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_CTZ", INSIDE_MAIN, NULL, NULL,
 118           "return __builtin_ctz(1 << (sizeof(int)*8 - 1)) == (sizeof(int)*8 - 1) ? 0 : 1;" },
 119         { "HAVE_BUILTIN_CTZL", INSIDE_MAIN, NULL, NULL,
 120           "return __builtin_ctzl(1UL << (sizeof(long)*8 - 1)) == (sizeof(long)*8 - 1) ? 0 : 1;" },
 121         { "HAVE_BUILTIN_CTZLL", INSIDE_MAIN, NULL, NULL,
 122           "return __builtin_ctzll(1ULL << (sizeof(long long)*8 - 1)) == (sizeof(long long)*8 - 1) ? 0 : 1;" },
 123         { "HAVE_BUILTIN_CONSTANT_P", INSIDE_MAIN, NULL, NULL,
 124           "return __builtin_constant_p(1) ? 0 : 1;" },
 125         { "HAVE_BUILTIN_EXPECT", INSIDE_MAIN, NULL, NULL,
 126           "return __builtin_expect(argc == 1, 1) ? 0 : 1;" },
 127         { "HAVE_BUILTIN_FFS", INSIDE_MAIN, NULL, NULL,
 128           "return __builtin_ffs(0) == 0 ? 0 : 1;" },
 129         { "HAVE_BUILTIN_FFSL", INSIDE_MAIN, NULL, NULL,
 130           "return __builtin_ffsl(0L) == 0 ? 0 : 1;" },
 131         { "HAVE_BUILTIN_FFSLL", INSIDE_MAIN, NULL, NULL,
 132           "return __builtin_ffsll(0LL) == 0 ? 0 : 1;" },
 133         { "HAVE_BUILTIN_POPCOUNTL", INSIDE_MAIN, NULL, NULL,
 134           "return __builtin_popcountl(255L) == 8 ? 0 : 1;" },
 135         { "HAVE_BUILTIN_TYPES_COMPATIBLE_P", INSIDE_MAIN, NULL, NULL,
 136           "return __builtin_types_compatible_p(char *, int) ? 1 : 0;" },
 137         { "HAVE_ICCARM_INTRINSICS", DEFINES_FUNC, NULL, NULL,
 138           "#include <intrinsics.h>\n"
 139           "int func(int v) {\n"
 140           "     return __CLZ(__RBIT(v));\n"
 141           "}" },
 142         { "HAVE_BYTESWAP_H", OUTSIDE_MAIN, NULL, NULL,
 143           "#include <byteswap.h>\n" },
 144         { "HAVE_CLOCK_GETTIME",
 145           DEFINES_FUNC, "HAVE_STRUCT_TIMESPEC", NULL,
 146           "#include <time.h>\n"
 147           "static struct timespec func(void) {\n"
 148           "     struct timespec ts;\n"
 149           "     clock_gettime(CLOCK_REALTIME, &ts);\n"
 150           "     return ts;\n"
 151           "}\n" },
 152         { "HAVE_CLOCK_GETTIME_IN_LIBRT",
 153           DEFINES_FUNC,
 154           "HAVE_STRUCT_TIMESPEC !HAVE_CLOCK_GETTIME",
 155           "-lrt",
 156           "#include <time.h>\n"
 157           "static struct timespec func(void) {\n"
 158           "     struct timespec ts;\n"
 159           "     clock_gettime(CLOCK_REALTIME, &ts);\n"
 160           "     return ts;\n"
 161           "}\n",
 162           /* This means HAVE_CLOCK_GETTIME, too */
 163           "HAVE_CLOCK_GETTIME" },
 164         { "HAVE_COMPOUND_LITERALS", INSIDE_MAIN, NULL, NULL,
 165           "int *foo = (int[]) { 1, 2, 3, 4 };\n"
 166           "return foo[0] ? 0 : 1;" },
 167         { "HAVE_FCHDIR", DEFINES_EVERYTHING|EXECUTE, NULL, NULL,
 168           "#include <sys/types.h>\n"
 169           "#include <sys/stat.h>\n"
 170           "#include <fcntl.h>\n"
 171           "#include <unistd.h>\n"
 172           "int main(void) {\n"
 173           "     int fd = open(\"..\", O_RDONLY);\n"
 174           "     return fchdir(fd) == 0 ? 0 : 1;\n"
 175           "}\n" },
 176         { "HAVE_ERR_H", DEFINES_FUNC, NULL, NULL,
 177           "#include <err.h>\n"
 178           "static void func(int arg) {\n"
 179           "     if (arg == 0)\n"
 180           "             err(1, \"err %u\", arg);\n"
 181           "     if (arg == 1)\n"
 182           "             errx(1, \"err %u\", arg);\n"
 183           "     if (arg == 3)\n"
 184           "             warn(\"warn %u\", arg);\n"
 185           "     if (arg == 4)\n"
 186           "             warnx(\"warn %u\", arg);\n"
 187           "}\n" },
 188         { "HAVE_FILE_OFFSET_BITS", DEFINES_EVERYTHING|EXECUTE,
 189           "HAVE_32BIT_OFF_T", NULL,
 190           "#define _FILE_OFFSET_BITS 64\n"
 191           "#include <sys/types.h>\n"
 192           "int main(int argc, char *argv[]) {\n"
 193           "     return sizeof(off_t) == 8 ? 0 : 1;\n"
 194           "}\n" },
 195         { "HAVE_FOR_LOOP_DECLARATION", INSIDE_MAIN, NULL, NULL,
 196           "for (int i = 0; i < argc; i++) { return 0; };\n"
 197           "return 1;" },
 198         { "HAVE_FLEXIBLE_ARRAY_MEMBER", OUTSIDE_MAIN, NULL, NULL,
 199           "struct foo { unsigned int x; int arr[]; };" },
 200         { "HAVE_GETPAGESIZE", DEFINES_FUNC, NULL, NULL,
 201           "#include <unistd.h>\n"
 202           "static int func(void) { return getpagesize(); }" },
 203         { "HAVE_ISBLANK", DEFINES_FUNC, NULL, NULL,
 204           "#define _GNU_SOURCE\n"
 205           "#include <ctype.h>\n"
 206           "static int func(void) { return isblank(' '); }" },
 207         { "HAVE_LITTLE_ENDIAN", INSIDE_MAIN|EXECUTE, NULL, NULL,
 208           "union { int i; char c[sizeof(int)]; } u;\n"
 209           "u.i = 0x01020304;\n"
 210           "return u.c[0] == 0x04 && u.c[1] == 0x03 && u.c[2] == 0x02 && u.c[3] == 0x01 ? 0 : 1;" },
 211         { "HAVE_MEMMEM", DEFINES_FUNC, NULL, NULL,
 212           "#define _GNU_SOURCE\n"
 213           "#include <string.h>\n"
 214           "static void *func(void *h, size_t hl, void *n, size_t nl) {\n"
 215           "return memmem(h, hl, n, nl);"
 216           "}\n", },
 217         { "HAVE_MEMRCHR", DEFINES_FUNC, NULL, NULL,
 218           "#define _GNU_SOURCE\n"
 219           "#include <string.h>\n"
 220           "static void *func(void *s, int c, size_t n) {\n"
 221           "return memrchr(s, c, n);"
 222           "}\n", },
 223         { "HAVE_MMAP", DEFINES_FUNC, NULL, NULL,
 224           "#include <sys/mman.h>\n"
 225           "static void *func(int fd) {\n"
 226           "     return mmap(0, 65536, PROT_READ, MAP_SHARED, fd, 0);\n"
 227           "}" },
 228         { "HAVE_PROC_SELF_MAPS", DEFINES_EVERYTHING|EXECUTE, NULL, NULL,
 229           "#include <sys/types.h>\n"
 230           "#include <sys/stat.h>\n"
 231           "#include <fcntl.h>\n"
 232           "int main(void) {\n"
 233           "     return open(\"/proc/self/maps\", O_RDONLY) != -1 ? 0 : 1;\n"
 234           "}\n" },
 235         { "HAVE_QSORT_R_PRIVATE_LAST",
 236           DEFINES_EVERYTHING|EXECUTE|MAY_NOT_COMPILE, NULL, NULL,
 237           "#define _GNU_SOURCE 1\n"
 238           "#include <stdlib.h>\n"
 239           "static int cmp(const void *lp, const void *rp, void *priv) {\n"
 240           " *(unsigned int *)priv = 1;\n"
 241           " return *(const int *)lp - *(const int *)rp; }\n"
 242           "int main(void) {\n"
 243           " int array[] = { 9, 2, 5 };\n"
 244           " unsigned int called = 0;\n"
 245           " qsort_r(array, 3, sizeof(int), cmp, &called);\n"
 246           " return called && array[0] == 2 && array[1] == 5 && array[2] == 9 ? 0 : 1;\n"
 247           "}\n" },
 248         { "HAVE_STRUCT_TIMESPEC",
 249           DEFINES_FUNC, NULL, NULL,
 250           "#include <time.h>\n"
 251           "static void func(void) {\n"
 252           "     struct timespec ts;\n"
 253           "     ts.tv_sec = ts.tv_nsec = 1;\n"
 254           "}\n" },
 255         { "HAVE_SECTION_START_STOP",
 256           DEFINES_FUNC, NULL, NULL,
 257           "static void *__attribute__((__section__(\"mysec\"))) p = &p;\n"
 258           "static int func(void) {\n"
 259           "     extern void *__start_mysec[], *__stop_mysec[];\n"
 260           "     return __stop_mysec - __start_mysec;\n"
 261           "}\n" },
 262         { "HAVE_STACK_GROWS_UPWARDS", DEFINES_EVERYTHING|EXECUTE, NULL, NULL,
 263           "static long nest(const void *base, unsigned int i)\n"
 264           "{\n"
 265           "     if (i == 0)\n"
 266           "             return (const char *)&i - (const char *)base;\n"
 267           "     return nest(base, i-1);\n"
 268           "}\n"
 269           "int main(int argc, char *argv[]) {\n"
 270           "     return (nest(&argc, argc) > 0) ? 0 : 1\n;"
 271           "}\n" },
 272         { "HAVE_STATEMENT_EXPR", INSIDE_MAIN, NULL, NULL,
 273           "return ({ int x = argc; x == argc ? 0 : 1; });" },
 274         { "HAVE_SYS_FILIO_H", OUTSIDE_MAIN, NULL, NULL, /* Solaris needs this for FIONREAD */
 275           "#include <sys/filio.h>\n" },
 276         { "HAVE_SYS_TERMIOS_H", OUTSIDE_MAIN, NULL, NULL,
 277           "#include <sys/termios.h>\n" },
 278         { "HAVE_TYPEOF", INSIDE_MAIN, NULL, NULL,
 279           "__typeof__(argc) i; i = argc; return i == argc ? 0 : 1;" },
 280         { "HAVE_UNALIGNED_ACCESS", DEFINES_EVERYTHING|EXECUTE, NULL, NULL,
 281           "#include <string.h>\n"
 282           "int main(int argc, char *argv[]) {\n"
 283           "     char pad[sizeof(int *) * 1];\n"
 284           "     strncpy(pad, argv[0], sizeof(pad));\n"
 285           "     int *x = (int *)pad, *y = (int *)(pad + 1);\n"
 286           "     return *x == *y;\n"
 287           "}\n" },
 288         { "HAVE_UTIME", DEFINES_FUNC, NULL, NULL,
 289           "#include <sys/types.h>\n"
 290           "#include <utime.h>\n"
 291           "static int func(const char *filename) {\n"
 292           "     struct utimbuf times = { 0 };\n"
 293           "     return utime(filename, &times);\n"
 294           "}" },
 295         { "HAVE_WARN_UNUSED_RESULT", DEFINES_FUNC, NULL, NULL,
 296           "#include <sys/types.h>\n"
 297           "#include <utime.h>\n"
 298           "static __attribute__((warn_unused_result)) int func(int i) {\n"
 299           "     return i + 1;\n"
 300           "}" },
 301 };
 302
 303 static char *grab_fd(int fd)
 304 {
 305         int ret;
 306         size_t max, size = 0;
 307         char *buffer;
 308
 309         max = 16384;
 310         buffer = malloc(max+1);
 311         while ((ret = read(fd, buffer + size, max - size)) > 0) {
 312                 size += ret;
 313                 if (size == max)
 314                         buffer = realloc(buffer, max *= 2);
 315         }
 316         if (ret < 0)
 317                 err(1, "reading from command");
 318         buffer[size] = '\0';
 319         return buffer;
 320 }
 321
 322 static char *run(const char *cmd, int *exitstatus)
 323 {
 324         pid_t pid;
 325         int p[2];
 326         char *ret;
 327         int status;
 328
 329         if (pipe(p) != 0)
 330                 err(1, "creating pipe");
 331
 332         pid = fork();
 333         if (pid == -1)
 334                 err(1, "forking");
 335
 336         if (pid == 0) {
 337                 if (dup2(p[1], STDOUT_FILENO) != STDOUT_FILENO
 338                     || dup2(p[1], STDERR_FILENO) != STDERR_FILENO
 339                     || close(p[0]) != 0
 340                     || close(STDIN_FILENO) != 0
 341                     || open("/dev/null", O_RDONLY) != STDIN_FILENO)
 342                         exit(128);
 343
 344                 status = system(cmd);
 345                 if (WIFEXITED(status))
 346                         exit(WEXITSTATUS(status));
 347                 /* Here's a hint... */
 348                 exit(128 + WTERMSIG(status));
 349         }
 350
 351         close(p[1]);
 352         ret = grab_fd(p[0]);
 353         /* This shouldn't fail... */
 354         if (waitpid(pid, &status, 0) != pid)
 355                 err(1, "Failed to wait for child");
 356         close(p[0]);
 357         if (WIFEXITED(status))
 358                 *exitstatus = WEXITSTATUS(status);
 359         else
 360                 *exitstatus = -WTERMSIG(status);
 361         return ret;
 362 }
 363
 364 static char *connect_args(const char *argv[], const char *extra)
 365 {
 366         unsigned int i, len = strlen(extra) + 1;
 367         char *ret;
 368
 369         for (i = 1; argv[i]; i++)
 370                 len += 1 + strlen(argv[i]);
 371
 372         ret = malloc(len);
 373         len = 0;
 374         for (i = 1; argv[i]; i++) {
 375                 strcpy(ret + len, argv[i]);
 376                 len += strlen(argv[i]);
 377                 if (argv[i+1])
 378                         ret[len++] = ' ';
 379         }
 380         strcpy(ret + len, extra);
 381         return ret;
 382 }
 383
 384 static struct test *find_test(const char *name)
 385 {
 386         unsigned int i;
 387
 388         for (i = 0; i < sizeof(tests)/sizeof(tests[0]); i++) {
 389                 if (strcmp(tests[i].name, name) == 0)
 390                         return &tests[i];
 391         }
 392         abort();
 393 }
 394
 395 #define PRE_BOILERPLATE "/* Test program generated by configurator. */\n"
 396 #define MAIN_START_BOILERPLATE "int main(int argc, char *argv[]) {\n"
 397 #define USE_FUNC_BOILERPLATE "(void)func;\n"
 398 #define MAIN_BODY_BOILERPLATE "return 0;\n"
 399 #define MAIN_END_BOILERPLATE "}\n"
 400
 401 static bool run_test(const char *cmd, struct test *test)
 402 {
 403         char *output;
 404         FILE *outf;
 405         int status;
 406
 407         if (test->done)
 408                 return test->answer;
 409
 410         if (test->depends) {
 411                 size_t len;
 412                 const char *deps = test->depends;
 413                 char *dep;
 414
 415                 /* Space-separated dependencies, could be ! for inverse. */
 416                 while ((len = strcspn(deps, " "))) {
 417                         bool positive = true;
 418                         if (deps[len]) {
 419                                 dep = strdup(deps);
 420                                 dep[len] = '\0';
 421                         } else {
 422                                 dep = (char *)deps;
 423                         }
 424
 425                         if (dep[0] == '!') {
 426                                 dep++;
 427                                 positive = false;
 428                         }
 429                         if (run_test(cmd, find_test(dep)) != positive) {
 430                                 test->answer = false;
 431                                 test->done = true;
 432                                 return test->answer;
 433                         }
 434                         if (deps[len])
 435                                 free(dep);
 436
 437                         deps += len;
 438                         deps += strspn(deps, " ");
 439                 }
 440         }
 441
 442         outf = fopen(INPUT_FILE, "w");
 443         if (!outf)
 444                 err(1, "creating %s", INPUT_FILE);
 445
 446         fprintf(outf, "%s", PRE_BOILERPLATE);
 447         switch (test->style & ~(EXECUTE|MAY_NOT_COMPILE)) {
 448         case INSIDE_MAIN:
 449                 fprintf(outf, "%s", MAIN_START_BOILERPLATE);
 450                 fprintf(outf, "%s", test->fragment);
 451                 fprintf(outf, "%s", MAIN_END_BOILERPLATE);
 452                 break;
 453         case OUTSIDE_MAIN:
 454                 fprintf(outf, "%s", test->fragment);
 455                 fprintf(outf, "%s", MAIN_START_BOILERPLATE);
 456                 fprintf(outf, "%s", MAIN_BODY_BOILERPLATE);
 457                 fprintf(outf, "%s", MAIN_END_BOILERPLATE);
 458                 break;
 459         case DEFINES_FUNC:
 460                 fprintf(outf, "%s", test->fragment);
 461                 fprintf(outf, "%s", MAIN_START_BOILERPLATE);
 462                 fprintf(outf, "%s", USE_FUNC_BOILERPLATE);
 463                 fprintf(outf, "%s", MAIN_BODY_BOILERPLATE);
 464                 fprintf(outf, "%s", MAIN_END_BOILERPLATE);
 465                 break;
 466         case DEFINES_EVERYTHING:
 467                 fprintf(outf, "%s", test->fragment);
 468                 break;
 469         default:
 470                 abort();
 471
 472         }
 473         fclose(outf);
 474
 475         if (verbose > 1)
 476                 if (system("cat " INPUT_FILE) == -1);
 477
 478         if (test->link) {
 479                 char *newcmd;
 480                 newcmd = malloc(strlen(cmd) + strlen(" ")
 481                                 + strlen(test->link) + 1);
 482                 sprintf(newcmd, "%s %s", cmd, test->link);
 483                 if (verbose > 1)
 484                         printf("Extra link line: %s", newcmd);
 485                 cmd = newcmd;
 486         }
 487
 488         output = run(cmd, &status);
 489         if (status != 0 || strstr(output, "warning")) {
 490                 if (verbose)
 491                         printf("Compile %s for %s, status %i: %s\n",
 492                                status ? "fail" : "warning",
 493                                test->name, status, output);
 494                 if ((test->style & EXECUTE) && !(test->style & MAY_NOT_COMPILE))
 495                         errx(1, "Test for %s did not compile:\n%s",
 496                              test->name, output);
 497                 test->answer = false;
 498                 free(output);
 499         } else {
 500                 /* Compile succeeded. */
 501                 free(output);
 502                 /* We run INSIDE_MAIN tests for sanity checking. */
 503                 if ((test->style & EXECUTE) || (test->style & INSIDE_MAIN)) {
 504                         output = run("./" OUTPUT_FILE, &status);
 505                         if (!(test->style & EXECUTE) && status != 0)
 506                                 errx(1, "Test for %s failed with %i:\n%s",
 507                                      test->name, status, output);
 508                         if (verbose && status)
 509                                 printf("%s exited %i\n", test->name, status);
 510                         free(output);
 511                 }
 512                 test->answer = (status == 0);
 513         }
 514         test->done = true;
 515
 516         if (test->answer && test->overrides) {
 517                 struct test *override = find_test(test->overrides);
 518                 override->done = true;
 519                 override->answer = true;
 520         }
 521         return test->answer;
 522 }
 523
 524 int main(int argc, const char *argv[])
 525 {
 526         char *cmd;
 527         unsigned int i;
 528         const char *default_args[]
 529                 = { "", DEFAULT_COMPILER, DEFAULT_FLAGS, NULL };
 530
 531         if (argc > 1) {
 532                 if (strcmp(argv[1], "--help") == 0) {
 533                         printf("Usage: configurator [-v] [<compiler> <flags>...]\n"
 534                                "  <compiler> <flags> will have \"-o <outfile> <infile.c>\" appended\n"
 535                                "Default: %s %s\n",
 536                                DEFAULT_COMPILER, DEFAULT_FLAGS);
 537                         exit(0);
 538                 }
 539                 if (strcmp(argv[1], "-v") == 0) {
 540                         argc--;
 541                         argv++;
 542                         verbose = 1;
 543                 } else if (strcmp(argv[1], "-vv") == 0) {
 544                         argc--;
 545                         argv++;
 546                         verbose = 2;
 547                 }
 548         }
 549
 550         if (argc == 1)
 551                 argv = default_args;
 552
 553         cmd = connect_args(argv, " -o " OUTPUT_FILE " " INPUT_FILE);
 554         for (i = 0; i < sizeof(tests)/sizeof(tests[0]); i++)
 555                 run_test(cmd, &tests[i]);
 556         free(cmd);
 557
 558         unlink(OUTPUT_FILE);
 559         unlink(INPUT_FILE);
 560
 561         printf("/* Generated by CCAN configurator */\n"
 562                "#ifndef CCAN_CONFIG_H\n"
 563                "#define CCAN_CONFIG_H\n");
 564         printf("#ifndef _GNU_SOURCE\n");
 565         printf("#define _GNU_SOURCE /* Always use GNU extensions. */\n");
 566         printf("#endif\n");
 567         printf("#define CCAN_COMPILER \"%s\"\n", argv[1]);
 568         cmd = connect_args(argv+1, "");
 569         printf("#define CCAN_CFLAGS \"%s\"\n\n", cmd);
 570         free(cmd);
 571         /* This one implies "#include <ccan/..." works, eg. for tdb2.h */
 572         printf("#define HAVE_CCAN 1\n");
 573         for (i = 0; i < sizeof(tests)/sizeof(tests[0]); i++)
 574                 printf("#define %s %u\n", tests[i].name, tests[i].answer);
 575         printf("#endif /* CCAN_CONFIG_H */\n");
 576         return 0;
 577 }