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