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 #define _POSIX_C_SOURCE 200809L                /* For pclose, popen, strdup */
  25
  26 #include <stdio.h>
  27 #include <stdbool.h>
  28 #include <stdlib.h>
  29 #include <err.h>
  30 #include <string.h>
  31
  32 #ifdef _MSC_VER
  33 #define popen _popen
  34 #define pclose _pclose
  35 #endif
  36
  37 #define DEFAULT_COMPILER "cc"
  38 #define DEFAULT_FLAGS "-g3 -ggdb -Wall -Wundef -Wmissing-prototypes -Wmissing-declarations -Wstrict-prototypes -Wold-style-definition"
  39
  40 #define OUTPUT_FILE "configurator.out"
  41 #define INPUT_FILE "configuratortest.c"
  42
  43 #ifdef _WIN32
  44 #define DIR_SEP   "\\"
  45 #else
  46 #define DIR_SEP   "/"
  47 #endif
  48
  49 static int verbose;
  50
  51 enum test_style {
  52         OUTSIDE_MAIN            = 0x1,
  53         DEFINES_FUNC            = 0x2,
  54         INSIDE_MAIN             = 0x4,
  55         DEFINES_EVERYTHING      = 0x8,
  56         MAY_NOT_COMPILE         = 0x10,
  57         EXECUTE                 = 0x8000
  58 };
  59
  60 struct test {
  61         const char *name;
  62         enum test_style style;
  63         const char *depends;
  64         const char *link;
  65         const char *fragment;
  66         const char *flags;
  67         const char *overrides; /* On success, force this to '1' */
  68         bool done;
  69         bool answer;
  70 };
  71
  72 static struct test tests[] = {
  73         { "HAVE_32BIT_OFF_T", DEFINES_EVERYTHING|EXECUTE|MAY_NOT_COMPILE, NULL, NULL,
  74           "#include <sys/types.h>\n"
  75           "int main(void) {\n"
  76           "     return sizeof(off_t) == 4 ? 0 : 1;\n"
  77           "}\n" },
  78         { "HAVE_ALIGNOF", INSIDE_MAIN, NULL, NULL,
  79           "return __alignof__(double) > 0 ? 0 : 1;" },
  80         { "HAVE_ASPRINTF", DEFINES_FUNC, NULL, NULL,
  81           "#ifndef _GNU_SOURCE\n"
  82           "#define _GNU_SOURCE\n"
  83           "#endif\n"
  84           "#include <stdio.h>\n"
  85           "static char *func(int x) {"
  86           "     char *p;\n"
  87           "     if (asprintf(&p, \"%u\", x) == -1) p = NULL;"
  88           "     return p;\n"
  89           "}" },
  90         { "HAVE_ATTRIBUTE_COLD", DEFINES_FUNC, NULL, NULL,
  91           "static int __attribute__((cold)) func(int x) { return x; }" },
  92         { "HAVE_ATTRIBUTE_CONST", DEFINES_FUNC, NULL, NULL,
  93           "static int __attribute__((const)) func(int x) { return x; }" },
  94         { "HAVE_ATTRIBUTE_PURE", DEFINES_FUNC, NULL, NULL,
  95           "static int __attribute__((pure)) func(int x) { return x; }" },
  96         { "HAVE_ATTRIBUTE_MAY_ALIAS", OUTSIDE_MAIN, NULL, NULL,
  97           "typedef short __attribute__((__may_alias__)) short_a;" },
  98         { "HAVE_ATTRIBUTE_NORETURN", DEFINES_FUNC, NULL, NULL,
  99           "#include <stdlib.h>\n"
 100           "static void __attribute__((noreturn)) func(int x) { exit(x); }" },
 101         { "HAVE_ATTRIBUTE_PRINTF", DEFINES_FUNC, NULL, NULL,
 102           "static void __attribute__((format(__printf__, 1, 2))) func(const char *fmt, ...) { (void)fmt; }" },
 103         { "HAVE_ATTRIBUTE_UNUSED", OUTSIDE_MAIN, NULL, NULL,
 104           "static int __attribute__((unused)) func(int x) { return x; }" },
 105         { "HAVE_ATTRIBUTE_USED", OUTSIDE_MAIN, NULL, NULL,
 106           "static int __attribute__((used)) func(int x) { return x; }" },
 107         { "HAVE_BACKTRACE", DEFINES_FUNC, NULL, NULL,
 108           "#include <execinfo.h>\n"
 109           "static int func(int x) {"
 110           "     void *bt[10];\n"
 111           "     return backtrace(bt, 10) < x;\n"
 112           "}" },
 113         { "HAVE_BIG_ENDIAN", INSIDE_MAIN|EXECUTE, NULL, NULL,
 114           "union { int i; char c[sizeof(int)]; } u;\n"
 115           "u.i = 0x01020304;\n"
 116           "return u.c[0] == 0x01 && u.c[1] == 0x02 && u.c[2] == 0x03 && u.c[3] == 0x04 ? 0 : 1;" },
 117         { "HAVE_BSWAP_64", DEFINES_FUNC, "HAVE_BYTESWAP_H", NULL,
 118           "#include <byteswap.h>\n"
 119           "static int func(int x) { return bswap_64(x); }" },
 120         { "HAVE_BUILTIN_CHOOSE_EXPR", INSIDE_MAIN, NULL, NULL,
 121           "return __builtin_choose_expr(1, 0, \"garbage\");" },
 122         { "HAVE_BUILTIN_CLZ", INSIDE_MAIN, NULL, NULL,
 123           "return __builtin_clz(1) == (sizeof(int)*8 - 1) ? 0 : 1;" },
 124         { "HAVE_BUILTIN_CLZL", INSIDE_MAIN, NULL, NULL,
 125           "return __builtin_clzl(1) == (sizeof(long)*8 - 1) ? 0 : 1;" },
 126         { "HAVE_BUILTIN_CLZLL", INSIDE_MAIN, NULL, NULL,
 127           "return __builtin_clzll(1) == (sizeof(long long)*8 - 1) ? 0 : 1;" },
 128         { "HAVE_BUILTIN_CTZ", INSIDE_MAIN, NULL, NULL,
 129           "return __builtin_ctz(1 << (sizeof(int)*8 - 1)) == (sizeof(int)*8 - 1) ? 0 : 1;" },
 130         { "HAVE_BUILTIN_CTZL", INSIDE_MAIN, NULL, NULL,
 131           "return __builtin_ctzl(1UL << (sizeof(long)*8 - 1)) == (sizeof(long)*8 - 1) ? 0 : 1;" },
 132         { "HAVE_BUILTIN_CTZLL", INSIDE_MAIN, NULL, NULL,
 133           "return __builtin_ctzll(1ULL << (sizeof(long long)*8 - 1)) == (sizeof(long long)*8 - 1) ? 0 : 1;" },
 134         { "HAVE_BUILTIN_CONSTANT_P", INSIDE_MAIN, NULL, NULL,
 135           "return __builtin_constant_p(1) ? 0 : 1;" },
 136         { "HAVE_BUILTIN_EXPECT", INSIDE_MAIN, NULL, NULL,
 137           "return __builtin_expect(argc == 1, 1) ? 0 : 1;" },
 138         { "HAVE_BUILTIN_FFS", INSIDE_MAIN, NULL, NULL,
 139           "return __builtin_ffs(0) == 0 ? 0 : 1;" },
 140         { "HAVE_BUILTIN_FFSL", INSIDE_MAIN, NULL, NULL,
 141           "return __builtin_ffsl(0L) == 0 ? 0 : 1;" },
 142         { "HAVE_BUILTIN_FFSLL", INSIDE_MAIN, NULL, NULL,
 143           "return __builtin_ffsll(0LL) == 0 ? 0 : 1;" },
 144         { "HAVE_BUILTIN_POPCOUNTL", INSIDE_MAIN, NULL, NULL,
 145           "return __builtin_popcountl(255L) == 8 ? 0 : 1;" },
 146         { "HAVE_BUILTIN_TYPES_COMPATIBLE_P", INSIDE_MAIN, NULL, NULL,
 147           "return __builtin_types_compatible_p(char *, int) ? 1 : 0;" },
 148         { "HAVE_ICCARM_INTRINSICS", DEFINES_FUNC, NULL, NULL,
 149           "#include <intrinsics.h>\n"
 150           "int func(int v) {\n"
 151           "     return __CLZ(__RBIT(v));\n"
 152           "}" },
 153         { "HAVE_BYTESWAP_H", OUTSIDE_MAIN, NULL, NULL,
 154           "#include <byteswap.h>\n" },
 155         { "HAVE_CLOCK_GETTIME",
 156           DEFINES_FUNC, "HAVE_STRUCT_TIMESPEC", NULL,
 157           "#include <time.h>\n"
 158           "static struct timespec func(void) {\n"
 159           "     struct timespec ts;\n"
 160           "     clock_gettime(CLOCK_REALTIME, &ts);\n"
 161           "     return ts;\n"
 162           "}\n" },
 163         { "HAVE_CLOCK_GETTIME_IN_LIBRT",
 164           DEFINES_FUNC,
 165           "HAVE_STRUCT_TIMESPEC !HAVE_CLOCK_GETTIME",
 166           "-lrt",
 167           "#include <time.h>\n"
 168           "static struct timespec func(void) {\n"
 169           "     struct timespec ts;\n"
 170           "     clock_gettime(CLOCK_REALTIME, &ts);\n"
 171           "     return ts;\n"
 172           "}\n",
 173           /* This means HAVE_CLOCK_GETTIME, too */
 174           "HAVE_CLOCK_GETTIME" },
 175         { "HAVE_COMPOUND_LITERALS", INSIDE_MAIN, NULL, NULL,
 176           "int *foo = (int[]) { 1, 2, 3, 4 };\n"
 177           "return foo[0] ? 0 : 1;" },
 178         { "HAVE_FCHDIR", DEFINES_EVERYTHING|EXECUTE|MAY_NOT_COMPILE, NULL, NULL,
 179           "#include <sys/types.h>\n"
 180           "#include <sys/stat.h>\n"
 181           "#include <fcntl.h>\n"
 182           "#include <unistd.h>\n"
 183           "int main(void) {\n"
 184           "     int fd = open(\"..\", O_RDONLY);\n"
 185           "     return fchdir(fd) == 0 ? 0 : 1;\n"
 186           "}\n" },
 187         { "HAVE_ERR_H", DEFINES_FUNC, NULL, NULL,
 188           "#include <err.h>\n"
 189           "static void func(int arg) {\n"
 190           "     if (arg == 0)\n"
 191           "             err(1, \"err %u\", arg);\n"
 192           "     if (arg == 1)\n"
 193           "             errx(1, \"err %u\", arg);\n"
 194           "     if (arg == 3)\n"
 195           "             warn(\"warn %u\", arg);\n"
 196           "     if (arg == 4)\n"
 197           "             warnx(\"warn %u\", arg);\n"
 198           "}\n" },
 199         { "HAVE_FILE_OFFSET_BITS", DEFINES_EVERYTHING|EXECUTE|MAY_NOT_COMPILE,
 200           "HAVE_32BIT_OFF_T", NULL,
 201           "#define _FILE_OFFSET_BITS 64\n"
 202           "#include <sys/types.h>\n"
 203           "int main(void) {\n"
 204           "     return sizeof(off_t) == 8 ? 0 : 1;\n"
 205           "}\n" },
 206         { "HAVE_FOR_LOOP_DECLARATION", INSIDE_MAIN, NULL, NULL,
 207           "int ret = 1;\n"
 208           "for (int i = 0; i < argc; i++) { ret = 0; };\n"
 209           "return ret;" },
 210         { "HAVE_FLEXIBLE_ARRAY_MEMBER", OUTSIDE_MAIN, NULL, NULL,
 211           "struct foo { unsigned int x; int arr[]; };" },
 212         { "HAVE_GETPAGESIZE", DEFINES_FUNC, NULL, NULL,
 213           "#include <unistd.h>\n"
 214           "static int func(void) { return getpagesize(); }" },
 215         { "HAVE_ISBLANK", DEFINES_FUNC, NULL, NULL,
 216           "#ifndef _GNU_SOURCE\n"
 217           "#define _GNU_SOURCE\n"
 218           "#endif\n"
 219           "#include <ctype.h>\n"
 220           "static int func(void) { return isblank(' '); }" },
 221         { "HAVE_LITTLE_ENDIAN", INSIDE_MAIN|EXECUTE, NULL, NULL,
 222           "union { int i; char c[sizeof(int)]; } u;\n"
 223           "u.i = 0x01020304;\n"
 224           "return u.c[0] == 0x04 && u.c[1] == 0x03 && u.c[2] == 0x02 && u.c[3] == 0x01 ? 0 : 1;" },
 225         { "HAVE_MEMMEM", DEFINES_FUNC, NULL, NULL,
 226           "#ifndef _GNU_SOURCE\n"
 227           "#define _GNU_SOURCE\n"
 228           "#endif\n"
 229           "#include <string.h>\n"
 230           "static void *func(void *h, size_t hl, void *n, size_t nl) {\n"
 231           "return memmem(h, hl, n, nl);"
 232           "}\n", },
 233         { "HAVE_MEMRCHR", DEFINES_FUNC, NULL, NULL,
 234           "#ifndef _GNU_SOURCE\n"
 235           "#define _GNU_SOURCE\n"
 236           "#endif\n"
 237           "#include <string.h>\n"
 238           "static void *func(void *s, int c, size_t n) {\n"
 239           "return memrchr(s, c, n);"
 240           "}\n", },
 241         { "HAVE_MMAP", DEFINES_FUNC, NULL, NULL,
 242           "#include <sys/mman.h>\n"
 243           "static void *func(int fd) {\n"
 244           "     return mmap(0, 65536, PROT_READ, MAP_SHARED, fd, 0);\n"
 245           "}" },
 246         { "HAVE_PROC_SELF_MAPS", DEFINES_EVERYTHING|EXECUTE|MAY_NOT_COMPILE, NULL, NULL,
 247           "#include <sys/types.h>\n"
 248           "#include <sys/stat.h>\n"
 249           "#include <fcntl.h>\n"
 250           "int main(void) {\n"
 251           "     return open(\"/proc/self/maps\", O_RDONLY) != -1 ? 0 : 1;\n"
 252           "}\n" },
 253         { "HAVE_QSORT_R_PRIVATE_LAST",
 254           DEFINES_EVERYTHING|EXECUTE|MAY_NOT_COMPILE, NULL, NULL,
 255           "#ifndef _GNU_SOURCE\n"
 256           "#define _GNU_SOURCE\n"
 257           "#endif\n"
 258           "#include <stdlib.h>\n"
 259           "static int cmp(const void *lp, const void *rp, void *priv) {\n"
 260           " *(unsigned int *)priv = 1;\n"
 261           " return *(const int *)lp - *(const int *)rp; }\n"
 262           "int main(void) {\n"
 263           " int array[] = { 9, 2, 5 };\n"
 264           " unsigned int called = 0;\n"
 265           " qsort_r(array, 3, sizeof(int), cmp, &called);\n"
 266           " return called && array[0] == 2 && array[1] == 5 && array[2] == 9 ? 0 : 1;\n"
 267           "}\n" },
 268         { "HAVE_STRUCT_TIMESPEC",
 269           DEFINES_FUNC, NULL, NULL,
 270           "#include <time.h>\n"
 271           "static void func(void) {\n"
 272           "     struct timespec ts;\n"
 273           "     ts.tv_sec = ts.tv_nsec = 1;\n"
 274           "}\n" },
 275         { "HAVE_SECTION_START_STOP",
 276           DEFINES_FUNC, NULL, NULL,
 277           "static void *__attribute__((__section__(\"mysec\"))) p = &p;\n"
 278           "static int func(void) {\n"
 279           "     extern void *__start_mysec[], *__stop_mysec[];\n"
 280           "     return __stop_mysec - __start_mysec;\n"
 281           "}\n" },
 282         { "HAVE_STACK_GROWS_UPWARDS", DEFINES_EVERYTHING|EXECUTE, NULL, NULL,
 283           "#include <stddef.h>\n"
 284           "static ptrdiff_t nest(const void *base, unsigned int i)\n"
 285           "{\n"
 286           "     if (i == 0)\n"
 287           "             return (const char *)&i - (const char *)base;\n"
 288           "     return nest(base, i-1);\n"
 289           "}\n"
 290           "int main(int argc, char *argv[]) {\n"
 291           "     (void)argv;\n"
 292           "     return (nest(&argc, argc) > 0) ? 0 : 1;\n"
 293           "}\n" },
 294         { "HAVE_STATEMENT_EXPR", INSIDE_MAIN, NULL, NULL,
 295           "return ({ int x = argc; x == argc ? 0 : 1; });" },
 296         { "HAVE_SYS_FILIO_H", OUTSIDE_MAIN, NULL, NULL, /* Solaris needs this for FIONREAD */
 297           "#include <sys/filio.h>\n" },
 298         { "HAVE_SYS_TERMIOS_H", OUTSIDE_MAIN, NULL, NULL,
 299           "#include <sys/termios.h>\n" },
 300         { "HAVE_TYPEOF", INSIDE_MAIN, NULL, NULL,
 301           "__typeof__(argc) i; i = argc; return i == argc ? 0 : 1;" },
 302         { "HAVE_UNALIGNED_ACCESS", DEFINES_EVERYTHING|EXECUTE, NULL, NULL,
 303           "#include <string.h>\n"
 304           "int main(int argc, char *argv[]) {\n"
 305           "     (void)argc;\n"
 306           "     char pad[sizeof(int *) * 1];\n"
 307           "     strncpy(pad, argv[0], sizeof(pad));\n"
 308           "     int *x = (int *)pad, *y = (int *)(pad + 1);\n"
 309           "     return *x == *y;\n"
 310           "}\n" },
 311         { "HAVE_UTIME", DEFINES_FUNC, NULL, NULL,
 312           "#include <sys/types.h>\n"
 313           "#include <utime.h>\n"
 314           "static int func(const char *filename) {\n"
 315           "     struct utimbuf times = { 0 };\n"
 316           "     return utime(filename, &times);\n"
 317           "}" },
 318         { "HAVE_WARN_UNUSED_RESULT", DEFINES_FUNC, NULL, NULL,
 319           "#include <sys/types.h>\n"
 320           "#include <utime.h>\n"
 321           "static __attribute__((warn_unused_result)) int func(int i) {\n"
 322           "     return i + 1;\n"
 323           "}" },
 324         { "HAVE_OPENMP", INSIDE_MAIN, NULL, NULL,
 325           "int i;\n"
 326           "#pragma omp parallel for\n"
 327           "for(i = 0; i < 0; i++) {};\n"
 328           "return 0;\n",
 329           "-Werror -fopenmp" },
 330         { "HAVE_VALGRIND_MEMCHECK_H", OUTSIDE_MAIN, NULL, NULL,
 331           "#include <valgrind/memcheck.h>\n" },
 332         { "HAVE_UCONTEXT", DEFINES_EVERYTHING|EXECUTE|MAY_NOT_COMPILE,
 333           NULL, NULL,
 334           "#include <ucontext.h>\n"
 335           "static int x = 0;\n"
 336           "static char stack[2048];\n"
 337           "static ucontext_t a, b;\n"
 338           "static void fn(void) {\n"
 339           "     x |= 2;\n"
 340           "     setcontext(&b);\n"
 341           "     x |= 4;\n"
 342           "}\n"
 343           "int main(void) {\n"
 344           "     x |= 1;\n"
 345           "     getcontext(&a);\n"
 346           "     a.uc_stack.ss_sp = stack;\n"
 347           "     a.uc_stack.ss_size = sizeof(stack);\n"
 348           "     makecontext(&a, fn, 0);\n"
 349           "     swapcontext(&b, &a);\n"
 350           "     return (x == 3) ? 0 : 1;\n"
 351           "}\n"
 352         },
 353         { "HAVE_POINTER_SAFE_MAKECONTEXT", DEFINES_EVERYTHING|EXECUTE|MAY_NOT_COMPILE,
 354           "HAVE_UCONTEXT", NULL,
 355           "#include <stddef.h>\n"
 356           "#include <ucontext.h>\n"
 357           "static int worked = 0;\n"
 358           "static char stack[1024];\n"
 359           "static ucontext_t a, b;\n"
 360           "static void fn(void *p, void *q) {\n"
 361           "     void *cp = &worked;\n"
 362           "     void *cq = (void *)(~((ptrdiff_t)cp));\n"
 363           "     if ((p == cp) && (q == cq))\n"
 364           "             worked = 1;\n"
 365           "     setcontext(&b);\n"
 366           "}\n"
 367           "int main(void) {\n"
 368           "     void *ap = &worked;\n"
 369           "     void *aq = (void *)(~((ptrdiff_t)ap));\n"
 370           "     getcontext(&a);\n"
 371           "     a.uc_stack.ss_sp = stack;\n"
 372           "     a.uc_stack.ss_size = sizeof(stack);\n"
 373           "     makecontext(&a, (void (*)(void))fn, 2, ap, aq);\n"
 374           "     swapcontext(&b, &a);\n"
 375           "     return worked ? 0 : 1;\n"
 376           "}\n"
 377         },
 378 };
 379
 380 static char *grab_stream(FILE *file)
 381 {
 382         size_t max, ret, size = 0;
 383         char *buffer;
 384
 385         max = BUFSIZ;
 386         buffer = malloc(max);
 387         while ((ret = fread(buffer+size, 1, max - size, file)) == max - size) {
 388                 size += ret;
 389                 buffer = realloc(buffer, max *= 2);
 390         }
 391         size += ret;
 392         if (ferror(file))
 393                 err(1, "reading from command");
 394         buffer[size] = '\0';
 395         return buffer;
 396 }
 397
 398 static char *run(const char *cmd, int *exitstatus)
 399 {
 400         static const char redir[] = " 2>&1";
 401         size_t cmdlen;
 402         char *cmdredir;
 403         FILE *cmdout;
 404         char *ret;
 405
 406         cmdlen = strlen(cmd);
 407         cmdredir = malloc(cmdlen + sizeof(redir));
 408         memcpy(cmdredir, cmd, cmdlen);
 409         memcpy(cmdredir + cmdlen, redir, sizeof(redir));
 410
 411         cmdout = popen(cmdredir, "r");
 412         if (!cmdout)
 413                 err(1, "popen \"%s\"", cmdredir);
 414
 415         free(cmdredir);
 416
 417         ret = grab_stream(cmdout);
 418         *exitstatus = pclose(cmdout);
 419         return ret;
 420 }
 421
 422 static char *connect_args(const char *argv[], const char *extra)
 423 {
 424         unsigned int i, len = strlen(extra) + 1;
 425         char *ret;
 426
 427         for (i = 1; argv[i]; i++)
 428                 len += 1 + strlen(argv[i]);
 429
 430         ret = malloc(len);
 431         len = 0;
 432         for (i = 1; argv[i]; i++) {
 433                 strcpy(ret + len, argv[i]);
 434                 len += strlen(argv[i]);
 435                 if (argv[i+1])
 436                         ret[len++] = ' ';
 437         }
 438         strcpy(ret + len, extra);
 439         return ret;
 440 }
 441
 442 static struct test *find_test(const char *name)
 443 {
 444         unsigned int i;
 445
 446         for (i = 0; i < sizeof(tests)/sizeof(tests[0]); i++) {
 447                 if (strcmp(tests[i].name, name) == 0)
 448                         return &tests[i];
 449         }
 450         abort();
 451 }
 452
 453 #define PRE_BOILERPLATE "/* Test program generated by configurator. */\n"
 454 #define MAIN_START_BOILERPLATE \
 455         "int main(int argc, char *argv[]) {\n" \
 456         "       (void)argc;\n" \
 457         "       (void)argv;\n"
 458 #define USE_FUNC_BOILERPLATE "(void)func;\n"
 459 #define MAIN_BODY_BOILERPLATE "return 0;\n"
 460 #define MAIN_END_BOILERPLATE "}\n"
 461
 462 static bool run_test(const char *cmd, struct test *test)
 463 {
 464         char *output, *newcmd;
 465         FILE *outf;
 466         int status;
 467
 468         if (test->done)
 469                 return test->answer;
 470
 471         if (test->depends) {
 472                 size_t len;
 473                 const char *deps = test->depends;
 474                 char *dep;
 475
 476                 /* Space-separated dependencies, could be ! for inverse. */
 477                 while ((len = strcspn(deps, " ")) != 0) {
 478                         bool positive = true;
 479                         if (deps[len]) {
 480                                 dep = strdup(deps);
 481                                 dep[len] = '\0';
 482                         } else {
 483                                 dep = (char *)deps;
 484                         }
 485
 486                         if (dep[0] == '!') {
 487                                 dep++;
 488                                 positive = false;
 489                         }
 490                         if (run_test(cmd, find_test(dep)) != positive) {
 491                                 test->answer = false;
 492                                 test->done = true;
 493                                 return test->answer;
 494                         }
 495                         if (deps[len])
 496                                 free(dep);
 497
 498                         deps += len;
 499                         deps += strspn(deps, " ");
 500                 }
 501         }
 502
 503         outf = fopen(INPUT_FILE, "w");
 504         if (!outf)
 505                 err(1, "creating %s", INPUT_FILE);
 506
 507         fprintf(outf, "%s", PRE_BOILERPLATE);
 508         switch (test->style & ~(EXECUTE|MAY_NOT_COMPILE)) {
 509         case INSIDE_MAIN:
 510                 fprintf(outf, "%s", MAIN_START_BOILERPLATE);
 511                 fprintf(outf, "%s", test->fragment);
 512                 fprintf(outf, "%s", MAIN_END_BOILERPLATE);
 513                 break;
 514         case OUTSIDE_MAIN:
 515                 fprintf(outf, "%s", test->fragment);
 516                 fprintf(outf, "%s", MAIN_START_BOILERPLATE);
 517                 fprintf(outf, "%s", MAIN_BODY_BOILERPLATE);
 518                 fprintf(outf, "%s", MAIN_END_BOILERPLATE);
 519                 break;
 520         case DEFINES_FUNC:
 521                 fprintf(outf, "%s", test->fragment);
 522                 fprintf(outf, "%s", MAIN_START_BOILERPLATE);
 523                 fprintf(outf, "%s", USE_FUNC_BOILERPLATE);
 524                 fprintf(outf, "%s", MAIN_BODY_BOILERPLATE);
 525                 fprintf(outf, "%s", MAIN_END_BOILERPLATE);
 526                 break;
 527         case DEFINES_EVERYTHING:
 528                 fprintf(outf, "%s", test->fragment);
 529                 break;
 530         default:
 531                 abort();
 532
 533         }
 534         fclose(outf);
 535
 536         if (verbose > 1)
 537                 if (system("cat " INPUT_FILE) == -1)
 538                         ;
 539
 540         newcmd = strdup(cmd);
 541
 542         if (test->flags) {
 543                 newcmd = realloc(newcmd, strlen(newcmd) + strlen(" ")
 544                                 + strlen(test->flags) + 1);
 545                 strcat(newcmd, " ");
 546                 strcat(newcmd, test->flags);
 547                 if (verbose > 1)
 548                         printf("Extra flags line: %s", newcmd);
 549         }
 550
 551         if (test->link) {
 552                 newcmd = realloc(newcmd, strlen(newcmd) + strlen(" ")
 553                                 + strlen(test->link) + 1);
 554                 strcat(newcmd, " ");
 555                 strcat(newcmd, test->link);
 556                 if (verbose > 1)
 557                         printf("Extra link line: %s", newcmd);
 558         }
 559
 560         output = run(newcmd, &status);
 561
 562         free(newcmd);
 563
 564         if (status != 0 || strstr(output, "warning")) {
 565                 if (verbose)
 566                         printf("Compile %s for %s, status %i: %s\n",
 567                                status ? "fail" : "warning",
 568                                test->name, status, output);
 569                 if ((test->style & EXECUTE) && !(test->style & MAY_NOT_COMPILE))
 570                         errx(1, "Test for %s did not compile:\n%s",
 571                              test->name, output);
 572                 test->answer = false;
 573                 free(output);
 574         } else {
 575                 /* Compile succeeded. */
 576                 free(output);
 577                 /* We run INSIDE_MAIN tests for sanity checking. */
 578                 if ((test->style & EXECUTE) || (test->style & INSIDE_MAIN)) {
 579                         output = run("." DIR_SEP OUTPUT_FILE, &status);
 580                         if (!(test->style & EXECUTE) && status != 0)
 581                                 errx(1, "Test for %s failed with %i:\n%s",
 582                                      test->name, status, output);
 583                         if (verbose && status)
 584                                 printf("%s exited %i\n", test->name, status);
 585                         free(output);
 586                 }
 587                 test->answer = (status == 0);
 588         }
 589         test->done = true;
 590
 591         if (test->answer && test->overrides) {
 592                 struct test *override = find_test(test->overrides);
 593                 override->done = true;
 594                 override->answer = true;
 595         }
 596         return test->answer;
 597 }
 598
 599 int main(int argc, const char *argv[])
 600 {
 601         char *cmd;
 602         unsigned int i;
 603         const char *default_args[]
 604                 = { "", DEFAULT_COMPILER, DEFAULT_FLAGS, NULL };
 605
 606         if (argc > 1) {
 607                 if (strcmp(argv[1], "--help") == 0) {
 608                         printf("Usage: configurator [-v] [<compiler> <flags>...]\n"
 609                                "  <compiler> <flags> will have \"-o <outfile> <infile.c>\" appended\n"
 610                                "Default: %s %s\n",
 611                                DEFAULT_COMPILER, DEFAULT_FLAGS);
 612                         exit(0);
 613                 }
 614                 if (strcmp(argv[1], "-v") == 0) {
 615                         argc--;
 616                         argv++;
 617                         verbose = 1;
 618                 } else if (strcmp(argv[1], "-vv") == 0) {
 619                         argc--;
 620                         argv++;
 621                         verbose = 2;
 622                 }
 623         }
 624
 625         if (argc == 1)
 626                 argv = default_args;
 627
 628         cmd = connect_args(argv, " -o " OUTPUT_FILE " " INPUT_FILE);
 629         for (i = 0; i < sizeof(tests)/sizeof(tests[0]); i++)
 630                 run_test(cmd, &tests[i]);
 631         free(cmd);
 632
 633         remove(OUTPUT_FILE);
 634         remove(INPUT_FILE);
 635
 636         printf("/* Generated by CCAN configurator */\n"
 637                "#ifndef CCAN_CONFIG_H\n"
 638                "#define CCAN_CONFIG_H\n");
 639         printf("#ifndef _GNU_SOURCE\n");
 640         printf("#define _GNU_SOURCE /* Always use GNU extensions. */\n");
 641         printf("#endif\n");
 642         printf("#define CCAN_COMPILER \"%s\"\n", argv[1]);
 643         cmd = connect_args(argv+1, "");
 644         printf("#define CCAN_CFLAGS \"%s\"\n\n", cmd);
 645         free(cmd);
 646         /* This one implies "#include <ccan/..." works, eg. for tdb2.h */
 647         printf("#define HAVE_CCAN 1\n");
 648         for (i = 0; i < sizeof(tests)/sizeof(tests[0]); i++)
 649                 printf("#define %s %u\n", tests[i].name, tests[i].answer);
 650         printf("#endif /* CCAN_CONFIG_H */\n");
 651         return 0;
 652 }