Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 |
Sam Ravnborg | 264a268 | 2009-10-18 00:49:24 +0200 | [diff] [blame] | 19 | * every file in the kernel includes autoconf.h. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | * |
Sam Ravnborg | 264a268 | 2009-10-18 00:49:24 +0200 | [diff] [blame] | 21 | * If the user re-runs make *config, autoconf.h will be |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 |
Sam Ravnborg | 264a268 | 2009-10-18 00:49:24 +0200 | [diff] [blame] | 27 | * the dependency on autoconf.h by a dependency on every config |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | * option which is mentioned in any of the listed prequisites. |
| 29 | * |
Jan Beulich | c21b1e4 | 2007-03-29 10:27:14 +0100 | [diff] [blame] | 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. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 |
Sam Ravnborg | 264a268 | 2009-10-18 00:49:24 +0200 | [diff] [blame] | 76 | * process filtering out the dependency on autoconf.h and adding |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Trevor Keith | 4356f48 | 2009-09-18 12:49:23 -0700 | [diff] [blame] | 127 | static void usage(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 128 | { |
| 129 | fprintf(stderr, "Usage: fixdep <depfile> <target> <cmdline>\n"); |
| 130 | exit(1); |
| 131 | } |
| 132 | |
Sam Ravnborg | 4d99f93 | 2005-12-25 23:21:14 +0100 | [diff] [blame] | 133 | /* |
| 134 | * Print out the commandline prefixed with cmd_<target filename> := |
Jan Beulich | 6176aa9 | 2006-01-30 10:04:27 +0100 | [diff] [blame] | 135 | */ |
Trevor Keith | 4356f48 | 2009-09-18 12:49:23 -0700 | [diff] [blame] | 136 | static void print_cmdline(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 137 | { |
Jan Beulich | 6176aa9 | 2006-01-30 10:04:27 +0100 | [diff] [blame] | 138 | printf("cmd_%s := %s\n\n", target, cmdline); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 139 | } |
| 140 | |
Eric Dumazet | 8af27e1 | 2010-11-09 16:29:27 +0100 | [diff] [blame] | 141 | struct item { |
| 142 | struct item *next; |
| 143 | unsigned int len; |
| 144 | unsigned int hash; |
| 145 | char name[0]; |
| 146 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 147 | |
Eric Dumazet | 8af27e1 | 2010-11-09 16:29:27 +0100 | [diff] [blame] | 148 | #define HASHSZ 256 |
| 149 | static struct item *hashtab[HASHSZ]; |
| 150 | |
| 151 | static unsigned int strhash(const char *str, unsigned int sz) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 152 | { |
Eric Dumazet | 8af27e1 | 2010-11-09 16:29:27 +0100 | [diff] [blame] | 153 | /* fnv32 hash */ |
| 154 | unsigned int i, hash = 2166136261U; |
| 155 | |
| 156 | for (i = 0; i < sz; i++) |
| 157 | hash = (hash ^ str[i]) * 0x01000193; |
| 158 | return hash; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 159 | } |
| 160 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 161 | /* |
| 162 | * Lookup a value in the configuration string. |
| 163 | */ |
Eric Dumazet | 8af27e1 | 2010-11-09 16:29:27 +0100 | [diff] [blame] | 164 | static int is_defined_config(const char *name, int len, unsigned int hash) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 165 | { |
Eric Dumazet | 8af27e1 | 2010-11-09 16:29:27 +0100 | [diff] [blame] | 166 | struct item *aux; |
| 167 | |
| 168 | for (aux = hashtab[hash % HASHSZ]; aux; aux = aux->next) { |
| 169 | if (aux->hash == hash && aux->len == len && |
| 170 | memcmp(aux->name, name, len) == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 171 | return 1; |
| 172 | } |
| 173 | return 0; |
| 174 | } |
| 175 | |
| 176 | /* |
| 177 | * Add a new value to the configuration string. |
| 178 | */ |
Eric Dumazet | 8af27e1 | 2010-11-09 16:29:27 +0100 | [diff] [blame] | 179 | static void define_config(const char *name, int len, unsigned int hash) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 180 | { |
Eric Dumazet | 8af27e1 | 2010-11-09 16:29:27 +0100 | [diff] [blame] | 181 | struct item *aux = malloc(sizeof(*aux) + len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | |
Eric Dumazet | 8af27e1 | 2010-11-09 16:29:27 +0100 | [diff] [blame] | 183 | if (!aux) { |
| 184 | perror("fixdep:malloc"); |
| 185 | exit(1); |
| 186 | } |
| 187 | memcpy(aux->name, name, len); |
| 188 | aux->len = len; |
| 189 | aux->hash = hash; |
| 190 | aux->next = hashtab[hash % HASHSZ]; |
| 191 | hashtab[hash % HASHSZ] = aux; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 192 | } |
| 193 | |
| 194 | /* |
| 195 | * Clear the set of configuration strings. |
| 196 | */ |
Trevor Keith | 4356f48 | 2009-09-18 12:49:23 -0700 | [diff] [blame] | 197 | static void clear_config(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 198 | { |
Eric Dumazet | 8af27e1 | 2010-11-09 16:29:27 +0100 | [diff] [blame] | 199 | struct item *aux, *next; |
| 200 | unsigned int i; |
| 201 | |
| 202 | for (i = 0; i < HASHSZ; i++) { |
| 203 | for (aux = hashtab[i]; aux; aux = next) { |
| 204 | next = aux->next; |
| 205 | free(aux); |
| 206 | } |
| 207 | hashtab[i] = NULL; |
| 208 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 209 | } |
| 210 | |
| 211 | /* |
| 212 | * Record the use of a CONFIG_* word. |
| 213 | */ |
Eric Dumazet | 8af27e1 | 2010-11-09 16:29:27 +0100 | [diff] [blame] | 214 | static void use_config(const char *m, int slen) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 215 | { |
Eric Dumazet | 8af27e1 | 2010-11-09 16:29:27 +0100 | [diff] [blame] | 216 | unsigned int hash = strhash(m, slen); |
| 217 | int c, i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 218 | |
Eric Dumazet | 8af27e1 | 2010-11-09 16:29:27 +0100 | [diff] [blame] | 219 | if (is_defined_config(m, slen, hash)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 220 | return; |
| 221 | |
Eric Dumazet | 8af27e1 | 2010-11-09 16:29:27 +0100 | [diff] [blame] | 222 | define_config(m, slen, hash); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 223 | |
Eric Dumazet | 8af27e1 | 2010-11-09 16:29:27 +0100 | [diff] [blame] | 224 | printf(" $(wildcard include/config/"); |
| 225 | for (i = 0; i < slen; i++) { |
| 226 | c = m[i]; |
| 227 | if (c == '_') |
| 228 | c = '/'; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 229 | else |
Eric Dumazet | 8af27e1 | 2010-11-09 16:29:27 +0100 | [diff] [blame] | 230 | c = tolower(c); |
| 231 | putchar(c); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 232 | } |
Eric Dumazet | 8af27e1 | 2010-11-09 16:29:27 +0100 | [diff] [blame] | 233 | printf(".h) \\\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 234 | } |
| 235 | |
Eric Dumazet | 8af27e1 | 2010-11-09 16:29:27 +0100 | [diff] [blame] | 236 | static void parse_config_file(const char *map, size_t len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 237 | { |
Eric Dumazet | 8af27e1 | 2010-11-09 16:29:27 +0100 | [diff] [blame] | 238 | const int *end = (const int *) (map + len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 239 | /* start at +1, so that p can never be < map */ |
Eric Dumazet | 8af27e1 | 2010-11-09 16:29:27 +0100 | [diff] [blame] | 240 | const int *m = (const int *) map + 1; |
| 241 | const char *p, *q; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 242 | |
| 243 | for (; m < end; m++) { |
J.A. Magallon | 48b9d03 | 2005-06-25 14:59:22 -0700 | [diff] [blame] | 244 | if (*m == INT_CONF) { p = (char *) m ; goto conf; } |
| 245 | if (*m == INT_ONFI) { p = (char *) m-1; goto conf; } |
| 246 | if (*m == INT_NFIG) { p = (char *) m-2; goto conf; } |
| 247 | if (*m == INT_FIG_) { p = (char *) m-3; goto conf; } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 248 | continue; |
| 249 | conf: |
| 250 | if (p > map + len - 7) |
| 251 | continue; |
| 252 | if (memcmp(p, "CONFIG_", 7)) |
| 253 | continue; |
| 254 | for (q = p + 7; q < map + len; q++) { |
| 255 | if (!(isalnum(*q) || *q == '_')) |
| 256 | goto found; |
| 257 | } |
| 258 | continue; |
| 259 | |
| 260 | found: |
Jan Beulich | c21b1e4 | 2007-03-29 10:27:14 +0100 | [diff] [blame] | 261 | if (!memcmp(q - 7, "_MODULE", 7)) |
| 262 | q -= 7; |
Andy Green | 04c58f8 | 2007-05-02 12:49:06 +0100 | [diff] [blame] | 263 | if( (q-p-7) < 0 ) |
| 264 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 265 | use_config(p+7, q-p-7); |
| 266 | } |
| 267 | } |
| 268 | |
| 269 | /* test is s ends in sub */ |
Trevor Keith | 4356f48 | 2009-09-18 12:49:23 -0700 | [diff] [blame] | 270 | static int strrcmp(char *s, char *sub) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 271 | { |
| 272 | int slen = strlen(s); |
| 273 | int sublen = strlen(sub); |
| 274 | |
| 275 | if (sublen > slen) |
| 276 | return 1; |
| 277 | |
| 278 | return memcmp(s + slen - sublen, sub, sublen); |
| 279 | } |
| 280 | |
Eric Dumazet | 8af27e1 | 2010-11-09 16:29:27 +0100 | [diff] [blame] | 281 | static void do_config_file(const char *filename) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 282 | { |
| 283 | struct stat st; |
| 284 | int fd; |
| 285 | void *map; |
| 286 | |
| 287 | fd = open(filename, O_RDONLY); |
| 288 | if (fd < 0) { |
Ben Gamari | a3ba811 | 2010-12-22 13:30:14 -0500 | [diff] [blame] | 289 | fprintf(stderr, "fixdep: error opening config file: "); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 290 | perror(filename); |
| 291 | exit(2); |
| 292 | } |
| 293 | fstat(fd, &st); |
| 294 | if (st.st_size == 0) { |
| 295 | close(fd); |
| 296 | return; |
| 297 | } |
| 298 | map = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0); |
| 299 | if ((long) map == -1) { |
| 300 | perror("fixdep: mmap"); |
| 301 | close(fd); |
| 302 | return; |
| 303 | } |
| 304 | |
| 305 | parse_config_file(map, st.st_size); |
| 306 | |
| 307 | munmap(map, st.st_size); |
| 308 | |
| 309 | close(fd); |
| 310 | } |
| 311 | |
Michal Marek | 7840fea | 2011-03-11 22:34:47 +0100 | [diff] [blame] | 312 | /* |
| 313 | * Important: The below generated source_foo.o and deps_foo.o variable |
| 314 | * assignments are parsed not only by make, but also by the rather simple |
| 315 | * parser in scripts/mod/sumversion.c. |
| 316 | */ |
Trevor Keith | 4356f48 | 2009-09-18 12:49:23 -0700 | [diff] [blame] | 317 | static void parse_dep_file(void *map, size_t len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 318 | { |
J.A. Magallon | 48b9d03 | 2005-06-25 14:59:22 -0700 | [diff] [blame] | 319 | char *m = map; |
| 320 | char *end = m + len; |
| 321 | char *p; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 322 | char s[PATH_MAX]; |
Michal Marek | b7bd182 | 2011-02-17 15:13:54 +0100 | [diff] [blame] | 323 | int first; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 324 | |
| 325 | p = strchr(m, ':'); |
| 326 | if (!p) { |
| 327 | fprintf(stderr, "fixdep: parse error\n"); |
| 328 | exit(1); |
| 329 | } |
| 330 | memcpy(s, m, p-m); s[p-m] = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 331 | m = p+1; |
| 332 | |
| 333 | clear_config(); |
| 334 | |
Michal Marek | b7bd182 | 2011-02-17 15:13:54 +0100 | [diff] [blame] | 335 | first = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 336 | while (m < end) { |
| 337 | while (m < end && (*m == ' ' || *m == '\\' || *m == '\n')) |
| 338 | m++; |
| 339 | p = m; |
| 340 | while (p < end && *p != ' ') p++; |
| 341 | if (p == end) { |
| 342 | do p--; while (!isalnum(*p)); |
| 343 | p++; |
| 344 | } |
| 345 | memcpy(s, m, p-m); s[p-m] = 0; |
Sam Ravnborg | 264a268 | 2009-10-18 00:49:24 +0200 | [diff] [blame] | 346 | if (strrcmp(s, "include/generated/autoconf.h") && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 347 | strrcmp(s, "arch/um/include/uml-config.h") && |
Peter Foley | 6a5be57 | 2011-08-01 09:51:24 -0400 | [diff] [blame] | 348 | strrcmp(s, "include/linux/kconfig.h") && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 349 | strrcmp(s, ".ver")) { |
Michal Marek | b7bd182 | 2011-02-17 15:13:54 +0100 | [diff] [blame] | 350 | /* |
Michal Marek | 7840fea | 2011-03-11 22:34:47 +0100 | [diff] [blame] | 351 | * Do not list the source file as dependency, so that |
| 352 | * kbuild is not confused if a .c file is rewritten |
| 353 | * into .S or vice versa. Storing it in source_* is |
| 354 | * needed for modpost to compute srcversions. |
Michal Marek | b7bd182 | 2011-02-17 15:13:54 +0100 | [diff] [blame] | 355 | */ |
Michal Marek | 7840fea | 2011-03-11 22:34:47 +0100 | [diff] [blame] | 356 | if (first) { |
| 357 | printf("source_%s := %s\n\n", target, s); |
| 358 | printf("deps_%s := \\\n", target); |
| 359 | } else |
Michal Marek | b7bd182 | 2011-02-17 15:13:54 +0100 | [diff] [blame] | 360 | printf(" %s \\\n", s); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 361 | do_config_file(s); |
| 362 | } |
Michal Marek | b7bd182 | 2011-02-17 15:13:54 +0100 | [diff] [blame] | 363 | first = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 364 | m = p + 1; |
| 365 | } |
| 366 | printf("\n%s: $(deps_%s)\n\n", target, target); |
| 367 | printf("$(deps_%s):\n", target); |
| 368 | } |
| 369 | |
Trevor Keith | 4356f48 | 2009-09-18 12:49:23 -0700 | [diff] [blame] | 370 | static void print_deps(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 371 | { |
| 372 | struct stat st; |
| 373 | int fd; |
| 374 | void *map; |
| 375 | |
| 376 | fd = open(depfile, O_RDONLY); |
| 377 | if (fd < 0) { |
Ben Gamari | a3ba811 | 2010-12-22 13:30:14 -0500 | [diff] [blame] | 378 | fprintf(stderr, "fixdep: error opening depfile: "); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 379 | perror(depfile); |
| 380 | exit(2); |
| 381 | } |
Ben Gamari | a3ba811 | 2010-12-22 13:30:14 -0500 | [diff] [blame] | 382 | if (fstat(fd, &st) < 0) { |
| 383 | fprintf(stderr, "fixdep: error fstat'ing depfile: "); |
| 384 | perror(depfile); |
| 385 | exit(2); |
| 386 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 387 | if (st.st_size == 0) { |
| 388 | fprintf(stderr,"fixdep: %s is empty\n",depfile); |
| 389 | close(fd); |
| 390 | return; |
| 391 | } |
| 392 | map = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0); |
| 393 | if ((long) map == -1) { |
| 394 | perror("fixdep: mmap"); |
| 395 | close(fd); |
| 396 | return; |
| 397 | } |
| 398 | |
| 399 | parse_dep_file(map, st.st_size); |
| 400 | |
| 401 | munmap(map, st.st_size); |
| 402 | |
| 403 | close(fd); |
| 404 | } |
| 405 | |
Trevor Keith | 4356f48 | 2009-09-18 12:49:23 -0700 | [diff] [blame] | 406 | static void traps(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 407 | { |
| 408 | static char test[] __attribute__((aligned(sizeof(int)))) = "CONF"; |
Amerigo Wang | d067aa7 | 2009-06-10 12:48:23 -0700 | [diff] [blame] | 409 | int *p = (int *)test; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 410 | |
Amerigo Wang | d067aa7 | 2009-06-10 12:48:23 -0700 | [diff] [blame] | 411 | if (*p != INT_CONF) { |
Masanari Iida | 8a168ca | 2012-12-29 02:00:09 +0900 | [diff] [blame] | 412 | fprintf(stderr, "fixdep: sizeof(int) != 4 or wrong endianness? %#x\n", |
Amerigo Wang | d067aa7 | 2009-06-10 12:48:23 -0700 | [diff] [blame] | 413 | *p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 414 | exit(2); |
| 415 | } |
| 416 | } |
| 417 | |
| 418 | int main(int argc, char *argv[]) |
| 419 | { |
| 420 | traps(); |
| 421 | |
| 422 | if (argc != 4) |
| 423 | usage(); |
| 424 | |
| 425 | depfile = argv[1]; |
| 426 | target = argv[2]; |
| 427 | cmdline = argv[3]; |
| 428 | |
| 429 | print_cmdline(); |
| 430 | print_deps(); |
| 431 | |
| 432 | return 0; |
| 433 | } |