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) \n"
 106           "             p = NULL;\n"
 107           "     return p;\n"
 108           "}" },
 109         { "HAVE_ATTRIBUTE_COLD", DEFINES_FUNC, NULL, NULL,
 110           "static int __attribute__((cold)) func(int x) { return x; }" },
 111         { "HAVE_ATTRIBUTE_CONST", DEFINES_FUNC, NULL, NULL,
 112           "static int __attribute__((const)) func(int x) { return x; }" },
 113         { "HAVE_ATTRIBUTE_PURE", DEFINES_FUNC, NULL, NULL,
 114           "static int __attribute__((pure)) func(int x) { return x; }" },
 115         { "HAVE_ATTRIBUTE_MAY_ALIAS", OUTSIDE_MAIN, NULL, NULL,
 116           "typedef short __attribute__((__may_alias__)) short_a;" },
 117         { "HAVE_ATTRIBUTE_NORETURN", DEFINES_FUNC, NULL, NULL,
 118           "#include <stdlib.h>\n"
 119           "static void __attribute__((noreturn)) func(int x) { exit(x); }" },
 120         { "HAVE_ATTRIBUTE_PRINTF", DEFINES_FUNC, NULL, NULL,
 121           "static void __attribute__((format(__printf__, 1, 2))) func(const char *fmt, ...) { (void)fmt; }" },
 122         { "HAVE_ATTRIBUTE_UNUSED", OUTSIDE_MAIN, NULL, NULL,
 123           "static int __attribute__((unused)) func(int x) { return x; }" },
 124         { "HAVE_ATTRIBUTE_USED", OUTSIDE_MAIN, NULL, NULL,
 125           "static int __attribute__((used)) func(int x) { return x; }" },
 126         { "HAVE_BACKTRACE", DEFINES_FUNC, NULL, NULL,
 127           "#include <execinfo.h>\n"
 128           "static int func(int x) {"
 129           "     void *bt[10];\n"
 130           "     return backtrace(bt, 10) < x;\n"
 131           "}" },
 132         { "HAVE_BIG_ENDIAN", INSIDE_MAIN|EXECUTE, NULL, NULL,
 133           "union { int i; char c[sizeof(int)]; } u;\n"
 134           "u.i = 0x01020304;\n"
 135           "return u.c[0] == 0x01 && u.c[1] == 0x02 && u.c[2] == 0x03 && u.c[3] == 0x04 ? 0 : 1;" },
 136         { "HAVE_BSWAP_64", DEFINES_FUNC, "HAVE_BYTESWAP_H", NULL,
 137           "#include <byteswap.h>\n"
 138           "static int func(int x) { return bswap_64(x); }" },
 139         { "HAVE_BUILTIN_CHOOSE_EXPR", INSIDE_MAIN, NULL, NULL,
 140           "return __builtin_choose_expr(1, 0, \"garbage\");" },
 141         { "HAVE_BUILTIN_CLZ", INSIDE_MAIN, NULL, NULL,
 142           "return __builtin_clz(1) == (sizeof(int)*8 - 1) ? 0 : 1;" },
 143         { "HAVE_BUILTIN_CLZL", INSIDE_MAIN, NULL, NULL,
 144           "return __builtin_clzl(1) == (sizeof(long)*8 - 1) ? 0 : 1;" },
 145         { "HAVE_BUILTIN_CLZLL", INSIDE_MAIN, NULL, NULL,
 146           "return __builtin_clzll(1) == (sizeof(long long)*8 - 1) ? 0 : 1;" },
 147         { "HAVE_BUILTIN_CTZ", INSIDE_MAIN, NULL, NULL,
 148           "return __builtin_ctz(1 << (sizeof(int)*8 - 1)) == (sizeof(int)*8 - 1) ? 0 : 1;" },
 149         { "HAVE_BUILTIN_CTZL", INSIDE_MAIN, NULL, NULL,
 150           "return __builtin_ctzl(1UL << (sizeof(long)*8 - 1)) == (sizeof(long)*8 - 1) ? 0 : 1;" },
 151         { "HAVE_BUILTIN_CTZLL", INSIDE_MAIN, NULL, NULL,
 152           "return __builtin_ctzll(1ULL << (sizeof(long long)*8 - 1)) == (sizeof(long long)*8 - 1) ? 0 : 1;" },
 153         { "HAVE_BUILTIN_CONSTANT_P", INSIDE_MAIN, NULL, NULL,
 154           "return __builtin_constant_p(1) ? 0 : 1;" },
 155         { "HAVE_BUILTIN_EXPECT", INSIDE_MAIN, NULL, NULL,
 156           "return __builtin_expect(argc == 1, 1) ? 0 : 1;" },
 157         { "HAVE_BUILTIN_FFS", INSIDE_MAIN, NULL, NULL,
 158           "return __builtin_ffs(0) == 0 ? 0 : 1;" },
 159         { "HAVE_BUILTIN_FFSL", INSIDE_MAIN, NULL, NULL,
 160           "return __builtin_ffsl(0L) == 0 ? 0 : 1;" },
 161         { "HAVE_BUILTIN_FFSLL", INSIDE_MAIN, NULL, NULL,
 162           "return __builtin_ffsll(0LL) == 0 ? 0 : 1;" },
 163         { "HAVE_BUILTIN_POPCOUNT", INSIDE_MAIN, NULL, NULL,
 164           "return __builtin_popcount(255) == 8 ? 0 : 1;" },
 165         { "HAVE_BUILTIN_POPCOUNTL", INSIDE_MAIN, NULL, NULL,
 166           "return __builtin_popcountl(255L) == 8 ? 0 : 1;" },
 167         { "HAVE_BUILTIN_POPCOUNTLL", INSIDE_MAIN, NULL, NULL,
 168           "return __builtin_popcountll(255LL) == 8 ? 0 : 1;" },
 169         { "HAVE_BUILTIN_TYPES_COMPATIBLE_P", INSIDE_MAIN, NULL, NULL,
 170           "return __builtin_types_compatible_p(char *, int) ? 1 : 0;" },
 171         { "HAVE_ICCARM_INTRINSICS", DEFINES_FUNC, NULL, NULL,
 172           "#include <intrinsics.h>\n"
 173           "int func(int v) {\n"
 174           "     return __CLZ(__RBIT(v));\n"
 175           "}" },
 176         { "HAVE_BYTESWAP_H", OUTSIDE_MAIN, NULL, NULL,
 177           "#include <byteswap.h>\n" },
 178         { "HAVE_CLOCK_GETTIME",
 179           DEFINES_FUNC, "HAVE_STRUCT_TIMESPEC", NULL,
 180           "#include <time.h>\n"
 181           "static struct timespec func(void) {\n"
 182           "     struct timespec ts;\n"
 183           "     clock_gettime(CLOCK_REALTIME, &ts);\n"
 184           "     return ts;\n"
 185           "}\n" },
 186         { "HAVE_CLOCK_GETTIME_IN_LIBRT",
 187           DEFINES_FUNC,
 188           "HAVE_STRUCT_TIMESPEC !HAVE_CLOCK_GETTIME",
 189           "-lrt",
 190           "#include <time.h>\n"
 191           "static struct timespec func(void) {\n"
 192           "     struct timespec ts;\n"
 193           "     clock_gettime(CLOCK_REALTIME, &ts);\n"
 194           "     return ts;\n"
 195           "}\n",
 196           /* This means HAVE_CLOCK_GETTIME, too */
 197           "HAVE_CLOCK_GETTIME" },
 198         { "HAVE_COMPOUND_LITERALS", INSIDE_MAIN, NULL, NULL,
 199           "int *foo = (int[]) { 1, 2, 3, 4 };\n"
 200           "return foo[0] ? 0 : 1;" },
 201         { "HAVE_FCHDIR", DEFINES_EVERYTHING|EXECUTE|MAY_NOT_COMPILE, NULL, NULL,
 202           "#include <sys/types.h>\n"
 203           "#include <sys/stat.h>\n"
 204           "#include <fcntl.h>\n"
 205           "#include <unistd.h>\n"
 206           "int main(void) {\n"
 207           "     int fd = open(\"..\", O_RDONLY);\n"
 208           "     return fchdir(fd) == 0 ? 0 : 1;\n"
 209           "}\n" },
 210         { "HAVE_ERR_H", DEFINES_FUNC, NULL, NULL,
 211           "#include <err.h>\n"
 212           "static void func(int arg) {\n"
 213           "     if (arg == 0)\n"
 214           "             err(1, \"err %u\", arg);\n"
 215           "     if (arg == 1)\n"
 216           "             errx(1, \"err %u\", arg);\n"
 217           "     if (arg == 3)\n"
 218           "             warn(\"warn %u\", arg);\n"
 219           "     if (arg == 4)\n"
 220           "             warnx(\"warn %u\", arg);\n"
 221           "}\n" },
 222         { "HAVE_FILE_OFFSET_BITS", DEFINES_EVERYTHING|EXECUTE|MAY_NOT_COMPILE,
 223           "HAVE_32BIT_OFF_T", NULL,
 224           "#define _FILE_OFFSET_BITS 64\n"
 225           "#include <sys/types.h>\n"
 226           "int main(void) {\n"
 227           "     return sizeof(off_t) == 8 ? 0 : 1;\n"
 228           "}\n" },
 229         { "HAVE_FOR_LOOP_DECLARATION", INSIDE_MAIN, NULL, NULL,
 230           "int ret = 1;\n"
 231           "for (int i = 0; i < argc; i++) { ret = 0; };\n"
 232           "return ret;" },
 233         { "HAVE_FLEXIBLE_ARRAY_MEMBER", OUTSIDE_MAIN, NULL, NULL,
 234           "struct foo { unsigned int x; int arr[]; };" },
 235         { "HAVE_GETPAGESIZE", DEFINES_FUNC, NULL, NULL,
 236           "#include <unistd.h>\n"
 237           "static int func(void) { return getpagesize(); }" },
 238         { "HAVE_ISBLANK", DEFINES_FUNC, NULL, NULL,
 239           "#ifndef _GNU_SOURCE\n"
 240           "#define _GNU_SOURCE\n"
 241           "#endif\n"
 242           "#include <ctype.h>\n"
 243           "static int func(void) { return isblank(' '); }" },
 244         { "HAVE_LITTLE_ENDIAN", INSIDE_MAIN|EXECUTE, NULL, NULL,
 245           "union { int i; char c[sizeof(int)]; } u;\n"
 246           "u.i = 0x01020304;\n"
 247           "return u.c[0] == 0x04 && u.c[1] == 0x03 && u.c[2] == 0x02 && u.c[3] == 0x01 ? 0 : 1;" },
 248         { "HAVE_MEMMEM", DEFINES_FUNC, NULL, NULL,
 249           "#ifndef _GNU_SOURCE\n"
 250           "#define _GNU_SOURCE\n"
 251           "#endif\n"
 252           "#include <string.h>\n"
 253           "static void *func(void *h, size_t hl, void *n, size_t nl) {\n"
 254           "return memmem(h, hl, n, nl);"
 255           "}\n", },
 256         { "HAVE_MEMRCHR", DEFINES_FUNC, NULL, NULL,
 257           "#ifndef _GNU_SOURCE\n"
 258           "#define _GNU_SOURCE\n"
 259           "#endif\n"
 260           "#include <string.h>\n"
 261           "static void *func(void *s, int c, size_t n) {\n"
 262           "return memrchr(s, c, n);"
 263           "}\n", },
 264         { "HAVE_MMAP", DEFINES_FUNC, NULL, NULL,
 265           "#include <sys/mman.h>\n"
 266           "static void *func(int fd) {\n"
 267           "     return mmap(0, 65536, PROT_READ, MAP_SHARED, fd, 0);\n"
 268           "}" },
 269         { "HAVE_PROC_SELF_MAPS", DEFINES_EVERYTHING|EXECUTE|MAY_NOT_COMPILE, NULL, NULL,
 270           "#include <sys/types.h>\n"
 271           "#include <sys/stat.h>\n"
 272           "#include <fcntl.h>\n"
 273           "int main(void) {\n"
 274           "     return open(\"/proc/self/maps\", O_RDONLY) != -1 ? 0 : 1;\n"
 275           "}\n" },
 276         { "HAVE_QSORT_R_PRIVATE_LAST",
 277           DEFINES_EVERYTHING|EXECUTE|MAY_NOT_COMPILE, NULL, NULL,
 278           "#ifndef _GNU_SOURCE\n"
 279           "#define _GNU_SOURCE\n"
 280           "#endif\n"
 281           "#include <stdlib.h>\n"
 282           "static int cmp(const void *lp, const void *rp, void *priv) {\n"
 283           " *(unsigned int *)priv = 1;\n"
 284           " return *(const int *)lp - *(const int *)rp; }\n"
 285           "int main(void) {\n"
 286           " int array[] = { 9, 2, 5 };\n"
 287           " unsigned int called = 0;\n"
 288           " qsort_r(array, 3, sizeof(int), cmp, &called);\n"
 289           " return called && array[0] == 2 && array[1] == 5 && array[2] == 9 ? 0 : 1;\n"
 290           "}\n" },
 291         { "HAVE_STRUCT_TIMESPEC",
 292           DEFINES_FUNC, NULL, NULL,
 293           "#include <time.h>\n"
 294           "static void func(void) {\n"
 295           "     struct timespec ts;\n"
 296           "     ts.tv_sec = ts.tv_nsec = 1;\n"
 297           "}\n" },
 298         { "HAVE_SECTION_START_STOP",
 299           DEFINES_FUNC, NULL, NULL,
 300           "static void *__attribute__((__section__(\"mysec\"))) p = &p;\n"
 301           "static int func(void) {\n"
 302           "     extern void *__start_mysec[], *__stop_mysec[];\n"
 303           "     return __stop_mysec - __start_mysec;\n"
 304           "}\n" },
 305         { "HAVE_STACK_GROWS_UPWARDS", DEFINES_EVERYTHING|EXECUTE, NULL, NULL,
 306           "#include <stddef.h>\n"
 307           "static ptrdiff_t nest(const void *base, unsigned int i)\n"
 308           "{\n"
 309           "     if (i == 0)\n"
 310           "             return (const char *)&i - (const char *)base;\n"
 311           "     return nest(base, i-1);\n"
 312           "}\n"
 313           "int main(int argc, char *argv[]) {\n"
 314           "     (void)argv;\n"
 315           "     return (nest(&argc, argc) > 0) ? 0 : 1;\n"
 316           "}\n" },
 317         { "HAVE_STATEMENT_EXPR", INSIDE_MAIN, NULL, NULL,
 318           "return ({ int x = argc; x == argc ? 0 : 1; });" },
 319         { "HAVE_SYS_FILIO_H", OUTSIDE_MAIN, NULL, NULL, /* Solaris needs this for FIONREAD */
 320           "#include <sys/filio.h>\n" },
 321         { "HAVE_SYS_TERMIOS_H", OUTSIDE_MAIN, NULL, NULL,
 322           "#include <sys/termios.h>\n" },
 323         { "HAVE_SYS_UNISTD_H", OUTSIDE_MAIN, NULL, NULL,
 324           "#include <sys/unistd.h>\n" },
 325         { "HAVE_TYPEOF", INSIDE_MAIN, NULL, NULL,
 326           "__typeof__(argc) i; i = argc; return i == argc ? 0 : 1;" },
 327         { "HAVE_UNALIGNED_ACCESS", DEFINES_EVERYTHING|EXECUTE, NULL, NULL,
 328           "#include <string.h>\n"
 329           "int main(int argc, char *argv[]) {\n"
 330           "     (void)argc;\n"
 331           "     char pad[sizeof(int *) * 1];\n"
 332           "     strncpy(pad, argv[0], sizeof(pad));\n"
 333           "     int *x = (int *)pad, *y = (int *)(pad + 1);\n"
 334           "     return *x == *y;\n"
 335           "}\n" },
 336         { "HAVE_UTIME", DEFINES_FUNC, NULL, NULL,
 337           "#include <sys/types.h>\n"
 338           "#include <utime.h>\n"
 339           "static int func(const char *filename) {\n"
 340           "     struct utimbuf times = { 0 };\n"
 341           "     return utime(filename, &times);\n"
 342           "}" },
 343         { "HAVE_WARN_UNUSED_RESULT", DEFINES_FUNC, NULL, NULL,
 344           "#include <sys/types.h>\n"
 345           "#include <utime.h>\n"
 346           "static __attribute__((warn_unused_result)) int func(int i) {\n"
 347           "     return i + 1;\n"
 348           "}" },
 349         { "HAVE_OPENMP", INSIDE_MAIN, NULL, NULL,
 350           "int i;\n"
 351           "#pragma omp parallel for\n"
 352           "for(i = 0; i < 0; i++) {};\n"
 353           "return 0;\n",
 354           "-Werror -fopenmp" },
 355         { "HAVE_VALGRIND_MEMCHECK_H", OUTSIDE_MAIN, NULL, NULL,
 356           "#include <valgrind/memcheck.h>\n" },
 357         { "HAVE_UCONTEXT", DEFINES_EVERYTHING|EXECUTE|MAY_NOT_COMPILE,
 358           NULL, NULL,
 359           "#include <ucontext.h>\n"
 360           "static int x = 0;\n"
 361           "static char stack[2048];\n"
 362           "static ucontext_t a, b;\n"
 363           "static void fn(void) {\n"
 364           "     x |= 2;\n"
 365           "     setcontext(&b);\n"
 366           "     x |= 4;\n"
 367           "}\n"
 368           "int main(void) {\n"
 369           "     x |= 1;\n"
 370           "     getcontext(&a);\n"
 371           "     a.uc_stack.ss_sp = stack;\n"
 372           "     a.uc_stack.ss_size = sizeof(stack);\n"
 373           "     makecontext(&a, fn, 0);\n"
 374           "     swapcontext(&b, &a);\n"
 375           "     return (x == 3) ? 0 : 1;\n"
 376           "}\n"
 377         },
 378         { "HAVE_POINTER_SAFE_MAKECONTEXT", DEFINES_EVERYTHING|EXECUTE|MAY_NOT_COMPILE,
 379           "HAVE_UCONTEXT", NULL,
 380           "#include <stddef.h>\n"
 381           "#include <ucontext.h>\n"
 382           "static int worked = 0;\n"
 383           "static char stack[1024];\n"
 384           "static ucontext_t a, b;\n"
 385           "static void fn(void *p, void *q) {\n"
 386           "     void *cp = &worked;\n"
 387           "     void *cq = (void *)(~((ptrdiff_t)cp));\n"
 388           "     if ((p == cp) && (q == cq))\n"
 389           "             worked = 1;\n"
 390           "     setcontext(&b);\n"
 391           "}\n"
 392           "int main(void) {\n"
 393           "     void *ap = &worked;\n"
 394           "     void *aq = (void *)(~((ptrdiff_t)ap));\n"
 395           "     getcontext(&a);\n"
 396           "     a.uc_stack.ss_sp = stack;\n"
 397           "     a.uc_stack.ss_size = sizeof(stack);\n"
 398           "     makecontext(&a, (void (*)(void))fn, 2, ap, aq);\n"
 399           "     swapcontext(&b, &a);\n"
 400           "     return worked ? 0 : 1;\n"
 401           "}\n"
 402         },
 403 };
 404
 405 static void c12r_err(int eval, const char *fmt, ...)
 406 {
 407         int err_errno = errno;
 408         va_list ap;
 409
 410         fprintf(stderr, "%s: ", progname);
 411         va_start(ap, fmt);
 412         vfprintf(stderr, fmt, ap);
 413         va_end(ap);
 414         fprintf(stderr, ": %s\n", strerror(err_errno));
 415         exit(eval);
 416 }
 417
 418 static void c12r_errx(int eval, const char *fmt, ...)
 419 {
 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, "\n");
 427         exit(eval);
 428 }
 429
 430 static size_t fcopy(FILE *fsrc, FILE *fdst)
 431 {
 432         char buffer[BUFSIZ];
 433         size_t rsize, wsize;
 434         size_t copied = 0;
 435
 436         while ((rsize = fread(buffer, 1, BUFSIZ, fsrc)) > 0) {
 437                 wsize = fwrite(buffer, 1, rsize, fdst);
 438                 copied += wsize;
 439                 if (wsize != rsize)
 440                         break;
 441         }
 442
 443         return copied;
 444 }
 445
 446 static char *grab_stream(FILE *file)
 447 {
 448         size_t max, ret, size = 0;
 449         char *buffer;
 450
 451         max = BUFSIZ;
 452         buffer = malloc(max);
 453         while ((ret = fread(buffer+size, 1, max - size, file)) == max - size) {
 454                 size += ret;
 455                 buffer = realloc(buffer, max *= 2);
 456         }
 457         size += ret;
 458         if (ferror(file))
 459                 c12r_err(1, "reading from command");
 460         buffer[size] = '\0';
 461         return buffer;
 462 }
 463
 464 static char *run(const char *cmd, int *exitstatus)
 465 {
 466         static const char redir[] = " 2>&1";
 467         size_t cmdlen;
 468         char *cmdredir;
 469         FILE *cmdout;
 470         char *ret;
 471
 472         cmdlen = strlen(cmd);
 473         cmdredir = malloc(cmdlen + sizeof(redir));
 474         memcpy(cmdredir, cmd, cmdlen);
 475         memcpy(cmdredir + cmdlen, redir, sizeof(redir));
 476
 477         cmdout = popen(cmdredir, "r");
 478         if (!cmdout)
 479                 c12r_err(1, "popen \"%s\"", cmdredir);
 480
 481         free(cmdredir);
 482
 483         ret = grab_stream(cmdout);
 484         *exitstatus = pclose(cmdout);
 485         return ret;
 486 }
 487
 488 static char *connect_args(const char *argv[], const char *outflag,
 489                 const char *files)
 490 {
 491         unsigned int i;
 492         char *ret;
 493         size_t len = strlen(outflag) + strlen(files) + 1;
 494
 495         for (i = 1; argv[i]; i++)
 496                 len += 1 + strlen(argv[i]);
 497
 498         ret = malloc(len);
 499         len = 0;
 500         for (i = 1; argv[i]; i++) {
 501                 strcpy(ret + len, argv[i]);
 502                 len += strlen(argv[i]);
 503                 if (argv[i+1] || *outflag)
 504                         ret[len++] = ' ';
 505         }
 506         strcpy(ret + len, outflag);
 507         len += strlen(outflag);
 508         strcpy(ret + len, files);
 509         return ret;
 510 }
 511
 512 static struct test *find_test(const char *name)
 513 {
 514         unsigned int i;
 515
 516         for (i = 0; i < sizeof(tests)/sizeof(tests[0]); i++) {
 517                 if (strcmp(tests[i].name, name) == 0)
 518                         return &tests[i];
 519         }
 520         abort();
 521 }
 522
 523 #define PRE_BOILERPLATE "/* Test program generated by configurator. */\n"
 524 #define MAIN_START_BOILERPLATE \
 525         "int main(int argc, char *argv[]) {\n" \
 526         "       (void)argc;\n" \
 527         "       (void)argv;\n"
 528 #define USE_FUNC_BOILERPLATE "(void)func;\n"
 529 #define MAIN_BODY_BOILERPLATE "return 0;\n"
 530 #define MAIN_END_BOILERPLATE "}\n"
 531
 532 static bool run_test(const char *cmd, struct test *test)
 533 {
 534         char *output, *newcmd;
 535         FILE *outf;
 536         int status;
 537
 538         if (test->done)
 539                 return test->answer;
 540
 541         if (test->depends) {
 542                 size_t len;
 543                 const char *deps = test->depends;
 544                 char *dep;
 545
 546                 /* Space-separated dependencies, could be ! for inverse. */
 547                 while ((len = strcspn(deps, " ")) != 0) {
 548                         bool positive = true;
 549                         if (deps[len]) {
 550                                 dep = strdup(deps);
 551                                 dep[len] = '\0';
 552                         } else {
 553                                 dep = (char *)deps;
 554                         }
 555
 556                         if (dep[0] == '!') {
 557                                 dep++;
 558                                 positive = false;
 559                         }
 560                         if (run_test(cmd, find_test(dep)) != positive) {
 561                                 test->answer = false;
 562                                 test->done = true;
 563                                 return test->answer;
 564                         }
 565                         if (deps[len])
 566                                 free(dep);
 567
 568                         deps += len;
 569                         deps += strspn(deps, " ");
 570                 }
 571         }
 572
 573         outf = fopen(INPUT_FILE, verbose > 1 ? "w+" : "w");
 574         if (!outf)
 575                 c12r_err(1, "creating %s", INPUT_FILE);
 576
 577         fprintf(outf, "%s", PRE_BOILERPLATE);
 578         switch (test->style & ~(EXECUTE|MAY_NOT_COMPILE)) {
 579         case INSIDE_MAIN:
 580                 fprintf(outf, "%s", MAIN_START_BOILERPLATE);
 581                 fprintf(outf, "%s", test->fragment);
 582                 fprintf(outf, "%s", MAIN_END_BOILERPLATE);
 583                 break;
 584         case OUTSIDE_MAIN:
 585                 fprintf(outf, "%s", test->fragment);
 586                 fprintf(outf, "%s", MAIN_START_BOILERPLATE);
 587                 fprintf(outf, "%s", MAIN_BODY_BOILERPLATE);
 588                 fprintf(outf, "%s", MAIN_END_BOILERPLATE);
 589                 break;
 590         case DEFINES_FUNC:
 591                 fprintf(outf, "%s", test->fragment);
 592                 fprintf(outf, "%s", MAIN_START_BOILERPLATE);
 593                 fprintf(outf, "%s", USE_FUNC_BOILERPLATE);
 594                 fprintf(outf, "%s", MAIN_BODY_BOILERPLATE);
 595                 fprintf(outf, "%s", MAIN_END_BOILERPLATE);
 596                 break;
 597         case DEFINES_EVERYTHING:
 598                 fprintf(outf, "%s", test->fragment);
 599                 break;
 600         default:
 601                 abort();
 602
 603         }
 604
 605         if (verbose > 1) {
 606                 fseek(outf, 0, SEEK_SET);
 607                 fcopy(outf, stdout);
 608         }
 609
 610         fclose(outf);
 611
 612         newcmd = strdup(cmd);
 613
 614         if (test->flags) {
 615                 newcmd = realloc(newcmd, strlen(newcmd) + strlen(" ")
 616                                 + strlen(test->flags) + 1);
 617                 strcat(newcmd, " ");
 618                 strcat(newcmd, test->flags);
 619                 if (verbose > 1)
 620                         printf("Extra flags line: %s", newcmd);
 621         }
 622
 623         if (test->link) {
 624                 newcmd = realloc(newcmd, strlen(newcmd) + strlen(" ")
 625                                 + strlen(test->link) + 1);
 626                 strcat(newcmd, " ");
 627                 strcat(newcmd, test->link);
 628                 if (verbose > 1)
 629                         printf("Extra link line: %s", newcmd);
 630         }
 631
 632         output = run(newcmd, &status);
 633
 634         free(newcmd);
 635
 636         if (status != 0 || strstr(output, "warning")) {
 637                 if (verbose)
 638                         printf("Compile %s for %s, status %i: %s\n",
 639                                status ? "fail" : "warning",
 640                                test->name, status, output);
 641                 if ((test->style & EXECUTE) && !(test->style & MAY_NOT_COMPILE))
 642                         c12r_errx(1, "Test for %s did not compile:\n%s",
 643                                   test->name, output);
 644                 test->answer = false;
 645                 free(output);
 646         } else {
 647                 /* Compile succeeded. */
 648                 free(output);
 649                 /* We run INSIDE_MAIN tests for sanity checking. */
 650                 if ((test->style & EXECUTE) || (test->style & INSIDE_MAIN)) {
 651                         output = run("." DIR_SEP OUTPUT_FILE, &status);
 652                         if (!(test->style & EXECUTE) && status != 0)
 653                                 c12r_errx(1, "Test for %s failed with %i:\n%s",
 654                                           test->name, status, output);
 655                         if (verbose && status)
 656                                 printf("%s exited %i\n", test->name, status);
 657                         free(output);
 658                 }
 659                 test->answer = (status == 0);
 660         }
 661         test->done = true;
 662
 663         if (test->answer && test->overrides) {
 664                 struct test *override = find_test(test->overrides);
 665                 override->done = true;
 666                 override->answer = true;
 667         }
 668         return test->answer;
 669 }
 670
 671 int main(int argc, const char *argv[])
 672 {
 673         char *cmd;
 674         unsigned int i;
 675         const char *default_args[]
 676                 = { "", DEFAULT_COMPILER, DEFAULT_FLAGS, NULL };
 677         const char *outflag = DEFAULT_OUTPUT_EXE_FLAG;
 678         const char *configurator_cc = NULL;
 679         const char *orig_cc;
 680
 681         if (argc > 0)
 682                 progname = argv[0];
 683
 684         while (argc > 1) {
 685                 if (strcmp(argv[1], "--help") == 0) {
 686                         printf("Usage: configurator [-v] [-O<outflag>] [--configurator-cc=<compiler-for-tests>] [<compiler> <flags>...]\n"
 687                                "  <compiler> <flags> will have \"<outflag> <outfile> <infile.c>\" appended\n"
 688                                "Default: %s %s %s\n",
 689                                DEFAULT_COMPILER, DEFAULT_FLAGS,
 690                                DEFAULT_OUTPUT_EXE_FLAG);
 691                         exit(0);
 692                 }
 693                 if (strncmp(argv[1], "-O", 2) == 0) {
 694                         argc--;
 695                         argv++;
 696                         outflag = argv[1] + 2;
 697                         if (!*outflag) {
 698                                 fprintf(stderr,
 699                                         "%s: option requires an argument -- O\n",
 700                                         argv[0]);
 701                                 exit(1);
 702                         }
 703                 } else if (strcmp(argv[1], "-v") == 0) {
 704                         argc--;
 705                         argv++;
 706                         verbose++;
 707                 } else if (strcmp(argv[1], "-vv") == 0) {
 708                         argc--;
 709                         argv++;
 710                         verbose += 2;
 711                 } else if (strncmp(argv[1], "--configurator-cc=", 18) == 0) {
 712                         configurator_cc = argv[1] + 18;
 713                         argc--;
 714                         argv++;
 715                 } else {
 716                         break;
 717                 }
 718         }
 719
 720         if (argc == 1)
 721                 argv = default_args;
 722
 723         orig_cc = argv[1];
 724         if (configurator_cc)
 725                 argv[1] = configurator_cc;
 726
 727         cmd = connect_args(argv, outflag, OUTPUT_FILE " " INPUT_FILE);
 728         for (i = 0; i < sizeof(tests)/sizeof(tests[0]); i++)
 729                 run_test(cmd, &tests[i]);
 730         free(cmd);
 731
 732         remove(OUTPUT_FILE);
 733         remove(INPUT_FILE);
 734
 735         printf("/* Generated by CCAN configurator */\n"
 736                "#ifndef CCAN_CONFIG_H\n"
 737                "#define CCAN_CONFIG_H\n");
 738         printf("#ifndef _GNU_SOURCE\n");
 739         printf("#define _GNU_SOURCE /* Always use GNU extensions. */\n");
 740         printf("#endif\n");
 741         printf("#define CCAN_COMPILER \"%s\"\n", orig_cc);
 742         cmd = connect_args(argv + 1, "", "");
 743         printf("#define CCAN_CFLAGS \"%s\"\n", cmd);
 744         free(cmd);
 745         printf("#define CCAN_OUTPUT_EXE_CFLAG \"%s\"\n\n", outflag);
 746         /* This one implies "#include <ccan/..." works, eg. for tdb2.h */
 747         printf("#define HAVE_CCAN 1\n");
 748         for (i = 0; i < sizeof(tests)/sizeof(tests[0]); i++)
 749                 printf("#define %s %u\n", tests[i].name, tests[i].answer);
 750         printf("#endif /* CCAN_CONFIG_H */\n");
 751         return 0;
 752 }