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