	while ((p = strstr(p, "CONFIG_"))) {
	236	if (p > start && (isalnum(p[-1]) \|\| p[-1] == '_')) {
	237	p += 7;
22433fc5	238	continue;
22433fc5	239	}
67f2ee86 TR	240	p += 7;
	241	q = p;
	242	while (q && (isalnum(q) \|\| *q == '_'))
	243	q++;
	244	if (str_ends_with(p, q - p, "_MODULE"))
	245	r = q - 7;
	246	else
	247	r = q;
7d8e9e8e MY	248	/*
	249	* U-Boot also handles
	250	* CONFIG_IS_ENABLED(...)
	251	* CONFIG_IS_BUILTIN(...)
	252	* CONFIG_IS_MODULE(...)
	253	* CONFIG_VAL(...)
	254	*/
8be60f06 MY	255	if ((q - p == 10 && !memcmp(p, "IS_ENABLED(", 11)) \|\|
8be60f06 MY	256	(q - p == 10 && !memcmp(p, "IS_BUILTIN(", 11)) \|\|
7d8e9e8e MY	257	(q - p == 9 && !memcmp(p, "IS_MODULE(", 10)) \|\|
7d8e9e8e MY	258	(q - p == 3 && !memcmp(p, "VAL(", 4))) {
8be60f06	259	p = q + 1;
67f2ee86 TR	260	while (isalnum(q) \|\| q == '_')
	261	q++;
	262	r = q;
	263	if (r > p && is_spl_build) {
	264	memcpy(tmp_buf + 4, p, r - p);
	265	r = tmp_buf + 4 + (r - p);
8be60f06 MY	266	p = tmp_buf;
	267	}
	268	}
	269	/* end U-Boot hack */
	270
67f2ee86 TR	271	if (r > p)
	272	use_config(p, r - p);
	273	p = q;
22433fc5 MY	274	}
	275	}
	276
67f2ee86	277	static void read_file(const char filename)
22433fc5 MY	278	{
	279	struct stat st;
	280	int fd;
67f2ee86	281	char *buf;
22433fc5 MY	282
	283	fd = open(filename, O_RDONLY);
	284	if (fd < 0) {
67f2ee86	285	fprintf(stderr, "fixdep: error opening file: ");
22433fc5 MY	286	perror(filename);
	287	exit(2);
	288	}
c1420f8b	289	if (fstat(fd, &st) < 0) {
67f2ee86	290	fprintf(stderr, "fixdep: error fstat'ing file: ");
c1420f8b TR	291	perror(filename);
	292	exit(2);
	293	}
67f2ee86 TR	294	buf = malloc(st.st_size + 1);
	295	if (!buf) {
	296	perror("fixdep: malloc");
	297	exit(2);
22433fc5	298	}
67f2ee86 TR	299	if (read(fd, buf, st.st_size) != st.st_size) {
	300	perror("fixdep: read");
	301	exit(2);
22433fc5	302	}
67f2ee86 TR	303	buf[st.st_size] = '\0';
67f2ee86 TR	304	close(fd);
22433fc5	305
67f2ee86 TR	306	return buf;
67f2ee86 TR	307	}
22433fc5	308
67f2ee86 TR	309	/* Ignore certain dependencies */
	310	static int is_ignored_file(const char *s, int len)
	311	{
	312	return str_ends_with(s, len, "include/generated/autoconf.h") \|\|
	313	str_ends_with(s, len, "include/generated/autoksyms.h") \|\|
	314	str_ends_with(s, len, ".ver");
22433fc5 MY	315	}
	316
	317	/*
	318	* Important: The below generated source_foo.o and deps_foo.o variable
	319	* assignments are parsed not only by make, but also by the rather simple
	320	* parser in scripts/mod/sumversion.c.
	321	*/
67f2ee86	322	static void parse_dep_file(char m, const char target, int insert_extra_deps)
22433fc5	323	{
22433fc5	324	char *p;
67f2ee86	325	int is_last, is_target;
22433fc5 MY	326	int saw_any_target = 0;
22433fc5 MY	327	int is_first_dep = 0;
67f2ee86	328	void *buf;
22433fc5	329
67f2ee86	330	while (1) {
22433fc5	331	/* Skip any "white space" */
67f2ee86	332	while (m == ' ' \|\| m == '\\' \|\| *m == '\n')
22433fc5	333	m++;
67f2ee86 TR	334
	335	if (!*m)
	336	break;
	337
22433fc5 MY	338	/* Find next "white space" */
22433fc5 MY	339	p = m;
67f2ee86	340	while (p && p != ' ' && p != '\\' && p != '\n')
22433fc5	341	p++;
67f2ee86	342	is_last = (*p == '\0');
22433fc5 MY	343	/* Is the token we found a target name? */
	344	is_target = (*(p-1) == ':');
	345	/* Don't write any target names into the dependency file */
	346	if (is_target) {
	347	/* The /next/ file is the first dependency */
	348	is_first_dep = 1;
67f2ee86 TR	349	} else if (!is_ignored_file(m, p - m)) {
	350	*p = '\0';
	351
	352	/*
	353	* Do not list the source file as dependency, so that
	354	* kbuild is not confused if a .c file is rewritten
	355	* into .S or vice versa. Storing it in source_* is
	356	* needed for modpost to compute srcversions.
	357	*/
	358	if (is_first_dep) {
22433fc5	359	/*
67f2ee86 TR	360	* If processing the concatenation of multiple
	361	* dependency files, only process the first
	362	* target name, which will be the original
	363	* source name, and ignore any other target
	364	* names, which will be intermediate temporary
	365	* files.
22433fc5	366	*/
67f2ee86 TR	367	if (!saw_any_target) {
	368	saw_any_target = 1;
	369	printf("source_%s := %s\n\n",
	370	target, m);
	371	printf("deps_%s := \\\n", target);
	372	}
	373	is_first_dep = 0;
	374	} else {
	375	printf(" %s \\\n", m);
22433fc5	376	}
67f2ee86 TR	377
	378	buf = read_file(m);
	379	parse_config_file(buf);
	380	free(buf);
22433fc5	381	}
67f2ee86 TR	382
	383	if (is_last)
	384	break;
	385
22433fc5 MY	386	/*
	387	* Start searching for next token immediately after the first
	388	* "whitespace" character that follows this token.
	389	*/
	390	m = p + 1;
	391	}
	392
	393	if (!saw_any_target) {
	394	fprintf(stderr, "fixdep: parse error; no targets found\n");
	395	exit(1);
	396	}
	397
67f2ee86 TR	398	if (insert_extra_deps)
	399	do_extra_deps();
	400
22433fc5 MY	401	printf("\n%s: $(deps_%s)\n\n", target, target);
	402	printf("$(deps_%s):\n", target);
	403	}
	404
22433fc5 MY	405	int main(int argc, char *argv[])
22433fc5 MY	406	{
67f2ee86 TR	407	const char depfile, target, *cmdline;
	408	int insert_extra_deps = 0;
	409	void *buf;
	410
	411	if (argc == 5 && !strcmp(argv[1], "-e")) {
	412	insert_extra_deps = 1;
	413	argv++;
	414	} else if (argc != 4)
22433fc5 MY	415	usage();
	416
	417	depfile = argv[1];
	418	target = argv[2];
	419	cmdline = argv[3];
	420
a187559e	421	/* hack for U-Boot */
8be60f06 MY	422	if (!strncmp(target, "spl/", 4) \|\| !strncmp(target, "tpl/", 4))
	423	is_spl_build = 1;
	424
67f2ee86 TR	425	printf("cmd_%s := %s\n\n", target, cmdline);
	426
	427	buf = read_file(depfile);
	428	parse_dep_file(buf, target, insert_extra_deps);
	429	free(buf);
22433fc5 MY	430
	431	return 0;
	432	}