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 #ifdef _MSC_VER
  42 #define DEFAULT_COMPILER "cl"
  43 /* Note:  Dash options avoid POSIX path conversion when used under msys bash
  44  *        and are therefore preferred to slash (e.g. -nologo over /nologo)
  45  * Note:  Disable Warning 4200 "nonstandard extension used : zero-sized array
  46  *        in struct/union" for flexible array members.
  47  */
  48 #define DEFAULT_FLAGS "-nologo -Zi -W4 -wd4200 " \
  49         "-D_CRT_NONSTDC_NO_WARNINGS -D_CRT_SECURE_NO_WARNINGS"
  50 #define DEFAULT_OUTPUT_EXE_FLAG "-Fe:"
  51 #else
  52 #define DEFAULT_COMPILER "cc"
  53 #define DEFAULT_FLAGS "-g3 -ggdb -Wall -Wundef -Wmissing-prototypes -Wmissing-declarations -Wstrict-prototypes -Wold-style-definition"
  54 #define DEFAULT_OUTPUT_EXE_FLAG "-o"
  55 #endif
  56
  57 #define OUTPUT_FILE "configurator.out"
  58 #define INPUT_FILE "configuratortest.c"
  59
  60 #ifdef _WIN32
  61 #define DIR_SEP   "\\"
  62 #else
  63 #define DIR_SEP   "/"
  64 #endif
  65
  66 static const char *progname = "";
  67 static int verbose;
  68
  69 enum test_style {
  70         OUTSIDE_MAIN            = 0x1,
  71         DEFINES_FUNC            = 0x2,
  72         INSIDE_MAIN             = 0x4,
  73         DEFINES_EVERYTHING      = 0x8,
  74         MAY_NOT_COMPILE         = 0x10,
  75         EXECUTE                 = 0x8000
  76 };
  77
  78 struct test {
  79         const char *name;
  80         enum test_style style;
  81         const char *depends;
  82         const char *link;
  83         const char *fragment;
  84         const char *flags;
  85         const char *overrides; /* On success, force this to '1' */
  86         bool done;
  87         bool answer;
  88 };
  89
  90 static struct test tests[] = {
  91         { "HAVE_32BIT_OFF_T", DEFINES_EVERYTHING|EXECUTE|MAY_NOT_COMPILE, NULL, NULL,
  92           "#include <sys/types.h>\n"
  93           "int main(void) {\n"
  94           "     return sizeof(off_t) == 4 ? 0 : 1;\n"
  95           "}\n" },
  96         { "HAVE_ALIGNOF", INSIDE_MAIN, NULL, NULL,
  97           "return __alignof__(double) > 0 ? 0 : 1;" },
  98         { "HAVE_ASPRINTF", DEFINES_FUNC, NULL, NULL,
  99           "#ifndef _GNU_SOURCE\n"
 100           "#define _GNU_SOURCE\n"
 101           "#endif\n"
 102           "#include <stdio.h>\n"
 103           "static char *func(int x) {"
 104           "     char *p;\n"
 105           "     if (asprintf(&p, \"%u\", x) == -1) p = NULL;"
 106           "     return p;\n"
 107           "}" },
 108         { "HAVE_ATTRIBUTE_COLD", DEFINES_FUNC, NULL, NULL,
 109           "static int __attribute__((cold)) func(int x) { return x; }" },
 110         { "HAVE_ATTRIBUTE_CONST", DEFINES_FUNC, NULL, NULL,
 111           "static int __attribute__((const)) func(int x) { return x; }" },
 112         { "HAVE_ATTRIBUTE_PURE", DEFINES_FUNC, NULL, NULL,
 113           "static int __attribute__((pure)) func(int x) { return x; }" },
 114         { "HAVE_ATTRIBUTE_MAY_ALIAS", OUTSIDE_MAIN, NULL, NULL,
 115           "typedef short __attribute__((__may_alias__)) short_a;" },
 116         { "HAVE_ATTRIBUTE_NORETURN", DEFINES_FUNC, NULL, NULL,
 117           "#include <stdlib.h>\n"
 118           "static void __attribute__((noreturn)) func(int x) { exit(x); }" },
 119         { "HAVE_ATTRIBUTE_PRINTF", DEFINES_FUNC, NULL, NULL,
 120           "static void __attribute__((format(__printf__, 1, 2))) func(const char *fmt, ...) { (void)fmt; }" },
 121         { "HAVE_ATTRIBUTE_UNUSED", OUTSIDE_MAIN, NULL, NULL,
 122           "static int __attribute__((unused)) func(int x) { return x; }" },
 123         { "HAVE_ATTRIBUTE_USED", OUTSIDE_MAIN, NULL, NULL,
 124           "static int __attribute__((used)) func(int x) { return x; }" },
 125         { "HAVE_BACKTRACE", DEFINES_FUNC, NULL, NULL,
 126           "#include <execinfo.h>\n"
 127           "static int func(int x) {"
 128           "     void *bt[10];\n"
 129           "     return backtrace(bt, 10) < x;\n"
 130           "}" },
 131         { "HAVE_BIG_ENDIAN", INSIDE_MAIN|EXECUTE, NULL, NULL,
 132           "union { int i; char c[sizeof(int)]; } u;\n"
 133           "u.i = 0x01020304;\n"
 134           "return u.c[0] == 0x01 && u.c[1] == 0x02 && u.c[2] == 0x03 && u.c[3] == 0x04 ? 0 : 1;" },
 135         { "HAVE_BSWAP_64", DEFINES_FUNC, "HAVE_BYTESWAP_H", NULL,
 136           "#include <byteswap.h>\n"
 137           "static int func(int x) { return bswap_64(x); }" },
 138         { "HAVE_BUILTIN_CHOOSE_EXPR", INSIDE_MAIN, NULL, NULL,
 139           "return __builtin_choose_expr(1, 0, \"garbage\");" },
 140         { "HAVE_BUILTIN_CLZ", INSIDE_MAIN, NULL, NULL,
 141           "return __builtin_clz(1) == (sizeof(int)*8 - 1) ? 0 : 1;" },
 142         { "HAVE_BUILTIN_CLZL", INSIDE_MAIN, NULL, NULL,
 143           "return __builtin_clzl(1) == (sizeof(long)*8 - 1) ? 0 : 1;" },
 144         { "HAVE_BUILTIN_CLZLL", INSIDE_MAIN, NULL, NULL,
 145           "return __builtin_clzll(1) == (sizeof(long long)*8 - 1) ? 0 : 1;" },
 146         { "HAVE_BUILTIN_CTZ", INSIDE_MAIN, NULL, NULL,
 147           "return __builtin_ctz(1 << (sizeof(int)*8 - 1)) == (sizeof(int)*8 - 1) ? 0 : 1;" },
 148         { "HAVE_BUILTIN_CTZL", INSIDE_MAIN, NULL, NULL,
 149           "return __builtin_ctzl(1UL << (sizeof(long)*8 - 1)) == (sizeof(long)*8 - 1) ? 0 : 1;" },
 150         { "HAVE_BUILTIN_CTZLL", INSIDE_MAIN, NULL, NULL,
 151           "return __builtin_ctzll(1ULL << (sizeof(long long)*8 - 1)) == (sizeof(long long)*8 - 1) ? 0 : 1;" },
 152         { "HAVE_BUILTIN_CONSTANT_P", INSIDE_MAIN, NULL, NULL,
 153           "return __builtin_constant_p(1) ? 0 : 1;" },
 154         { "HAVE_BUILTIN_EXPECT", INSIDE_MAIN, NULL, NULL,
 155           "return __builtin_expect(argc == 1, 1) ? 0 : 1;" },
 156         { "HAVE_BUILTIN_FFS", INSIDE_MAIN, NULL, NULL,
 157           "return __builtin_ffs(0) == 0 ? 0 : 1;" },
 158         { "HAVE_BUILTIN_FFSL", INSIDE_MAIN, NULL, NULL,
 159           "return __builtin_ffsl(0L) == 0 ? 0 : 1;" },
 160         { "HAVE_BUILTIN_FFSLL", INSIDE_MAIN, NULL, NULL,
 161           "return __builtin_ffsll(0LL) == 0 ? 0 : 1;" },
 162         { "HAVE_BUILTIN_POPCOUNTL", INSIDE_MAIN, NULL, NULL,
 163           "return __builtin_popcountl(255L) == 8 ? 0 : 1;" },
 164         { "HAVE_BUILTIN_TYPES_COMPATIBLE_P", INSIDE_MAIN, NULL, NULL,
 165           "return __builtin_types_compatible_p(char *, int) ? 1 : 0;" },
 166         { "HAVE_ICCARM_INTRINSICS", DEFINES_FUNC, NULL, NULL,
 167           "#include <intrinsics.h>\n"
 168           "int func(int v) {\n"
 169           "     return __CLZ(__RBIT(v));\n"
 170           "}" },
 171         { "HAVE_BYTESWAP_H", OUTSIDE_MAIN, NULL, NULL,
 172           "#include <byteswap.h>\n" },
 173         { "HAVE_CLOCK_GETTIME",
 174           DEFINES_FUNC, "HAVE_STRUCT_TIMESPEC", NULL,
 175           "#include <time.h>\n"
 176           "static struct timespec func(void) {\n"
 177           "     struct timespec ts;\n"
 178           "     clock_gettime(CLOCK_REALTIME, &ts);\n"
 179           "     return ts;\n"
 180           "}\n" },
 181         { "HAVE_CLOCK_GETTIME_IN_LIBRT",
 182           DEFINES_FUNC,
 183           "HAVE_STRUCT_TIMESPEC !HAVE_CLOCK_GETTIME",
 184           "-lrt",
 185           "#include <time.h>\n"
 186           "static struct timespec func(void) {\n"
 187           "     struct timespec ts;\n"
 188           "     clock_gettime(CLOCK_REALTIME, &ts);\n"
 189           "     return ts;\n"
 190           "}\n",
 191           /* This means HAVE_CLOCK_GETTIME, too */
 192           "HAVE_CLOCK_GETTIME" },
 193         { "HAVE_COMPOUND_LITERALS", INSIDE_MAIN, NULL, NULL,
 194           "int *foo = (int[]) { 1, 2, 3, 4 };\n"
 195           "return foo[0] ? 0 : 1;" },
 196         { "HAVE_FCHDIR", DEFINES_EVERYTHING|EXECUTE|MAY_NOT_COMPILE, NULL, NULL,
 197           "#include <sys/types.h>\n"
 198           "#include <sys/stat.h>\n"
 199           "#include <fcntl.h>\n"
 200           "#include <unistd.h>\n"
 201           "int main(void) {\n"
 202           "     int fd = open(\"..\", O_RDONLY);\n"
 203           "     return fchdir(fd) == 0 ? 0 : 1;\n"
 204           "}\n" },
 205         { "HAVE_ERR_H", DEFINES_FUNC, NULL, NULL,
 206           "#include <err.h>\n"
 207           "static void func(int arg) {\n"
 208           "     if (arg == 0)\n"
 209           "             err(1, \"err %u\", arg);\n"
 210           "     if (arg == 1)\n"
 211           "             errx(1, \"err %u\", arg);\n"
 212           "     if (arg == 3)\n"
 213           "             warn(\"warn %u\", arg);\n"
 214           "     if (arg == 4)\n"
 215           "             warnx(\"warn %u\", arg);\n"
 216           "}\n" },
 217         { "HAVE_FILE_OFFSET_BITS", DEFINES_EVERYTHING|EXECUTE|MAY_NOT_COMPILE,
 218           "HAVE_32BIT_OFF_T", NULL,
 219           "#define _FILE_OFFSET_BITS 64\n"
 220           "#include <sys/types.h>\n"
 221           "int main(void) {\n"
 222           "     return sizeof(off_t) == 8 ? 0 : 1;\n"
 223           "}\n" },
 224         { "HAVE_FOR_LOOP_DECLARATION", INSIDE_MAIN, NULL, NULL,
 225           "int ret = 1;\n"
 226           "for (int i = 0; i < argc; i++) { ret = 0; };\n"
 227           "return ret;" },
 228         { "HAVE_FLEXIBLE_ARRAY_MEMBER", OUTSIDE_MAIN, NULL, NULL,
 229           "struct foo { unsigned int x; int arr[]; };" },
 230         { "HAVE_GETPAGESIZE", DEFINES_FUNC, NULL, NULL,
 231           "#include <unistd.h>\n"
 232           "static int func(void) { return getpagesize(); }" },
 233         { "HAVE_ISBLANK", DEFINES_FUNC, NULL, NULL,
 234           "#ifndef _GNU_SOURCE\n"
 235           "#define _GNU_SOURCE\n"
 236           "#endif\n"
 237           "#include <ctype.h>\n"
 238           "static int func(void) { return isblank(' '); }" },
 239         { "HAVE_LITTLE_ENDIAN", INSIDE_MAIN|EXECUTE, NULL, NULL,
 240           "union { int i; char c[sizeof(int)]; } u;\n"
 241           "u.i = 0x01020304;\n"
 242           "return u.c[0] == 0x04 && u.c[1] == 0x03 && u.c[2] == 0x02 && u.c[3] == 0x01 ? 0 : 1;" },
 243         { "HAVE_MEMMEM", DEFINES_FUNC, NULL, NULL,
 244           "#ifndef _GNU_SOURCE\n"
 245           "#define _GNU_SOURCE\n"
 246           "#endif\n"
 247           "#include <string.h>\n"
 248           "static void *func(void *h, size_t hl, void *n, size_t nl) {\n"
 249           "return memmem(h, hl, n, nl);"
 250           "}\n", },
 251         { "HAVE_MEMRCHR", DEFINES_FUNC, NULL, NULL,
 252           "#ifndef _GNU_SOURCE\n"
 253           "#define _GNU_SOURCE\n"
 254           "#endif\n"
 255           "#include <string.h>\n"
 256           "static void *func(void *s, int c, size_t n) {\n"
 257           "return memrchr(s, c, n);"
 258           "}\n", },
 259         { "HAVE_MMAP", DEFINES_FUNC, NULL, NULL,
 260           "#include <sys/mman.h>\n"
 261           "static void *func(int fd) {\n"
 262           "     return mmap(0, 65536, PROT_READ, MAP_SHARED, fd, 0);\n"
 263           "}" },
 264         { "HAVE_PROC_SELF_MAPS", DEFINES_EVERYTHING|EXECUTE|MAY_NOT_COMPILE, NULL, NULL,
 265           "#include <sys/types.h>\n"
 266           "#include <sys/stat.h>\n"
 267           "#include <fcntl.h>\n"
 268           "int main(void) {\n"
 269           "     return open(\"/proc/self/maps\", O_RDONLY) != -1 ? 0 : 1;\n"
 270           "}\n" },
 271         { "HAVE_QSORT_R_PRIVATE_LAST",
 272           DEFINES_EVERYTHING|EXECUTE|MAY_NOT_COMPILE, NULL, NULL,
 273           "#ifndef _GNU_SOURCE\n"
 274           "#define _GNU_SOURCE\n"
 275           "#endif\n"
 276           "#include <stdlib.h>\n"
 277           "static int cmp(const void *lp, const void *rp, void *priv) {\n"
 278           " *(unsigned int *)priv = 1;\n"
 279           " return *(const int *)lp - *(const int *)rp; }\n"
 280           "int main(void) {\n"
 281           " int array[] = { 9, 2, 5 };\n"
 282           " unsigned int called = 0;\n"
 283           " qsort_r(array, 3, sizeof(int), cmp, &called);\n"
 284           " return called && array[0] == 2 && array[1] == 5 && array[2] == 9 ? 0 : 1;\n"
 285           "}\n" },
 286         { "HAVE_STRUCT_TIMESPEC",
 287           DEFINES_FUNC, NULL, NULL,
 288           "#include <time.h>\n"
 289           "static void func(void) {\n"
 290           "     struct timespec ts;\n"
 291           "     ts.tv_sec = ts.tv_nsec = 1;\n"
 292           "}\n" },
 293         { "HAVE_SECTION_START_STOP",
 294           DEFINES_FUNC, NULL, NULL,
 295           "static void *__attribute__((__section__(\"mysec\"))) p = &p;\n"
 296           "static int func(void) {\n"
 297           "     extern void *__start_mysec[], *__stop_mysec[];\n"
 298           "     return __stop_mysec - __start_mysec;\n"
 299           "}\n" },
 300         { "HAVE_STACK_GROWS_UPWARDS", DEFINES_EVERYTHING|EXECUTE, NULL, NULL,
 301           "#include <stddef.h>\n"
 302           "static ptrdiff_t nest(const void *base, unsigned int i)\n"
 303           "{\n"
 304           "     if (i == 0)\n"
 305           "             return (const char *)&i - (const char *)base;\n"
 306           "     return nest(base, i-1);\n"
 307           "}\n"
 308           "int main(int argc, char *argv[]) {\n"
 309           "     (void)argv;\n"
 310           "     return (nest(&argc, argc) > 0) ? 0 : 1;\n"
 311           "}\n" },
 312         { "HAVE_STATEMENT_EXPR", INSIDE_MAIN, NULL, NULL,
 313           "return ({ int x = argc; x == argc ? 0 : 1; });" },
 314         { "HAVE_SYS_FILIO_H", OUTSIDE_MAIN, NULL, NULL, /* Solaris needs this for FIONREAD */
 315           "#include <sys/filio.h>\n" },
 316         { "HAVE_SYS_TERMIOS_H", OUTSIDE_MAIN, NULL, NULL,
 317           "#include <sys/termios.h>\n" },
 318         { "HAVE_TYPEOF", INSIDE_MAIN, NULL, NULL,
 319           "__typeof__(argc) i; i = argc; return i == argc ? 0 : 1;" },
 320         { "HAVE_UNALIGNED_ACCESS", DEFINES_EVERYTHING|EXECUTE, NULL, NULL,
 321           "#include <string.h>\n"
 322           "int main(int argc, char *argv[]) {\n"
 323           "     (void)argc;\n"
 324           "     char pad[sizeof(int *) * 1];\n"
 325           "     strncpy(pad, argv[0], sizeof(pad));\n"
 326           "     int *x = (int *)pad, *y = (int *)(pad + 1);\n"
 327           "     return *x == *y;\n"
 328           "}\n" },
 329         { "HAVE_UTIME", DEFINES_FUNC, NULL, NULL,
 330           "#include <sys/types.h>\n"
 331           "#include <utime.h>\n"
 332           "static int func(const char *filename) {\n"
 333           "     struct utimbuf times = { 0 };\n"
 334           "     return utime(filename, &times);\n"
 335           "}" },
 336         { "HAVE_WARN_UNUSED_RESULT", DEFINES_FUNC, NULL, NULL,
 337           "#include <sys/types.h>\n"
 338           "#include <utime.h>\n"
 339           "static __attribute__((warn_unused_result)) int func(int i) {\n"
 340           "     return i + 1;\n"
 341           "}" },
 342         { "HAVE_OPENMP", INSIDE_MAIN, NULL, NULL,
 343           "int i;\n"
 344           "#pragma omp parallel for\n"
 345           "for(i = 0; i < 0; i++) {};\n"
 346           "return 0;\n",
 347           "-Werror -fopenmp" },
 348         { "HAVE_VALGRIND_MEMCHECK_H", OUTSIDE_MAIN, NULL, NULL,
 349           "#include <valgrind/memcheck.h>\n" },
 350         { "HAVE_UCONTEXT", DEFINES_EVERYTHING|EXECUTE|MAY_NOT_COMPILE,
 351           NULL, NULL,
 352           "#include <ucontext.h>\n"
 353           "static int x = 0;\n"
 354           "static char stack[2048];\n"
 355           "static ucontext_t a, b;\n"
 356           "static void fn(void) {\n"
 357           "     x |= 2;\n"
 358           "     setcontext(&b);\n"
 359           "     x |= 4;\n"
 360           "}\n"
 361           "int main(void) {\n"
 362           "     x |= 1;\n"
 363           "     getcontext(&a);\n"
 364           "     a.uc_stack.ss_sp = stack;\n"
 365           "     a.uc_stack.ss_size = sizeof(stack);\n"
 366           "     makecontext(&a, fn, 0);\n"
 367           "     swapcontext(&b, &a);\n"
 368           "     return (x == 3) ? 0 : 1;\n"
 369           "}\n"
 370         },
 371         { "HAVE_POINTER_SAFE_MAKECONTEXT", DEFINES_EVERYTHING|EXECUTE|MAY_NOT_COMPILE,
 372           "HAVE_UCONTEXT", NULL,
 373           "#include <stddef.h>\n"
 374           "#include <ucontext.h>\n"
 375           "static int worked = 0;\n"
 376           "static char stack[1024];\n"
 377           "static ucontext_t a, b;\n"
 378           "static void fn(void *p, void *q) {\n"
 379           "     void *cp = &worked;\n"
 380           "     void *cq = (void *)(~((ptrdiff_t)cp));\n"
 381           "     if ((p == cp) && (q == cq))\n"
 382           "             worked = 1;\n"
 383           "     setcontext(&b);\n"
 384           "}\n"
 385           "int main(void) {\n"
 386           "     void *ap = &worked;\n"
 387           "     void *aq = (void *)(~((ptrdiff_t)ap));\n"
 388           "     getcontext(&a);\n"
 389           "     a.uc_stack.ss_sp = stack;\n"
 390           "     a.uc_stack.ss_size = sizeof(stack);\n"
 391           "     makecontext(&a, (void (*)(void))fn, 2, ap, aq);\n"
 392           "     swapcontext(&b, &a);\n"
 393           "     return worked ? 0 : 1;\n"
 394           "}\n"
 395         },
 396 };
 397
 398 static void c12r_err(int eval, const char *fmt, ...)
 399 {
 400         int err_errno = errno;
 401         va_list ap;
 402
 403         fprintf(stderr, "%s: ", progname);
 404         va_start(ap, fmt);
 405         vfprintf(stderr, fmt, ap);
 406         va_end(ap);
 407         fprintf(stderr, ": %s\n", strerror(err_errno));
 408         exit(eval);
 409 }
 410
 411 static void c12r_errx(int eval, const char *fmt, ...)
 412 {
 413         va_list ap;
 414
 415         fprintf(stderr, "%s: ", progname);
 416         va_start(ap, fmt);
 417         vfprintf(stderr, fmt, ap);
 418         va_end(ap);
 419         fprintf(stderr, "\n");
 420         exit(eval);
 421 }
 422
 423 static size_t fcopy(FILE *fsrc, FILE *fdst)
 424 {
 425         char buffer[BUFSIZ];
 426         size_t rsize, wsize;
 427         size_t copied = 0;
 428
 429         while ((rsize = fread(buffer, 1, BUFSIZ, fsrc)) > 0) {
 430                 wsize = fwrite(buffer, 1, rsize, fdst);
 431                 copied += wsize;
 432                 if (wsize != rsize)
 433                         break;
 434         }
 435
 436         return copied;
 437 }
 438
 439 static char *grab_stream(FILE *file)
 440 {
 441         size_t max, ret, size = 0;
 442         char *buffer;
 443
 444         max = BUFSIZ;
 445         buffer = malloc(max);
 446         while ((ret = fread(buffer+size, 1, max - size, file)) == max - size) {
 447                 size += ret;
 448                 buffer = realloc(buffer, max *= 2);
 449         }
 450         size += ret;
 451         if (ferror(file))
 452                 c12r_err(1, "reading from command");
 453         buffer[size] = '\0';
 454         return buffer;
 455 }
 456
 457 static char *run(const char *cmd, int *exitstatus)
 458 {
 459         static const char redir[] = " 2>&1";
 460         size_t cmdlen;
 461         char *cmdredir;
 462         FILE *cmdout;
 463         char *ret;
 464
 465         cmdlen = strlen(cmd);
 466         cmdredir = malloc(cmdlen + sizeof(redir));
 467         memcpy(cmdredir, cmd, cmdlen);
 468         memcpy(cmdredir + cmdlen, redir, sizeof(redir));
 469
 470         cmdout = popen(cmdredir, "r");
 471         if (!cmdout)
 472                 c12r_err(1, "popen \"%s\"", cmdredir);
 473
 474         free(cmdredir);
 475
 476         ret = grab_stream(cmdout);
 477         *exitstatus = pclose(cmdout);
 478         return ret;
 479 }
 480
 481 static char *connect_args(const char *argv[], const char *outflag,
 482                 const char *files)
 483 {
 484         unsigned int i;
 485         char *ret;
 486         size_t len = strlen(outflag) + strlen(files) + 1;
 487
 488         for (i = 1; argv[i]; i++)
 489                 len += 1 + strlen(argv[i]);
 490
 491         ret = malloc(len);
 492         len = 0;
 493         for (i = 1; argv[i]; i++) {
 494                 strcpy(ret + len, argv[i]);
 495                 len += strlen(argv[i]);
 496                 if (argv[i+1] || *outflag)
 497                         ret[len++] = ' ';
 498         }
 499         strcpy(ret + len, outflag);
 500         len += strlen(outflag);
 501         strcpy(ret + len, files);
 502         return ret;
 503 }
 504
 505 static struct test *find_test(const char *name)
 506 {
 507         unsigned int i;
 508
 509         for (i = 0; i < sizeof(tests)/sizeof(tests[0]); i++) {
 510                 if (strcmp(tests[i].name, name) == 0)
 511                         return &tests[i];
 512         }
 513         abort();
 514 }
 515
 516 #define PRE_BOILERPLATE "/* Test program generated by configurator. */\n"
 517 #define MAIN_START_BOILERPLATE \
 518         "int main(int argc, char *argv[]) {\n" \
 519         "       (void)argc;\n" \
 520         "       (void)argv;\n"
 521 #define USE_FUNC_BOILERPLATE "(void)func;\n"
 522 #define MAIN_BODY_BOILERPLATE "return 0;\n"
 523 #define MAIN_END_BOILERPLATE "}\n"
 524
 525 static bool run_test(const char *cmd, struct test *test)
 526 {
 527         char *output, *newcmd;
 528         FILE *outf;
 529         int status;
 530
 531         if (test->done)
 532                 return test->answer;
 533
 534         if (test->depends) {
 535                 size_t len;
 536                 const char *deps = test->depends;
 537                 char *dep;
 538
 539                 /* Space-separated dependencies, could be ! for inverse. */
 540                 while ((len = strcspn(deps, " ")) != 0) {
 541                         bool positive = true;
 542                         if (deps[len]) {
 543                                 dep = strdup(deps);
 544                                 dep[len] = '\0';
 545                         } else {
 546                                 dep = (char *)deps;
 547                         }
 548
 549                         if (dep[0] == '!') {
 550                                 dep++;
 551                                 positive = false;
 552                         }
 553                         if (run_test(cmd, find_test(dep)) != positive) {
 554                                 test->answer = false;
 555                                 test->done = true;
 556                                 return test->answer;
 557                         }
 558                         if (deps[len])
 559                                 free(dep);
 560
 561                         deps += len;
 562                         deps += strspn(deps, " ");
 563                 }
 564         }
 565
 566         outf = fopen(INPUT_FILE, verbose > 1 ? "w+" : "w");
 567         if (!outf)
 568                 c12r_err(1, "creating %s", INPUT_FILE);
 569
 570         fprintf(outf, "%s", PRE_BOILERPLATE);
 571         switch (test->style & ~(EXECUTE|MAY_NOT_COMPILE)) {
 572         case INSIDE_MAIN:
 573                 fprintf(outf, "%s", MAIN_START_BOILERPLATE);
 574                 fprintf(outf, "%s", test->fragment);
 575                 fprintf(outf, "%s", MAIN_END_BOILERPLATE);
 576                 break;
 577         case OUTSIDE_MAIN:
 578                 fprintf(outf, "%s", test->fragment);
 579                 fprintf(outf, "%s", MAIN_START_BOILERPLATE);
 580                 fprintf(outf, "%s", MAIN_BODY_BOILERPLATE);
 581                 fprintf(outf, "%s", MAIN_END_BOILERPLATE);
 582                 break;
 583         case DEFINES_FUNC:
 584                 fprintf(outf, "%s", test->fragment);
 585                 fprintf(outf, "%s", MAIN_START_BOILERPLATE);
 586                 fprintf(outf, "%s", USE_FUNC_BOILERPLATE);
 587                 fprintf(outf, "%s", MAIN_BODY_BOILERPLATE);
 588                 fprintf(outf, "%s", MAIN_END_BOILERPLATE);
 589                 break;
 590         case DEFINES_EVERYTHING:
 591                 fprintf(outf, "%s", test->fragment);
 592                 break;
 593         default:
 594                 abort();
 595
 596         }
 597
 598         if (verbose > 1) {
 599                 fseek(outf, 0, SEEK_SET);
 600                 fcopy(outf, stdout);
 601         }
 602
 603         fclose(outf);
 604
 605         newcmd = strdup(cmd);
 606
 607         if (test->flags) {
 608                 newcmd = realloc(newcmd, strlen(newcmd) + strlen(" ")
 609                                 + strlen(test->flags) + 1);
 610                 strcat(newcmd, " ");
 611                 strcat(newcmd, test->flags);
 612                 if (verbose > 1)
 613                         printf("Extra flags line: %s", newcmd);
 614         }
 615
 616         if (test->link) {
 617                 newcmd = realloc(newcmd, strlen(newcmd) + strlen(" ")
 618                                 + strlen(test->link) + 1);
 619                 strcat(newcmd, " ");
 620                 strcat(newcmd, test->link);
 621                 if (verbose > 1)
 622                         printf("Extra link line: %s", newcmd);
 623         }
 624
 625         output = run(newcmd, &status);
 626
 627         free(newcmd);
 628
 629         if (status != 0 || strstr(output, "warning")) {
 630                 if (verbose)
 631                         printf("Compile %s for %s, status %i: %s\n",
 632                                status ? "fail" : "warning",
 633                                test->name, status, output);
 634                 if ((test->style & EXECUTE) && !(test->style & MAY_NOT_COMPILE))
 635                         c12r_errx(1, "Test for %s did not compile:\n%s",
 636                                   test->name, output);
 637                 test->answer = false;
 638                 free(output);
 639         } else {
 640                 /* Compile succeeded. */
 641                 free(output);
 642                 /* We run INSIDE_MAIN tests for sanity checking. */
 643                 if ((test->style & EXECUTE) || (test->style & INSIDE_MAIN)) {
 644                         output = run("." DIR_SEP OUTPUT_FILE, &status);
 645                         if (!(test->style & EXECUTE) && status != 0)
 646                                 c12r_errx(1, "Test for %s failed with %i:\n%s",
 647                                           test->name, status, output);
 648                         if (verbose && status)
 649                                 printf("%s exited %i\n", test->name, status);
 650                         free(output);
 651                 }
 652                 test->answer = (status == 0);
 653         }
 654         test->done = true;
 655
 656         if (test->answer && test->overrides) {
 657                 struct test *override = find_test(test->overrides);
 658                 override->done = true;
 659                 override->answer = true;
 660         }
 661         return test->answer;
 662 }
 663
 664 int main(int argc, const char *argv[])
 665 {
 666         char *cmd;
 667         unsigned int i;
 668         const char *default_args[]
 669                 = { "", DEFAULT_COMPILER, DEFAULT_FLAGS, NULL };
 670         const char *outflag = DEFAULT_OUTPUT_EXE_FLAG;
 671
 672         if (argc > 0)
 673                 progname = argv[0];
 674
 675         while (argc > 1) {
 676                 if (strcmp(argv[1], "--help") == 0) {
 677                         printf("Usage: configurator [-v] [-O<outflag>] [<compiler> <flags>...]\n"
 678                                "  <compiler> <flags> will have \"<outflag> <outfile> <infile.c>\" appended\n"
 679                                "Default: %s %s %s\n",
 680                                DEFAULT_COMPILER, DEFAULT_FLAGS,
 681                                DEFAULT_OUTPUT_EXE_FLAG);
 682                         exit(0);
 683                 }
 684                 if (strncmp(argv[1], "-O", 2) == 0) {
 685                         argc--;
 686                         argv++;
 687                         outflag = argv[1] + 2;
 688                         if (!*outflag) {
 689                                 fprintf(stderr,
 690                                         "%s: option requires an argument -- O\n",
 691                                         argv[0]);
 692                                 exit(1);
 693                         }
 694                 } else if (strcmp(argv[1], "-v") == 0) {
 695                         argc--;
 696                         argv++;
 697                         verbose++;
 698                 } else if (strcmp(argv[1], "-vv") == 0) {
 699                         argc--;
 700                         argv++;
 701                         verbose += 2;
 702                 } else {
 703                         break;
 704                 }
 705         }
 706
 707         if (argc == 1)
 708                 argv = default_args;
 709
 710         cmd = connect_args(argv, outflag, OUTPUT_FILE " " INPUT_FILE);
 711         for (i = 0; i < sizeof(tests)/sizeof(tests[0]); i++)
 712                 run_test(cmd, &tests[i]);
 713         free(cmd);
 714
 715         remove(OUTPUT_FILE);
 716         remove(INPUT_FILE);
 717
 718         printf("/* Generated by CCAN configurator */\n"
 719                "#ifndef CCAN_CONFIG_H\n"
 720                "#define CCAN_CONFIG_H\n");
 721         printf("#ifndef _GNU_SOURCE\n");
 722         printf("#define _GNU_SOURCE /* Always use GNU extensions. */\n");
 723         printf("#endif\n");
 724         printf("#define CCAN_COMPILER \"%s\"\n", argv[1]);
 725         cmd = connect_args(argv + 1, "", "");
 726         printf("#define CCAN_CFLAGS \"%s\"\n", cmd);
 727         free(cmd);
 728         printf("#define CCAN_OUTPUT_EXE_CFLAG \"%s\"\n\n", outflag);
 729         /* This one implies "#include <ccan/..." works, eg. for tdb2.h */
 730         printf("#define HAVE_CCAN 1\n");
 731         for (i = 0; i < sizeof(tests)/sizeof(tests[0]); i++)
 732                 printf("#define %s %u\n", tests[i].name, tests[i].answer);
 733         printf("#endif /* CCAN_CONFIG_H */\n");
 734         return 0;
 735 }