git.ozlabs.org Git - ccan/blob - tools/configurator/configurator.c

   1 /* Simple tool to create config.h.
   2  * Would be much easier with ccan modules, but deliberately standalone.
   3  *
   4  * Copyright 2011 Rusty Russell <rusty@rustcorp.com.au>.  MIT license.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  19  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24 #include <stdio.h>
  25 #include <stdbool.h>
  26 #include <stdlib.h>
  27 #include <unistd.h>
  28 #include <err.h>
  29 #include <sys/types.h>
  30 #include <sys/wait.h>
  31 #include <sys/stat.h>
  32 #include <fcntl.h>
  33 #include <string.h>
  34
  35 #define DEFAULT_COMPILER "cc"
  36 #define DEFAULT_FLAGS "-g3 -ggdb -Wall -Wundef -Wmissing-prototypes -Wmissing-declarations -Wstrict-prototypes -Wold-style-definition"
  37
  38 #define OUTPUT_FILE "configurator.out"
  39 #define INPUT_FILE "configuratortest.c"
  40
  41 static int verbose;
  42
  43 enum test_style {
  44         OUTSIDE_MAIN            = 0x1,
  45         DEFINES_FUNC            = 0x2,
  46         INSIDE_MAIN             = 0x4,
  47         DEFINES_EVERYTHING      = 0x8,
  48         MAY_NOT_COMPILE         = 0x10,
  49         EXECUTE                 = 0x8000
  50 };
  51
  52 struct test {
  53         const char *name;
  54         enum test_style style;
  55         const char *depends;
  56         const char *link;
  57         const char *fragment;
  58         const char *overrides; /* On success, force this to '1' */
  59         bool done;
  60         bool answer;
  61 };
  62
  63 static struct test tests[] = {
  64         { "HAVE_32BIT_OFF_T", DEFINES_EVERYTHING|EXECUTE, NULL, NULL,
  65           "#include <sys/types.h>\n"
  66           "int main(int argc, char *argv[]) {\n"
  67           "     return sizeof(off_t) == 4 ? 0 : 1;\n"
  68           "}\n" },
  69         { "HAVE_ALIGNOF", INSIDE_MAIN, NULL, NULL,
  70           "return __alignof__(double) > 0 ? 0 : 1;" },
  71         { "HAVE_ASPRINTF", DEFINES_FUNC, NULL, NULL,
  72           "#define _GNU_SOURCE\n"
  73           "#include <stdio.h>\n"
  74           "static char *func(int x) {"
  75           "     char *p;\n"
  76           "     if (asprintf(&p, \"%u\", x) == -1) p = NULL;"
  77           "     return p;\n"
  78           "}" },
  79         { "HAVE_ATTRIBUTE_COLD", DEFINES_FUNC, NULL, NULL,
  80           "static int __attribute__((cold)) func(int x) { return x; }" },
  81         { "HAVE_ATTRIBUTE_CONST", DEFINES_FUNC, NULL, NULL,
  82           "static int __attribute__((const)) func(int x) { return x; }" },
  83         { "HAVE_ATTRIBUTE_PURE", DEFINES_FUNC, NULL, NULL,
  84           "static int __attribute__((pure)) func(int x) { return x; }" },
  85         { "HAVE_ATTRIBUTE_MAY_ALIAS", OUTSIDE_MAIN, NULL, NULL,
  86           "typedef short __attribute__((__may_alias__)) short_a;" },
  87         { "HAVE_ATTRIBUTE_NORETURN", DEFINES_FUNC, NULL, NULL,
  88           "#include <stdlib.h>\n"
  89           "static void __attribute__((noreturn)) func(int x) { exit(x); }" },
  90         { "HAVE_ATTRIBUTE_PRINTF", DEFINES_FUNC, NULL, NULL,
  91           "static void __attribute__((format(__printf__, 1, 2))) func(const char *fmt, ...) { }" },
  92         { "HAVE_ATTRIBUTE_UNUSED", OUTSIDE_MAIN, NULL, NULL,
  93           "static int __attribute__((unused)) func(int x) { return x; }" },
  94         { "HAVE_ATTRIBUTE_USED", OUTSIDE_MAIN, NULL, NULL,
  95           "static int __attribute__((used)) func(int x) { return x; }" },
  96         { "HAVE_BACKTRACE", DEFINES_FUNC, NULL, NULL,
  97           "#include <execinfo.h>\n"
  98           "static int func(int x) {"
  99           "     void *bt[10];\n"
 100           "     return backtrace(bt, 10) < x;\n"
 101           "}" },
 102         { "HAVE_BIG_ENDIAN", INSIDE_MAIN|EXECUTE, NULL, NULL,
 103           "union { int i; char c[sizeof(int)]; } u;\n"
 104           "u.i = 0x01020304;\n"
 105           "return u.c[0] == 0x01 && u.c[1] == 0x02 && u.c[2] == 0x03 && u.c[3] == 0x04 ? 0 : 1;" },
 106         { "HAVE_BSWAP_64", DEFINES_FUNC, "HAVE_BYTESWAP_H", NULL,
 107           "#include <byteswap.h>\n"
 108           "static int func(int x) { return bswap_64(x); }" },
 109         { "HAVE_BUILTIN_CHOOSE_EXPR", INSIDE_MAIN, NULL, NULL,
 110           "return __builtin_choose_expr(1, 0, \"garbage\");" },
 111         { "HAVE_BUILTIN_CLZ", INSIDE_MAIN, NULL, NULL,
 112           "return __builtin_clz(1) == (sizeof(int)*8 - 1) ? 0 : 1;" },
 113         { "HAVE_BUILTIN_CLZL", INSIDE_MAIN, NULL, NULL,
 114           "return __builtin_clzl(1) == (sizeof(long)*8 - 1) ? 0 : 1;" },
 115         { "HAVE_BUILTIN_CLZLL", INSIDE_MAIN, NULL, NULL,
 116           "return __builtin_clzll(1) == (sizeof(long long)*8 - 1) ? 0 : 1;" },
 117         { "HAVE_BUILTIN_CONSTANT_P", INSIDE_MAIN, NULL, NULL,
 118           "return __builtin_constant_p(1) ? 0 : 1;" },
 119         { "HAVE_BUILTIN_EXPECT", INSIDE_MAIN, NULL, NULL,
 120           "return __builtin_expect(argc == 1, 1) ? 0 : 1;" },
 121         { "HAVE_BUILTIN_FFSL", INSIDE_MAIN, NULL, NULL,
 122           "return __builtin_ffsl(0L) == 0 ? 0 : 1;" },
 123         { "HAVE_BUILTIN_FFSLL", INSIDE_MAIN, NULL, NULL,
 124           "return __builtin_ffsll(0LL) == 0 ? 0 : 1;" },
 125         { "HAVE_BUILTIN_POPCOUNTL", INSIDE_MAIN, NULL, NULL,
 126           "return __builtin_popcountl(255L) == 8 ? 0 : 1;" },
 127         { "HAVE_BUILTIN_TYPES_COMPATIBLE_P", INSIDE_MAIN, NULL, NULL,
 128           "return __builtin_types_compatible_p(char *, int) ? 1 : 0;" },
 129         { "HAVE_BYTESWAP_H", OUTSIDE_MAIN, NULL, NULL,
 130           "#include <byteswap.h>\n" },
 131         { "HAVE_CLOCK_GETTIME",
 132           DEFINES_FUNC, "HAVE_STRUCT_TIMESPEC", NULL,
 133           "#include <time.h>\n"
 134           "static struct timespec func(void) {\n"
 135           "     struct timespec ts;\n"
 136           "     clock_gettime(CLOCK_REALTIME, &ts);\n"
 137           "     return ts;\n"
 138           "}\n" },
 139         { "HAVE_CLOCK_GETTIME_IN_LIBRT",
 140           DEFINES_FUNC,
 141           "HAVE_STRUCT_TIMESPEC !HAVE_CLOCK_GETTIME",
 142           "-lrt",
 143           "#include <time.h>\n"
 144           "static struct timespec func(void) {\n"
 145           "     struct timespec ts;\n"
 146           "     clock_gettime(CLOCK_REALTIME, &ts);\n"
 147           "     return ts;\n"
 148           "}\n",
 149           /* This means HAVE_CLOCK_GETTIME, too */
 150           "HAVE_CLOCK_GETTIME" },
 151         { "HAVE_COMPOUND_LITERALS", INSIDE_MAIN, NULL, NULL,
 152           "int *foo = (int[]) { 1, 2, 3, 4 };\n"
 153           "return foo[0] ? 0 : 1;" },
 154         { "HAVE_FCHDIR", DEFINES_EVERYTHING|EXECUTE, NULL, NULL,
 155           "#include <sys/types.h>\n"
 156           "#include <sys/stat.h>\n"
 157           "#include <fcntl.h>\n"
 158           "#include <unistd.h>\n"
 159           "int main(void) {\n"
 160           "     int fd = open(\"..\", O_RDONLY);\n"
 161           "     return fchdir(fd) == 0 ? 0 : 1;\n"
 162           "}\n" },
 163         { "HAVE_ERR_H", DEFINES_FUNC, NULL, NULL,
 164           "#include <err.h>\n"
 165           "static void func(int arg) {\n"
 166           "     if (arg == 0)\n"
 167           "             err(1, \"err %u\", arg);\n"
 168           "     if (arg == 1)\n"
 169           "             errx(1, \"err %u\", arg);\n"
 170           "     if (arg == 3)\n"
 171           "             warn(\"warn %u\", arg);\n"
 172           "     if (arg == 4)\n"
 173           "             warnx(\"warn %u\", arg);\n"
 174           "}\n" },
 175         { "HAVE_FILE_OFFSET_BITS", DEFINES_EVERYTHING|EXECUTE,
 176           "HAVE_32BIT_OFF_T", NULL,
 177           "#define _FILE_OFFSET_BITS 64\n"
 178           "#include <sys/types.h>\n"
 179           "int main(int argc, char *argv[]) {\n"
 180           "     return sizeof(off_t) == 8 ? 0 : 1;\n"
 181           "}\n" },
 182         { "HAVE_FOR_LOOP_DECLARATION", INSIDE_MAIN, NULL, NULL,
 183           "for (int i = 0; i < argc; i++) { return 0; };\n"
 184           "return 1;" },
 185         { "HAVE_FLEXIBLE_ARRAY_MEMBER", OUTSIDE_MAIN, NULL, NULL,
 186           "struct foo { unsigned int x; int arr[]; };" },
 187         { "HAVE_GETPAGESIZE", DEFINES_FUNC, NULL, NULL,
 188           "#include <unistd.h>\n"
 189           "static int func(void) { return getpagesize(); }" },
 190         { "HAVE_ISBLANK", DEFINES_FUNC, NULL, NULL,
 191           "#define _GNU_SOURCE\n"
 192           "#include <ctype.h>\n"
 193           "static int func(void) { return isblank(' '); }" },
 194         { "HAVE_LITTLE_ENDIAN", INSIDE_MAIN|EXECUTE, NULL, NULL,
 195           "union { int i; char c[sizeof(int)]; } u;\n"
 196           "u.i = 0x01020304;\n"
 197           "return u.c[0] == 0x04 && u.c[1] == 0x03 && u.c[2] == 0x02 && u.c[3] == 0x01 ? 0 : 1;" },
 198         { "HAVE_MEMMEM", DEFINES_FUNC, NULL, NULL,
 199           "#define _GNU_SOURCE\n"
 200           "#include <string.h>\n"
 201           "static void *func(void *h, size_t hl, void *n, size_t nl) {\n"
 202           "return memmem(h, hl, n, nl);"
 203           "}\n", },
 204         { "HAVE_MMAP", DEFINES_FUNC, NULL, NULL,
 205           "#include <sys/mman.h>\n"
 206           "static void *func(int fd) {\n"
 207           "     return mmap(0, 65536, PROT_READ, MAP_SHARED, fd, 0);\n"
 208           "}" },
 209         { "HAVE_PROC_SELF_MAPS", DEFINES_EVERYTHING|EXECUTE, NULL, NULL,
 210           "#include <sys/types.h>\n"
 211           "#include <sys/stat.h>\n"
 212           "#include <fcntl.h>\n"
 213           "int main(void) {\n"
 214           "     return open(\"/proc/self/maps\", O_RDONLY) != -1 ? 0 : 1;\n"
 215           "}\n" },
 216         { "HAVE_QSORT_R_PRIVATE_LAST",
 217           DEFINES_EVERYTHING|EXECUTE|MAY_NOT_COMPILE, NULL, NULL,
 218           "#define _GNU_SOURCE 1\n"
 219           "#include <stdlib.h>\n"
 220           "static int cmp(const void *lp, const void *rp, void *priv) {\n"
 221           " *(unsigned int *)priv = 1;\n"
 222           " return *(const int *)lp - *(const int *)rp; }\n"
 223           "int main(void) {\n"
 224           " int array[] = { 9, 2, 5 };\n"
 225           " unsigned int called = 0;\n"
 226           " qsort_r(array, 3, sizeof(int), cmp, &called);\n"
 227           " return called && array[0] == 2 && array[1] == 5 && array[2] == 9 ? 0 : 1;\n"
 228           "}\n" },
 229         { "HAVE_STRUCT_TIMESPEC",
 230           DEFINES_FUNC, NULL, NULL,
 231           "#include <time.h>\n"
 232           "static void func(void) {\n"
 233           "     struct timespec ts;\n"
 234           "     ts.tv_sec = ts.tv_nsec = 1;\n"
 235           "}\n" },
 236         { "HAVE_SECTION_START_STOP",
 237           DEFINES_FUNC, NULL, NULL,
 238           "static void *__attribute__((__section__(\"mysec\"))) p = &p;\n"
 239           "static int func(void) {\n"
 240           "     extern void *__start_mysec[], *__stop_mysec[];\n"
 241           "     return __stop_mysec - __start_mysec;\n"
 242           "}\n" },
 243         { "HAVE_STACK_GROWS_UPWARDS", DEFINES_EVERYTHING|EXECUTE, NULL, NULL,
 244           "static long nest(const void *base, unsigned int i)\n"
 245           "{\n"
 246           "     if (i == 0)\n"
 247           "             return (const char *)&i - (const char *)base;\n"
 248           "     return nest(base, i-1);\n"
 249           "}\n"
 250           "int main(int argc, char *argv[]) {\n"
 251           "     return (nest(&argc, argc) > 0) ? 0 : 1\n;"
 252           "}\n" },
 253         { "HAVE_STATEMENT_EXPR", INSIDE_MAIN, NULL, NULL,
 254           "return ({ int x = argc; x == argc ? 0 : 1; });" },
 255         { "HAVE_SYS_FILIO_H", OUTSIDE_MAIN, NULL, NULL, /* Solaris needs this for FIONREAD */
 256           "#include <sys/filio.h>\n" },
 257         { "HAVE_SYS_TERMIOS_H", OUTSIDE_MAIN, NULL, NULL,
 258           "#include <sys/termios.h>\n" },
 259         { "HAVE_TYPEOF", INSIDE_MAIN, NULL, NULL,
 260           "__typeof__(argc) i; i = argc; return i == argc ? 0 : 1;" },
 261         { "HAVE_UTIME", DEFINES_FUNC, NULL, NULL,
 262           "#include <sys/types.h>\n"
 263           "#include <utime.h>\n"
 264           "static int func(const char *filename) {\n"
 265           "     struct utimbuf times = { 0 };\n"
 266           "     return utime(filename, &times);\n"
 267           "}" },
 268         { "HAVE_WARN_UNUSED_RESULT", DEFINES_FUNC, NULL, NULL,
 269           "#include <sys/types.h>\n"
 270           "#include <utime.h>\n"
 271           "static __attribute__((warn_unused_result)) int func(int i) {\n"
 272           "     return i + 1;\n"
 273           "}" },
 274 };
 275
 276 static char *grab_fd(int fd)
 277 {
 278         int ret;
 279         size_t max, size = 0;
 280         char *buffer;
 281
 282         max = 16384;
 283         buffer = malloc(max+1);
 284         while ((ret = read(fd, buffer + size, max - size)) > 0) {
 285                 size += ret;
 286                 if (size == max)
 287                         buffer = realloc(buffer, max *= 2);
 288         }
 289         if (ret < 0)
 290                 err(1, "reading from command");
 291         buffer[size] = '\0';
 292         return buffer;
 293 }
 294
 295 static char *run(const char *cmd, int *exitstatus)
 296 {
 297         pid_t pid;
 298         int p[2];
 299         char *ret;
 300         int status;
 301
 302         if (pipe(p) != 0)
 303                 err(1, "creating pipe");
 304
 305         pid = fork();
 306         if (pid == -1)
 307                 err(1, "forking");
 308
 309         if (pid == 0) {
 310                 if (dup2(p[1], STDOUT_FILENO) != STDOUT_FILENO
 311                     || dup2(p[1], STDERR_FILENO) != STDERR_FILENO
 312                     || close(p[0]) != 0
 313                     || close(STDIN_FILENO) != 0
 314                     || open("/dev/null", O_RDONLY) != STDIN_FILENO)
 315                         exit(128);
 316
 317                 status = system(cmd);
 318                 if (WIFEXITED(status))
 319                         exit(WEXITSTATUS(status));
 320                 /* Here's a hint... */
 321                 exit(128 + WTERMSIG(status));
 322         }
 323
 324         close(p[1]);
 325         ret = grab_fd(p[0]);
 326         /* This shouldn't fail... */
 327         if (waitpid(pid, &status, 0) != pid)
 328                 err(1, "Failed to wait for child");
 329         close(p[0]);
 330         if (WIFEXITED(status))
 331                 *exitstatus = WEXITSTATUS(status);
 332         else
 333                 *exitstatus = -WTERMSIG(status);
 334         return ret;
 335 }
 336
 337 static char *connect_args(const char *argv[], const char *extra)
 338 {
 339         unsigned int i, len = strlen(extra) + 1;
 340         char *ret;
 341
 342         for (i = 1; argv[i]; i++)
 343                 len += 1 + strlen(argv[i]);
 344
 345         ret = malloc(len);
 346         len = 0;
 347         for (i = 1; argv[i]; i++) {
 348                 strcpy(ret + len, argv[i]);
 349                 len += strlen(argv[i]);
 350                 if (argv[i+1])
 351                         ret[len++] = ' ';
 352         }
 353         strcpy(ret + len, extra);
 354         return ret;
 355 }
 356
 357 static struct test *find_test(const char *name)
 358 {
 359         unsigned int i;
 360
 361         for (i = 0; i < sizeof(tests)/sizeof(tests[0]); i++) {
 362                 if (strcmp(tests[i].name, name) == 0)
 363                         return &tests[i];
 364         }
 365         abort();
 366 }
 367
 368 #define PRE_BOILERPLATE "/* Test program generated by configurator. */\n"
 369 #define MAIN_START_BOILERPLATE "int main(int argc, char *argv[]) {\n"
 370 #define USE_FUNC_BOILERPLATE "(void)func;\n"
 371 #define MAIN_BODY_BOILERPLATE "return 0;\n"
 372 #define MAIN_END_BOILERPLATE "}\n"
 373
 374 static bool run_test(const char *cmd, struct test *test)
 375 {
 376         char *output;
 377         FILE *outf;
 378         int status;
 379
 380         if (test->done)
 381                 return test->answer;
 382
 383         if (test->depends) {
 384                 size_t len;
 385                 const char *deps = test->depends;
 386                 char *dep;
 387
 388                 /* Space-separated dependencies, could be ! for inverse. */
 389                 while ((len = strcspn(deps, " "))) {
 390                         bool positive = true;
 391                         if (deps[len]) {
 392                                 dep = strdup(deps);
 393                                 dep[len] = '\0';
 394                         } else {
 395                                 dep = (char *)deps;
 396                         }
 397
 398                         if (dep[0] == '!') {
 399                                 dep++;
 400                                 positive = false;
 401                         }
 402                         if (run_test(cmd, find_test(dep)) != positive) {
 403                                 test->answer = false;
 404                                 test->done = true;
 405                                 return test->answer;
 406                         }
 407                         deps += len;
 408                         deps += strspn(deps, " ");
 409                 }
 410         }
 411
 412         outf = fopen(INPUT_FILE, "w");
 413         if (!outf)
 414                 err(1, "creating %s", INPUT_FILE);
 415
 416         fprintf(outf, "%s", PRE_BOILERPLATE);
 417         switch (test->style & ~(EXECUTE|MAY_NOT_COMPILE)) {
 418         case INSIDE_MAIN:
 419                 fprintf(outf, "%s", MAIN_START_BOILERPLATE);
 420                 fprintf(outf, "%s", test->fragment);
 421                 fprintf(outf, "%s", MAIN_END_BOILERPLATE);
 422                 break;
 423         case OUTSIDE_MAIN:
 424                 fprintf(outf, "%s", test->fragment);
 425                 fprintf(outf, "%s", MAIN_START_BOILERPLATE);
 426                 fprintf(outf, "%s", MAIN_BODY_BOILERPLATE);
 427                 fprintf(outf, "%s", MAIN_END_BOILERPLATE);
 428                 break;
 429         case DEFINES_FUNC:
 430                 fprintf(outf, "%s", test->fragment);
 431                 fprintf(outf, "%s", MAIN_START_BOILERPLATE);
 432                 fprintf(outf, "%s", USE_FUNC_BOILERPLATE);
 433                 fprintf(outf, "%s", MAIN_BODY_BOILERPLATE);
 434                 fprintf(outf, "%s", MAIN_END_BOILERPLATE);
 435                 break;
 436         case DEFINES_EVERYTHING:
 437                 fprintf(outf, "%s", test->fragment);
 438                 break;
 439         default:
 440                 abort();
 441
 442         }
 443         fclose(outf);
 444
 445         if (verbose > 1)
 446                 if (system("cat " INPUT_FILE) == -1);
 447
 448         if (test->link) {
 449                 char *newcmd;
 450                 newcmd = malloc(strlen(cmd) + strlen(" ")
 451                                 + strlen(test->link) + 1);
 452                 sprintf(newcmd, "%s %s", cmd, test->link);
 453                 if (verbose > 1)
 454                         printf("Extra link line: %s", newcmd);
 455                 cmd = newcmd;
 456         }
 457
 458         output = run(cmd, &status);
 459         if (status != 0 || strstr(output, "warning")) {
 460                 if (verbose)
 461                         printf("Compile %s for %s, status %i: %s\n",
 462                                status ? "fail" : "warning",
 463                                test->name, status, output);
 464                 if ((test->style & EXECUTE) && !(test->style & MAY_NOT_COMPILE))
 465                         errx(1, "Test for %s did not compile:\n%s",
 466                              test->name, output);
 467                 test->answer = false;
 468                 free(output);
 469         } else {
 470                 /* Compile succeeded. */
 471                 free(output);
 472                 /* We run INSIDE_MAIN tests for sanity checking. */
 473                 if ((test->style & EXECUTE) || (test->style & INSIDE_MAIN)) {
 474                         output = run("./" OUTPUT_FILE, &status);
 475                         if (!(test->style & EXECUTE) && status != 0)
 476                                 errx(1, "Test for %s failed with %i:\n%s",
 477                                      test->name, status, output);
 478                         if (verbose && status)
 479                                 printf("%s exited %i\n", test->name, status);
 480                         free(output);
 481                 }
 482                 test->answer = (status == 0);
 483         }
 484         test->done = true;
 485
 486         if (test->answer && test->overrides) {
 487                 struct test *override = find_test(test->overrides);
 488                 override->done = true;
 489                 override->answer = true;
 490         }
 491         return test->answer;
 492 }
 493
 494 int main(int argc, const char *argv[])
 495 {
 496         char *cmd;
 497         unsigned int i;
 498         const char *default_args[]
 499                 = { "", DEFAULT_COMPILER, DEFAULT_FLAGS, NULL };
 500
 501         if (argc > 1) {
 502                 if (strcmp(argv[1], "--help") == 0) {
 503                         printf("Usage: configurator [-v] [<compiler> <flags>...]\n"
 504                                "  <compiler> <flags> will have \"-o <outfile> <infile.c>\" appended\n"
 505                                "Default: %s %s\n",
 506                                DEFAULT_COMPILER, DEFAULT_FLAGS);
 507                         exit(0);
 508                 }
 509                 if (strcmp(argv[1], "-v") == 0) {
 510                         argc--;
 511                         argv++;
 512                         verbose = 1;
 513                 } else if (strcmp(argv[1], "-vv") == 0) {
 514                         argc--;
 515                         argv++;
 516                         verbose = 2;
 517                 }
 518         }
 519
 520         if (argc == 1)
 521                 argv = default_args;
 522
 523         cmd = connect_args(argv, " -o " OUTPUT_FILE " " INPUT_FILE);
 524         for (i = 0; i < sizeof(tests)/sizeof(tests[0]); i++)
 525                 run_test(cmd, &tests[i]);
 526
 527         unlink(OUTPUT_FILE);
 528         unlink(INPUT_FILE);
 529
 530         printf("/* Generated by CCAN configurator */\n"
 531                "#ifndef CCAN_CONFIG_H\n"
 532                "#define CCAN_CONFIG_H\n");
 533         printf("#ifndef _GNU_SOURCE\n");
 534         printf("#define _GNU_SOURCE /* Always use GNU extensions. */\n");
 535         printf("#endif\n");
 536         printf("#define CCAN_COMPILER \"%s\"\n", argv[1]);
 537         printf("#define CCAN_CFLAGS \"%s\"\n\n", connect_args(argv+1, ""));
 538         /* This one implies "#include <ccan/..." works, eg. for tdb2.h */
 539         printf("#define HAVE_CCAN 1\n");
 540         for (i = 0; i < sizeof(tests)/sizeof(tests[0]); i++)
 541                 printf("#define %s %u\n", tests[i].name, tests[i].answer);
 542         printf("#endif /* CCAN_CONFIG_H */\n");
 543         return 0;
 544 }