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 *flags;
  59         const char *overrides; /* On success, force this to '1' */
  60         bool done;
  61         bool answer;
  62 };
  63
  64 static struct test tests[] = {
  65         { "HAVE_32BIT_OFF_T", DEFINES_EVERYTHING|EXECUTE, NULL, NULL,
  66           "#include <sys/types.h>\n"
  67           "int main(void) {\n"
  68           "     return sizeof(off_t) == 4 ? 0 : 1;\n"
  69           "}\n" },
  70         { "HAVE_ALIGNOF", INSIDE_MAIN, NULL, NULL,
  71           "return __alignof__(double) > 0 ? 0 : 1;" },
  72         { "HAVE_ASPRINTF", DEFINES_FUNC, NULL, NULL,
  73           "#ifndef _GNU_SOURCE\n"
  74           "#define _GNU_SOURCE\n"
  75           "#endif\n"
  76           "#include <stdio.h>\n"
  77           "static char *func(int x) {"
  78           "     char *p;\n"
  79           "     if (asprintf(&p, \"%u\", x) == -1) p = NULL;"
  80           "     return p;\n"
  81           "}" },
  82         { "HAVE_ATTRIBUTE_COLD", DEFINES_FUNC, NULL, NULL,
  83           "static int __attribute__((cold)) func(int x) { return x; }" },
  84         { "HAVE_ATTRIBUTE_CONST", DEFINES_FUNC, NULL, NULL,
  85           "static int __attribute__((const)) func(int x) { return x; }" },
  86         { "HAVE_ATTRIBUTE_PURE", DEFINES_FUNC, NULL, NULL,
  87           "static int __attribute__((pure)) func(int x) { return x; }" },
  88         { "HAVE_ATTRIBUTE_MAY_ALIAS", OUTSIDE_MAIN, NULL, NULL,
  89           "typedef short __attribute__((__may_alias__)) short_a;" },
  90         { "HAVE_ATTRIBUTE_NORETURN", DEFINES_FUNC, NULL, NULL,
  91           "#include <stdlib.h>\n"
  92           "static void __attribute__((noreturn)) func(int x) { exit(x); }" },
  93         { "HAVE_ATTRIBUTE_PRINTF", DEFINES_FUNC, NULL, NULL,
  94           "static void __attribute__((format(__printf__, 1, 2))) func(const char *fmt, ...) { (void)fmt; }" },
  95         { "HAVE_ATTRIBUTE_UNUSED", OUTSIDE_MAIN, NULL, NULL,
  96           "static int __attribute__((unused)) func(int x) { return x; }" },
  97         { "HAVE_ATTRIBUTE_USED", OUTSIDE_MAIN, NULL, NULL,
  98           "static int __attribute__((used)) func(int x) { return x; }" },
  99         { "HAVE_BACKTRACE", DEFINES_FUNC, NULL, NULL,
 100           "#include <execinfo.h>\n"
 101           "static int func(int x) {"
 102           "     void *bt[10];\n"
 103           "     return backtrace(bt, 10) < x;\n"
 104           "}" },
 105         { "HAVE_BIG_ENDIAN", INSIDE_MAIN|EXECUTE, NULL, NULL,
 106           "union { int i; char c[sizeof(int)]; } u;\n"
 107           "u.i = 0x01020304;\n"
 108           "return u.c[0] == 0x01 && u.c[1] == 0x02 && u.c[2] == 0x03 && u.c[3] == 0x04 ? 0 : 1;" },
 109         { "HAVE_BSWAP_64", DEFINES_FUNC, "HAVE_BYTESWAP_H", NULL,
 110           "#include <byteswap.h>\n"
 111           "static int func(int x) { return bswap_64(x); }" },
 112         { "HAVE_BUILTIN_CHOOSE_EXPR", INSIDE_MAIN, NULL, NULL,
 113           "return __builtin_choose_expr(1, 0, \"garbage\");" },
 114         { "HAVE_BUILTIN_CLZ", INSIDE_MAIN, NULL, NULL,
 115           "return __builtin_clz(1) == (sizeof(int)*8 - 1) ? 0 : 1;" },
 116         { "HAVE_BUILTIN_CLZL", INSIDE_MAIN, NULL, NULL,
 117           "return __builtin_clzl(1) == (sizeof(long)*8 - 1) ? 0 : 1;" },
 118         { "HAVE_BUILTIN_CLZLL", INSIDE_MAIN, NULL, NULL,
 119           "return __builtin_clzll(1) == (sizeof(long long)*8 - 1) ? 0 : 1;" },
 120         { "HAVE_BUILTIN_CTZ", INSIDE_MAIN, NULL, NULL,
 121           "return __builtin_ctz(1 << (sizeof(int)*8 - 1)) == (sizeof(int)*8 - 1) ? 0 : 1;" },
 122         { "HAVE_BUILTIN_CTZL", INSIDE_MAIN, NULL, NULL,
 123           "return __builtin_ctzl(1UL << (sizeof(long)*8 - 1)) == (sizeof(long)*8 - 1) ? 0 : 1;" },
 124         { "HAVE_BUILTIN_CTZLL", INSIDE_MAIN, NULL, NULL,
 125           "return __builtin_ctzll(1ULL << (sizeof(long long)*8 - 1)) == (sizeof(long long)*8 - 1) ? 0 : 1;" },
 126         { "HAVE_BUILTIN_CONSTANT_P", INSIDE_MAIN, NULL, NULL,
 127           "return __builtin_constant_p(1) ? 0 : 1;" },
 128         { "HAVE_BUILTIN_EXPECT", INSIDE_MAIN, NULL, NULL,
 129           "return __builtin_expect(argc == 1, 1) ? 0 : 1;" },
 130         { "HAVE_BUILTIN_FFS", INSIDE_MAIN, NULL, NULL,
 131           "return __builtin_ffs(0) == 0 ? 0 : 1;" },
 132         { "HAVE_BUILTIN_FFSL", INSIDE_MAIN, NULL, NULL,
 133           "return __builtin_ffsl(0L) == 0 ? 0 : 1;" },
 134         { "HAVE_BUILTIN_FFSLL", INSIDE_MAIN, NULL, NULL,
 135           "return __builtin_ffsll(0LL) == 0 ? 0 : 1;" },
 136         { "HAVE_BUILTIN_POPCOUNTL", INSIDE_MAIN, NULL, NULL,
 137           "return __builtin_popcountl(255L) == 8 ? 0 : 1;" },
 138         { "HAVE_BUILTIN_TYPES_COMPATIBLE_P", INSIDE_MAIN, NULL, NULL,
 139           "return __builtin_types_compatible_p(char *, int) ? 1 : 0;" },
 140         { "HAVE_ICCARM_INTRINSICS", DEFINES_FUNC, NULL, NULL,
 141           "#include <intrinsics.h>\n"
 142           "int func(int v) {\n"
 143           "     return __CLZ(__RBIT(v));\n"
 144           "}" },
 145         { "HAVE_BYTESWAP_H", OUTSIDE_MAIN, NULL, NULL,
 146           "#include <byteswap.h>\n" },
 147         { "HAVE_CLOCK_GETTIME",
 148           DEFINES_FUNC, "HAVE_STRUCT_TIMESPEC", NULL,
 149           "#include <time.h>\n"
 150           "static struct timespec func(void) {\n"
 151           "     struct timespec ts;\n"
 152           "     clock_gettime(CLOCK_REALTIME, &ts);\n"
 153           "     return ts;\n"
 154           "}\n" },
 155         { "HAVE_CLOCK_GETTIME_IN_LIBRT",
 156           DEFINES_FUNC,
 157           "HAVE_STRUCT_TIMESPEC !HAVE_CLOCK_GETTIME",
 158           "-lrt",
 159           "#include <time.h>\n"
 160           "static struct timespec func(void) {\n"
 161           "     struct timespec ts;\n"
 162           "     clock_gettime(CLOCK_REALTIME, &ts);\n"
 163           "     return ts;\n"
 164           "}\n",
 165           /* This means HAVE_CLOCK_GETTIME, too */
 166           "HAVE_CLOCK_GETTIME" },
 167         { "HAVE_COMPOUND_LITERALS", INSIDE_MAIN, NULL, NULL,
 168           "int *foo = (int[]) { 1, 2, 3, 4 };\n"
 169           "return foo[0] ? 0 : 1;" },
 170         { "HAVE_FCHDIR", DEFINES_EVERYTHING|EXECUTE, NULL, NULL,
 171           "#include <sys/types.h>\n"
 172           "#include <sys/stat.h>\n"
 173           "#include <fcntl.h>\n"
 174           "#include <unistd.h>\n"
 175           "int main(void) {\n"
 176           "     int fd = open(\"..\", O_RDONLY);\n"
 177           "     return fchdir(fd) == 0 ? 0 : 1;\n"
 178           "}\n" },
 179         { "HAVE_ERR_H", DEFINES_FUNC, NULL, NULL,
 180           "#include <err.h>\n"
 181           "static void func(int arg) {\n"
 182           "     if (arg == 0)\n"
 183           "             err(1, \"err %u\", arg);\n"
 184           "     if (arg == 1)\n"
 185           "             errx(1, \"err %u\", arg);\n"
 186           "     if (arg == 3)\n"
 187           "             warn(\"warn %u\", arg);\n"
 188           "     if (arg == 4)\n"
 189           "             warnx(\"warn %u\", arg);\n"
 190           "}\n" },
 191         { "HAVE_FILE_OFFSET_BITS", DEFINES_EVERYTHING|EXECUTE,
 192           "HAVE_32BIT_OFF_T", NULL,
 193           "#define _FILE_OFFSET_BITS 64\n"
 194           "#include <sys/types.h>\n"
 195           "int main(void) {\n"
 196           "     return sizeof(off_t) == 8 ? 0 : 1;\n"
 197           "}\n" },
 198         { "HAVE_FOR_LOOP_DECLARATION", INSIDE_MAIN, NULL, NULL,
 199           "for (int i = 0; i < argc; i++) { return 0; };\n"
 200           "return 1;" },
 201         { "HAVE_FLEXIBLE_ARRAY_MEMBER", OUTSIDE_MAIN, NULL, NULL,
 202           "struct foo { unsigned int x; int arr[]; };" },
 203         { "HAVE_GETPAGESIZE", DEFINES_FUNC, NULL, NULL,
 204           "#include <unistd.h>\n"
 205           "static int func(void) { return getpagesize(); }" },
 206         { "HAVE_ISBLANK", DEFINES_FUNC, NULL, NULL,
 207           "#ifndef _GNU_SOURCE\n"
 208           "#define _GNU_SOURCE\n"
 209           "#endif\n"
 210           "#include <ctype.h>\n"
 211           "static int func(void) { return isblank(' '); }" },
 212         { "HAVE_LITTLE_ENDIAN", INSIDE_MAIN|EXECUTE, NULL, NULL,
 213           "union { int i; char c[sizeof(int)]; } u;\n"
 214           "u.i = 0x01020304;\n"
 215           "return u.c[0] == 0x04 && u.c[1] == 0x03 && u.c[2] == 0x02 && u.c[3] == 0x01 ? 0 : 1;" },
 216         { "HAVE_MEMMEM", DEFINES_FUNC, NULL, NULL,
 217           "#ifndef _GNU_SOURCE\n"
 218           "#define _GNU_SOURCE\n"
 219           "#endif\n"
 220           "#include <string.h>\n"
 221           "static void *func(void *h, size_t hl, void *n, size_t nl) {\n"
 222           "return memmem(h, hl, n, nl);"
 223           "}\n", },
 224         { "HAVE_MEMRCHR", DEFINES_FUNC, NULL, NULL,
 225           "#ifndef _GNU_SOURCE\n"
 226           "#define _GNU_SOURCE\n"
 227           "#endif\n"
 228           "#include <string.h>\n"
 229           "static void *func(void *s, int c, size_t n) {\n"
 230           "return memrchr(s, c, n);"
 231           "}\n", },
 232         { "HAVE_MMAP", DEFINES_FUNC, NULL, NULL,
 233           "#include <sys/mman.h>\n"
 234           "static void *func(int fd) {\n"
 235           "     return mmap(0, 65536, PROT_READ, MAP_SHARED, fd, 0);\n"
 236           "}" },
 237         { "HAVE_PROC_SELF_MAPS", DEFINES_EVERYTHING|EXECUTE, NULL, NULL,
 238           "#include <sys/types.h>\n"
 239           "#include <sys/stat.h>\n"
 240           "#include <fcntl.h>\n"
 241           "int main(void) {\n"
 242           "     return open(\"/proc/self/maps\", O_RDONLY) != -1 ? 0 : 1;\n"
 243           "}\n" },
 244         { "HAVE_QSORT_R_PRIVATE_LAST",
 245           DEFINES_EVERYTHING|EXECUTE|MAY_NOT_COMPILE, NULL, NULL,
 246           "#ifndef _GNU_SOURCE\n"
 247           "#define _GNU_SOURCE\n"
 248           "#endif\n"
 249           "#include <stdlib.h>\n"
 250           "static int cmp(const void *lp, const void *rp, void *priv) {\n"
 251           " *(unsigned int *)priv = 1;\n"
 252           " return *(const int *)lp - *(const int *)rp; }\n"
 253           "int main(void) {\n"
 254           " int array[] = { 9, 2, 5 };\n"
 255           " unsigned int called = 0;\n"
 256           " qsort_r(array, 3, sizeof(int), cmp, &called);\n"
 257           " return called && array[0] == 2 && array[1] == 5 && array[2] == 9 ? 0 : 1;\n"
 258           "}\n" },
 259         { "HAVE_STRUCT_TIMESPEC",
 260           DEFINES_FUNC, NULL, NULL,
 261           "#include <time.h>\n"
 262           "static void func(void) {\n"
 263           "     struct timespec ts;\n"
 264           "     ts.tv_sec = ts.tv_nsec = 1;\n"
 265           "}\n" },
 266         { "HAVE_SECTION_START_STOP",
 267           DEFINES_FUNC, NULL, NULL,
 268           "static void *__attribute__((__section__(\"mysec\"))) p = &p;\n"
 269           "static int func(void) {\n"
 270           "     extern void *__start_mysec[], *__stop_mysec[];\n"
 271           "     return __stop_mysec - __start_mysec;\n"
 272           "}\n" },
 273         { "HAVE_STACK_GROWS_UPWARDS", DEFINES_EVERYTHING|EXECUTE, NULL, NULL,
 274           "static long nest(const void *base, unsigned int i)\n"
 275           "{\n"
 276           "     if (i == 0)\n"
 277           "             return (const char *)&i - (const char *)base;\n"
 278           "     return nest(base, i-1);\n"
 279           "}\n"
 280           "int main(int argc, char *argv[]) {\n"
 281           "     (void)argv;\n"
 282           "     return (nest(&argc, argc) > 0) ? 0 : 1;\n"
 283           "}\n" },
 284         { "HAVE_STATEMENT_EXPR", INSIDE_MAIN, NULL, NULL,
 285           "return ({ int x = argc; x == argc ? 0 : 1; });" },
 286         { "HAVE_SYS_FILIO_H", OUTSIDE_MAIN, NULL, NULL, /* Solaris needs this for FIONREAD */
 287           "#include <sys/filio.h>\n" },
 288         { "HAVE_SYS_TERMIOS_H", OUTSIDE_MAIN, NULL, NULL,
 289           "#include <sys/termios.h>\n" },
 290         { "HAVE_TYPEOF", INSIDE_MAIN, NULL, NULL,
 291           "__typeof__(argc) i; i = argc; return i == argc ? 0 : 1;" },
 292         { "HAVE_UNALIGNED_ACCESS", DEFINES_EVERYTHING|EXECUTE, NULL, NULL,
 293           "#include <string.h>\n"
 294           "int main(int argc, char *argv[]) {\n"
 295           "     (void)argc;\n"
 296           "     char pad[sizeof(int *) * 1];\n"
 297           "     strncpy(pad, argv[0], sizeof(pad));\n"
 298           "     int *x = (int *)pad, *y = (int *)(pad + 1);\n"
 299           "     return *x == *y;\n"
 300           "}\n" },
 301         { "HAVE_UTIME", DEFINES_FUNC, NULL, NULL,
 302           "#include <sys/types.h>\n"
 303           "#include <utime.h>\n"
 304           "static int func(const char *filename) {\n"
 305           "     struct utimbuf times = { 0 };\n"
 306           "     return utime(filename, &times);\n"
 307           "}" },
 308         { "HAVE_WARN_UNUSED_RESULT", DEFINES_FUNC, NULL, NULL,
 309           "#include <sys/types.h>\n"
 310           "#include <utime.h>\n"
 311           "static __attribute__((warn_unused_result)) int func(int i) {\n"
 312           "     return i + 1;\n"
 313           "}" },
 314         { "HAVE_OPENMP", INSIDE_MAIN, NULL, NULL,
 315           "int i;\n"
 316           "#pragma omp parallel for\n"
 317           "for(i = 0; i < 0; i++) {};\n"
 318           "return 0;\n",
 319           "-Werror -fopenmp" },
 320         { "HAVE_VALGRIND_MEMCHECK_H", OUTSIDE_MAIN, NULL, NULL,
 321           "#include <valgrind/memcheck.h>\n" },
 322         { "HAVE_UCONTEXT", DEFINES_EVERYTHING|EXECUTE,
 323           NULL, NULL,
 324           "#include <ucontext.h>\n"
 325           "static int x = 0;\n"
 326           "static char stack[1024];\n"
 327           "static ucontext_t a, b;\n"
 328           "static void fn(void) {\n"
 329           "     x |= 2;\n"
 330           "     setcontext(&b);\n"
 331           "     x |= 4;\n"
 332           "}\n"
 333           "int main(int argc, char *argv[]) {\n"
 334           "     x |= 1;\n"
 335           "     getcontext(&a);\n"
 336           "     a.uc_stack.ss_sp = stack;\n"
 337           "     a.uc_stack.ss_size = sizeof(stack);\n"
 338           "     makecontext(&a, fn, 0);\n"
 339           "     swapcontext(&b, &a);\n"
 340           "     return (x == 3) ? 0 : 1;\n"
 341           "}\n"
 342         },
 343         { "HAVE_POINTER_SAFE_MAKECONTEXT", DEFINES_EVERYTHING|EXECUTE,
 344           "HAVE_UCONTEXT", NULL,
 345           "#include <stddef.h>\n"
 346           "#include <ucontext.h>\n"
 347           "static int worked = 0;\n"
 348           "static char stack[1024];\n"
 349           "static ucontext_t a, b;\n"
 350           "static void fn(void *p, void *q) {\n"
 351           "     void *cp = &worked;\n"
 352           "     void *cq = (void *)(~((ptrdiff_t)cp));\n"
 353           "     if ((p == cp) && (q == cq))\n"
 354           "             worked = 1;\n"
 355           "     setcontext(&b);\n"
 356           "}\n"
 357           "int main(int argc, char *argv[]) {\n"
 358           "     void *ap = &worked;\n"
 359           "     void *aq = (void *)(~((ptrdiff_t)ap));\n"
 360           "     getcontext(&a);\n"
 361           "     a.uc_stack.ss_sp = stack;\n"
 362           "     a.uc_stack.ss_size = sizeof(stack);\n"
 363           "     makecontext(&a, (void (*)(void))fn, 2, ap, aq);\n"
 364           "     swapcontext(&b, &a);\n"
 365           "     return worked ? 0 : 1;\n"
 366           "}\n"
 367         },
 368 };
 369
 370 static char *grab_fd(int fd)
 371 {
 372         int ret;
 373         size_t max, size = 0;
 374         char *buffer;
 375
 376         max = 16384;
 377         buffer = malloc(max+1);
 378         while ((ret = read(fd, buffer + size, max - size)) > 0) {
 379                 size += ret;
 380                 if (size == max)
 381                         buffer = realloc(buffer, max *= 2);
 382         }
 383         if (ret < 0)
 384                 err(1, "reading from command");
 385         buffer[size] = '\0';
 386         return buffer;
 387 }
 388
 389 static char *run(const char *cmd, int *exitstatus)
 390 {
 391         pid_t pid;
 392         int p[2];
 393         char *ret;
 394         int status;
 395
 396         if (pipe(p) != 0)
 397                 err(1, "creating pipe");
 398
 399         pid = fork();
 400         if (pid == -1)
 401                 err(1, "forking");
 402
 403         if (pid == 0) {
 404                 if (dup2(p[1], STDOUT_FILENO) != STDOUT_FILENO
 405                     || dup2(p[1], STDERR_FILENO) != STDERR_FILENO
 406                     || close(p[0]) != 0
 407                     || close(STDIN_FILENO) != 0
 408                     || open("/dev/null", O_RDONLY) != STDIN_FILENO)
 409                         exit(128);
 410
 411                 status = system(cmd);
 412                 if (WIFEXITED(status))
 413                         exit(WEXITSTATUS(status));
 414                 /* Here's a hint... */
 415                 exit(128 + WTERMSIG(status));
 416         }
 417
 418         close(p[1]);
 419         ret = grab_fd(p[0]);
 420         /* This shouldn't fail... */
 421         if (waitpid(pid, &status, 0) != pid)
 422                 err(1, "Failed to wait for child");
 423         close(p[0]);
 424         if (WIFEXITED(status))
 425                 *exitstatus = WEXITSTATUS(status);
 426         else
 427                 *exitstatus = -WTERMSIG(status);
 428         return ret;
 429 }
 430
 431 static char *connect_args(const char *argv[], const char *extra)
 432 {
 433         unsigned int i, len = strlen(extra) + 1;
 434         char *ret;
 435
 436         for (i = 1; argv[i]; i++)
 437                 len += 1 + strlen(argv[i]);
 438
 439         ret = malloc(len);
 440         len = 0;
 441         for (i = 1; argv[i]; i++) {
 442                 strcpy(ret + len, argv[i]);
 443                 len += strlen(argv[i]);
 444                 if (argv[i+1])
 445                         ret[len++] = ' ';
 446         }
 447         strcpy(ret + len, extra);
 448         return ret;
 449 }
 450
 451 static struct test *find_test(const char *name)
 452 {
 453         unsigned int i;
 454
 455         for (i = 0; i < sizeof(tests)/sizeof(tests[0]); i++) {
 456                 if (strcmp(tests[i].name, name) == 0)
 457                         return &tests[i];
 458         }
 459         abort();
 460 }
 461
 462 #define PRE_BOILERPLATE "/* Test program generated by configurator. */\n"
 463 #define MAIN_START_BOILERPLATE \
 464         "int main(int argc, char *argv[]) {\n" \
 465         "       (void)argc;\n" \
 466         "       (void)argv;\n"
 467 #define USE_FUNC_BOILERPLATE "(void)func;\n"
 468 #define MAIN_BODY_BOILERPLATE "return 0;\n"
 469 #define MAIN_END_BOILERPLATE "}\n"
 470
 471 static bool run_test(const char *cmd, struct test *test)
 472 {
 473         char *output, *newcmd;
 474         FILE *outf;
 475         int status;
 476
 477         if (test->done)
 478                 return test->answer;
 479
 480         if (test->depends) {
 481                 size_t len;
 482                 const char *deps = test->depends;
 483                 char *dep;
 484
 485                 /* Space-separated dependencies, could be ! for inverse. */
 486                 while ((len = strcspn(deps, " "))) {
 487                         bool positive = true;
 488                         if (deps[len]) {
 489                                 dep = strdup(deps);
 490                                 dep[len] = '\0';
 491                         } else {
 492                                 dep = (char *)deps;
 493                         }
 494
 495                         if (dep[0] == '!') {
 496                                 dep++;
 497                                 positive = false;
 498                         }
 499                         if (run_test(cmd, find_test(dep)) != positive) {
 500                                 test->answer = false;
 501                                 test->done = true;
 502                                 return test->answer;
 503                         }
 504                         if (deps[len])
 505                                 free(dep);
 506
 507                         deps += len;
 508                         deps += strspn(deps, " ");
 509                 }
 510         }
 511
 512         outf = fopen(INPUT_FILE, "w");
 513         if (!outf)
 514                 err(1, "creating %s", INPUT_FILE);
 515
 516         fprintf(outf, "%s", PRE_BOILERPLATE);
 517         switch (test->style & ~(EXECUTE|MAY_NOT_COMPILE)) {
 518         case INSIDE_MAIN:
 519                 fprintf(outf, "%s", MAIN_START_BOILERPLATE);
 520                 fprintf(outf, "%s", test->fragment);
 521                 fprintf(outf, "%s", MAIN_END_BOILERPLATE);
 522                 break;
 523         case OUTSIDE_MAIN:
 524                 fprintf(outf, "%s", test->fragment);
 525                 fprintf(outf, "%s", MAIN_START_BOILERPLATE);
 526                 fprintf(outf, "%s", MAIN_BODY_BOILERPLATE);
 527                 fprintf(outf, "%s", MAIN_END_BOILERPLATE);
 528                 break;
 529         case DEFINES_FUNC:
 530                 fprintf(outf, "%s", test->fragment);
 531                 fprintf(outf, "%s", MAIN_START_BOILERPLATE);
 532                 fprintf(outf, "%s", USE_FUNC_BOILERPLATE);
 533                 fprintf(outf, "%s", MAIN_BODY_BOILERPLATE);
 534                 fprintf(outf, "%s", MAIN_END_BOILERPLATE);
 535                 break;
 536         case DEFINES_EVERYTHING:
 537                 fprintf(outf, "%s", test->fragment);
 538                 break;
 539         default:
 540                 abort();
 541
 542         }
 543         fclose(outf);
 544
 545         if (verbose > 1)
 546                 if (system("cat " INPUT_FILE) == -1)
 547                         ;
 548
 549         newcmd = strdup(cmd);
 550
 551         if (test->flags) {
 552                 newcmd = realloc(newcmd, strlen(newcmd) + strlen(" ")
 553                                 + strlen(test->flags) + 1);
 554                 strcat(newcmd, " ");
 555                 strcat(newcmd, test->flags);
 556                 if (verbose > 1)
 557                         printf("Extra flags line: %s", newcmd);
 558         }
 559
 560         if (test->link) {
 561                 newcmd = realloc(newcmd, strlen(newcmd) + strlen(" ")
 562                                 + strlen(test->link) + 1);
 563                 strcat(newcmd, " ");
 564                 strcat(newcmd, test->link);
 565                 if (verbose > 1)
 566                         printf("Extra link line: %s", newcmd);
 567         }
 568
 569         output = run(newcmd, &status);
 570
 571         free(newcmd);
 572
 573         if (status != 0 || strstr(output, "warning")) {
 574                 if (verbose)
 575                         printf("Compile %s for %s, status %i: %s\n",
 576                                status ? "fail" : "warning",
 577                                test->name, status, output);
 578                 if ((test->style & EXECUTE) && !(test->style & MAY_NOT_COMPILE))
 579                         errx(1, "Test for %s did not compile:\n%s",
 580                              test->name, output);
 581                 test->answer = false;
 582                 free(output);
 583         } else {
 584                 /* Compile succeeded. */
 585                 free(output);
 586                 /* We run INSIDE_MAIN tests for sanity checking. */
 587                 if ((test->style & EXECUTE) || (test->style & INSIDE_MAIN)) {
 588                         output = run("./" OUTPUT_FILE, &status);
 589                         if (!(test->style & EXECUTE) && status != 0)
 590                                 errx(1, "Test for %s failed with %i:\n%s",
 591                                      test->name, status, output);
 592                         if (verbose && status)
 593                                 printf("%s exited %i\n", test->name, status);
 594                         free(output);
 595                 }
 596                 test->answer = (status == 0);
 597         }
 598         test->done = true;
 599
 600         if (test->answer && test->overrides) {
 601                 struct test *override = find_test(test->overrides);
 602                 override->done = true;
 603                 override->answer = true;
 604         }
 605         return test->answer;
 606 }
 607
 608 int main(int argc, const char *argv[])
 609 {
 610         char *cmd;
 611         unsigned int i;
 612         const char *default_args[]
 613                 = { "", DEFAULT_COMPILER, DEFAULT_FLAGS, NULL };
 614
 615         if (argc > 1) {
 616                 if (strcmp(argv[1], "--help") == 0) {
 617                         printf("Usage: configurator [-v] [<compiler> <flags>...]\n"
 618                                "  <compiler> <flags> will have \"-o <outfile> <infile.c>\" appended\n"
 619                                "Default: %s %s\n",
 620                                DEFAULT_COMPILER, DEFAULT_FLAGS);
 621                         exit(0);
 622                 }
 623                 if (strcmp(argv[1], "-v") == 0) {
 624                         argc--;
 625                         argv++;
 626                         verbose = 1;
 627                 } else if (strcmp(argv[1], "-vv") == 0) {
 628                         argc--;
 629                         argv++;
 630                         verbose = 2;
 631                 }
 632         }
 633
 634         if (argc == 1)
 635                 argv = default_args;
 636
 637         cmd = connect_args(argv, " -o " OUTPUT_FILE " " INPUT_FILE);
 638         for (i = 0; i < sizeof(tests)/sizeof(tests[0]); i++)
 639                 run_test(cmd, &tests[i]);
 640         free(cmd);
 641
 642         unlink(OUTPUT_FILE);
 643         unlink(INPUT_FILE);
 644
 645         printf("/* Generated by CCAN configurator */\n"
 646                "#ifndef CCAN_CONFIG_H\n"
 647                "#define CCAN_CONFIG_H\n");
 648         printf("#ifndef _GNU_SOURCE\n");
 649         printf("#define _GNU_SOURCE /* Always use GNU extensions. */\n");
 650         printf("#endif\n");
 651         printf("#define CCAN_COMPILER \"%s\"\n", argv[1]);
 652         cmd = connect_args(argv+1, "");
 653         printf("#define CCAN_CFLAGS \"%s\"\n\n", cmd);
 654         free(cmd);
 655         /* This one implies "#include <ccan/..." works, eg. for tdb2.h */
 656         printf("#define HAVE_CCAN 1\n");
 657         for (i = 0; i < sizeof(tests)/sizeof(tests[0]); i++)
 658                 printf("#define %s %u\n", tests[i].name, tests[i].answer);
 659         printf("#endif /* CCAN_CONFIG_H */\n");
 660         return 0;
 661 }