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