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