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