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  * c12r_err, c12r_errx functions copied from ccan/err/err.c
   7  * Copyright Rusty Russell <rusty@rustcorp.com.au>. CC0 (Public domain) License.
   8  *
   9  * Permission is hereby granted, free of charge, to any person obtaining a copy
  10  * of this software and associated documentation files (the "Software"), to deal
  11  * in the Software without restriction, including without limitation the rights
  12  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  13  * copies of the Software, and to permit persons to whom the Software is
  14  * furnished to do so, subject to the following conditions:
  15  *
  16  * The above copyright notice and this permission notice shall be included in
  17  * all copies or substantial portions of the Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  20  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  21  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  22  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  23  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  24  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  25  * THE SOFTWARE.
  26  */
  27 #define _POSIX_C_SOURCE 200809L                /* For pclose, popen, strdup */
  28
  29 #include <errno.h>
  30 #include <stdio.h>
  31 #include <stdarg.h>
  32 #include <stdbool.h>
  33 #include <stdlib.h>
  34 #include <string.h>
  35
  36 #ifdef _MSC_VER
  37 #define popen _popen
  38 #define pclose _pclose
  39 #endif
  40
  41 #define DEFAULT_COMPILER "cc"
  42 #define DEFAULT_FLAGS "-g3 -ggdb -Wall -Wundef -Wmissing-prototypes -Wmissing-declarations -Wstrict-prototypes -Wold-style-definition"
  43
  44 #define OUTPUT_FILE "configurator.out"
  45 #define INPUT_FILE "configuratortest.c"
  46
  47 #ifdef _WIN32
  48 #define DIR_SEP   "\\"
  49 #else
  50 #define DIR_SEP   "/"
  51 #endif
  52
  53 static const char *progname = "";
  54 static int verbose;
  55
  56 enum test_style {
  57         OUTSIDE_MAIN            = 0x1,
  58         DEFINES_FUNC            = 0x2,
  59         INSIDE_MAIN             = 0x4,
  60         DEFINES_EVERYTHING      = 0x8,
  61         MAY_NOT_COMPILE         = 0x10,
  62         EXECUTE                 = 0x8000
  63 };
  64
  65 struct test {
  66         const char *name;
  67         enum test_style style;
  68         const char *depends;
  69         const char *link;
  70         const char *fragment;
  71         const char *flags;
  72         const char *overrides; /* On success, force this to '1' */
  73         bool done;
  74         bool answer;
  75 };
  76
  77 static struct test tests[] = {
  78         { "HAVE_32BIT_OFF_T", DEFINES_EVERYTHING|EXECUTE|MAY_NOT_COMPILE, NULL, NULL,
  79           "#include <sys/types.h>\n"
  80           "int main(void) {\n"
  81           "     return sizeof(off_t) == 4 ? 0 : 1;\n"
  82           "}\n" },
  83         { "HAVE_ALIGNOF", INSIDE_MAIN, NULL, NULL,
  84           "return __alignof__(double) > 0 ? 0 : 1;" },
  85         { "HAVE_ASPRINTF", DEFINES_FUNC, NULL, NULL,
  86           "#ifndef _GNU_SOURCE\n"
  87           "#define _GNU_SOURCE\n"
  88           "#endif\n"
  89           "#include <stdio.h>\n"
  90           "static char *func(int x) {"
  91           "     char *p;\n"
  92           "     if (asprintf(&p, \"%u\", x) == -1) p = NULL;"
  93           "     return p;\n"
  94           "}" },
  95         { "HAVE_ATTRIBUTE_COLD", DEFINES_FUNC, NULL, NULL,
  96           "static int __attribute__((cold)) func(int x) { return x; }" },
  97         { "HAVE_ATTRIBUTE_CONST", DEFINES_FUNC, NULL, NULL,
  98           "static int __attribute__((const)) func(int x) { return x; }" },
  99         { "HAVE_ATTRIBUTE_PURE", DEFINES_FUNC, NULL, NULL,
 100           "static int __attribute__((pure)) func(int x) { return x; }" },
 101         { "HAVE_ATTRIBUTE_MAY_ALIAS", OUTSIDE_MAIN, NULL, NULL,
 102           "typedef short __attribute__((__may_alias__)) short_a;" },
 103         { "HAVE_ATTRIBUTE_NORETURN", DEFINES_FUNC, NULL, NULL,
 104           "#include <stdlib.h>\n"
 105           "static void __attribute__((noreturn)) func(int x) { exit(x); }" },
 106         { "HAVE_ATTRIBUTE_PRINTF", DEFINES_FUNC, NULL, NULL,
 107           "static void __attribute__((format(__printf__, 1, 2))) func(const char *fmt, ...) { (void)fmt; }" },
 108         { "HAVE_ATTRIBUTE_UNUSED", OUTSIDE_MAIN, NULL, NULL,
 109           "static int __attribute__((unused)) func(int x) { return x; }" },
 110         { "HAVE_ATTRIBUTE_USED", OUTSIDE_MAIN, NULL, NULL,
 111           "static int __attribute__((used)) func(int x) { return x; }" },
 112         { "HAVE_BACKTRACE", DEFINES_FUNC, NULL, NULL,
 113           "#include <execinfo.h>\n"
 114           "static int func(int x) {"
 115           "     void *bt[10];\n"
 116           "     return backtrace(bt, 10) < x;\n"
 117           "}" },
 118         { "HAVE_BIG_ENDIAN", INSIDE_MAIN|EXECUTE, NULL, NULL,
 119           "union { int i; char c[sizeof(int)]; } u;\n"
 120           "u.i = 0x01020304;\n"
 121           "return u.c[0] == 0x01 && u.c[1] == 0x02 && u.c[2] == 0x03 && u.c[3] == 0x04 ? 0 : 1;" },
 122         { "HAVE_BSWAP_64", DEFINES_FUNC, "HAVE_BYTESWAP_H", NULL,
 123           "#include <byteswap.h>\n"
 124           "static int func(int x) { return bswap_64(x); }" },
 125         { "HAVE_BUILTIN_CHOOSE_EXPR", INSIDE_MAIN, NULL, NULL,
 126           "return __builtin_choose_expr(1, 0, \"garbage\");" },
 127         { "HAVE_BUILTIN_CLZ", INSIDE_MAIN, NULL, NULL,
 128           "return __builtin_clz(1) == (sizeof(int)*8 - 1) ? 0 : 1;" },
 129         { "HAVE_BUILTIN_CLZL", INSIDE_MAIN, NULL, NULL,
 130           "return __builtin_clzl(1) == (sizeof(long)*8 - 1) ? 0 : 1;" },
 131         { "HAVE_BUILTIN_CLZLL", INSIDE_MAIN, NULL, NULL,
 132           "return __builtin_clzll(1) == (sizeof(long long)*8 - 1) ? 0 : 1;" },
 133         { "HAVE_BUILTIN_CTZ", INSIDE_MAIN, NULL, NULL,
 134           "return __builtin_ctz(1 << (sizeof(int)*8 - 1)) == (sizeof(int)*8 - 1) ? 0 : 1;" },
 135         { "HAVE_BUILTIN_CTZL", INSIDE_MAIN, NULL, NULL,
 136           "return __builtin_ctzl(1UL << (sizeof(long)*8 - 1)) == (sizeof(long)*8 - 1) ? 0 : 1;" },
 137         { "HAVE_BUILTIN_CTZLL", INSIDE_MAIN, NULL, NULL,
 138           "return __builtin_ctzll(1ULL << (sizeof(long long)*8 - 1)) == (sizeof(long long)*8 - 1) ? 0 : 1;" },
 139         { "HAVE_BUILTIN_CONSTANT_P", INSIDE_MAIN, NULL, NULL,
 140           "return __builtin_constant_p(1) ? 0 : 1;" },
 141         { "HAVE_BUILTIN_EXPECT", INSIDE_MAIN, NULL, NULL,
 142           "return __builtin_expect(argc == 1, 1) ? 0 : 1;" },
 143         { "HAVE_BUILTIN_FFS", INSIDE_MAIN, NULL, NULL,
 144           "return __builtin_ffs(0) == 0 ? 0 : 1;" },
 145         { "HAVE_BUILTIN_FFSL", INSIDE_MAIN, NULL, NULL,
 146           "return __builtin_ffsl(0L) == 0 ? 0 : 1;" },
 147         { "HAVE_BUILTIN_FFSLL", INSIDE_MAIN, NULL, NULL,
 148           "return __builtin_ffsll(0LL) == 0 ? 0 : 1;" },
 149         { "HAVE_BUILTIN_POPCOUNTL", INSIDE_MAIN, NULL, NULL,
 150           "return __builtin_popcountl(255L) == 8 ? 0 : 1;" },
 151         { "HAVE_BUILTIN_TYPES_COMPATIBLE_P", INSIDE_MAIN, NULL, NULL,
 152           "return __builtin_types_compatible_p(char *, int) ? 1 : 0;" },
 153         { "HAVE_ICCARM_INTRINSICS", DEFINES_FUNC, NULL, NULL,
 154           "#include <intrinsics.h>\n"
 155           "int func(int v) {\n"
 156           "     return __CLZ(__RBIT(v));\n"
 157           "}" },
 158         { "HAVE_BYTESWAP_H", OUTSIDE_MAIN, NULL, NULL,
 159           "#include <byteswap.h>\n" },
 160         { "HAVE_CLOCK_GETTIME",
 161           DEFINES_FUNC, "HAVE_STRUCT_TIMESPEC", NULL,
 162           "#include <time.h>\n"
 163           "static struct timespec func(void) {\n"
 164           "     struct timespec ts;\n"
 165           "     clock_gettime(CLOCK_REALTIME, &ts);\n"
 166           "     return ts;\n"
 167           "}\n" },
 168         { "HAVE_CLOCK_GETTIME_IN_LIBRT",
 169           DEFINES_FUNC,
 170           "HAVE_STRUCT_TIMESPEC !HAVE_CLOCK_GETTIME",
 171           "-lrt",
 172           "#include <time.h>\n"
 173           "static struct timespec func(void) {\n"
 174           "     struct timespec ts;\n"
 175           "     clock_gettime(CLOCK_REALTIME, &ts);\n"
 176           "     return ts;\n"
 177           "}\n",
 178           /* This means HAVE_CLOCK_GETTIME, too */
 179           "HAVE_CLOCK_GETTIME" },
 180         { "HAVE_COMPOUND_LITERALS", INSIDE_MAIN, NULL, NULL,
 181           "int *foo = (int[]) { 1, 2, 3, 4 };\n"
 182           "return foo[0] ? 0 : 1;" },
 183         { "HAVE_FCHDIR", DEFINES_EVERYTHING|EXECUTE|MAY_NOT_COMPILE, NULL, NULL,
 184           "#include <sys/types.h>\n"
 185           "#include <sys/stat.h>\n"
 186           "#include <fcntl.h>\n"
 187           "#include <unistd.h>\n"
 188           "int main(void) {\n"
 189           "     int fd = open(\"..\", O_RDONLY);\n"
 190           "     return fchdir(fd) == 0 ? 0 : 1;\n"
 191           "}\n" },
 192         { "HAVE_ERR_H", DEFINES_FUNC, NULL, NULL,
 193           "#include <err.h>\n"
 194           "static void func(int arg) {\n"
 195           "     if (arg == 0)\n"
 196           "             err(1, \"err %u\", arg);\n"
 197           "     if (arg == 1)\n"
 198           "             errx(1, \"err %u\", arg);\n"
 199           "     if (arg == 3)\n"
 200           "             warn(\"warn %u\", arg);\n"
 201           "     if (arg == 4)\n"
 202           "             warnx(\"warn %u\", arg);\n"
 203           "}\n" },
 204         { "HAVE_FILE_OFFSET_BITS", DEFINES_EVERYTHING|EXECUTE|MAY_NOT_COMPILE,
 205           "HAVE_32BIT_OFF_T", NULL,
 206           "#define _FILE_OFFSET_BITS 64\n"
 207           "#include <sys/types.h>\n"
 208           "int main(void) {\n"
 209           "     return sizeof(off_t) == 8 ? 0 : 1;\n"
 210           "}\n" },
 211         { "HAVE_FOR_LOOP_DECLARATION", INSIDE_MAIN, NULL, NULL,
 212           "int ret = 1;\n"
 213           "for (int i = 0; i < argc; i++) { ret = 0; };\n"
 214           "return ret;" },
 215         { "HAVE_FLEXIBLE_ARRAY_MEMBER", OUTSIDE_MAIN, NULL, NULL,
 216           "struct foo { unsigned int x; int arr[]; };" },
 217         { "HAVE_GETPAGESIZE", DEFINES_FUNC, NULL, NULL,
 218           "#include <unistd.h>\n"
 219           "static int func(void) { return getpagesize(); }" },
 220         { "HAVE_ISBLANK", DEFINES_FUNC, NULL, NULL,
 221           "#ifndef _GNU_SOURCE\n"
 222           "#define _GNU_SOURCE\n"
 223           "#endif\n"
 224           "#include <ctype.h>\n"
 225           "static int func(void) { return isblank(' '); }" },
 226         { "HAVE_LITTLE_ENDIAN", INSIDE_MAIN|EXECUTE, NULL, NULL,
 227           "union { int i; char c[sizeof(int)]; } u;\n"
 228           "u.i = 0x01020304;\n"
 229           "return u.c[0] == 0x04 && u.c[1] == 0x03 && u.c[2] == 0x02 && u.c[3] == 0x01 ? 0 : 1;" },
 230         { "HAVE_MEMMEM", DEFINES_FUNC, NULL, NULL,
 231           "#ifndef _GNU_SOURCE\n"
 232           "#define _GNU_SOURCE\n"
 233           "#endif\n"
 234           "#include <string.h>\n"
 235           "static void *func(void *h, size_t hl, void *n, size_t nl) {\n"
 236           "return memmem(h, hl, n, nl);"
 237           "}\n", },
 238         { "HAVE_MEMRCHR", DEFINES_FUNC, NULL, NULL,
 239           "#ifndef _GNU_SOURCE\n"
 240           "#define _GNU_SOURCE\n"
 241           "#endif\n"
 242           "#include <string.h>\n"
 243           "static void *func(void *s, int c, size_t n) {\n"
 244           "return memrchr(s, c, n);"
 245           "}\n", },
 246         { "HAVE_MMAP", DEFINES_FUNC, NULL, NULL,
 247           "#include <sys/mman.h>\n"
 248           "static void *func(int fd) {\n"
 249           "     return mmap(0, 65536, PROT_READ, MAP_SHARED, fd, 0);\n"
 250           "}" },
 251         { "HAVE_PROC_SELF_MAPS", DEFINES_EVERYTHING|EXECUTE|MAY_NOT_COMPILE, NULL, NULL,
 252           "#include <sys/types.h>\n"
 253           "#include <sys/stat.h>\n"
 254           "#include <fcntl.h>\n"
 255           "int main(void) {\n"
 256           "     return open(\"/proc/self/maps\", O_RDONLY) != -1 ? 0 : 1;\n"
 257           "}\n" },
 258         { "HAVE_QSORT_R_PRIVATE_LAST",
 259           DEFINES_EVERYTHING|EXECUTE|MAY_NOT_COMPILE, NULL, NULL,
 260           "#ifndef _GNU_SOURCE\n"
 261           "#define _GNU_SOURCE\n"
 262           "#endif\n"
 263           "#include <stdlib.h>\n"
 264           "static int cmp(const void *lp, const void *rp, void *priv) {\n"
 265           " *(unsigned int *)priv = 1;\n"
 266           " return *(const int *)lp - *(const int *)rp; }\n"
 267           "int main(void) {\n"
 268           " int array[] = { 9, 2, 5 };\n"
 269           " unsigned int called = 0;\n"
 270           " qsort_r(array, 3, sizeof(int), cmp, &called);\n"
 271           " return called && array[0] == 2 && array[1] == 5 && array[2] == 9 ? 0 : 1;\n"
 272           "}\n" },
 273         { "HAVE_STRUCT_TIMESPEC",
 274           DEFINES_FUNC, NULL, NULL,
 275           "#include <time.h>\n"
 276           "static void func(void) {\n"
 277           "     struct timespec ts;\n"
 278           "     ts.tv_sec = ts.tv_nsec = 1;\n"
 279           "}\n" },
 280         { "HAVE_SECTION_START_STOP",
 281           DEFINES_FUNC, NULL, NULL,
 282           "static void *__attribute__((__section__(\"mysec\"))) p = &p;\n"
 283           "static int func(void) {\n"
 284           "     extern void *__start_mysec[], *__stop_mysec[];\n"
 285           "     return __stop_mysec - __start_mysec;\n"
 286           "}\n" },
 287         { "HAVE_STACK_GROWS_UPWARDS", DEFINES_EVERYTHING|EXECUTE, NULL, NULL,
 288           "#include <stddef.h>\n"
 289           "static ptrdiff_t nest(const void *base, unsigned int i)\n"
 290           "{\n"
 291           "     if (i == 0)\n"
 292           "             return (const char *)&i - (const char *)base;\n"
 293           "     return nest(base, i-1);\n"
 294           "}\n"
 295           "int main(int argc, char *argv[]) {\n"
 296           "     (void)argv;\n"
 297           "     return (nest(&argc, argc) > 0) ? 0 : 1;\n"
 298           "}\n" },
 299         { "HAVE_STATEMENT_EXPR", INSIDE_MAIN, NULL, NULL,
 300           "return ({ int x = argc; x == argc ? 0 : 1; });" },
 301         { "HAVE_SYS_FILIO_H", OUTSIDE_MAIN, NULL, NULL, /* Solaris needs this for FIONREAD */
 302           "#include <sys/filio.h>\n" },
 303         { "HAVE_SYS_TERMIOS_H", OUTSIDE_MAIN, NULL, NULL,
 304           "#include <sys/termios.h>\n" },
 305         { "HAVE_TYPEOF", INSIDE_MAIN, NULL, NULL,
 306           "__typeof__(argc) i; i = argc; return i == argc ? 0 : 1;" },
 307         { "HAVE_UNALIGNED_ACCESS", DEFINES_EVERYTHING|EXECUTE, NULL, NULL,
 308           "#include <string.h>\n"
 309           "int main(int argc, char *argv[]) {\n"
 310           "     (void)argc;\n"
 311           "     char pad[sizeof(int *) * 1];\n"
 312           "     strncpy(pad, argv[0], sizeof(pad));\n"
 313           "     int *x = (int *)pad, *y = (int *)(pad + 1);\n"
 314           "     return *x == *y;\n"
 315           "}\n" },
 316         { "HAVE_UTIME", DEFINES_FUNC, NULL, NULL,
 317           "#include <sys/types.h>\n"
 318           "#include <utime.h>\n"
 319           "static int func(const char *filename) {\n"
 320           "     struct utimbuf times = { 0 };\n"
 321           "     return utime(filename, &times);\n"
 322           "}" },
 323         { "HAVE_WARN_UNUSED_RESULT", DEFINES_FUNC, NULL, NULL,
 324           "#include <sys/types.h>\n"
 325           "#include <utime.h>\n"
 326           "static __attribute__((warn_unused_result)) int func(int i) {\n"
 327           "     return i + 1;\n"
 328           "}" },
 329         { "HAVE_OPENMP", INSIDE_MAIN, NULL, NULL,
 330           "int i;\n"
 331           "#pragma omp parallel for\n"
 332           "for(i = 0; i < 0; i++) {};\n"
 333           "return 0;\n",
 334           "-Werror -fopenmp" },
 335         { "HAVE_VALGRIND_MEMCHECK_H", OUTSIDE_MAIN, NULL, NULL,
 336           "#include <valgrind/memcheck.h>\n" },
 337         { "HAVE_UCONTEXT", DEFINES_EVERYTHING|EXECUTE|MAY_NOT_COMPILE,
 338           NULL, NULL,
 339           "#include <ucontext.h>\n"
 340           "static int x = 0;\n"
 341           "static char stack[2048];\n"
 342           "static ucontext_t a, b;\n"
 343           "static void fn(void) {\n"
 344           "     x |= 2;\n"
 345           "     setcontext(&b);\n"
 346           "     x |= 4;\n"
 347           "}\n"
 348           "int main(void) {\n"
 349           "     x |= 1;\n"
 350           "     getcontext(&a);\n"
 351           "     a.uc_stack.ss_sp = stack;\n"
 352           "     a.uc_stack.ss_size = sizeof(stack);\n"
 353           "     makecontext(&a, fn, 0);\n"
 354           "     swapcontext(&b, &a);\n"
 355           "     return (x == 3) ? 0 : 1;\n"
 356           "}\n"
 357         },
 358         { "HAVE_POINTER_SAFE_MAKECONTEXT", DEFINES_EVERYTHING|EXECUTE|MAY_NOT_COMPILE,
 359           "HAVE_UCONTEXT", NULL,
 360           "#include <stddef.h>\n"
 361           "#include <ucontext.h>\n"
 362           "static int worked = 0;\n"
 363           "static char stack[1024];\n"
 364           "static ucontext_t a, b;\n"
 365           "static void fn(void *p, void *q) {\n"
 366           "     void *cp = &worked;\n"
 367           "     void *cq = (void *)(~((ptrdiff_t)cp));\n"
 368           "     if ((p == cp) && (q == cq))\n"
 369           "             worked = 1;\n"
 370           "     setcontext(&b);\n"
 371           "}\n"
 372           "int main(void) {\n"
 373           "     void *ap = &worked;\n"
 374           "     void *aq = (void *)(~((ptrdiff_t)ap));\n"
 375           "     getcontext(&a);\n"
 376           "     a.uc_stack.ss_sp = stack;\n"
 377           "     a.uc_stack.ss_size = sizeof(stack);\n"
 378           "     makecontext(&a, (void (*)(void))fn, 2, ap, aq);\n"
 379           "     swapcontext(&b, &a);\n"
 380           "     return worked ? 0 : 1;\n"
 381           "}\n"
 382         },
 383 };
 384
 385 static void c12r_err(int eval, const char *fmt, ...)
 386 {
 387         int err_errno = errno;
 388         va_list ap;
 389
 390         fprintf(stderr, "%s: ", progname);
 391         va_start(ap, fmt);
 392         vfprintf(stderr, fmt, ap);
 393         va_end(ap);
 394         fprintf(stderr, ": %s\n", strerror(err_errno));
 395         exit(eval);
 396 }
 397
 398 static void c12r_errx(int eval, const char *fmt, ...)
 399 {
 400         va_list ap;
 401
 402         fprintf(stderr, "%s: ", progname);
 403         va_start(ap, fmt);
 404         vfprintf(stderr, fmt, ap);
 405         va_end(ap);
 406         fprintf(stderr, "\n");
 407         exit(eval);
 408 }
 409
 410 static char *grab_stream(FILE *file)
 411 {
 412         size_t max, ret, size = 0;
 413         char *buffer;
 414
 415         max = BUFSIZ;
 416         buffer = malloc(max);
 417         while ((ret = fread(buffer+size, 1, max - size, file)) == max - size) {
 418                 size += ret;
 419                 buffer = realloc(buffer, max *= 2);
 420         }
 421         size += ret;
 422         if (ferror(file))
 423                 c12r_err(1, "reading from command");
 424         buffer[size] = '\0';
 425         return buffer;
 426 }
 427
 428 static char *run(const char *cmd, int *exitstatus)
 429 {
 430         static const char redir[] = " 2>&1";
 431         size_t cmdlen;
 432         char *cmdredir;
 433         FILE *cmdout;
 434         char *ret;
 435
 436         cmdlen = strlen(cmd);
 437         cmdredir = malloc(cmdlen + sizeof(redir));
 438         memcpy(cmdredir, cmd, cmdlen);
 439         memcpy(cmdredir + cmdlen, redir, sizeof(redir));
 440
 441         cmdout = popen(cmdredir, "r");
 442         if (!cmdout)
 443                 c12r_err(1, "popen \"%s\"", cmdredir);
 444
 445         free(cmdredir);
 446
 447         ret = grab_stream(cmdout);
 448         *exitstatus = pclose(cmdout);
 449         return ret;
 450 }
 451
 452 static char *connect_args(const char *argv[], const char *extra)
 453 {
 454         unsigned int i, len = strlen(extra) + 1;
 455         char *ret;
 456
 457         for (i = 1; argv[i]; i++)
 458                 len += 1 + strlen(argv[i]);
 459
 460         ret = malloc(len);
 461         len = 0;
 462         for (i = 1; argv[i]; i++) {
 463                 strcpy(ret + len, argv[i]);
 464                 len += strlen(argv[i]);
 465                 if (argv[i+1])
 466                         ret[len++] = ' ';
 467         }
 468         strcpy(ret + len, extra);
 469         return ret;
 470 }
 471
 472 static struct test *find_test(const char *name)
 473 {
 474         unsigned int i;
 475
 476         for (i = 0; i < sizeof(tests)/sizeof(tests[0]); i++) {
 477                 if (strcmp(tests[i].name, name) == 0)
 478                         return &tests[i];
 479         }
 480         abort();
 481 }
 482
 483 #define PRE_BOILERPLATE "/* Test program generated by configurator. */\n"
 484 #define MAIN_START_BOILERPLATE \
 485         "int main(int argc, char *argv[]) {\n" \
 486         "       (void)argc;\n" \
 487         "       (void)argv;\n"
 488 #define USE_FUNC_BOILERPLATE "(void)func;\n"
 489 #define MAIN_BODY_BOILERPLATE "return 0;\n"
 490 #define MAIN_END_BOILERPLATE "}\n"
 491
 492 static bool run_test(const char *cmd, struct test *test)
 493 {
 494         char *output, *newcmd;
 495         FILE *outf;
 496         int status;
 497
 498         if (test->done)
 499                 return test->answer;
 500
 501         if (test->depends) {
 502                 size_t len;
 503                 const char *deps = test->depends;
 504                 char *dep;
 505
 506                 /* Space-separated dependencies, could be ! for inverse. */
 507                 while ((len = strcspn(deps, " ")) != 0) {
 508                         bool positive = true;
 509                         if (deps[len]) {
 510                                 dep = strdup(deps);
 511                                 dep[len] = '\0';
 512                         } else {
 513                                 dep = (char *)deps;
 514                         }
 515
 516                         if (dep[0] == '!') {
 517                                 dep++;
 518                                 positive = false;
 519                         }
 520                         if (run_test(cmd, find_test(dep)) != positive) {
 521                                 test->answer = false;
 522                                 test->done = true;
 523                                 return test->answer;
 524                         }
 525                         if (deps[len])
 526                                 free(dep);
 527
 528                         deps += len;
 529                         deps += strspn(deps, " ");
 530                 }
 531         }
 532
 533         outf = fopen(INPUT_FILE, "w");
 534         if (!outf)
 535                 c12r_err(1, "creating %s", INPUT_FILE);
 536
 537         fprintf(outf, "%s", PRE_BOILERPLATE);
 538         switch (test->style & ~(EXECUTE|MAY_NOT_COMPILE)) {
 539         case INSIDE_MAIN:
 540                 fprintf(outf, "%s", MAIN_START_BOILERPLATE);
 541                 fprintf(outf, "%s", test->fragment);
 542                 fprintf(outf, "%s", MAIN_END_BOILERPLATE);
 543                 break;
 544         case OUTSIDE_MAIN:
 545                 fprintf(outf, "%s", test->fragment);
 546                 fprintf(outf, "%s", MAIN_START_BOILERPLATE);
 547                 fprintf(outf, "%s", MAIN_BODY_BOILERPLATE);
 548                 fprintf(outf, "%s", MAIN_END_BOILERPLATE);
 549                 break;
 550         case DEFINES_FUNC:
 551                 fprintf(outf, "%s", test->fragment);
 552                 fprintf(outf, "%s", MAIN_START_BOILERPLATE);
 553                 fprintf(outf, "%s", USE_FUNC_BOILERPLATE);
 554                 fprintf(outf, "%s", MAIN_BODY_BOILERPLATE);
 555                 fprintf(outf, "%s", MAIN_END_BOILERPLATE);
 556                 break;
 557         case DEFINES_EVERYTHING:
 558                 fprintf(outf, "%s", test->fragment);
 559                 break;
 560         default:
 561                 abort();
 562
 563         }
 564         fclose(outf);
 565
 566         if (verbose > 1)
 567                 if (system("cat " INPUT_FILE) == -1)
 568                         ;
 569
 570         newcmd = strdup(cmd);
 571
 572         if (test->flags) {
 573                 newcmd = realloc(newcmd, strlen(newcmd) + strlen(" ")
 574                                 + strlen(test->flags) + 1);
 575                 strcat(newcmd, " ");
 576                 strcat(newcmd, test->flags);
 577                 if (verbose > 1)
 578                         printf("Extra flags line: %s", newcmd);
 579         }
 580
 581         if (test->link) {
 582                 newcmd = realloc(newcmd, strlen(newcmd) + strlen(" ")
 583                                 + strlen(test->link) + 1);
 584                 strcat(newcmd, " ");
 585                 strcat(newcmd, test->link);
 586                 if (verbose > 1)
 587                         printf("Extra link line: %s", newcmd);
 588         }
 589
 590         output = run(newcmd, &status);
 591
 592         free(newcmd);
 593
 594         if (status != 0 || strstr(output, "warning")) {
 595                 if (verbose)
 596                         printf("Compile %s for %s, status %i: %s\n",
 597                                status ? "fail" : "warning",
 598                                test->name, status, output);
 599                 if ((test->style & EXECUTE) && !(test->style & MAY_NOT_COMPILE))
 600                         c12r_errx(1, "Test for %s did not compile:\n%s",
 601                                   test->name, output);
 602                 test->answer = false;
 603                 free(output);
 604         } else {
 605                 /* Compile succeeded. */
 606                 free(output);
 607                 /* We run INSIDE_MAIN tests for sanity checking. */
 608                 if ((test->style & EXECUTE) || (test->style & INSIDE_MAIN)) {
 609                         output = run("." DIR_SEP OUTPUT_FILE, &status);
 610                         if (!(test->style & EXECUTE) && status != 0)
 611                                 c12r_errx(1, "Test for %s failed with %i:\n%s",
 612                                           test->name, status, output);
 613                         if (verbose && status)
 614                                 printf("%s exited %i\n", test->name, status);
 615                         free(output);
 616                 }
 617                 test->answer = (status == 0);
 618         }
 619         test->done = true;
 620
 621         if (test->answer && test->overrides) {
 622                 struct test *override = find_test(test->overrides);
 623                 override->done = true;
 624                 override->answer = true;
 625         }
 626         return test->answer;
 627 }
 628
 629 int main(int argc, const char *argv[])
 630 {
 631         char *cmd;
 632         unsigned int i;
 633         const char *default_args[]
 634                 = { "", DEFAULT_COMPILER, DEFAULT_FLAGS, NULL };
 635
 636         if (argc > 0)
 637                 progname = argv[0];
 638
 639         if (argc > 1) {
 640                 if (strcmp(argv[1], "--help") == 0) {
 641                         printf("Usage: configurator [-v] [<compiler> <flags>...]\n"
 642                                "  <compiler> <flags> will have \"-o <outfile> <infile.c>\" appended\n"
 643                                "Default: %s %s\n",
 644                                DEFAULT_COMPILER, DEFAULT_FLAGS);
 645                         exit(0);
 646                 }
 647                 if (strcmp(argv[1], "-v") == 0) {
 648                         argc--;
 649                         argv++;
 650                         verbose = 1;
 651                 } else if (strcmp(argv[1], "-vv") == 0) {
 652                         argc--;
 653                         argv++;
 654                         verbose = 2;
 655                 }
 656         }
 657
 658         if (argc == 1)
 659                 argv = default_args;
 660
 661         cmd = connect_args(argv, " -o " OUTPUT_FILE " " INPUT_FILE);
 662         for (i = 0; i < sizeof(tests)/sizeof(tests[0]); i++)
 663                 run_test(cmd, &tests[i]);
 664         free(cmd);
 665
 666         remove(OUTPUT_FILE);
 667         remove(INPUT_FILE);
 668
 669         printf("/* Generated by CCAN configurator */\n"
 670                "#ifndef CCAN_CONFIG_H\n"
 671                "#define CCAN_CONFIG_H\n");
 672         printf("#ifndef _GNU_SOURCE\n");
 673         printf("#define _GNU_SOURCE /* Always use GNU extensions. */\n");
 674         printf("#endif\n");
 675         printf("#define CCAN_COMPILER \"%s\"\n", argv[1]);
 676         cmd = connect_args(argv+1, "");
 677         printf("#define CCAN_CFLAGS \"%s\"\n\n", cmd);
 678         free(cmd);
 679         /* This one implies "#include <ccan/..." works, eg. for tdb2.h */
 680         printf("#define HAVE_CCAN 1\n");
 681         for (i = 0; i < sizeof(tests)/sizeof(tests[0]); i++)
 682                 printf("#define %s %u\n", tests[i].name, tests[i].answer);
 683         printf("#endif /* CCAN_CONFIG_H */\n");
 684         return 0;
 685 }