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 #ifdef _WIN32
  42 #define DIR_SEP   "\\"
  43 #else
  44 #define DIR_SEP   "/"
  45 #endif
  46
  47 static int verbose;
  48
  49 enum test_style {
  50         OUTSIDE_MAIN            = 0x1,
  51         DEFINES_FUNC            = 0x2,
  52         INSIDE_MAIN             = 0x4,
  53         DEFINES_EVERYTHING      = 0x8,
  54         MAY_NOT_COMPILE         = 0x10,
  55         EXECUTE                 = 0x8000
  56 };
  57
  58 struct test {
  59         const char *name;
  60         enum test_style style;
  61         const char *depends;
  62         const char *link;
  63         const char *fragment;
  64         const char *flags;
  65         const char *overrides; /* On success, force this to '1' */
  66         bool done;
  67         bool answer;
  68 };
  69
  70 static struct test tests[] = {
  71         { "HAVE_32BIT_OFF_T", DEFINES_EVERYTHING|EXECUTE|MAY_NOT_COMPILE, NULL, NULL,
  72           "#include <sys/types.h>\n"
  73           "int main(void) {\n"
  74           "     return sizeof(off_t) == 4 ? 0 : 1;\n"
  75           "}\n" },
  76         { "HAVE_ALIGNOF", INSIDE_MAIN, NULL, NULL,
  77           "return __alignof__(double) > 0 ? 0 : 1;" },
  78         { "HAVE_ASPRINTF", DEFINES_FUNC, NULL, NULL,
  79           "#ifndef _GNU_SOURCE\n"
  80           "#define _GNU_SOURCE\n"
  81           "#endif\n"
  82           "#include <stdio.h>\n"
  83           "static char *func(int x) {"
  84           "     char *p;\n"
  85           "     if (asprintf(&p, \"%u\", x) == -1) p = NULL;"
  86           "     return p;\n"
  87           "}" },
  88         { "HAVE_ATTRIBUTE_COLD", DEFINES_FUNC, NULL, NULL,
  89           "static int __attribute__((cold)) func(int x) { return x; }" },
  90         { "HAVE_ATTRIBUTE_CONST", DEFINES_FUNC, NULL, NULL,
  91           "static int __attribute__((const)) func(int x) { return x; }" },
  92         { "HAVE_ATTRIBUTE_PURE", DEFINES_FUNC, NULL, NULL,
  93           "static int __attribute__((pure)) func(int x) { return x; }" },
  94         { "HAVE_ATTRIBUTE_MAY_ALIAS", OUTSIDE_MAIN, NULL, NULL,
  95           "typedef short __attribute__((__may_alias__)) short_a;" },
  96         { "HAVE_ATTRIBUTE_NORETURN", DEFINES_FUNC, NULL, NULL,
  97           "#include <stdlib.h>\n"
  98           "static void __attribute__((noreturn)) func(int x) { exit(x); }" },
  99         { "HAVE_ATTRIBUTE_PRINTF", DEFINES_FUNC, NULL, NULL,
 100           "static void __attribute__((format(__printf__, 1, 2))) func(const char *fmt, ...) { (void)fmt; }" },
 101         { "HAVE_ATTRIBUTE_UNUSED", OUTSIDE_MAIN, NULL, NULL,
 102           "static int __attribute__((unused)) func(int x) { return x; }" },
 103         { "HAVE_ATTRIBUTE_USED", OUTSIDE_MAIN, NULL, NULL,
 104           "static int __attribute__((used)) func(int x) { return x; }" },
 105         { "HAVE_BACKTRACE", DEFINES_FUNC, NULL, NULL,
 106           "#include <execinfo.h>\n"
 107           "static int func(int x) {"
 108           "     void *bt[10];\n"
 109           "     return backtrace(bt, 10) < x;\n"
 110           "}" },
 111         { "HAVE_BIG_ENDIAN", INSIDE_MAIN|EXECUTE, NULL, NULL,
 112           "union { int i; char c[sizeof(int)]; } u;\n"
 113           "u.i = 0x01020304;\n"
 114           "return u.c[0] == 0x01 && u.c[1] == 0x02 && u.c[2] == 0x03 && u.c[3] == 0x04 ? 0 : 1;" },
 115         { "HAVE_BSWAP_64", DEFINES_FUNC, "HAVE_BYTESWAP_H", NULL,
 116           "#include <byteswap.h>\n"
 117           "static int func(int x) { return bswap_64(x); }" },
 118         { "HAVE_BUILTIN_CHOOSE_EXPR", INSIDE_MAIN, NULL, NULL,
 119           "return __builtin_choose_expr(1, 0, \"garbage\");" },
 120         { "HAVE_BUILTIN_CLZ", INSIDE_MAIN, NULL, NULL,
 121           "return __builtin_clz(1) == (sizeof(int)*8 - 1) ? 0 : 1;" },
 122         { "HAVE_BUILTIN_CLZL", INSIDE_MAIN, NULL, NULL,
 123           "return __builtin_clzl(1) == (sizeof(long)*8 - 1) ? 0 : 1;" },
 124         { "HAVE_BUILTIN_CLZLL", INSIDE_MAIN, NULL, NULL,
 125           "return __builtin_clzll(1) == (sizeof(long long)*8 - 1) ? 0 : 1;" },
 126         { "HAVE_BUILTIN_CTZ", INSIDE_MAIN, NULL, NULL,
 127           "return __builtin_ctz(1 << (sizeof(int)*8 - 1)) == (sizeof(int)*8 - 1) ? 0 : 1;" },
 128         { "HAVE_BUILTIN_CTZL", INSIDE_MAIN, NULL, NULL,
 129           "return __builtin_ctzl(1UL << (sizeof(long)*8 - 1)) == (sizeof(long)*8 - 1) ? 0 : 1;" },
 130         { "HAVE_BUILTIN_CTZLL", INSIDE_MAIN, NULL, NULL,
 131           "return __builtin_ctzll(1ULL << (sizeof(long long)*8 - 1)) == (sizeof(long long)*8 - 1) ? 0 : 1;" },
 132         { "HAVE_BUILTIN_CONSTANT_P", INSIDE_MAIN, NULL, NULL,
 133           "return __builtin_constant_p(1) ? 0 : 1;" },
 134         { "HAVE_BUILTIN_EXPECT", INSIDE_MAIN, NULL, NULL,
 135           "return __builtin_expect(argc == 1, 1) ? 0 : 1;" },
 136         { "HAVE_BUILTIN_FFS", INSIDE_MAIN, NULL, NULL,
 137           "return __builtin_ffs(0) == 0 ? 0 : 1;" },
 138         { "HAVE_BUILTIN_FFSL", INSIDE_MAIN, NULL, NULL,
 139           "return __builtin_ffsl(0L) == 0 ? 0 : 1;" },
 140         { "HAVE_BUILTIN_FFSLL", INSIDE_MAIN, NULL, NULL,
 141           "return __builtin_ffsll(0LL) == 0 ? 0 : 1;" },
 142         { "HAVE_BUILTIN_POPCOUNTL", INSIDE_MAIN, NULL, NULL,
 143           "return __builtin_popcountl(255L) == 8 ? 0 : 1;" },
 144         { "HAVE_BUILTIN_TYPES_COMPATIBLE_P", INSIDE_MAIN, NULL, NULL,
 145           "return __builtin_types_compatible_p(char *, int) ? 1 : 0;" },
 146         { "HAVE_ICCARM_INTRINSICS", DEFINES_FUNC, NULL, NULL,
 147           "#include <intrinsics.h>\n"
 148           "int func(int v) {\n"
 149           "     return __CLZ(__RBIT(v));\n"
 150           "}" },
 151         { "HAVE_BYTESWAP_H", OUTSIDE_MAIN, NULL, NULL,
 152           "#include <byteswap.h>\n" },
 153         { "HAVE_CLOCK_GETTIME",
 154           DEFINES_FUNC, "HAVE_STRUCT_TIMESPEC", NULL,
 155           "#include <time.h>\n"
 156           "static struct timespec func(void) {\n"
 157           "     struct timespec ts;\n"
 158           "     clock_gettime(CLOCK_REALTIME, &ts);\n"
 159           "     return ts;\n"
 160           "}\n" },
 161         { "HAVE_CLOCK_GETTIME_IN_LIBRT",
 162           DEFINES_FUNC,
 163           "HAVE_STRUCT_TIMESPEC !HAVE_CLOCK_GETTIME",
 164           "-lrt",
 165           "#include <time.h>\n"
 166           "static struct timespec func(void) {\n"
 167           "     struct timespec ts;\n"
 168           "     clock_gettime(CLOCK_REALTIME, &ts);\n"
 169           "     return ts;\n"
 170           "}\n",
 171           /* This means HAVE_CLOCK_GETTIME, too */
 172           "HAVE_CLOCK_GETTIME" },
 173         { "HAVE_COMPOUND_LITERALS", INSIDE_MAIN, NULL, NULL,
 174           "int *foo = (int[]) { 1, 2, 3, 4 };\n"
 175           "return foo[0] ? 0 : 1;" },
 176         { "HAVE_FCHDIR", DEFINES_EVERYTHING|EXECUTE|MAY_NOT_COMPILE, NULL, NULL,
 177           "#include <sys/types.h>\n"
 178           "#include <sys/stat.h>\n"
 179           "#include <fcntl.h>\n"
 180           "#include <unistd.h>\n"
 181           "int main(void) {\n"
 182           "     int fd = open(\"..\", O_RDONLY);\n"
 183           "     return fchdir(fd) == 0 ? 0 : 1;\n"
 184           "}\n" },
 185         { "HAVE_ERR_H", DEFINES_FUNC, NULL, NULL,
 186           "#include <err.h>\n"
 187           "static void func(int arg) {\n"
 188           "     if (arg == 0)\n"
 189           "             err(1, \"err %u\", arg);\n"
 190           "     if (arg == 1)\n"
 191           "             errx(1, \"err %u\", arg);\n"
 192           "     if (arg == 3)\n"
 193           "             warn(\"warn %u\", arg);\n"
 194           "     if (arg == 4)\n"
 195           "             warnx(\"warn %u\", arg);\n"
 196           "}\n" },
 197         { "HAVE_FILE_OFFSET_BITS", DEFINES_EVERYTHING|EXECUTE|MAY_NOT_COMPILE,
 198           "HAVE_32BIT_OFF_T", NULL,
 199           "#define _FILE_OFFSET_BITS 64\n"
 200           "#include <sys/types.h>\n"
 201           "int main(void) {\n"
 202           "     return sizeof(off_t) == 8 ? 0 : 1;\n"
 203           "}\n" },
 204         { "HAVE_FOR_LOOP_DECLARATION", INSIDE_MAIN, NULL, NULL,
 205           "int ret = 1;\n"
 206           "for (int i = 0; i < argc; i++) { ret = 0; };\n"
 207           "return ret;" },
 208         { "HAVE_FLEXIBLE_ARRAY_MEMBER", OUTSIDE_MAIN, NULL, NULL,
 209           "struct foo { unsigned int x; int arr[]; };" },
 210         { "HAVE_GETPAGESIZE", DEFINES_FUNC, NULL, NULL,
 211           "#include <unistd.h>\n"
 212           "static int func(void) { return getpagesize(); }" },
 213         { "HAVE_ISBLANK", DEFINES_FUNC, NULL, NULL,
 214           "#ifndef _GNU_SOURCE\n"
 215           "#define _GNU_SOURCE\n"
 216           "#endif\n"
 217           "#include <ctype.h>\n"
 218           "static int func(void) { return isblank(' '); }" },
 219         { "HAVE_LITTLE_ENDIAN", INSIDE_MAIN|EXECUTE, NULL, NULL,
 220           "union { int i; char c[sizeof(int)]; } u;\n"
 221           "u.i = 0x01020304;\n"
 222           "return u.c[0] == 0x04 && u.c[1] == 0x03 && u.c[2] == 0x02 && u.c[3] == 0x01 ? 0 : 1;" },
 223         { "HAVE_MEMMEM", DEFINES_FUNC, NULL, NULL,
 224           "#ifndef _GNU_SOURCE\n"
 225           "#define _GNU_SOURCE\n"
 226           "#endif\n"
 227           "#include <string.h>\n"
 228           "static void *func(void *h, size_t hl, void *n, size_t nl) {\n"
 229           "return memmem(h, hl, n, nl);"
 230           "}\n", },
 231         { "HAVE_MEMRCHR", DEFINES_FUNC, NULL, NULL,
 232           "#ifndef _GNU_SOURCE\n"
 233           "#define _GNU_SOURCE\n"
 234           "#endif\n"
 235           "#include <string.h>\n"
 236           "static void *func(void *s, int c, size_t n) {\n"
 237           "return memrchr(s, c, n);"
 238           "}\n", },
 239         { "HAVE_MMAP", DEFINES_FUNC, NULL, NULL,
 240           "#include <sys/mman.h>\n"
 241           "static void *func(int fd) {\n"
 242           "     return mmap(0, 65536, PROT_READ, MAP_SHARED, fd, 0);\n"
 243           "}" },
 244         { "HAVE_PROC_SELF_MAPS", DEFINES_EVERYTHING|EXECUTE|MAY_NOT_COMPILE, NULL, NULL,
 245           "#include <sys/types.h>\n"
 246           "#include <sys/stat.h>\n"
 247           "#include <fcntl.h>\n"
 248           "int main(void) {\n"
 249           "     return open(\"/proc/self/maps\", O_RDONLY) != -1 ? 0 : 1;\n"
 250           "}\n" },
 251         { "HAVE_QSORT_R_PRIVATE_LAST",
 252           DEFINES_EVERYTHING|EXECUTE|MAY_NOT_COMPILE, NULL, NULL,
 253           "#ifndef _GNU_SOURCE\n"
 254           "#define _GNU_SOURCE\n"
 255           "#endif\n"
 256           "#include <stdlib.h>\n"
 257           "static int cmp(const void *lp, const void *rp, void *priv) {\n"
 258           " *(unsigned int *)priv = 1;\n"
 259           " return *(const int *)lp - *(const int *)rp; }\n"
 260           "int main(void) {\n"
 261           " int array[] = { 9, 2, 5 };\n"
 262           " unsigned int called = 0;\n"
 263           " qsort_r(array, 3, sizeof(int), cmp, &called);\n"
 264           " return called && array[0] == 2 && array[1] == 5 && array[2] == 9 ? 0 : 1;\n"
 265           "}\n" },
 266         { "HAVE_STRUCT_TIMESPEC",
 267           DEFINES_FUNC, NULL, NULL,
 268           "#include <time.h>\n"
 269           "static void func(void) {\n"
 270           "     struct timespec ts;\n"
 271           "     ts.tv_sec = ts.tv_nsec = 1;\n"
 272           "}\n" },
 273         { "HAVE_SECTION_START_STOP",
 274           DEFINES_FUNC, NULL, NULL,
 275           "static void *__attribute__((__section__(\"mysec\"))) p = &p;\n"
 276           "static int func(void) {\n"
 277           "     extern void *__start_mysec[], *__stop_mysec[];\n"
 278           "     return __stop_mysec - __start_mysec;\n"
 279           "}\n" },
 280         { "HAVE_STACK_GROWS_UPWARDS", DEFINES_EVERYTHING|EXECUTE, NULL, NULL,
 281           "static long nest(const void *base, unsigned int i)\n"
 282           "{\n"
 283           "     if (i == 0)\n"
 284           "             return (const char *)&i - (const char *)base;\n"
 285           "     return nest(base, i-1);\n"
 286           "}\n"
 287           "int main(int argc, char *argv[]) {\n"
 288           "     (void)argv;\n"
 289           "     return (nest(&argc, argc) > 0) ? 0 : 1;\n"
 290           "}\n" },
 291         { "HAVE_STATEMENT_EXPR", INSIDE_MAIN, NULL, NULL,
 292           "return ({ int x = argc; x == argc ? 0 : 1; });" },
 293         { "HAVE_SYS_FILIO_H", OUTSIDE_MAIN, NULL, NULL, /* Solaris needs this for FIONREAD */
 294           "#include <sys/filio.h>\n" },
 295         { "HAVE_SYS_TERMIOS_H", OUTSIDE_MAIN, NULL, NULL,
 296           "#include <sys/termios.h>\n" },
 297         { "HAVE_TYPEOF", INSIDE_MAIN, NULL, NULL,
 298           "__typeof__(argc) i; i = argc; return i == argc ? 0 : 1;" },
 299         { "HAVE_UNALIGNED_ACCESS", DEFINES_EVERYTHING|EXECUTE, NULL, NULL,
 300           "#include <string.h>\n"
 301           "int main(int argc, char *argv[]) {\n"
 302           "     (void)argc;\n"
 303           "     char pad[sizeof(int *) * 1];\n"
 304           "     strncpy(pad, argv[0], sizeof(pad));\n"
 305           "     int *x = (int *)pad, *y = (int *)(pad + 1);\n"
 306           "     return *x == *y;\n"
 307           "}\n" },
 308         { "HAVE_UTIME", DEFINES_FUNC, NULL, NULL,
 309           "#include <sys/types.h>\n"
 310           "#include <utime.h>\n"
 311           "static int func(const char *filename) {\n"
 312           "     struct utimbuf times = { 0 };\n"
 313           "     return utime(filename, &times);\n"
 314           "}" },
 315         { "HAVE_WARN_UNUSED_RESULT", DEFINES_FUNC, NULL, NULL,
 316           "#include <sys/types.h>\n"
 317           "#include <utime.h>\n"
 318           "static __attribute__((warn_unused_result)) int func(int i) {\n"
 319           "     return i + 1;\n"
 320           "}" },
 321         { "HAVE_OPENMP", INSIDE_MAIN, NULL, NULL,
 322           "int i;\n"
 323           "#pragma omp parallel for\n"
 324           "for(i = 0; i < 0; i++) {};\n"
 325           "return 0;\n",
 326           "-Werror -fopenmp" },
 327         { "HAVE_VALGRIND_MEMCHECK_H", OUTSIDE_MAIN, NULL, NULL,
 328           "#include <valgrind/memcheck.h>\n" },
 329         { "HAVE_UCONTEXT", DEFINES_EVERYTHING|EXECUTE|MAY_NOT_COMPILE,
 330           NULL, NULL,
 331           "#include <ucontext.h>\n"
 332           "static int x = 0;\n"
 333           "static char stack[2048];\n"
 334           "static ucontext_t a, b;\n"
 335           "static void fn(void) {\n"
 336           "     x |= 2;\n"
 337           "     setcontext(&b);\n"
 338           "     x |= 4;\n"
 339           "}\n"
 340           "int main(void) {\n"
 341           "     x |= 1;\n"
 342           "     getcontext(&a);\n"
 343           "     a.uc_stack.ss_sp = stack;\n"
 344           "     a.uc_stack.ss_size = sizeof(stack);\n"
 345           "     makecontext(&a, fn, 0);\n"
 346           "     swapcontext(&b, &a);\n"
 347           "     return (x == 3) ? 0 : 1;\n"
 348           "}\n"
 349         },
 350         { "HAVE_POINTER_SAFE_MAKECONTEXT", DEFINES_EVERYTHING|EXECUTE|MAY_NOT_COMPILE,
 351           "HAVE_UCONTEXT", NULL,
 352           "#include <stddef.h>\n"
 353           "#include <ucontext.h>\n"
 354           "static int worked = 0;\n"
 355           "static char stack[1024];\n"
 356           "static ucontext_t a, b;\n"
 357           "static void fn(void *p, void *q) {\n"
 358           "     void *cp = &worked;\n"
 359           "     void *cq = (void *)(~((ptrdiff_t)cp));\n"
 360           "     if ((p == cp) && (q == cq))\n"
 361           "             worked = 1;\n"
 362           "     setcontext(&b);\n"
 363           "}\n"
 364           "int main(void) {\n"
 365           "     void *ap = &worked;\n"
 366           "     void *aq = (void *)(~((ptrdiff_t)ap));\n"
 367           "     getcontext(&a);\n"
 368           "     a.uc_stack.ss_sp = stack;\n"
 369           "     a.uc_stack.ss_size = sizeof(stack);\n"
 370           "     makecontext(&a, (void (*)(void))fn, 2, ap, aq);\n"
 371           "     swapcontext(&b, &a);\n"
 372           "     return worked ? 0 : 1;\n"
 373           "}\n"
 374         },
 375 };
 376
 377 static char *grab_fd(int fd)
 378 {
 379         int ret;
 380         size_t max, size = 0;
 381         char *buffer;
 382
 383         max = 16384;
 384         buffer = malloc(max+1);
 385         while ((ret = read(fd, buffer + size, max - size)) > 0) {
 386                 size += ret;
 387                 if (size == max)
 388                         buffer = realloc(buffer, max *= 2);
 389         }
 390         if (ret < 0)
 391                 err(1, "reading from command");
 392         buffer[size] = '\0';
 393         return buffer;
 394 }
 395
 396 static char *run(const char *cmd, int *exitstatus)
 397 {
 398         pid_t pid;
 399         int p[2];
 400         char *ret;
 401         int status;
 402
 403         if (pipe(p) != 0)
 404                 err(1, "creating pipe");
 405
 406         pid = fork();
 407         if (pid == -1)
 408                 err(1, "forking");
 409
 410         if (pid == 0) {
 411                 if (dup2(p[1], STDOUT_FILENO) != STDOUT_FILENO
 412                     || dup2(p[1], STDERR_FILENO) != STDERR_FILENO
 413                     || close(p[0]) != 0
 414                     || close(STDIN_FILENO) != 0
 415                     || open("/dev/null", O_RDONLY) != STDIN_FILENO)
 416                         exit(128);
 417
 418                 status = system(cmd);
 419                 if (WIFEXITED(status))
 420                         exit(WEXITSTATUS(status));
 421                 /* Here's a hint... */
 422                 exit(128 + WTERMSIG(status));
 423         }
 424
 425         close(p[1]);
 426         ret = grab_fd(p[0]);
 427         /* This shouldn't fail... */
 428         if (waitpid(pid, &status, 0) != pid)
 429                 err(1, "Failed to wait for child");
 430         close(p[0]);
 431         if (WIFEXITED(status))
 432                 *exitstatus = WEXITSTATUS(status);
 433         else
 434                 *exitstatus = -WTERMSIG(status);
 435         return ret;
 436 }
 437
 438 static char *connect_args(const char *argv[], const char *extra)
 439 {
 440         unsigned int i, len = strlen(extra) + 1;
 441         char *ret;
 442
 443         for (i = 1; argv[i]; i++)
 444                 len += 1 + strlen(argv[i]);
 445
 446         ret = malloc(len);
 447         len = 0;
 448         for (i = 1; argv[i]; i++) {
 449                 strcpy(ret + len, argv[i]);
 450                 len += strlen(argv[i]);
 451                 if (argv[i+1])
 452                         ret[len++] = ' ';
 453         }
 454         strcpy(ret + len, extra);
 455         return ret;
 456 }
 457
 458 static struct test *find_test(const char *name)
 459 {
 460         unsigned int i;
 461
 462         for (i = 0; i < sizeof(tests)/sizeof(tests[0]); i++) {
 463                 if (strcmp(tests[i].name, name) == 0)
 464                         return &tests[i];
 465         }
 466         abort();
 467 }
 468
 469 #define PRE_BOILERPLATE "/* Test program generated by configurator. */\n"
 470 #define MAIN_START_BOILERPLATE \
 471         "int main(int argc, char *argv[]) {\n" \
 472         "       (void)argc;\n" \
 473         "       (void)argv;\n"
 474 #define USE_FUNC_BOILERPLATE "(void)func;\n"
 475 #define MAIN_BODY_BOILERPLATE "return 0;\n"
 476 #define MAIN_END_BOILERPLATE "}\n"
 477
 478 static bool run_test(const char *cmd, struct test *test)
 479 {
 480         char *output, *newcmd;
 481         FILE *outf;
 482         int status;
 483
 484         if (test->done)
 485                 return test->answer;
 486
 487         if (test->depends) {
 488                 size_t len;
 489                 const char *deps = test->depends;
 490                 char *dep;
 491
 492                 /* Space-separated dependencies, could be ! for inverse. */
 493                 while ((len = strcspn(deps, " ")) != 0) {
 494                         bool positive = true;
 495                         if (deps[len]) {
 496                                 dep = strdup(deps);
 497                                 dep[len] = '\0';
 498                         } else {
 499                                 dep = (char *)deps;
 500                         }
 501
 502                         if (dep[0] == '!') {
 503                                 dep++;
 504                                 positive = false;
 505                         }
 506                         if (run_test(cmd, find_test(dep)) != positive) {
 507                                 test->answer = false;
 508                                 test->done = true;
 509                                 return test->answer;
 510                         }
 511                         if (deps[len])
 512                                 free(dep);
 513
 514                         deps += len;
 515                         deps += strspn(deps, " ");
 516                 }
 517         }
 518
 519         outf = fopen(INPUT_FILE, "w");
 520         if (!outf)
 521                 err(1, "creating %s", INPUT_FILE);
 522
 523         fprintf(outf, "%s", PRE_BOILERPLATE);
 524         switch (test->style & ~(EXECUTE|MAY_NOT_COMPILE)) {
 525         case INSIDE_MAIN:
 526                 fprintf(outf, "%s", MAIN_START_BOILERPLATE);
 527                 fprintf(outf, "%s", test->fragment);
 528                 fprintf(outf, "%s", MAIN_END_BOILERPLATE);
 529                 break;
 530         case OUTSIDE_MAIN:
 531                 fprintf(outf, "%s", test->fragment);
 532                 fprintf(outf, "%s", MAIN_START_BOILERPLATE);
 533                 fprintf(outf, "%s", MAIN_BODY_BOILERPLATE);
 534                 fprintf(outf, "%s", MAIN_END_BOILERPLATE);
 535                 break;
 536         case DEFINES_FUNC:
 537                 fprintf(outf, "%s", test->fragment);
 538                 fprintf(outf, "%s", MAIN_START_BOILERPLATE);
 539                 fprintf(outf, "%s", USE_FUNC_BOILERPLATE);
 540                 fprintf(outf, "%s", MAIN_BODY_BOILERPLATE);
 541                 fprintf(outf, "%s", MAIN_END_BOILERPLATE);
 542                 break;
 543         case DEFINES_EVERYTHING:
 544                 fprintf(outf, "%s", test->fragment);
 545                 break;
 546         default:
 547                 abort();
 548
 549         }
 550         fclose(outf);
 551
 552         if (verbose > 1)
 553                 if (system("cat " INPUT_FILE) == -1)
 554                         ;
 555
 556         newcmd = strdup(cmd);
 557
 558         if (test->flags) {
 559                 newcmd = realloc(newcmd, strlen(newcmd) + strlen(" ")
 560                                 + strlen(test->flags) + 1);
 561                 strcat(newcmd, " ");
 562                 strcat(newcmd, test->flags);
 563                 if (verbose > 1)
 564                         printf("Extra flags line: %s", newcmd);
 565         }
 566
 567         if (test->link) {
 568                 newcmd = realloc(newcmd, strlen(newcmd) + strlen(" ")
 569                                 + strlen(test->link) + 1);
 570                 strcat(newcmd, " ");
 571                 strcat(newcmd, test->link);
 572                 if (verbose > 1)
 573                         printf("Extra link line: %s", newcmd);
 574         }
 575
 576         output = run(newcmd, &status);
 577
 578         free(newcmd);
 579
 580         if (status != 0 || strstr(output, "warning")) {
 581                 if (verbose)
 582                         printf("Compile %s for %s, status %i: %s\n",
 583                                status ? "fail" : "warning",
 584                                test->name, status, output);
 585                 if ((test->style & EXECUTE) && !(test->style & MAY_NOT_COMPILE))
 586                         errx(1, "Test for %s did not compile:\n%s",
 587                              test->name, output);
 588                 test->answer = false;
 589                 free(output);
 590         } else {
 591                 /* Compile succeeded. */
 592                 free(output);
 593                 /* We run INSIDE_MAIN tests for sanity checking. */
 594                 if ((test->style & EXECUTE) || (test->style & INSIDE_MAIN)) {
 595                         output = run("." DIR_SEP OUTPUT_FILE, &status);
 596                         if (!(test->style & EXECUTE) && status != 0)
 597                                 errx(1, "Test for %s failed with %i:\n%s",
 598                                      test->name, status, output);
 599                         if (verbose && status)
 600                                 printf("%s exited %i\n", test->name, status);
 601                         free(output);
 602                 }
 603                 test->answer = (status == 0);
 604         }
 605         test->done = true;
 606
 607         if (test->answer && test->overrides) {
 608                 struct test *override = find_test(test->overrides);
 609                 override->done = true;
 610                 override->answer = true;
 611         }
 612         return test->answer;
 613 }
 614
 615 int main(int argc, const char *argv[])
 616 {
 617         char *cmd;
 618         unsigned int i;
 619         const char *default_args[]
 620                 = { "", DEFAULT_COMPILER, DEFAULT_FLAGS, NULL };
 621
 622         if (argc > 1) {
 623                 if (strcmp(argv[1], "--help") == 0) {
 624                         printf("Usage: configurator [-v] [<compiler> <flags>...]\n"
 625                                "  <compiler> <flags> will have \"-o <outfile> <infile.c>\" appended\n"
 626                                "Default: %s %s\n",
 627                                DEFAULT_COMPILER, DEFAULT_FLAGS);
 628                         exit(0);
 629                 }
 630                 if (strcmp(argv[1], "-v") == 0) {
 631                         argc--;
 632                         argv++;
 633                         verbose = 1;
 634                 } else if (strcmp(argv[1], "-vv") == 0) {
 635                         argc--;
 636                         argv++;
 637                         verbose = 2;
 638                 }
 639         }
 640
 641         if (argc == 1)
 642                 argv = default_args;
 643
 644         cmd = connect_args(argv, " -o " OUTPUT_FILE " " INPUT_FILE);
 645         for (i = 0; i < sizeof(tests)/sizeof(tests[0]); i++)
 646                 run_test(cmd, &tests[i]);
 647         free(cmd);
 648
 649         remove(OUTPUT_FILE);
 650         remove(INPUT_FILE);
 651
 652         printf("/* Generated by CCAN configurator */\n"
 653                "#ifndef CCAN_CONFIG_H\n"
 654                "#define CCAN_CONFIG_H\n");
 655         printf("#ifndef _GNU_SOURCE\n");
 656         printf("#define _GNU_SOURCE /* Always use GNU extensions. */\n");
 657         printf("#endif\n");
 658         printf("#define CCAN_COMPILER \"%s\"\n", argv[1]);
 659         cmd = connect_args(argv+1, "");
 660         printf("#define CCAN_CFLAGS \"%s\"\n\n", cmd);
 661         free(cmd);
 662         /* This one implies "#include <ccan/..." works, eg. for tdb2.h */
 663         printf("#define HAVE_CCAN 1\n");
 664         for (i = 0; i < sizeof(tests)/sizeof(tests[0]); i++)
 665                 printf("#define %s %u\n", tests[i].name, tests[i].answer);
 666         printf("#endif /* CCAN_CONFIG_H */\n");
 667         return 0;
 668 }