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