gcc/incpath.c

   1 /* Set up combined include path chain for the preprocessor.
   2    Copyright (C) 1986-2017 Free Software Foundation, Inc.
   3
   4    Broken out of cppinit.c and cppfiles.c and rewritten Mar 2003.
   5
   6    This program is free software; you can redistribute it and/or modify it
   7    under the terms of the GNU General Public License as published by the
   8    Free Software Foundation; either version 3, or (at your option) any
   9    later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; see the file COPYING3.  If not see
  18    <http://www.gnu.org/licenses/>.  */
  19
  20 #include "config.h"
  21 #include "system.h"
  22 #include "coretypes.h"
  23 #include "target.h"
  24 #include "cpplib.h"
  25 #include "prefix.h"
  26 #include "intl.h"
  27 #include "incpath.h"
  28 #include "cppdefault.h"
  29
  30 /* Microsoft Windows does not natively support inodes.
  31    VMS has non-numeric inodes.  */
  32 #ifdef VMS
  33 # define INO_T_EQ(A, B) (!memcmp (&(A), &(B), sizeof (A)))
  34 # define INO_T_COPY(DEST, SRC) memcpy (&(DEST), &(SRC), sizeof (SRC))
  35 #elif !defined (HOST_LACKS_INODE_NUMBERS)
  36 # define INO_T_EQ(A, B) ((A) == (B))
  37 # define INO_T_COPY(DEST, SRC) (DEST) = (SRC)
  38 #endif
  39
  40 #if defined INO_T_EQ
  41 #define DIRS_EQ(A, B) ((A)->dev == (B)->dev \
  42         && INO_T_EQ ((A)->ino, (B)->ino))
  43 #else
  44 #define DIRS_EQ(A, B) (!filename_cmp ((A)->canonical_name, (B)->canonical_name))
  45 #endif
  46
  47 static const char dir_separator_str[] = { DIR_SEPARATOR, 0 };
  48
  49 static void add_env_var_paths (const char *, int);
  50 static void add_standard_paths (const char *, const char *, const char *, int);
  51 static void free_path (struct cpp_dir *, int);
  52 static void merge_include_chains (const char *, cpp_reader *, int);
  53 static void add_sysroot_to_chain (const char *, int);
  54 static struct cpp_dir *remove_duplicates (cpp_reader *, struct cpp_dir *,
  55                                            struct cpp_dir *,
  56                                            struct cpp_dir *, int);
  57
  58 /* Include chains heads and tails.  */
  59 static struct cpp_dir *heads[4];
  60 static struct cpp_dir *tails[4];
  61 static bool quote_ignores_source_dir;
  62 enum { REASON_QUIET = 0, REASON_NOENT, REASON_DUP, REASON_DUP_SYS };
  63
  64 /* Free an element of the include chain, possibly giving a reason.  */
  65 static void
  66 free_path (struct cpp_dir *path, int reason)
  67 {
  68   switch (reason)
  69     {
  70     case REASON_DUP:
  71     case REASON_DUP_SYS:
  72       fprintf (stderr, _("ignoring duplicate directory \"%s\"\n"), path->name);
  73       if (reason == REASON_DUP_SYS)
  74         fprintf (stderr,
  75  _("  as it is a non-system directory that duplicates a system directory\n"));
  76       break;
  77
  78     case REASON_NOENT:
  79       fprintf (stderr, _("ignoring nonexistent directory \"%s\"\n"),
  80                path->name);
  81       break;
  82
  83     case REASON_QUIET:
  84     default:
  85       break;
  86     }
  87
  88   free (path->name);
  89   free (path);
  90 }
  91
  92 /* Read ENV_VAR for a PATH_SEPARATOR-separated list of file names; and
  93    append all the names to the search path CHAIN.  */
  94 static void
  95 add_env_var_paths (const char *env_var, int chain)
  96 {
  97   char *p, *q, *path;
  98
  99   q = getenv (env_var);
 100
 101   if (!q)
 102     return;
 103
 104   for (p = q; *q; p = q + 1)
 105     {
 106       q = p;
 107       while (*q != 0 && *q != PATH_SEPARATOR)
 108         q++;
 109
 110       if (p == q)
 111         path = xstrdup (".");
 112       else
 113         {
 114           path = XNEWVEC (char, q - p + 1);
 115           memcpy (path, p, q - p);
 116           path[q - p] = '\0';
 117         }
 118
 119       add_path (path, chain, chain == SYSTEM, false);
 120     }
 121 }
 122
 123 /* Append the standard include chain defined in cppdefault.c.  */
 124 static void
 125 add_standard_paths (const char *sysroot, const char *iprefix,
 126                     const char *imultilib, int cxx_stdinc)
 127 {
 128   const struct default_include *p;
 129   int relocated = cpp_relocated ();
 130   size_t len;
 131
 132   if (iprefix && (len = cpp_GCC_INCLUDE_DIR_len) != 0)
 133     {
 134       /* Look for directories that start with the standard prefix.
 135          "Translate" them, i.e. replace /usr/local/lib/gcc... with
 136          IPREFIX and search them first.  */
 137       for (p = cpp_include_defaults; p->fname; p++)
 138         {
 139           if (!p->cplusplus || cxx_stdinc)
 140             {
 141               /* Should we be translating sysrooted dirs too?  Assume
 142                  that iprefix and sysroot are mutually exclusive, for
 143                  now.  */
 144               if (sysroot && p->add_sysroot)
 145                 continue;
 146               if (!filename_ncmp (p->fname, cpp_GCC_INCLUDE_DIR, len))
 147                 {
 148                   char *str = concat (iprefix, p->fname + len, NULL);
 149                   if (p->multilib == 1 && imultilib)
 150                     str = reconcat (str, str, dir_separator_str,
 151                                     imultilib, NULL);
 152                   else if (p->multilib == 2)
 153                     {
 154                       if (!imultiarch)
 155                         {
 156                           free (str);
 157                           continue;
 158                         }
 159                       str = reconcat (str, str, dir_separator_str,
 160                                       imultiarch, NULL);
 161                     }
 162                   add_path (str, SYSTEM, p->cxx_aware, false);
 163                 }
 164             }
 165         }
 166     }
 167
 168   for (p = cpp_include_defaults; p->fname; p++)
 169     {
 170       if (!p->cplusplus || cxx_stdinc)
 171         {
 172           char *str;
 173
 174           /* Should this directory start with the sysroot?  */
 175           if (sysroot && p->add_sysroot)
 176             {
 177               char *sysroot_no_trailing_dir_separator = xstrdup (sysroot);
 178               size_t sysroot_len = strlen (sysroot);
 179
 180               if (sysroot_len > 0 && sysroot[sysroot_len - 1] == DIR_SEPARATOR)
 181                 sysroot_no_trailing_dir_separator[sysroot_len - 1] = '\0';
 182               str = concat (sysroot_no_trailing_dir_separator, p->fname, NULL);
 183               free (sysroot_no_trailing_dir_separator);
 184             }
 185           else if (!p->add_sysroot && relocated
 186                    && !filename_ncmp (p->fname, cpp_PREFIX, cpp_PREFIX_len))
 187             {
 188               static const char *relocated_prefix;
 189               char *ostr;
 190               /* If this path starts with the configure-time prefix,
 191                  but the compiler has been relocated, replace it
 192                  with the run-time prefix.  The run-time exec prefix
 193                  is GCC_EXEC_PREFIX.  Compute the path from there back
 194                  to the toplevel prefix.  */
 195               if (!relocated_prefix)
 196                 {
 197                   char *dummy;
 198                   /* Make relative prefix expects the first argument
 199                      to be a program, not a directory.  */
 200                   dummy = concat (gcc_exec_prefix, "dummy", NULL);
 201                   relocated_prefix
 202                     = make_relative_prefix (dummy,
 203                                             cpp_EXEC_PREFIX,
 204                                             cpp_PREFIX);
 205                   free (dummy);
 206                 }
 207               ostr = concat (relocated_prefix,
 208                              p->fname + cpp_PREFIX_len,
 209                              NULL);
 210               str = update_path (ostr, p->component);
 211               free (ostr);
 212             }
 213           else
 214             str = update_path (p->fname, p->component);
 215
 216           if (p->multilib == 1 && imultilib)
 217             str = reconcat (str, str, dir_separator_str, imultilib, NULL);
 218           else if (p->multilib == 2)
 219             {
 220               if (!imultiarch)
 221                 {
 222                   free (str);
 223                   continue;
 224                 }
 225               str = reconcat (str, str, dir_separator_str, imultiarch, NULL);
 226             }
 227
 228           add_path (str, SYSTEM, p->cxx_aware, false);
 229         }
 230     }
 231 }
 232
 233 /* For each duplicate path in chain HEAD, keep just the first one.
 234    Remove each path in chain HEAD that also exists in chain SYSTEM.
 235    Set the NEXT pointer of the last path in the resulting chain to
 236    JOIN, unless it duplicates JOIN in which case the last path is
 237    removed.  Return the head of the resulting chain.  Any of HEAD,
 238    JOIN and SYSTEM can be NULL.  */
 239
 240 static struct cpp_dir *
 241 remove_duplicates (cpp_reader *pfile, struct cpp_dir *head,
 242                    struct cpp_dir *system, struct cpp_dir *join,
 243                    int verbose)
 244 {
 245   struct cpp_dir **pcur, *tmp, *cur;
 246   struct stat st;
 247
 248   for (pcur = &head; *pcur; )
 249     {
 250       int reason = REASON_QUIET;
 251
 252       cur = *pcur;
 253
 254       if (stat (cur->name, &st))
 255         {
 256           /* Dirs that don't exist or have denied permissions are
 257              silently ignored, unless verbose.  */
 258           if ((errno != ENOENT) && (errno != EPERM))
 259             cpp_errno (pfile, CPP_DL_ERROR, cur->name);
 260           else
 261             {
 262               /* If -Wmissing-include-dirs is given, warn.  */
 263               cpp_options *opts = cpp_get_options (pfile);
 264               if (opts->warn_missing_include_dirs && cur->user_supplied_p)
 265                 cpp_warning (pfile, CPP_W_MISSING_INCLUDE_DIRS, "%s: %s",
 266                              cur->name, xstrerror (errno));
 267               reason = REASON_NOENT;
 268             }
 269         }
 270       else if (!S_ISDIR (st.st_mode))
 271         cpp_error_with_line (pfile, CPP_DL_WARNING, 0, 0,
 272                              "%s: not a directory", cur->name);
 273       else
 274         {
 275 #if defined (INO_T_COPY)
 276           INO_T_COPY (cur->ino, st.st_ino);
 277           cur->dev  = st.st_dev;
 278 #endif
 279
 280           /* Remove this one if it is in the system chain.  */
 281           reason = REASON_DUP_SYS;
 282           for (tmp = system; tmp; tmp = tmp->next)
 283            if (DIRS_EQ (tmp, cur) && cur->construct == tmp->construct)
 284               break;
 285
 286           if (!tmp)
 287             {
 288               /* Duplicate of something earlier in the same chain?  */
 289               reason = REASON_DUP;
 290               for (tmp = head; tmp != cur; tmp = tmp->next)
 291                if (DIRS_EQ (cur, tmp) && cur->construct == tmp->construct)
 292                   break;
 293
 294               if (tmp == cur
 295                   /* Last in the chain and duplicate of JOIN?  */
 296                   && !(cur->next == NULL && join
 297                        && DIRS_EQ (cur, join)
 298                        && cur->construct == join->construct))
 299                 {
 300                   /* Unique, so keep this directory.  */
 301                   pcur = &cur->next;
 302                   continue;
 303                 }
 304             }
 305         }
 306
 307       /* Remove this entry from the chain.  */
 308       *pcur = cur->next;
 309       free_path (cur, verbose ? reason: REASON_QUIET);
 310     }
 311
 312   *pcur = join;
 313   return head;
 314 }
 315
 316 /* Add SYSROOT to any user-supplied paths in CHAIN starting with
 317    "=".  */
 318
 319 static void
 320 add_sysroot_to_chain (const char *sysroot, int chain)
 321 {
 322   struct cpp_dir *p;
 323
 324   for (p = heads[chain]; p != NULL; p = p->next)
 325     if (p->name[0] == '=' && p->user_supplied_p)
 326       p->name = concat (sysroot, p->name + 1, NULL);
 327 }
 328
 329 /* Merge the four include chains together in the order quote, bracket,
 330    system, after.  Remove duplicate dirs (determined in
 331    system-specific manner).
 332
 333    We can't just merge the lists and then uniquify them because then
 334    we may lose directories from the <> search path that should be
 335    there; consider -iquote foo -iquote bar -Ifoo -Iquux.  It is
 336    however safe to treat -iquote bar -iquote foo -Ifoo -Iquux as if
 337    written -iquote bar -Ifoo -Iquux.  */
 338
 339 static void
 340 merge_include_chains (const char *sysroot, cpp_reader *pfile, int verbose)
 341 {
 342   /* Add the sysroot to user-supplied paths starting with "=".  */
 343   if (sysroot)
 344     {
 345       add_sysroot_to_chain (sysroot, QUOTE);
 346       add_sysroot_to_chain (sysroot, BRACKET);
 347       add_sysroot_to_chain (sysroot, SYSTEM);
 348       add_sysroot_to_chain (sysroot, AFTER);
 349     }
 350
 351   /* Join the SYSTEM and AFTER chains.  Remove duplicates in the
 352      resulting SYSTEM chain.  */
 353   if (heads[SYSTEM])
 354     tails[SYSTEM]->next = heads[AFTER];
 355   else
 356     heads[SYSTEM] = heads[AFTER];
 357   heads[SYSTEM] = remove_duplicates (pfile, heads[SYSTEM], 0, 0, verbose);
 358
 359   /* Remove duplicates from BRACKET that are in itself or SYSTEM, and
 360      join it to SYSTEM.  */
 361   heads[BRACKET] = remove_duplicates (pfile, heads[BRACKET], heads[SYSTEM],
 362                                       heads[SYSTEM], verbose);
 363
 364   /* Remove duplicates from QUOTE that are in itself or SYSTEM, and
 365      join it to BRACKET.  */
 366   heads[QUOTE] = remove_duplicates (pfile, heads[QUOTE], heads[SYSTEM],
 367                                     heads[BRACKET], verbose);
 368
 369   /* If verbose, print the list of dirs to search.  */
 370   if (verbose)
 371     {
 372       struct cpp_dir *p;
 373
 374       fprintf (stderr, _("#include \"...\" search starts here:\n"));
 375       for (p = heads[QUOTE];; p = p->next)
 376         {
 377           if (p == heads[BRACKET])
 378             fprintf (stderr, _("#include <...> search starts here:\n"));
 379           if (!p)
 380             break;
 381           fprintf (stderr, " %s\n", p->name);
 382         }
 383       fprintf (stderr, _("End of search list.\n"));
 384     }
 385 }
 386
 387 /* Use given -I paths for #include "..." but not #include <...>, and
 388    don't search the directory of the present file for #include "...".
 389    (Note that -I. -I- is not the same as the default setup; -I. uses
 390    the compiler's working dir.)  */
 391 void
 392 split_quote_chain (void)
 393 {
 394   if (heads[QUOTE])
 395     free_path (heads[QUOTE], REASON_QUIET);
 396   if (tails[QUOTE])
 397     free_path (tails[QUOTE], REASON_QUIET);
 398   heads[QUOTE] = heads[BRACKET];
 399   tails[QUOTE] = tails[BRACKET];
 400   heads[BRACKET] = NULL;
 401   tails[BRACKET] = NULL;
 402   /* This is NOT redundant.  */
 403   quote_ignores_source_dir = true;
 404 }
 405
 406 /* Add P to the chain specified by CHAIN.  */
 407
 408 void
 409 add_cpp_dir_path (cpp_dir *p, int chain)
 410 {
 411   if (tails[chain])
 412     tails[chain]->next = p;
 413   else
 414     heads[chain] = p;
 415   tails[chain] = p;
 416 }
 417
 418 /* Add PATH to the include chain CHAIN. PATH must be malloc-ed and
 419    NUL-terminated.  */
 420 void
 421 add_path (char *path, int chain, int cxx_aware, bool user_supplied_p)
 422 {
 423   cpp_dir *p;
 424
 425 #if defined (HAVE_DOS_BASED_FILE_SYSTEM)
 426   /* Remove unnecessary trailing slashes.  On some versions of MS
 427      Windows, trailing  _forward_ slashes cause no problems for stat().
 428      On newer versions, stat() does not recognize a directory that ends
 429      in a '\\' or '/', unless it is a drive root dir, such as "c:/",
 430      where it is obligatory.  */
 431   int pathlen = strlen (path);
 432   char* end = path + pathlen - 1;
 433   /* Preserve the lead '/' or lead "c:/".  */
 434   char* start = path + (pathlen > 2 && path[1] == ':' ? 3 : 1);
 435
 436   for (; end > start && IS_DIR_SEPARATOR (*end); end--)
 437     *end = 0;
 438 #endif
 439
 440   p = XNEW (cpp_dir);
 441   p->next = NULL;
 442   p->name = path;
 443 #ifndef INO_T_EQ
 444   p->canonical_name = lrealpath (path);
 445 #endif
 446   if (chain == SYSTEM || chain == AFTER)
 447     p->sysp = 1 + !cxx_aware;
 448   else
 449     p->sysp = 0;
 450   p->construct = 0;
 451   p->user_supplied_p = user_supplied_p;
 452
 453   add_cpp_dir_path (p, chain);
 454 }
 455
 456 /* Exported function to handle include chain merging, duplicate
 457    removal, and registration with cpplib.  */
 458 void
 459 register_include_chains (cpp_reader *pfile, const char *sysroot,
 460                          const char *iprefix, const char *imultilib,
 461                          int stdinc, int cxx_stdinc, int verbose)
 462 {
 463   static const char *const lang_env_vars[] =
 464     { "C_INCLUDE_PATH", "CPLUS_INCLUDE_PATH",
 465       "OBJC_INCLUDE_PATH", "OBJCPLUS_INCLUDE_PATH" };
 466   cpp_options *cpp_opts = cpp_get_options (pfile);
 467   size_t idx = (cpp_opts->objc ? 2: 0);
 468
 469   if (cpp_opts->cplusplus)
 470     idx++;
 471   else
 472     cxx_stdinc = false;
 473
 474   /* CPATH and language-dependent environment variables may add to the
 475      include chain.  */
 476   add_env_var_paths ("CPATH", BRACKET);
 477   add_env_var_paths (lang_env_vars[idx], SYSTEM);
 478
 479   target_c_incpath.extra_pre_includes (sysroot, iprefix, stdinc);
 480
 481   /* Finally chain on the standard directories.  */
 482   if (stdinc)
 483     add_standard_paths (sysroot, iprefix, imultilib, cxx_stdinc);
 484
 485   target_c_incpath.extra_includes (sysroot, iprefix, stdinc);
 486
 487   merge_include_chains (sysroot, pfile, verbose);
 488
 489   cpp_set_include_chains (pfile, heads[QUOTE], heads[BRACKET],
 490                           quote_ignores_source_dir);
 491 }
 492
 493 /* Return the current chain of cpp dirs.  */
 494
 495 struct cpp_dir *
 496 get_added_cpp_dirs (int chain)
 497 {
 498   return heads[chain];
 499 }
 500
 501 #if !(defined TARGET_EXTRA_INCLUDES) || !(defined TARGET_EXTRA_PRE_INCLUDES)
 502 static void hook_void_charptr_charptr_int (const char *sysroot ATTRIBUTE_UNUSED,
 503                                            const char *iprefix ATTRIBUTE_UNUSED,
 504                                            int stdinc ATTRIBUTE_UNUSED)
 505 {
 506 }
 507 #endif
 508
 509 #ifndef TARGET_EXTRA_INCLUDES
 510 #define TARGET_EXTRA_INCLUDES hook_void_charptr_charptr_int
 511 #endif
 512 #ifndef TARGET_EXTRA_PRE_INCLUDES
 513 #define TARGET_EXTRA_PRE_INCLUDES hook_void_charptr_charptr_int
 514 #endif
 515
 516 struct target_c_incpath_s target_c_incpath = { TARGET_EXTRA_PRE_INCLUDES, TARGET_EXTRA_INCLUDES };
 517