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 #include <unistd.h>
  36
  37 #ifdef _MSC_VER
  38 #define popen _popen
  39 #define pclose _pclose
  40 #endif
  41
  42 #ifdef _MSC_VER
  43 #define DEFAULT_COMPILER "cl"
  44 /* Note:  Dash options avoid POSIX path conversion when used under msys bash
  45  *        and are therefore preferred to slash (e.g. -nologo over /nologo)
  46  * Note:  Disable Warning 4200 "nonstandard extension used : zero-sized array
  47  *        in struct/union" for flexible array members.
  48  */
  49 #define DEFAULT_FLAGS "-nologo -Zi -W4 -wd4200 " \
  50         "-D_CRT_NONSTDC_NO_WARNINGS -D_CRT_SECURE_NO_WARNINGS"
  51 #define DEFAULT_OUTPUT_EXE_FLAG "-Fe:"
  52 #else
  53 #define DEFAULT_COMPILER "cc"
  54 #define DEFAULT_FLAGS "-g3 -ggdb -Wall -Wundef -Wmissing-prototypes -Wmissing-declarations -Wstrict-prototypes -Wold-style-definition"
  55 #define DEFAULT_OUTPUT_EXE_FLAG "-o"
  56 #endif
  57
  58 #define OUTPUT_FILE "configurator.out"
  59 #define INPUT_FILE "configuratortest.c"
  60
  61 #ifdef _WIN32
  62 #define DIR_SEP   "\\"
  63 #else
  64 #define DIR_SEP   "/"
  65 #endif
  66
  67 static const char *progname = "";
  68 static int verbose;
  69 static bool like_a_libtool = false;
  70
  71 struct test {
  72         const char *name;
  73         /*
  74          * Template style flags (pick one):
  75          * OUTSIDE_MAIN:
  76          * - put a simple boilerplate main below it.
  77          * DEFINES_FUNC:
  78          * - defines a static function called func; adds ref to avoid warnings
  79          * INSIDE_MAIN:
  80          * - put this inside main().
  81          * DEFINES_EVERYTHING:
  82          * - don't add any boilerplate at all.
  83          *
  84          * Execution flags:
  85          * EXECUTE:
  86          * - a runtime test; must compile, exit 0 means flag is set.
  87          * MAY_NOT_COMPILE:
  88          * - Only useful with EXECUTE: don't get upset if it doesn't compile.
  89          * <nothing>:
  90          * - a compile test, if it compiles must run and exit 0.
  91          */
  92         const char *style;
  93         const char *depends;
  94         const char *link;
  95         const char *fragment;
  96         const char *flags;
  97         const char *overrides; /* On success, force this to '1' */
  98         bool done;
  99         bool answer;
 100 };
 101
 102 static struct test tests[] = {
 103         { "HAVE_32BIT_OFF_T", "DEFINES_EVERYTHING|EXECUTE|MAY_NOT_COMPILE", NULL, NULL,
 104           "#include <sys/types.h>\n"
 105           "int main(void) {\n"
 106           "     return sizeof(off_t) == 4 ? 0 : 1;\n"
 107           "}\n" },
 108         { "HAVE_ALIGNOF", "INSIDE_MAIN", NULL, NULL,
 109           "return __alignof__(double) > 0 ? 0 : 1;" },
 110         { "HAVE_ASPRINTF", "DEFINES_FUNC", NULL, NULL,
 111           "#ifndef _GNU_SOURCE\n"
 112           "#define _GNU_SOURCE\n"
 113           "#endif\n"
 114           "#include <stdio.h>\n"
 115           "static char *func(int x) {"
 116           "     char *p;\n"
 117           "     if (asprintf(&p, \"%u\", x) == -1) \n"
 118           "             p = NULL;\n"
 119           "     return p;\n"
 120           "}" },
 121         { "HAVE_ATTRIBUTE_COLD", "DEFINES_FUNC", NULL, NULL,
 122           "static int __attribute__((cold)) func(int x) { return x; }" },
 123         { "HAVE_ATTRIBUTE_CONST", "DEFINES_FUNC", NULL, NULL,
 124           "static int __attribute__((const)) func(int x) { return x; }" },
 125         { "HAVE_ATTRIBUTE_PURE", "DEFINES_FUNC", NULL, NULL,
 126           "static int __attribute__((pure)) func(int x) { return x; }" },
 127         { "HAVE_ATTRIBUTE_MAY_ALIAS", "OUTSIDE_MAIN", NULL, NULL,
 128           "typedef short __attribute__((__may_alias__)) short_a;" },
 129         { "HAVE_ATTRIBUTE_NORETURN", "DEFINES_FUNC", NULL, NULL,
 130           "#include <stdlib.h>\n"
 131           "static void __attribute__((noreturn)) func(int x) { exit(x); }" },
 132         { "HAVE_ATTRIBUTE_PRINTF", "DEFINES_FUNC", NULL, NULL,
 133           "static void __attribute__((format(__printf__, 1, 2))) func(const char *fmt, ...) { (void)fmt; }" },
 134         { "HAVE_ATTRIBUTE_UNUSED", "OUTSIDE_MAIN", NULL, NULL,
 135           "static int __attribute__((unused)) func(int x) { return x; }" },
 136         { "HAVE_ATTRIBUTE_USED", "OUTSIDE_MAIN", NULL, NULL,
 137           "static int __attribute__((used)) func(int x) { return x; }" },
 138         { "HAVE_BACKTRACE", "DEFINES_FUNC", NULL, NULL,
 139           "#include <execinfo.h>\n"
 140           "static int func(int x) {"
 141           "     void *bt[10];\n"
 142           "     return backtrace(bt, 10) < x;\n"
 143           "}" },
 144         { "HAVE_BIG_ENDIAN", "INSIDE_MAIN|EXECUTE", NULL, NULL,
 145           "union { int i; char c[sizeof(int)]; } u;\n"
 146           "u.i = 0x01020304;\n"
 147           "return u.c[0] == 0x01 && u.c[1] == 0x02 && u.c[2] == 0x03 && u.c[3] == 0x04 ? 0 : 1;" },
 148         { "HAVE_BSWAP_64", "DEFINES_FUNC", "HAVE_BYTESWAP_H", NULL,
 149           "#include <byteswap.h>\n"
 150           "static int func(int x) { return bswap_64(x); }" },
 151         { "HAVE_BUILTIN_CHOOSE_EXPR", "INSIDE_MAIN", NULL, NULL,
 152           "return __builtin_choose_expr(1, 0, \"garbage\");" },
 153         { "HAVE_BUILTIN_CLZ", "INSIDE_MAIN", NULL, NULL,
 154           "return __builtin_clz(1) == (sizeof(int)*8 - 1) ? 0 : 1;" },
 155         { "HAVE_BUILTIN_CLZL", "INSIDE_MAIN", NULL, NULL,
 156           "return __builtin_clzl(1) == (sizeof(long)*8 - 1) ? 0 : 1;" },
 157         { "HAVE_BUILTIN_CLZLL", "INSIDE_MAIN", NULL, NULL,
 158           "return __builtin_clzll(1) == (sizeof(long long)*8 - 1) ? 0 : 1;" },
 159         { "HAVE_BUILTIN_CTZ", "INSIDE_MAIN", NULL, NULL,
 160           "return __builtin_ctz(1 << (sizeof(int)*8 - 1)) == (sizeof(int)*8 - 1) ? 0 : 1;" },
 161         { "HAVE_BUILTIN_CTZL", "INSIDE_MAIN", NULL, NULL,
 162           "return __builtin_ctzl(1UL << (sizeof(long)*8 - 1)) == (sizeof(long)*8 - 1) ? 0 : 1;" },
 163         { "HAVE_BUILTIN_CTZLL", "INSIDE_MAIN", NULL, NULL,
 164           "return __builtin_ctzll(1ULL << (sizeof(long long)*8 - 1)) == (sizeof(long long)*8 - 1) ? 0 : 1;" },
 165         { "HAVE_BUILTIN_CONSTANT_P", "INSIDE_MAIN", NULL, NULL,
 166           "return __builtin_constant_p(1) ? 0 : 1;" },
 167         { "HAVE_BUILTIN_EXPECT", "INSIDE_MAIN", NULL, NULL,
 168           "return __builtin_expect(argc == 1, 1) ? 0 : 1;" },
 169         { "HAVE_BUILTIN_FFS", "INSIDE_MAIN", NULL, NULL,
 170           "return __builtin_ffs(0) == 0 ? 0 : 1;" },
 171         { "HAVE_BUILTIN_FFSL", "INSIDE_MAIN", NULL, NULL,
 172           "return __builtin_ffsl(0L) == 0 ? 0 : 1;" },
 173         { "HAVE_BUILTIN_FFSLL", "INSIDE_MAIN", NULL, NULL,
 174           "return __builtin_ffsll(0LL) == 0 ? 0 : 1;" },
 175         { "HAVE_BUILTIN_POPCOUNT", "INSIDE_MAIN", NULL, NULL,
 176           "return __builtin_popcount(255) == 8 ? 0 : 1;" },
 177         { "HAVE_BUILTIN_POPCOUNTL", "INSIDE_MAIN", NULL, NULL,
 178           "return __builtin_popcountl(255L) == 8 ? 0 : 1;" },
 179         { "HAVE_BUILTIN_POPCOUNTLL", "INSIDE_MAIN", NULL, NULL,
 180           "return __builtin_popcountll(255LL) == 8 ? 0 : 1;" },
 181         { "HAVE_BUILTIN_TYPES_COMPATIBLE_P", "INSIDE_MAIN", NULL, NULL,
 182           "return __builtin_types_compatible_p(char *, int) ? 1 : 0;" },
 183         { "HAVE_ICCARM_INTRINSICS", "DEFINES_FUNC", NULL, NULL,
 184           "#include <intrinsics.h>\n"
 185           "int func(int v) {\n"
 186           "     return __CLZ(__RBIT(v));\n"
 187           "}" },
 188         { "HAVE_BYTESWAP_H", "OUTSIDE_MAIN", NULL, NULL,
 189           "#include <byteswap.h>\n" },
 190         { "HAVE_CLOCK_GETTIME",
 191           "DEFINES_FUNC", "HAVE_STRUCT_TIMESPEC", NULL,
 192           "#include <time.h>\n"
 193           "static struct timespec func(void) {\n"
 194           "     struct timespec ts;\n"
 195           "     clock_gettime(CLOCK_REALTIME, &ts);\n"
 196           "     return ts;\n"
 197           "}\n" },
 198         { "HAVE_CLOCK_GETTIME_IN_LIBRT",
 199           "DEFINES_FUNC",
 200           "HAVE_STRUCT_TIMESPEC !HAVE_CLOCK_GETTIME",
 201           "-lrt",
 202           "#include <time.h>\n"
 203           "static struct timespec func(void) {\n"
 204           "     struct timespec ts;\n"
 205           "     clock_gettime(CLOCK_REALTIME, &ts);\n"
 206           "     return ts;\n"
 207           "}\n",
 208           /* This means HAVE_CLOCK_GETTIME, too */
 209           "HAVE_CLOCK_GETTIME" },
 210         { "HAVE_COMPOUND_LITERALS", "INSIDE_MAIN", NULL, NULL,
 211           "int *foo = (int[]) { 1, 2, 3, 4 };\n"
 212           "return foo[0] ? 0 : 1;" },
 213         { "HAVE_FCHDIR", "DEFINES_EVERYTHING|EXECUTE|MAY_NOT_COMPILE", NULL, NULL,
 214           "#include <sys/types.h>\n"
 215           "#include <sys/stat.h>\n"
 216           "#include <fcntl.h>\n"
 217           "#include <unistd.h>\n"
 218           "int main(void) {\n"
 219           "     int fd = open(\"..\", O_RDONLY);\n"
 220           "     return fchdir(fd) == 0 ? 0 : 1;\n"
 221           "}\n" },
 222         { "HAVE_ERR_H", "DEFINES_FUNC", NULL, NULL,
 223           "#include <err.h>\n"
 224           "static void func(int arg) {\n"
 225           "     if (arg == 0)\n"
 226           "             err(1, \"err %u\", arg);\n"
 227           "     if (arg == 1)\n"
 228           "             errx(1, \"err %u\", arg);\n"
 229           "     if (arg == 3)\n"
 230           "             warn(\"warn %u\", arg);\n"
 231           "     if (arg == 4)\n"
 232           "             warnx(\"warn %u\", arg);\n"
 233           "}\n" },
 234         { "HAVE_FILE_OFFSET_BITS", "DEFINES_EVERYTHING|EXECUTE|MAY_NOT_COMPILE",
 235           "HAVE_32BIT_OFF_T", NULL,
 236           "#define _FILE_OFFSET_BITS 64\n"
 237           "#include <sys/types.h>\n"
 238           "int main(void) {\n"
 239           "     return sizeof(off_t) == 8 ? 0 : 1;\n"
 240           "}\n" },
 241         { "HAVE_FOR_LOOP_DECLARATION", "INSIDE_MAIN", NULL, NULL,
 242           "int ret = 1;\n"
 243           "for (int i = 0; i < argc; i++) { ret = 0; };\n"
 244           "return ret;" },
 245         { "HAVE_FLEXIBLE_ARRAY_MEMBER", "OUTSIDE_MAIN", NULL, NULL,
 246           "struct foo { unsigned int x; int arr[]; };" },
 247         { "HAVE_GETPAGESIZE", "DEFINES_FUNC", NULL, NULL,
 248           "#include <unistd.h>\n"
 249           "static int func(void) { return getpagesize(); }" },
 250         { "HAVE_ISBLANK", "DEFINES_FUNC", NULL, NULL,
 251           "#ifndef _GNU_SOURCE\n"
 252           "#define _GNU_SOURCE\n"
 253           "#endif\n"
 254           "#include <ctype.h>\n"
 255           "static int func(void) { return isblank(' '); }" },
 256         { "HAVE_LITTLE_ENDIAN", "INSIDE_MAIN|EXECUTE", NULL, NULL,
 257           "union { int i; char c[sizeof(int)]; } u;\n"
 258           "u.i = 0x01020304;\n"
 259           "return u.c[0] == 0x04 && u.c[1] == 0x03 && u.c[2] == 0x02 && u.c[3] == 0x01 ? 0 : 1;" },
 260         { "HAVE_MEMMEM", "DEFINES_FUNC", NULL, NULL,
 261           "#ifndef _GNU_SOURCE\n"
 262           "#define _GNU_SOURCE\n"
 263           "#endif\n"
 264           "#include <string.h>\n"
 265           "static void *func(void *h, size_t hl, void *n, size_t nl) {\n"
 266           "return memmem(h, hl, n, nl);"
 267           "}\n", },
 268         { "HAVE_MEMRCHR", "DEFINES_FUNC", NULL, NULL,
 269           "#ifndef _GNU_SOURCE\n"
 270           "#define _GNU_SOURCE\n"
 271           "#endif\n"
 272           "#include <string.h>\n"
 273           "static void *func(void *s, int c, size_t n) {\n"
 274           "return memrchr(s, c, n);"
 275           "}\n", },
 276         { "HAVE_MMAP", "DEFINES_FUNC", NULL, NULL,
 277           "#include <sys/mman.h>\n"
 278           "static void *func(int fd) {\n"
 279           "     return mmap(0, 65536, PROT_READ, MAP_SHARED, fd, 0);\n"
 280           "}" },
 281         { "HAVE_PROC_SELF_MAPS", "DEFINES_EVERYTHING|EXECUTE|MAY_NOT_COMPILE", NULL, NULL,
 282           "#include <sys/types.h>\n"
 283           "#include <sys/stat.h>\n"
 284           "#include <fcntl.h>\n"
 285           "int main(void) {\n"
 286           "     return open(\"/proc/self/maps\", O_RDONLY) != -1 ? 0 : 1;\n"
 287           "}\n" },
 288         { "HAVE_QSORT_R_PRIVATE_LAST",
 289           "DEFINES_EVERYTHING|EXECUTE|MAY_NOT_COMPILE", NULL, NULL,
 290           "#ifndef _GNU_SOURCE\n"
 291           "#define _GNU_SOURCE\n"
 292           "#endif\n"
 293           "#include <stdlib.h>\n"
 294           "static int cmp(const void *lp, const void *rp, void *priv) {\n"
 295           " *(unsigned int *)priv = 1;\n"
 296           " return *(const int *)lp - *(const int *)rp; }\n"
 297           "int main(void) {\n"
 298           " int array[] = { 9, 2, 5 };\n"
 299           " unsigned int called = 0;\n"
 300           " qsort_r(array, 3, sizeof(int), cmp, &called);\n"
 301           " return called && array[0] == 2 && array[1] == 5 && array[2] == 9 ? 0 : 1;\n"
 302           "}\n" },
 303         { "HAVE_STRUCT_TIMESPEC",
 304           "DEFINES_FUNC", NULL, NULL,
 305           "#include <time.h>\n"
 306           "static void func(void) {\n"
 307           "     struct timespec ts;\n"
 308           "     ts.tv_sec = ts.tv_nsec = 1;\n"
 309           "}\n" },
 310         { "HAVE_SECTION_START_STOP",
 311           "DEFINES_FUNC", NULL, NULL,
 312           "static void *__attribute__((__section__(\"mysec\"))) p = &p;\n"
 313           "static int func(void) {\n"
 314           "     extern void *__start_mysec[], *__stop_mysec[];\n"
 315           "     return __stop_mysec - __start_mysec;\n"
 316           "}\n" },
 317         { "HAVE_STACK_GROWS_UPWARDS", "DEFINES_EVERYTHING|EXECUTE", NULL, NULL,
 318           "#include <stddef.h>\n"
 319           "static ptrdiff_t nest(const void *base, unsigned int i)\n"
 320           "{\n"
 321           "     if (i == 0)\n"
 322           "             return (const char *)&i - (const char *)base;\n"
 323           "     return nest(base, i-1);\n"
 324           "}\n"
 325           "int main(int argc, char *argv[]) {\n"
 326           "     (void)argv;\n"
 327           "     return (nest(&argc, argc) > 0) ? 0 : 1;\n"
 328           "}\n" },
 329         { "HAVE_STATEMENT_EXPR", "INSIDE_MAIN", NULL, NULL,
 330           "return ({ int x = argc; x == argc ? 0 : 1; });" },
 331         { "HAVE_SYS_FILIO_H", "OUTSIDE_MAIN", NULL, NULL, /* Solaris needs this for FIONREAD */
 332           "#include <sys/filio.h>\n" },
 333         { "HAVE_SYS_TERMIOS_H", "OUTSIDE_MAIN", NULL, NULL,
 334           "#include <sys/termios.h>\n" },
 335         { "HAVE_SYS_UNISTD_H", "OUTSIDE_MAIN", NULL, NULL,
 336           "#include <sys/unistd.h>\n" },
 337         { "HAVE_TYPEOF", "INSIDE_MAIN", NULL, NULL,
 338           "__typeof__(argc) i; i = argc; return i == argc ? 0 : 1;" },
 339         { "HAVE_UNALIGNED_ACCESS", "DEFINES_EVERYTHING|EXECUTE", NULL, NULL,
 340           "#include <string.h>\n"
 341           "int main(int argc, char *argv[]) {\n"
 342           "     (void)argc;\n"
 343           "     char pad[sizeof(int *) * 1];\n"
 344           "     strncpy(pad, argv[0], sizeof(pad));\n"
 345           "     int *x = (int *)pad, *y = (int *)(pad + 1);\n"
 346           "     return *x == *y;\n"
 347           "}\n" },
 348         { "HAVE_UTIME", "DEFINES_FUNC", NULL, NULL,
 349           "#include <sys/types.h>\n"
 350           "#include <utime.h>\n"
 351           "static int func(const char *filename) {\n"
 352           "     struct utimbuf times = { 0 };\n"
 353           "     return utime(filename, &times);\n"
 354           "}" },
 355         { "HAVE_WARN_UNUSED_RESULT", "DEFINES_FUNC", NULL, NULL,
 356           "#include <sys/types.h>\n"
 357           "#include <utime.h>\n"
 358           "static __attribute__((warn_unused_result)) int func(int i) {\n"
 359           "     return i + 1;\n"
 360           "}" },
 361         { "HAVE_OPENMP", "INSIDE_MAIN", NULL, NULL,
 362           "int i;\n"
 363           "#pragma omp parallel for\n"
 364           "for(i = 0; i < 0; i++) {};\n"
 365           "return 0;\n",
 366           "-Werror -fopenmp" },
 367         { "HAVE_VALGRIND_MEMCHECK_H", "OUTSIDE_MAIN", NULL, NULL,
 368           "#include <valgrind/memcheck.h>\n" },
 369         { "HAVE_UCONTEXT", "DEFINES_EVERYTHING|EXECUTE|MAY_NOT_COMPILE",
 370           NULL, NULL,
 371           "#include <ucontext.h>\n"
 372           "static int x = 0;\n"
 373           "static char stack[2048];\n"
 374           "static ucontext_t a, b;\n"
 375           "static void fn(void) {\n"
 376           "     x |= 2;\n"
 377           "     setcontext(&b);\n"
 378           "     x |= 4;\n"
 379           "}\n"
 380           "int main(void) {\n"
 381           "     x |= 1;\n"
 382           "     getcontext(&a);\n"
 383           "     a.uc_stack.ss_sp = stack;\n"
 384           "     a.uc_stack.ss_size = sizeof(stack);\n"
 385           "     makecontext(&a, fn, 0);\n"
 386           "     swapcontext(&b, &a);\n"
 387           "     return (x == 3) ? 0 : 1;\n"
 388           "}\n"
 389         },
 390         { "HAVE_POINTER_SAFE_MAKECONTEXT", "DEFINES_EVERYTHING|EXECUTE|MAY_NOT_COMPILE",
 391           "HAVE_UCONTEXT", NULL,
 392           "#include <stddef.h>\n"
 393           "#include <ucontext.h>\n"
 394           "static int worked = 0;\n"
 395           "static char stack[1024];\n"
 396           "static ucontext_t a, b;\n"
 397           "static void fn(void *p, void *q) {\n"
 398           "     void *cp = &worked;\n"
 399           "     void *cq = (void *)(~((ptrdiff_t)cp));\n"
 400           "     if ((p == cp) && (q == cq))\n"
 401           "             worked = 1;\n"
 402           "     setcontext(&b);\n"
 403           "}\n"
 404           "int main(void) {\n"
 405           "     void *ap = &worked;\n"
 406           "     void *aq = (void *)(~((ptrdiff_t)ap));\n"
 407           "     getcontext(&a);\n"
 408           "     a.uc_stack.ss_sp = stack;\n"
 409           "     a.uc_stack.ss_size = sizeof(stack);\n"
 410           "     makecontext(&a, (void (*)(void))fn, 2, ap, aq);\n"
 411           "     swapcontext(&b, &a);\n"
 412           "     return worked ? 0 : 1;\n"
 413           "}\n"
 414         },
 415 };
 416
 417 static void c12r_err(int eval, const char *fmt, ...)
 418 {
 419         int err_errno = errno;
 420         va_list ap;
 421
 422         fprintf(stderr, "%s: ", progname);
 423         va_start(ap, fmt);
 424         vfprintf(stderr, fmt, ap);
 425         va_end(ap);
 426         fprintf(stderr, ": %s\n", strerror(err_errno));
 427         exit(eval);
 428 }
 429
 430 static void c12r_errx(int eval, const char *fmt, ...)
 431 {
 432         va_list ap;
 433
 434         fprintf(stderr, "%s: ", progname);
 435         va_start(ap, fmt);
 436         vfprintf(stderr, fmt, ap);
 437         va_end(ap);
 438         fprintf(stderr, "\n");
 439         exit(eval);
 440 }
 441
 442 static void start_test(const char *what, const char *why)
 443 {
 444         if (like_a_libtool) {
 445                 printf("%s%s... ", what, why);
 446                 fflush(stdout);
 447         }
 448 }
 449
 450 static void end_test(bool result)
 451 {
 452         if (like_a_libtool)
 453                 printf("%s\n", result ? "yes" : "no");
 454 }
 455
 456 static size_t fcopy(FILE *fsrc, FILE *fdst)
 457 {
 458         char buffer[BUFSIZ];
 459         size_t rsize, wsize;
 460         size_t copied = 0;
 461
 462         while ((rsize = fread(buffer, 1, BUFSIZ, fsrc)) > 0) {
 463                 wsize = fwrite(buffer, 1, rsize, fdst);
 464                 copied += wsize;
 465                 if (wsize != rsize)
 466                         break;
 467         }
 468
 469         return copied;
 470 }
 471
 472 static char *grab_stream(FILE *file)
 473 {
 474         size_t max, ret, size = 0;
 475         char *buffer;
 476
 477         max = BUFSIZ;
 478         buffer = malloc(max);
 479         while ((ret = fread(buffer+size, 1, max - size, file)) == max - size) {
 480                 size += ret;
 481                 buffer = realloc(buffer, max *= 2);
 482         }
 483         size += ret;
 484         if (ferror(file))
 485                 c12r_err(1, "reading from command");
 486         buffer[size] = '\0';
 487         return buffer;
 488 }
 489
 490 static char *run(const char *cmd, int *exitstatus)
 491 {
 492         static const char redir[] = " 2>&1";
 493         size_t cmdlen;
 494         char *cmdredir;
 495         FILE *cmdout;
 496         char *ret;
 497
 498         cmdlen = strlen(cmd);
 499         cmdredir = malloc(cmdlen + sizeof(redir));
 500         memcpy(cmdredir, cmd, cmdlen);
 501         memcpy(cmdredir + cmdlen, redir, sizeof(redir));
 502
 503         cmdout = popen(cmdredir, "r");
 504         if (!cmdout)
 505                 c12r_err(1, "popen \"%s\"", cmdredir);
 506
 507         free(cmdredir);
 508
 509         ret = grab_stream(cmdout);
 510         *exitstatus = pclose(cmdout);
 511         return ret;
 512 }
 513
 514 static char *connect_args(const char *argv[], const char *outflag,
 515                 const char *files)
 516 {
 517         unsigned int i;
 518         char *ret;
 519         size_t len = strlen(outflag) + strlen(files) + 1;
 520
 521         for (i = 1; argv[i]; i++)
 522                 len += 1 + strlen(argv[i]);
 523
 524         ret = malloc(len);
 525         len = 0;
 526         for (i = 1; argv[i]; i++) {
 527                 strcpy(ret + len, argv[i]);
 528                 len += strlen(argv[i]);
 529                 if (argv[i+1] || *outflag)
 530                         ret[len++] = ' ';
 531         }
 532         strcpy(ret + len, outflag);
 533         len += strlen(outflag);
 534         strcpy(ret + len, files);
 535         return ret;
 536 }
 537
 538 static struct test *find_test(const char *name)
 539 {
 540         unsigned int i;
 541
 542         for (i = 0; i < sizeof(tests)/sizeof(tests[0]); i++) {
 543                 if (strcmp(tests[i].name, name) == 0)
 544                         return &tests[i];
 545         }
 546         abort();
 547 }
 548
 549 #define PRE_BOILERPLATE "/* Test program generated by configurator. */\n"
 550 #define MAIN_START_BOILERPLATE \
 551         "int main(int argc, char *argv[]) {\n" \
 552         "       (void)argc;\n" \
 553         "       (void)argv;\n"
 554 #define USE_FUNC_BOILERPLATE "(void)func;\n"
 555 #define MAIN_BODY_BOILERPLATE "return 0;\n"
 556 #define MAIN_END_BOILERPLATE "}\n"
 557
 558 static bool run_test(const char *cmd, struct test *test)
 559 {
 560         char *output, *newcmd;
 561         FILE *outf;
 562         int status;
 563
 564         if (test->done)
 565                 return test->answer;
 566
 567         if (test->depends) {
 568                 size_t len;
 569                 const char *deps = test->depends;
 570                 char *dep;
 571
 572                 /* Space-separated dependencies, could be ! for inverse. */
 573                 while ((len = strcspn(deps, " ")) != 0) {
 574                         bool positive = true;
 575                         if (deps[len]) {
 576                                 dep = strdup(deps);
 577                                 dep[len] = '\0';
 578                         } else {
 579                                 dep = (char *)deps;
 580                         }
 581
 582                         if (dep[0] == '!') {
 583                                 dep++;
 584                                 positive = false;
 585                         }
 586                         if (run_test(cmd, find_test(dep)) != positive) {
 587                                 test->answer = false;
 588                                 test->done = true;
 589                                 return test->answer;
 590                         }
 591                         if (deps[len])
 592                                 free(dep);
 593
 594                         deps += len;
 595                         deps += strspn(deps, " ");
 596                 }
 597         }
 598
 599         outf = fopen(INPUT_FILE, verbose > 1 ? "w+" : "w");
 600         if (!outf)
 601                 c12r_err(1, "creating %s", INPUT_FILE);
 602
 603         fprintf(outf, "%s", PRE_BOILERPLATE);
 604
 605         if (strstr(test->style, "INSIDE_MAIN")) {
 606                 fprintf(outf, "%s", MAIN_START_BOILERPLATE);
 607                 fprintf(outf, "%s", test->fragment);
 608                 fprintf(outf, "%s", MAIN_END_BOILERPLATE);
 609         } else if (strstr(test->style, "OUTSIDE_MAIN")) {
 610                 fprintf(outf, "%s", test->fragment);
 611                 fprintf(outf, "%s", MAIN_START_BOILERPLATE);
 612                 fprintf(outf, "%s", MAIN_BODY_BOILERPLATE);
 613                 fprintf(outf, "%s", MAIN_END_BOILERPLATE);
 614         } else if (strstr(test->style, "DEFINES_FUNC")) {
 615                 fprintf(outf, "%s", test->fragment);
 616                 fprintf(outf, "%s", MAIN_START_BOILERPLATE);
 617                 fprintf(outf, "%s", USE_FUNC_BOILERPLATE);
 618                 fprintf(outf, "%s", MAIN_BODY_BOILERPLATE);
 619                 fprintf(outf, "%s", MAIN_END_BOILERPLATE);
 620         } else if (strstr(test->style, "DEFINES_EVERYTHING")) {
 621                 fprintf(outf, "%s", test->fragment);
 622         } else
 623                 c12r_errx(2, "Unknown style for test %s: %s",
 624                           test->name, test->style);
 625
 626         if (verbose > 1) {
 627                 fseek(outf, 0, SEEK_SET);
 628                 fcopy(outf, stdout);
 629         }
 630
 631         fclose(outf);
 632
 633         newcmd = strdup(cmd);
 634
 635         if (test->flags) {
 636                 newcmd = realloc(newcmd, strlen(newcmd) + strlen(" ")
 637                                 + strlen(test->flags) + 1);
 638                 strcat(newcmd, " ");
 639                 strcat(newcmd, test->flags);
 640                 if (verbose > 1)
 641                         printf("Extra flags line: %s", newcmd);
 642         }
 643
 644         if (test->link) {
 645                 newcmd = realloc(newcmd, strlen(newcmd) + strlen(" ")
 646                                 + strlen(test->link) + 1);
 647                 strcat(newcmd, " ");
 648                 strcat(newcmd, test->link);
 649                 if (verbose > 1)
 650                         printf("Extra link line: %s", newcmd);
 651         }
 652
 653         start_test("checking for ", test->name);
 654         output = run(newcmd, &status);
 655
 656         free(newcmd);
 657
 658         if (status != 0 || strstr(output, "warning")) {
 659                 if (verbose)
 660                         printf("Compile %s for %s, status %i: %s\n",
 661                                status ? "fail" : "warning",
 662                                test->name, status, output);
 663                 if (strstr(test->style, "EXECUTE")
 664                     && !strstr(test->style, "MAY_NOT_COMPILE"))
 665                         c12r_errx(1, "Test for %s did not compile:\n%s",
 666                                   test->name, output);
 667                 test->answer = false;
 668                 free(output);
 669         } else {
 670                 /* Compile succeeded. */
 671                 free(output);
 672                 /* We run INSIDE_MAIN tests for sanity checking. */
 673                 if (strstr(test->style, "EXECUTE")
 674                     || strstr(test->style, "INSIDE_MAIN")) {
 675                         output = run("." DIR_SEP OUTPUT_FILE, &status);
 676                         if (!strstr(test->style, "EXECUTE") && status != 0)
 677                                 c12r_errx(1, "Test for %s failed with %i:\n%s",
 678                                           test->name, status, output);
 679                         if (verbose && status)
 680                                 printf("%s exited %i\n", test->name, status);
 681                         free(output);
 682                 }
 683                 test->answer = (status == 0);
 684         }
 685         test->done = true;
 686         end_test(test->answer);
 687
 688         if (test->answer && test->overrides) {
 689                 struct test *override = find_test(test->overrides);
 690                 override->done = true;
 691                 override->answer = true;
 692         }
 693         return test->answer;
 694 }
 695
 696 int main(int argc, const char *argv[])
 697 {
 698         char *cmd;
 699         unsigned int i;
 700         const char *default_args[]
 701                 = { "", DEFAULT_COMPILER, DEFAULT_FLAGS, NULL };
 702         const char *outflag = DEFAULT_OUTPUT_EXE_FLAG;
 703         const char *configurator_cc = NULL;
 704         const char *orig_cc;
 705         const char *varfile = NULL;
 706         const char *headerfile = NULL;
 707         FILE *outf;
 708
 709         if (argc > 0)
 710                 progname = argv[0];
 711
 712         while (argc > 1) {
 713                 if (strcmp(argv[1], "--help") == 0) {
 714                         printf("Usage: configurator [-v] [--var-file=<filename>] [-O<outflag>] [--configurator-cc=<compiler-for-tests>] [--autotools-style] [<compiler> <flags>...]\n"
 715                                "  <compiler> <flags> will have \"<outflag> <outfile> <infile.c>\" appended\n"
 716                                "Default: %s %s %s\n",
 717                                DEFAULT_COMPILER, DEFAULT_FLAGS,
 718                                DEFAULT_OUTPUT_EXE_FLAG);
 719                         exit(0);
 720                 }
 721                 if (strncmp(argv[1], "-O", 2) == 0) {
 722                         argc--;
 723                         argv++;
 724                         outflag = argv[1] + 2;
 725                         if (!*outflag) {
 726                                 fprintf(stderr,
 727                                         "%s: option requires an argument -- O\n",
 728                                         argv[0]);
 729                                 exit(1);
 730                         }
 731                 } else if (strcmp(argv[1], "-v") == 0) {
 732                         argc--;
 733                         argv++;
 734                         verbose++;
 735                 } else if (strcmp(argv[1], "-vv") == 0) {
 736                         argc--;
 737                         argv++;
 738                         verbose += 2;
 739                 } else if (strncmp(argv[1], "--configurator-cc=", 18) == 0) {
 740                         configurator_cc = argv[1] + 18;
 741                         argc--;
 742                         argv++;
 743                 } else if (strncmp(argv[1], "--var-file=", 11) == 0) {
 744                         varfile = argv[1] + 11;
 745                         argc--;
 746                         argv++;
 747                 } else if (strcmp(argv[1], "--autotools-style") == 0) {
 748                         like_a_libtool = true;
 749                         argc--;
 750                         argv++;
 751                 } else if (strncmp(argv[1], "--header-file=", 14) == 0) {
 752                         headerfile = argv[1] + 14;
 753                         argc--;
 754                         argv++;
 755                 } else {
 756                         break;
 757                 }
 758         }
 759
 760         if (argc == 1)
 761                 argv = default_args;
 762
 763         orig_cc = argv[1];
 764         if (configurator_cc)
 765                 argv[1] = configurator_cc;
 766
 767         cmd = connect_args(argv, outflag, OUTPUT_FILE " " INPUT_FILE);
 768         if (like_a_libtool) {
 769                 start_test("Making autoconf users comfortable", "");
 770                 sleep(1);
 771                 end_test(1);
 772         }
 773         for (i = 0; i < sizeof(tests)/sizeof(tests[0]); i++)
 774                 run_test(cmd, &tests[i]);
 775         free(cmd);
 776
 777         remove(OUTPUT_FILE);
 778         remove(INPUT_FILE);
 779
 780         if (varfile) {
 781                 FILE *vars;
 782
 783                 if (strcmp(varfile, "-") == 0)
 784                         vars = stdout;
 785                 else {
 786                         start_test("Writing variables to ", varfile);
 787                         vars = fopen(varfile, "a");
 788                         if (!vars)
 789                                 c12r_err(2, "Could not open %s", varfile);
 790                 }
 791                 for (i = 0; i < sizeof(tests)/sizeof(tests[0]); i++)
 792                         fprintf(vars, "%s=%u\n", tests[i].name, tests[i].answer);
 793                 if (vars != stdout) {
 794                         if (fclose(vars) != 0)
 795                                 c12r_err(2, "Closing %s", varfile);
 796                         end_test(1);
 797                 }
 798         }
 799
 800         if (headerfile) {
 801                 start_test("Writing header to ", headerfile);
 802                 outf = fopen(headerfile, "w");
 803                 if (!outf)
 804                         c12r_err(2, "Could not open %s", headerfile);
 805         } else
 806                 outf = stdout;
 807
 808         fprintf(outf, "/* Generated by CCAN configurator */\n"
 809                "#ifndef CCAN_CONFIG_H\n"
 810                "#define CCAN_CONFIG_H\n");
 811         fprintf(outf, "#ifndef _GNU_SOURCE\n");
 812         fprintf(outf, "#define _GNU_SOURCE /* Always use GNU extensions. */\n");
 813         fprintf(outf, "#endif\n");
 814         fprintf(outf, "#define CCAN_COMPILER \"%s\"\n", orig_cc);
 815         cmd = connect_args(argv + 1, "", "");
 816         fprintf(outf, "#define CCAN_CFLAGS \"%s\"\n", cmd);
 817         free(cmd);
 818         fprintf(outf, "#define CCAN_OUTPUT_EXE_CFLAG \"%s\"\n\n", outflag);
 819         /* This one implies "#include <ccan/..." works, eg. for tdb2.h */
 820         fprintf(outf, "#define HAVE_CCAN 1\n");
 821         for (i = 0; i < sizeof(tests)/sizeof(tests[0]); i++)
 822                 fprintf(outf, "#define %s %u\n", tests[i].name, tests[i].answer);
 823         fprintf(outf, "#endif /* CCAN_CONFIG_H */\n");
 824
 825         if (headerfile) {
 826                 if (fclose(outf) != 0)
 827                         c12r_err(2, "Closing %s", headerfile);
 828                 end_test(1);
 829         }
 830
 831         return 0;
 832 }