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 #define EXIT_BAD_USAGE            1
  30 #define EXIT_TROUBLE_RUNNING      2
  31 #define EXIT_BAD_TEST             3
  32 #define EXIT_BAD_INPUT            4
  33
  34 #include <errno.h>
  35 #include <stdio.h>
  36 #include <stdarg.h>
  37 #include <stdbool.h>
  38 #include <stdlib.h>
  39 #include <string.h>
  40 #include <unistd.h>
  41
  42 #ifdef _MSC_VER
  43 #define popen _popen
  44 #define pclose _pclose
  45 #endif
  46
  47 #ifdef _MSC_VER
  48 #define DEFAULT_COMPILER "cl"
  49 /* Note:  Dash options avoid POSIX path conversion when used under msys bash
  50  *        and are therefore preferred to slash (e.g. -nologo over /nologo)
  51  * Note:  Disable Warning 4200 "nonstandard extension used : zero-sized array
  52  *        in struct/union" for flexible array members.
  53  */
  54 #define DEFAULT_FLAGS "-nologo -Zi -W4 -wd4200 " \
  55         "-D_CRT_NONSTDC_NO_WARNINGS -D_CRT_SECURE_NO_WARNINGS"
  56 #define DEFAULT_OUTPUT_EXE_FLAG "-Fe:"
  57 #else
  58 #define DEFAULT_COMPILER "cc"
  59 #define DEFAULT_FLAGS "-g3 -ggdb -Wall -Wundef -Wmissing-prototypes -Wmissing-declarations -Wstrict-prototypes -Wold-style-definition"
  60 #define DEFAULT_OUTPUT_EXE_FLAG "-o"
  61 #endif
  62
  63 #define OUTPUT_FILE "configurator.out"
  64 #define INPUT_FILE "configuratortest.c"
  65
  66 #ifdef _WIN32
  67 #define DIR_SEP   "\\"
  68 #else
  69 #define DIR_SEP   "/"
  70 #endif
  71
  72 static const char *progname = "";
  73 static int verbose;
  74 static bool like_a_libtool = false;
  75
  76 struct test {
  77         const char *name;
  78         const char *desc;
  79         /*
  80          * Template style flags (pick one):
  81          * OUTSIDE_MAIN:
  82          * - put a simple boilerplate main below it.
  83          * DEFINES_FUNC:
  84          * - defines a static function called func; adds ref to avoid warnings
  85          * INSIDE_MAIN:
  86          * - put this inside main().
  87          * DEFINES_EVERYTHING:
  88          * - don't add any boilerplate at all.
  89          *
  90          * Execution flags:
  91          * EXECUTE:
  92          * - a runtime test; must compile, exit 0 means flag is set.
  93          * MAY_NOT_COMPILE:
  94          * - Only useful with EXECUTE: don't get upset if it doesn't compile.
  95          * <nothing>:
  96          * - a compile test, if it compiles must run and exit 0.
  97          */
  98         const char *style;
  99         const char *depends;
 100         const char *link;
 101         const char *fragment;
 102         const char *flags;
 103         const char *overrides; /* On success, force this to '1' */
 104         bool done;
 105         bool answer;
 106 };
 107
 108 /* Terminated by a NULL name */
 109 static struct test *tests;
 110
 111 static const struct test base_tests[] = {
 112         { "HAVE_32BIT_OFF_T", "off_t is 32 bits",
 113           "DEFINES_EVERYTHING|EXECUTE|MAY_NOT_COMPILE", NULL, NULL,
 114           "#include <sys/types.h>\n"
 115           "int main(void) {\n"
 116           "     return sizeof(off_t) == 4 ? 0 : 1;\n"
 117           "}\n" },
 118         { "HAVE_ALIGNOF", "__alignof__ support",
 119           "INSIDE_MAIN", NULL, NULL,
 120           "return __alignof__(double) > 0 ? 0 : 1;" },
 121         { "HAVE_ASPRINTF", "asprintf() declaration",
 122           "DEFINES_FUNC", NULL, NULL,
 123           "#ifndef _GNU_SOURCE\n"
 124           "#define _GNU_SOURCE\n"
 125           "#endif\n"
 126           "#include <stdio.h>\n"
 127           "static char *func(int x) {"
 128           "     char *p;\n"
 129           "     if (asprintf(&p, \"%u\", x) == -1) \n"
 130           "             p = NULL;\n"
 131           "     return p;\n"
 132           "}" },
 133         { "HAVE_ATTRIBUTE_COLD", "__attribute__((cold)) support",
 134           "DEFINES_FUNC", NULL, NULL,
 135           "static int __attribute__((cold)) func(int x) { return x; }" },
 136         { "HAVE_ATTRIBUTE_CONST", "__attribute__((const)) support",
 137           "DEFINES_FUNC", NULL, NULL,
 138           "static int __attribute__((const)) func(int x) { return x; }" },
 139         { "HAVE_ATTRIBUTE_DEPRECATED", "__attribute__((deprecated)) support",
 140           "DEFINES_FUNC", NULL, NULL,
 141           "static int __attribute__((deprecated)) func(int x) { return x; }" },
 142         { "HAVE_ATTRIBUTE_NONNULL", "__attribute__((nonnull)) support",
 143           "DEFINES_FUNC", NULL, NULL,
 144           "static char *__attribute__((nonnull)) func(char *p) { return p; }" },
 145         { "HAVE_ATTRIBUTE_RETURNS_NONNULL", "__attribute__((returns_nonnull)) support",
 146           "DEFINES_FUNC", NULL, NULL,
 147           "static const char *__attribute__((returns_nonnull)) func(void) { return \"hi\"; }" },
 148         { "HAVE_ATTRIBUTE_SENTINEL", "__attribute__((sentinel)) support",
 149           "DEFINES_FUNC", NULL, NULL,
 150           "static int __attribute__((sentinel)) func(int i, ...) { return i; }" },
 151         { "HAVE_ATTRIBUTE_PURE", "__attribute__((pure)) support",
 152           "DEFINES_FUNC", NULL, NULL,
 153           "static int __attribute__((pure)) func(int x) { return x; }" },
 154         { "HAVE_ATTRIBUTE_MAY_ALIAS", "__attribute__((may_alias)) support",
 155           "OUTSIDE_MAIN", NULL, NULL,
 156           "typedef short __attribute__((__may_alias__)) short_a;" },
 157         { "HAVE_ATTRIBUTE_NORETURN", "__attribute__((noreturn)) support",
 158           "DEFINES_FUNC", NULL, NULL,
 159           "#include <stdlib.h>\n"
 160           "static void __attribute__((noreturn)) func(int x) { exit(x); }" },
 161         { "HAVE_ATTRIBUTE_PRINTF", "__attribute__ format printf support",
 162           "DEFINES_FUNC", NULL, NULL,
 163           "static void __attribute__((format(__printf__, 1, 2))) func(const char *fmt, ...) { (void)fmt; }" },
 164         { "HAVE_ATTRIBUTE_UNUSED", "__attribute__((unused)) support",
 165           "OUTSIDE_MAIN", NULL, NULL,
 166           "static int __attribute__((unused)) func(int x) { return x; }" },
 167         { "HAVE_ATTRIBUTE_USED", "__attribute__((used)) support",
 168           "OUTSIDE_MAIN", NULL, NULL,
 169           "static int __attribute__((used)) func(int x) { return x; }" },
 170         { "HAVE_BACKTRACE", "backtrace() in <execinfo.h>",
 171           "DEFINES_FUNC", NULL, NULL,
 172           "#include <execinfo.h>\n"
 173           "static int func(int x) {"
 174           "     void *bt[10];\n"
 175           "     return backtrace(bt, 10) < x;\n"
 176           "}" },
 177         { "HAVE_BIG_ENDIAN", "big endian",
 178           "INSIDE_MAIN|EXECUTE", NULL, NULL,
 179           "union { int i; char c[sizeof(int)]; } u;\n"
 180           "u.i = 0x01020304;\n"
 181           "return u.c[0] == 0x01 && u.c[1] == 0x02 && u.c[2] == 0x03 && u.c[3] == 0x04 ? 0 : 1;" },
 182         { "HAVE_BSWAP_64", "bswap64 in byteswap.h",
 183           "DEFINES_FUNC", "HAVE_BYTESWAP_H", NULL,
 184           "#include <byteswap.h>\n"
 185           "static int func(int x) { return bswap_64(x); }" },
 186         { "HAVE_BUILTIN_CHOOSE_EXPR", "__builtin_choose_expr support",
 187           "INSIDE_MAIN", NULL, NULL,
 188           "return __builtin_choose_expr(1, 0, \"garbage\");" },
 189         { "HAVE_BUILTIN_CLZ", "__builtin_clz support",
 190           "INSIDE_MAIN", NULL, NULL,
 191           "return __builtin_clz(1) == (sizeof(int)*8 - 1) ? 0 : 1;" },
 192         { "HAVE_BUILTIN_CLZL", "__builtin_clzl support",
 193           "INSIDE_MAIN", NULL, NULL,
 194           "return __builtin_clzl(1) == (sizeof(long)*8 - 1) ? 0 : 1;" },
 195         { "HAVE_BUILTIN_CLZLL", "__builtin_clzll support",
 196           "INSIDE_MAIN", NULL, NULL,
 197           "return __builtin_clzll(1) == (sizeof(long long)*8 - 1) ? 0 : 1;" },
 198         { "HAVE_BUILTIN_CTZ", "__builtin_ctz support",
 199           "INSIDE_MAIN", NULL, NULL,
 200           "return __builtin_ctz(1 << (sizeof(int)*8 - 1)) == (sizeof(int)*8 - 1) ? 0 : 1;" },
 201         { "HAVE_BUILTIN_CTZL", "__builtin_ctzl support",
 202           "INSIDE_MAIN", NULL, NULL,
 203           "return __builtin_ctzl(1UL << (sizeof(long)*8 - 1)) == (sizeof(long)*8 - 1) ? 0 : 1;" },
 204         { "HAVE_BUILTIN_CTZLL", "__builtin_ctzll support",
 205           "INSIDE_MAIN", NULL, NULL,
 206           "return __builtin_ctzll(1ULL << (sizeof(long long)*8 - 1)) == (sizeof(long long)*8 - 1) ? 0 : 1;" },
 207         { "HAVE_BUILTIN_CONSTANT_P", "__builtin_constant_p support",
 208           "INSIDE_MAIN", NULL, NULL,
 209           "return __builtin_constant_p(1) ? 0 : 1;" },
 210         { "HAVE_BUILTIN_EXPECT", "__builtin_expect support",
 211           "INSIDE_MAIN", NULL, NULL,
 212           "return __builtin_expect(argc == 1, 1) ? 0 : 1;" },
 213         { "HAVE_BUILTIN_FFS", "__builtin_ffs support",
 214           "INSIDE_MAIN", NULL, NULL,
 215           "return __builtin_ffs(0) == 0 ? 0 : 1;" },
 216         { "HAVE_BUILTIN_FFSL", "__builtin_ffsl support",
 217           "INSIDE_MAIN", NULL, NULL,
 218           "return __builtin_ffsl(0L) == 0 ? 0 : 1;" },
 219         { "HAVE_BUILTIN_FFSLL", "__builtin_ffsll support",
 220           "INSIDE_MAIN", NULL, NULL,
 221           "return __builtin_ffsll(0LL) == 0 ? 0 : 1;" },
 222         { "HAVE_BUILTIN_POPCOUNT", "__builtin_popcount support",
 223           "INSIDE_MAIN", NULL, NULL,
 224           "return __builtin_popcount(255) == 8 ? 0 : 1;" },
 225         { "HAVE_BUILTIN_POPCOUNTL",  "__builtin_popcountl support",
 226           "INSIDE_MAIN", NULL, NULL,
 227           "return __builtin_popcountl(255L) == 8 ? 0 : 1;" },
 228         { "HAVE_BUILTIN_POPCOUNTLL", "__builtin_popcountll support",
 229           "INSIDE_MAIN", NULL, NULL,
 230           "return __builtin_popcountll(255LL) == 8 ? 0 : 1;" },
 231         { "HAVE_BUILTIN_TYPES_COMPATIBLE_P", "__builtin_types_compatible_p support",
 232           "INSIDE_MAIN", NULL, NULL,
 233           "return __builtin_types_compatible_p(char *, int) ? 1 : 0;" },
 234         { "HAVE_ICCARM_INTRINSICS", "<intrinsics.h>",
 235           "DEFINES_FUNC", NULL, NULL,
 236           "#include <intrinsics.h>\n"
 237           "int func(int v) {\n"
 238           "     return __CLZ(__RBIT(v));\n"
 239           "}" },
 240         { "HAVE_BYTESWAP_H", "<byteswap.h>",
 241           "OUTSIDE_MAIN", NULL, NULL,
 242           "#include <byteswap.h>\n" },
 243         { "HAVE_CLOCK_GETTIME", "clock_gettime() declaration",
 244           "DEFINES_FUNC", "HAVE_STRUCT_TIMESPEC", NULL,
 245           "#include <time.h>\n"
 246           "static struct timespec func(void) {\n"
 247           "     struct timespec ts;\n"
 248           "     clock_gettime(CLOCK_REALTIME, &ts);\n"
 249           "     return ts;\n"
 250           "}\n" },
 251         { "HAVE_CLOCK_GETTIME_IN_LIBRT", "clock_gettime() in librt",
 252           "DEFINES_FUNC",
 253           "HAVE_STRUCT_TIMESPEC !HAVE_CLOCK_GETTIME",
 254           "-lrt",
 255           "#include <time.h>\n"
 256           "static struct timespec func(void) {\n"
 257           "     struct timespec ts;\n"
 258           "     clock_gettime(CLOCK_REALTIME, &ts);\n"
 259           "     return ts;\n"
 260           "}\n",
 261           /* This means HAVE_CLOCK_GETTIME, too */
 262           "HAVE_CLOCK_GETTIME" },
 263         { "HAVE_COMPOUND_LITERALS", "compound literal support",
 264           "INSIDE_MAIN", NULL, NULL,
 265           "int *foo = (int[]) { 1, 2, 3, 4 };\n"
 266           "return foo[0] ? 0 : 1;" },
 267         { "HAVE_FCHDIR", "fchdir support",
 268           "DEFINES_EVERYTHING|EXECUTE|MAY_NOT_COMPILE", NULL, NULL,
 269           "#include <sys/types.h>\n"
 270           "#include <sys/stat.h>\n"
 271           "#include <fcntl.h>\n"
 272           "#include <unistd.h>\n"
 273           "int main(void) {\n"
 274           "     int fd = open(\"..\", O_RDONLY);\n"
 275           "     return fchdir(fd) == 0 ? 0 : 1;\n"
 276           "}\n" },
 277         { "HAVE_ERR_H", "<err.h>",
 278           "DEFINES_FUNC", NULL, NULL,
 279           "#include <err.h>\n"
 280           "static void func(int arg) {\n"
 281           "     if (arg == 0)\n"
 282           "             err(1, \"err %u\", arg);\n"
 283           "     if (arg == 1)\n"
 284           "             errx(1, \"err %u\", arg);\n"
 285           "     if (arg == 3)\n"
 286           "             warn(\"warn %u\", arg);\n"
 287           "     if (arg == 4)\n"
 288           "             warnx(\"warn %u\", arg);\n"
 289           "}\n" },
 290         { "HAVE_FILE_OFFSET_BITS", "_FILE_OFFSET_BITS to get 64-bit offsets",
 291           "DEFINES_EVERYTHING|EXECUTE|MAY_NOT_COMPILE",
 292           "HAVE_32BIT_OFF_T", NULL,
 293           "#define _FILE_OFFSET_BITS 64\n"
 294           "#include <sys/types.h>\n"
 295           "int main(void) {\n"
 296           "     return sizeof(off_t) == 8 ? 0 : 1;\n"
 297           "}\n" },
 298         { "HAVE_FOR_LOOP_DECLARATION", "for loop declaration support",
 299           "INSIDE_MAIN", NULL, NULL,
 300           "int ret = 1;\n"
 301           "for (int i = 0; i < argc; i++) { ret = 0; };\n"
 302           "return ret;" },
 303         { "HAVE_FLEXIBLE_ARRAY_MEMBER", "flexible array member support",
 304           "OUTSIDE_MAIN", NULL, NULL,
 305           "struct foo { unsigned int x; int arr[]; };" },
 306         { "HAVE_GETPAGESIZE", "getpagesize() in <unistd.h>",
 307           "DEFINES_FUNC", NULL, NULL,
 308           "#include <unistd.h>\n"
 309           "static int func(void) { return getpagesize(); }" },
 310         { "HAVE_ISBLANK", "isblank() in <ctype.h>",
 311           "DEFINES_FUNC", NULL, NULL,
 312           "#ifndef _GNU_SOURCE\n"
 313           "#define _GNU_SOURCE\n"
 314           "#endif\n"
 315           "#include <ctype.h>\n"
 316           "static int func(void) { return isblank(' '); }" },
 317         { "HAVE_LITTLE_ENDIAN", "little endian",
 318           "INSIDE_MAIN|EXECUTE", NULL, NULL,
 319           "union { int i; char c[sizeof(int)]; } u;\n"
 320           "u.i = 0x01020304;\n"
 321           "return u.c[0] == 0x04 && u.c[1] == 0x03 && u.c[2] == 0x02 && u.c[3] == 0x01 ? 0 : 1;" },
 322         { "HAVE_MEMMEM", "memmem in <string.h>",
 323           "DEFINES_FUNC", NULL, NULL,
 324           "#ifndef _GNU_SOURCE\n"
 325           "#define _GNU_SOURCE\n"
 326           "#endif\n"
 327           "#include <string.h>\n"
 328           "static void *func(void *h, size_t hl, void *n, size_t nl) {\n"
 329           "return memmem(h, hl, n, nl);"
 330           "}\n", },
 331         { "HAVE_MEMRCHR", "memrchr in <string.h>",
 332           "DEFINES_FUNC", NULL, NULL,
 333           "#ifndef _GNU_SOURCE\n"
 334           "#define _GNU_SOURCE\n"
 335           "#endif\n"
 336           "#include <string.h>\n"
 337           "static void *func(void *s, int c, size_t n) {\n"
 338           "return memrchr(s, c, n);"
 339           "}\n", },
 340         { "HAVE_MMAP", "mmap() declaration",
 341           "DEFINES_FUNC", NULL, NULL,
 342           "#include <sys/mman.h>\n"
 343           "static void *func(int fd) {\n"
 344           "     return mmap(0, 65536, PROT_READ, MAP_SHARED, fd, 0);\n"
 345           "}" },
 346         { "HAVE_PROC_SELF_MAPS", "/proc/self/maps exists",
 347           "DEFINES_EVERYTHING|EXECUTE|MAY_NOT_COMPILE", NULL, NULL,
 348           "#include <sys/types.h>\n"
 349           "#include <sys/stat.h>\n"
 350           "#include <fcntl.h>\n"
 351           "int main(void) {\n"
 352           "     return open(\"/proc/self/maps\", O_RDONLY) != -1 ? 0 : 1;\n"
 353           "}\n" },
 354         { "HAVE_QSORT_R_PRIVATE_LAST", "qsort_r cmp takes trailing arg",
 355           "DEFINES_EVERYTHING|EXECUTE|MAY_NOT_COMPILE", NULL, NULL,
 356           "#ifndef _GNU_SOURCE\n"
 357           "#define _GNU_SOURCE\n"
 358           "#endif\n"
 359           "#include <stdlib.h>\n"
 360           "static int cmp(const void *lp, const void *rp, void *priv) {\n"
 361           " *(unsigned int *)priv = 1;\n"
 362           " return *(const int *)lp - *(const int *)rp; }\n"
 363           "int main(void) {\n"
 364           " int array[] = { 9, 2, 5 };\n"
 365           " unsigned int called = 0;\n"
 366           " qsort_r(array, 3, sizeof(int), cmp, &called);\n"
 367           " return called && array[0] == 2 && array[1] == 5 && array[2] == 9 ? 0 : 1;\n"
 368           "}\n" },
 369         { "HAVE_STRUCT_TIMESPEC", "struct timespec declaration",
 370           "DEFINES_FUNC", NULL, NULL,
 371           "#include <time.h>\n"
 372           "static void func(void) {\n"
 373           "     struct timespec ts;\n"
 374           "     ts.tv_sec = ts.tv_nsec = 1;\n"
 375           "}\n" },
 376         { "HAVE_SECTION_START_STOP", "__attribute__((section)) and __start/__stop",
 377           "DEFINES_FUNC", NULL, NULL,
 378           "static void *__attribute__((__section__(\"mysec\"))) p = &p;\n"
 379           "static int func(void) {\n"
 380           "     extern void *__start_mysec[], *__stop_mysec[];\n"
 381           "     return __stop_mysec - __start_mysec;\n"
 382           "}\n" },
 383         { "HAVE_STACK_GROWS_UPWARDS", "stack grows upwards",
 384           "DEFINES_EVERYTHING|EXECUTE", NULL, NULL,
 385           "#include <stddef.h>\n"
 386           "static ptrdiff_t nest(const void *base, unsigned int i)\n"
 387           "{\n"
 388           "     if (i == 0)\n"
 389           "             return (const char *)&i - (const char *)base;\n"
 390           "     return nest(base, i-1);\n"
 391           "}\n"
 392           "int main(int argc, char *argv[]) {\n"
 393           "     (void)argv;\n"
 394           "     return (nest(&argc, argc) > 0) ? 0 : 1;\n"
 395           "}\n" },
 396         { "HAVE_STATEMENT_EXPR", "statement expression support",
 397           "INSIDE_MAIN", NULL, NULL,
 398           "return ({ int x = argc; x == argc ? 0 : 1; });" },
 399         { "HAVE_SYS_FILIO_H", "<sys/filio.h>",
 400           "OUTSIDE_MAIN", NULL, NULL, /* Solaris needs this for FIONREAD */
 401           "#include <sys/filio.h>\n" },
 402         { "HAVE_SYS_TERMIOS_H", "<sys/termios.h>",
 403           "OUTSIDE_MAIN", NULL, NULL,
 404           "#include <sys/termios.h>\n" },
 405         { "HAVE_SYS_UNISTD_H", "<sys/unistd.h>",
 406           "OUTSIDE_MAIN", NULL, NULL,
 407           "#include <sys/unistd.h>\n" },
 408         { "HAVE_TYPEOF", "__typeof__ support",
 409           "INSIDE_MAIN", NULL, NULL,
 410           "__typeof__(argc) i; i = argc; return i == argc ? 0 : 1;" },
 411         { "HAVE_UNALIGNED_ACCESS", "unaligned access to int",
 412           "DEFINES_EVERYTHING|EXECUTE", NULL, NULL,
 413           "#include <string.h>\n"
 414           "int main(int argc, char *argv[]) {\n"
 415           "     (void)argc;\n"
 416           "     char pad[sizeof(int *) * 1];\n"
 417           "     memcpy(pad, argv[0], sizeof(pad));\n"
 418           "     int *x = (int *)pad, *y = (int *)(pad + 1);\n"
 419           "     return *x == *y;\n"
 420           "}\n" },
 421         { "HAVE_UTIME", "utime() declaration",
 422           "DEFINES_FUNC", NULL, NULL,
 423           "#include <sys/types.h>\n"
 424           "#include <utime.h>\n"
 425           "static int func(const char *filename) {\n"
 426           "     struct utimbuf times = { 0 };\n"
 427           "     return utime(filename, &times);\n"
 428           "}" },
 429         { "HAVE_WARN_UNUSED_RESULT", "__attribute__((warn_unused_result))",
 430           "DEFINES_FUNC", NULL, NULL,
 431           "#include <sys/types.h>\n"
 432           "#include <utime.h>\n"
 433           "static __attribute__((warn_unused_result)) int func(int i) {\n"
 434           "     return i + 1;\n"
 435           "}" },
 436         { "HAVE_OPENMP", "#pragma omp and -fopenmp support",
 437           "INSIDE_MAIN|EXECUTE|MAY_NOT_COMPILE", NULL, NULL,
 438           "int i;\n"
 439           "#pragma omp parallel for\n"
 440           "for(i = 0; i < 0; i++) {};\n"
 441           "return 0;\n",
 442           "-Werror -fopenmp" },
 443         { "HAVE_VALGRIND_MEMCHECK_H", "<valgrind/memcheck.h>",
 444           "OUTSIDE_MAIN", NULL, NULL,
 445           "#include <valgrind/memcheck.h>\n" },
 446         { "HAVE_UCONTEXT", "working <ucontext.h",
 447           "DEFINES_EVERYTHING|EXECUTE|MAY_NOT_COMPILE",
 448           NULL, NULL,
 449           "#include <ucontext.h>\n"
 450           "static int x = 0;\n"
 451           "static char stack[2048];\n"
 452           "static ucontext_t a, b;\n"
 453           "static void fn(void) {\n"
 454           "     x |= 2;\n"
 455           "     setcontext(&b);\n"
 456           "     x |= 4;\n"
 457           "}\n"
 458           "int main(void) {\n"
 459           "     x |= 1;\n"
 460           "     getcontext(&a);\n"
 461           "     a.uc_stack.ss_sp = stack;\n"
 462           "     a.uc_stack.ss_size = sizeof(stack);\n"
 463           "     makecontext(&a, fn, 0);\n"
 464           "     swapcontext(&b, &a);\n"
 465           "     return (x == 3) ? 0 : 1;\n"
 466           "}\n"
 467         },
 468         { "HAVE_POINTER_SAFE_MAKECONTEXT", "passing pointers via makecontext()",
 469           "DEFINES_EVERYTHING|EXECUTE|MAY_NOT_COMPILE",
 470           "HAVE_UCONTEXT", NULL,
 471           "#include <stddef.h>\n"
 472           "#include <ucontext.h>\n"
 473           "static int worked = 0;\n"
 474           "static char stack[1024];\n"
 475           "static ucontext_t a, b;\n"
 476           "static void fn(void *p, void *q) {\n"
 477           "     void *cp = &worked;\n"
 478           "     void *cq = (void *)(~((ptrdiff_t)cp));\n"
 479           "     if ((p == cp) && (q == cq))\n"
 480           "             worked = 1;\n"
 481           "     setcontext(&b);\n"
 482           "}\n"
 483           "int main(void) {\n"
 484           "     void *ap = &worked;\n"
 485           "     void *aq = (void *)(~((ptrdiff_t)ap));\n"
 486           "     getcontext(&a);\n"
 487           "     a.uc_stack.ss_sp = stack;\n"
 488           "     a.uc_stack.ss_size = sizeof(stack);\n"
 489           "     makecontext(&a, (void (*)(void))fn, 2, ap, aq);\n"
 490           "     swapcontext(&b, &a);\n"
 491           "     return worked ? 0 : 1;\n"
 492           "}\n"
 493         },
 494         { "HAVE_BUILTIN_CPU_SUPPORTS", "__builtin_cpu_supports()",
 495           "DEFINES_FUNC", NULL, NULL,
 496           "#include <stdbool.h>\n"
 497           "static bool func(void) {\n"
 498           "     return __builtin_cpu_supports(\"mmx\");\n"
 499           "}"
 500         },
 501 };
 502
 503 static void c12r_err(int eval, const char *fmt, ...)
 504 {
 505         int err_errno = errno;
 506         va_list ap;
 507
 508         fprintf(stderr, "%s: ", progname);
 509         va_start(ap, fmt);
 510         vfprintf(stderr, fmt, ap);
 511         va_end(ap);
 512         fprintf(stderr, ": %s\n", strerror(err_errno));
 513         exit(eval);
 514 }
 515
 516 static void c12r_errx(int eval, const char *fmt, ...)
 517 {
 518         va_list ap;
 519
 520         fprintf(stderr, "%s: ", progname);
 521         va_start(ap, fmt);
 522         vfprintf(stderr, fmt, ap);
 523         va_end(ap);
 524         fprintf(stderr, "\n");
 525         exit(eval);
 526 }
 527
 528 static void start_test(const char *what, const char *why)
 529 {
 530         if (like_a_libtool) {
 531                 printf("%s%s... ", what, why);
 532                 fflush(stdout);
 533         }
 534 }
 535
 536 static void end_test(bool result)
 537 {
 538         if (like_a_libtool)
 539                 printf("%s\n", result ? "yes" : "no");
 540 }
 541
 542 static size_t fcopy(FILE *fsrc, FILE *fdst)
 543 {
 544         char buffer[BUFSIZ];
 545         size_t rsize, wsize;
 546         size_t copied = 0;
 547
 548         while ((rsize = fread(buffer, 1, BUFSIZ, fsrc)) > 0) {
 549                 wsize = fwrite(buffer, 1, rsize, fdst);
 550                 copied += wsize;
 551                 if (wsize != rsize)
 552                         break;
 553         }
 554
 555         return copied;
 556 }
 557
 558 static char *grab_stream(FILE *file)
 559 {
 560         size_t max, ret, size = 0;
 561         char *buffer;
 562
 563         max = BUFSIZ;
 564         buffer = malloc(max);
 565         while ((ret = fread(buffer+size, 1, max - size, file)) == max - size) {
 566                 size += ret;
 567                 buffer = realloc(buffer, max *= 2);
 568         }
 569         size += ret;
 570         if (ferror(file))
 571                 c12r_err(EXIT_TROUBLE_RUNNING, "reading from command");
 572         buffer[size] = '\0';
 573         return buffer;
 574 }
 575
 576 static char *run(const char *cmd, int *exitstatus)
 577 {
 578         static const char redir[] = " 2>&1";
 579         size_t cmdlen;
 580         char *cmdredir;
 581         FILE *cmdout;
 582         char *ret;
 583
 584         cmdlen = strlen(cmd);
 585         cmdredir = malloc(cmdlen + sizeof(redir));
 586         memcpy(cmdredir, cmd, cmdlen);
 587         memcpy(cmdredir + cmdlen, redir, sizeof(redir));
 588
 589         cmdout = popen(cmdredir, "r");
 590         if (!cmdout)
 591                 c12r_err(EXIT_TROUBLE_RUNNING, "popen \"%s\"", cmdredir);
 592
 593         free(cmdredir);
 594
 595         ret = grab_stream(cmdout);
 596         *exitstatus = pclose(cmdout);
 597         return ret;
 598 }
 599
 600 static char *connect_args(const char *argv[], const char *outflag,
 601                 const char *files)
 602 {
 603         unsigned int i;
 604         char *ret;
 605         size_t len = strlen(outflag) + strlen(files) + 1;
 606
 607         for (i = 1; argv[i]; i++)
 608                 len += 1 + strlen(argv[i]);
 609
 610         ret = malloc(len);
 611         len = 0;
 612         for (i = 1; argv[i]; i++) {
 613                 strcpy(ret + len, argv[i]);
 614                 len += strlen(argv[i]);
 615                 if (argv[i+1] || *outflag)
 616                         ret[len++] = ' ';
 617         }
 618         strcpy(ret + len, outflag);
 619         len += strlen(outflag);
 620         strcpy(ret + len, files);
 621         return ret;
 622 }
 623
 624 static struct test *find_test(const char *name)
 625 {
 626         unsigned int i;
 627
 628         for (i = 0; tests[i].name; i++) {
 629                 if (strcmp(tests[i].name, name) == 0)
 630                         return &tests[i];
 631         }
 632         c12r_errx(EXIT_BAD_TEST, "Unknown test %s", name);
 633         abort();
 634 }
 635
 636 #define PRE_BOILERPLATE "/* Test program generated by configurator. */\n"
 637 #define MAIN_START_BOILERPLATE \
 638         "int main(int argc, char *argv[]) {\n" \
 639         "       (void)argc;\n" \
 640         "       (void)argv;\n"
 641 #define USE_FUNC_BOILERPLATE "(void)func;\n"
 642 #define MAIN_BODY_BOILERPLATE "return 0;\n"
 643 #define MAIN_END_BOILERPLATE "}\n"
 644
 645 static bool run_test(const char *cmd, const char *wrapper, struct test *test)
 646 {
 647         char *output, *newcmd;
 648         FILE *outf;
 649         int status;
 650
 651         if (test->done)
 652                 return test->answer;
 653
 654         if (test->depends) {
 655                 size_t len;
 656                 const char *deps = test->depends;
 657                 char *dep;
 658
 659                 /* Space-separated dependencies, could be ! for inverse. */
 660                 while ((len = strcspn(deps, " ")) != 0) {
 661                         bool positive = true;
 662                         if (deps[len]) {
 663                                 dep = strdup(deps);
 664                                 dep[len] = '\0';
 665                         } else {
 666                                 dep = (char *)deps;
 667                         }
 668
 669                         if (dep[0] == '!') {
 670                                 dep++;
 671                                 positive = false;
 672                         }
 673                         if (run_test(cmd, wrapper, find_test(dep)) != positive) {
 674                                 test->answer = false;
 675                                 test->done = true;
 676                                 return test->answer;
 677                         }
 678                         if (deps[len])
 679                                 free(dep);
 680
 681                         deps += len;
 682                         deps += strspn(deps, " ");
 683                 }
 684         }
 685
 686         outf = fopen(INPUT_FILE, verbose > 1 ? "w+" : "w");
 687         if (!outf)
 688                 c12r_err(EXIT_TROUBLE_RUNNING, "creating %s", INPUT_FILE);
 689
 690         fprintf(outf, "%s", PRE_BOILERPLATE);
 691
 692         if (strstr(test->style, "INSIDE_MAIN")) {
 693                 fprintf(outf, "%s", MAIN_START_BOILERPLATE);
 694                 fprintf(outf, "%s", test->fragment);
 695                 fprintf(outf, "%s", MAIN_END_BOILERPLATE);
 696         } else if (strstr(test->style, "OUTSIDE_MAIN")) {
 697                 fprintf(outf, "%s", test->fragment);
 698                 fprintf(outf, "%s", MAIN_START_BOILERPLATE);
 699                 fprintf(outf, "%s", MAIN_BODY_BOILERPLATE);
 700                 fprintf(outf, "%s", MAIN_END_BOILERPLATE);
 701         } else if (strstr(test->style, "DEFINES_FUNC")) {
 702                 fprintf(outf, "%s", test->fragment);
 703                 fprintf(outf, "%s", MAIN_START_BOILERPLATE);
 704                 fprintf(outf, "%s", USE_FUNC_BOILERPLATE);
 705                 fprintf(outf, "%s", MAIN_BODY_BOILERPLATE);
 706                 fprintf(outf, "%s", MAIN_END_BOILERPLATE);
 707         } else if (strstr(test->style, "DEFINES_EVERYTHING")) {
 708                 fprintf(outf, "%s", test->fragment);
 709         } else
 710                 c12r_errx(EXIT_BAD_TEST, "Unknown style for test %s: %s",
 711                           test->name, test->style);
 712
 713         if (verbose > 1) {
 714                 fseek(outf, 0, SEEK_SET);
 715                 fcopy(outf, stdout);
 716         }
 717
 718         fclose(outf);
 719
 720         newcmd = strdup(cmd);
 721
 722         if (test->flags) {
 723                 newcmd = realloc(newcmd, strlen(newcmd) + strlen(" ")
 724                                 + strlen(test->flags) + 1);
 725                 strcat(newcmd, " ");
 726                 strcat(newcmd, test->flags);
 727                 if (verbose > 1)
 728                         printf("Extra flags line: %s", newcmd);
 729         }
 730
 731         if (test->link) {
 732                 newcmd = realloc(newcmd, strlen(newcmd) + strlen(" ")
 733                                 + strlen(test->link) + 1);
 734                 strcat(newcmd, " ");
 735                 strcat(newcmd, test->link);
 736                 if (verbose > 1)
 737                         printf("Extra link line: %s", newcmd);
 738         }
 739
 740         start_test("checking for ", test->desc);
 741         output = run(newcmd, &status);
 742
 743         free(newcmd);
 744
 745         if (status != 0 || strstr(output, "warning")) {
 746                 if (verbose)
 747                         printf("Compile %s for %s, status %i: %s\n",
 748                                status ? "fail" : "warning",
 749                                test->name, status, output);
 750                 if (strstr(test->style, "EXECUTE")
 751                     && !strstr(test->style, "MAY_NOT_COMPILE"))
 752                         c12r_errx(EXIT_BAD_TEST,
 753                                   "Test for %s did not compile:\n%s",
 754                                   test->name, output);
 755                 test->answer = false;
 756                 free(output);
 757         } else {
 758                 /* Compile succeeded. */
 759                 free(output);
 760                 /* We run INSIDE_MAIN tests for sanity checking. */
 761                 if (strstr(test->style, "EXECUTE")
 762                     || strstr(test->style, "INSIDE_MAIN")) {
 763                         char *cmd = malloc(strlen(wrapper) + strlen(" ." DIR_SEP OUTPUT_FILE) + 1);
 764
 765                         strcpy(cmd, wrapper);
 766                         strcat(cmd, " ." DIR_SEP OUTPUT_FILE);
 767                         output = run(cmd, &status);
 768                         if (wrapper) {
 769                                 free(cmd);
 770                         }
 771                         if (!strstr(test->style, "EXECUTE") && status != 0)
 772                                 c12r_errx(EXIT_BAD_TEST,
 773                                           "Test for %s failed with %i:\n%s",
 774                                           test->name, status, output);
 775                         if (verbose && status)
 776                                 printf("%s exited %i\n", test->name, status);
 777                         free(output);
 778                 }
 779                 test->answer = (status == 0);
 780         }
 781         test->done = true;
 782         end_test(test->answer);
 783
 784         if (test->answer && test->overrides) {
 785                 struct test *override = find_test(test->overrides);
 786                 override->done = true;
 787                 override->answer = true;
 788         }
 789         return test->answer;
 790 }
 791
 792 static char *any_field(char **fieldname)
 793 {
 794         char buf[1000];
 795         for (;;) {
 796                 char *p, *eq;
 797
 798                 if (!fgets(buf, sizeof(buf), stdin))
 799                         return NULL;
 800
 801                 p = buf;
 802                 /* Ignore whitespace, lines starting with # */
 803                 while (*p == ' ' || *p == '\t')
 804                         p++;
 805                 if (*p == '#' || *p == '\n')
 806                         continue;
 807
 808                 eq = strchr(p, '=');
 809                 if (!eq)
 810                         c12r_errx(EXIT_BAD_INPUT, "no = in line: %s", p);
 811                 *eq = '\0';
 812                 *fieldname = strdup(p);
 813                 p = eq + 1;
 814                 if (strlen(p) && p[strlen(p)-1] == '\n')
 815                         p[strlen(p)-1] = '\0';
 816                 return strdup(p);
 817         }
 818 }
 819
 820 static char *read_field(const char *name, bool compulsory)
 821 {
 822         char *fieldname, *value;
 823
 824         value = any_field(&fieldname);
 825         if (!value) {
 826                 if (!compulsory)
 827                         return NULL;
 828                 c12r_errx(EXIT_BAD_INPUT, "Could not read field %s", name);
 829         }
 830         if (strcmp(fieldname, name) != 0)
 831                 c12r_errx(EXIT_BAD_INPUT,
 832                           "Expected field %s not %s", name, fieldname);
 833         return value;
 834 }
 835
 836 /* Test descriptions from stdin:
 837  * Lines starting with # or whitespace-only are ignored.
 838  *
 839  * First three non-ignored lines must be:
 840  *  var=<varname>
 841  *  desc=<description-for-autotools-style>
 842  *  style=OUTSIDE_MAIN DEFINES_FUNC INSIDE_MAIN DEFINES_EVERYTHING EXECUTE MAY_NOT_COMPILE
 843  *
 844  * Followed by optional lines:
 845  *  depends=<space-separated-testnames, ! to invert>
 846  *  link=<extra args for link line>
 847  *  flags=<extra args for compile line>
 848  *  overrides=<testname-to-force>
 849  *
 850  * Finally a code line, either:
 851  *  code=<oneline> OR
 852  *  code=
 853  *  <lines of code>
 854  *  <end-comment>
 855  *
 856  * And <end-comment> looks like this next comment: */
 857 /*END*/
 858 static bool read_test(struct test *test)
 859 {
 860         char *field, *value;
 861         char buf[1000];
 862
 863         memset(test, 0, sizeof(*test));
 864         test->name = read_field("var", false);
 865         if (!test->name)
 866                 return false;
 867         test->desc = read_field("desc", true);
 868         test->style = read_field("style", true);
 869         /* Read any optional fields. */
 870         while ((value = any_field(&field)) != NULL) {
 871                 if (strcmp(field, "depends") == 0)
 872                         test->depends = value;
 873                 else if (strcmp(field, "link") == 0)
 874                         test->link = value;
 875                 else if (strcmp(field, "flags") == 0)
 876                         test->flags = value;
 877                 else if (strcmp(field, "overrides") == 0)
 878                         test->overrides = value;
 879                 else if (strcmp(field, "code") == 0)
 880                         break;
 881                 else
 882                         c12r_errx(EXIT_BAD_INPUT, "Unknown field %s in %s",
 883                                   field, test->name);
 884         }
 885         if (!value)
 886                 c12r_errx(EXIT_BAD_INPUT, "Missing code in %s", test->name);
 887
 888         if (strlen(value) == 0) {
 889                 /* Multiline program, read to END comment */
 890                 while (fgets(buf, sizeof(buf), stdin) != 0) {
 891                         size_t n;
 892                         if (strncmp(buf, "/*END*/", 7) == 0)
 893                                 break;
 894                         n = strlen(value);
 895                         value = realloc(value, n + strlen(buf) + 1);
 896                         strcpy(value + n, buf);
 897                         n += strlen(buf);
 898                 }
 899         }
 900         test->fragment = value;
 901         return true;
 902 }
 903
 904 static void read_tests(size_t num_tests)
 905 {
 906         while (read_test(tests + num_tests)) {
 907                 num_tests++;
 908                 tests = realloc(tests, (num_tests + 1) * sizeof(tests[0]));
 909                 tests[num_tests].name = NULL;
 910         }
 911 }
 912
 913 int main(int argc, const char *argv[])
 914 {
 915         char *cmd;
 916         unsigned int i;
 917         const char *default_args[]
 918                 = { "", DEFAULT_COMPILER, DEFAULT_FLAGS, NULL };
 919         const char *outflag = DEFAULT_OUTPUT_EXE_FLAG;
 920         const char *configurator_cc = NULL;
 921         const char *wrapper = "";
 922         const char *orig_cc;
 923         const char *varfile = NULL;
 924         const char *headerfile = NULL;
 925         bool extra_tests = false;
 926         FILE *outf;
 927
 928         if (argc > 0)
 929                 progname = argv[0];
 930
 931         while (argc > 1) {
 932                 if (strcmp(argv[1], "--help") == 0) {
 933                         printf("Usage: configurator [-v] [--var-file=<filename>] [-O<outflag>] [--configurator-cc=<compiler-for-tests>] [--wrapper=<wrapper-for-tests>] [--autotools-style] [--extra-tests] [<compiler> <flags>...]\n"
 934                                "  <compiler> <flags> will have \"<outflag> <outfile> <infile.c>\" appended\n"
 935                                "Default: %s %s %s\n",
 936                                DEFAULT_COMPILER, DEFAULT_FLAGS,
 937                                DEFAULT_OUTPUT_EXE_FLAG);
 938                         exit(0);
 939                 }
 940                 if (strncmp(argv[1], "-O", 2) == 0) {
 941                         argc--;
 942                         argv++;
 943                         outflag = argv[1] + 2;
 944                         if (!*outflag) {
 945                                 fprintf(stderr,
 946                                         "%s: option requires an argument -- O\n",
 947                                         argv[0]);
 948                                 exit(EXIT_BAD_USAGE);
 949                         }
 950                 } else if (strcmp(argv[1], "-v") == 0) {
 951                         argc--;
 952                         argv++;
 953                         verbose++;
 954                 } else if (strcmp(argv[1], "-vv") == 0) {
 955                         argc--;
 956                         argv++;
 957                         verbose += 2;
 958                 } else if (strncmp(argv[1], "--configurator-cc=", 18) == 0) {
 959                         configurator_cc = argv[1] + 18;
 960                         argc--;
 961                         argv++;
 962                 } else if (strncmp(argv[1], "--wrapper=", 10) == 0) {
 963                         wrapper = argv[1] + 10;
 964                         argc--;
 965                         argv++;
 966                 } else if (strncmp(argv[1], "--var-file=", 11) == 0) {
 967                         varfile = argv[1] + 11;
 968                         argc--;
 969                         argv++;
 970                 } else if (strcmp(argv[1], "--autotools-style") == 0) {
 971                         like_a_libtool = true;
 972                         argc--;
 973                         argv++;
 974                 } else if (strncmp(argv[1], "--header-file=", 14) == 0) {
 975                         headerfile = argv[1] + 14;
 976                         argc--;
 977                         argv++;
 978                 } else if (strcmp(argv[1], "--extra-tests") == 0) {
 979                         extra_tests = true;
 980                         argc--;
 981                         argv++;
 982                 } else if (strcmp(argv[1], "--") == 0) {
 983                         break;
 984                 } else if (argv[1][0] == '-') {
 985                         c12r_errx(EXIT_BAD_USAGE, "Unknown option %s", argv[1]);
 986                 } else {
 987                         break;
 988                 }
 989         }
 990
 991         if (argc == 1)
 992                 argv = default_args;
 993
 994         /* Copy with NULL entry at end */
 995         tests = calloc(sizeof(base_tests)/sizeof(base_tests[0]) + 1,
 996                        sizeof(base_tests[0]));
 997         memcpy(tests, base_tests, sizeof(base_tests));
 998
 999         if (extra_tests)
1000                 read_tests(sizeof(base_tests)/sizeof(base_tests[0]));
1001
1002         orig_cc = argv[1];
1003         if (configurator_cc)
1004                 argv[1] = configurator_cc;
1005
1006         cmd = connect_args(argv, outflag, OUTPUT_FILE " " INPUT_FILE);
1007         if (like_a_libtool) {
1008                 start_test("Making autoconf users comfortable", "");
1009                 sleep(1);
1010                 end_test(1);
1011         }
1012         for (i = 0; tests[i].name; i++)
1013                 run_test(cmd, wrapper, &tests[i]);
1014         free(cmd);
1015
1016         remove(OUTPUT_FILE);
1017         remove(INPUT_FILE);
1018
1019         if (varfile) {
1020                 FILE *vars;
1021
1022                 if (strcmp(varfile, "-") == 0)
1023                         vars = stdout;
1024                 else {
1025                         start_test("Writing variables to ", varfile);
1026                         vars = fopen(varfile, "a");
1027                         if (!vars)
1028                                 c12r_err(EXIT_TROUBLE_RUNNING,
1029                                          "Could not open %s", varfile);
1030                 }
1031                 for (i = 0; tests[i].name; i++)
1032                         fprintf(vars, "%s=%u\n", tests[i].name, tests[i].answer);
1033                 if (vars != stdout) {
1034                         if (fclose(vars) != 0)
1035                                 c12r_err(EXIT_TROUBLE_RUNNING,
1036                                          "Closing %s", varfile);
1037                         end_test(1);
1038                 }
1039         }
1040
1041         if (headerfile) {
1042                 start_test("Writing header to ", headerfile);
1043                 outf = fopen(headerfile, "w");
1044                 if (!outf)
1045                         c12r_err(EXIT_TROUBLE_RUNNING,
1046                                  "Could not open %s", headerfile);
1047         } else
1048                 outf = stdout;
1049
1050         fprintf(outf, "/* Generated by CCAN configurator */\n"
1051                "#ifndef CCAN_CONFIG_H\n"
1052                "#define CCAN_CONFIG_H\n");
1053         fprintf(outf, "#ifndef _GNU_SOURCE\n");
1054         fprintf(outf, "#define _GNU_SOURCE /* Always use GNU extensions. */\n");
1055         fprintf(outf, "#endif\n");
1056         fprintf(outf, "#define CCAN_COMPILER \"%s\"\n", orig_cc);
1057         cmd = connect_args(argv + 1, "", "");
1058         fprintf(outf, "#define CCAN_CFLAGS \"%s\"\n", cmd);
1059         free(cmd);
1060         fprintf(outf, "#define CCAN_OUTPUT_EXE_CFLAG \"%s\"\n\n", outflag);
1061         /* This one implies "#include <ccan/..." works, eg. for tdb2.h */
1062         fprintf(outf, "#define HAVE_CCAN 1\n");
1063         for (i = 0; tests[i].name; i++)
1064                 fprintf(outf, "#define %s %u\n", tests[i].name, tests[i].answer);
1065         fprintf(outf, "#endif /* CCAN_CONFIG_H */\n");
1066
1067         if (headerfile) {
1068                 if (fclose(outf) != 0)
1069                         c12r_err(EXIT_TROUBLE_RUNNING, "Closing %s", headerfile);
1070                 end_test(1);
1071         }
1072
1073         return 0;
1074 }