re PR c++/84691 (internal compiler error: in poplevel_class, at cp/name-lookup.c...
[official-gcc.git] / gcc / incpath.c
blobb11c6a579396acf05cedb1460ad22efaefe52b78
1 /* Set up combined include path chain for the preprocessor.
2 Copyright (C) 1986-2018 Free Software Foundation, Inc.
4 Broken out of cppinit.c and cppfiles.c and rewritten Mar 2003.
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.
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.
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/>. */
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"
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
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
47 static const char dir_separator_str[] = { DIR_SEPARATOR, 0 };
49 static void add_env_var_paths (const char *, incpath_kind);
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);
58 /* Include chains heads and tails. */
59 static struct cpp_dir *heads[INC_MAX];
60 static struct cpp_dir *tails[INC_MAX];
62 static bool quote_ignores_source_dir;
63 enum { REASON_QUIET = 0, REASON_NOENT, REASON_DUP, REASON_DUP_SYS };
65 /* Free an element of the include chain, possibly giving a reason. */
66 static void
67 free_path (struct cpp_dir *path, int reason)
69 switch (reason)
71 case REASON_DUP:
72 case REASON_DUP_SYS:
73 fprintf (stderr, _("ignoring duplicate directory \"%s\"\n"), path->name);
74 if (reason == REASON_DUP_SYS)
75 fprintf (stderr,
76 _(" as it is a non-system directory that duplicates a system directory\n"));
77 break;
79 case REASON_NOENT:
80 fprintf (stderr, _("ignoring nonexistent directory \"%s\"\n"),
81 path->name);
82 break;
84 case REASON_QUIET:
85 default:
86 break;
89 free (path->name);
90 free (path);
93 /* Read ENV_VAR for a PATH_SEPARATOR-separated list of file names; and
94 append all the names to the search path CHAIN. */
95 static void
96 add_env_var_paths (const char *env_var, incpath_kind chain)
98 char *p, *q, *path;
100 q = getenv (env_var);
102 if (!q)
103 return;
105 for (p = q; *q; p = q + 1)
107 q = p;
108 while (*q != 0 && *q != PATH_SEPARATOR)
109 q++;
111 if (p == q)
112 path = xstrdup (".");
113 else
115 path = XNEWVEC (char, q - p + 1);
116 memcpy (path, p, q - p);
117 path[q - p] = '\0';
120 add_path (path, chain, chain == INC_SYSTEM, false);
124 /* Append the standard include chain defined in cppdefault.c. */
125 static void
126 add_standard_paths (const char *sysroot, const char *iprefix,
127 const char *imultilib, int cxx_stdinc)
129 const struct default_include *p;
130 int relocated = cpp_relocated ();
131 size_t len;
133 if (iprefix && (len = cpp_GCC_INCLUDE_DIR_len) != 0)
135 /* Look for directories that start with the standard prefix.
136 "Translate" them, i.e. replace /usr/local/lib/gcc... with
137 IPREFIX and search them first. */
138 for (p = cpp_include_defaults; p->fname; p++)
140 if (!p->cplusplus || cxx_stdinc)
142 /* Should we be translating sysrooted dirs too? Assume
143 that iprefix and sysroot are mutually exclusive, for
144 now. */
145 if (sysroot && p->add_sysroot)
146 continue;
147 if (!filename_ncmp (p->fname, cpp_GCC_INCLUDE_DIR, len))
149 char *str = concat (iprefix, p->fname + len, NULL);
150 if (p->multilib == 1 && imultilib)
151 str = reconcat (str, str, dir_separator_str,
152 imultilib, NULL);
153 else if (p->multilib == 2)
155 if (!imultiarch)
157 free (str);
158 continue;
160 str = reconcat (str, str, dir_separator_str,
161 imultiarch, NULL);
163 add_path (str, INC_SYSTEM, p->cxx_aware, false);
169 for (p = cpp_include_defaults; p->fname; p++)
171 if (!p->cplusplus || cxx_stdinc)
173 char *str;
175 /* Should this directory start with the sysroot? */
176 if (sysroot && p->add_sysroot)
178 char *sysroot_no_trailing_dir_separator = xstrdup (sysroot);
179 size_t sysroot_len = strlen (sysroot);
181 if (sysroot_len > 0 && sysroot[sysroot_len - 1] == DIR_SEPARATOR)
182 sysroot_no_trailing_dir_separator[sysroot_len - 1] = '\0';
183 str = concat (sysroot_no_trailing_dir_separator, p->fname, NULL);
184 free (sysroot_no_trailing_dir_separator);
186 else if (!p->add_sysroot && relocated
187 && !filename_ncmp (p->fname, cpp_PREFIX, cpp_PREFIX_len))
189 static const char *relocated_prefix;
190 char *ostr;
191 /* If this path starts with the configure-time prefix,
192 but the compiler has been relocated, replace it
193 with the run-time prefix. The run-time exec prefix
194 is GCC_EXEC_PREFIX. Compute the path from there back
195 to the toplevel prefix. */
196 if (!relocated_prefix)
198 char *dummy;
199 /* Make relative prefix expects the first argument
200 to be a program, not a directory. */
201 dummy = concat (gcc_exec_prefix, "dummy", NULL);
202 relocated_prefix
203 = make_relative_prefix (dummy,
204 cpp_EXEC_PREFIX,
205 cpp_PREFIX);
206 free (dummy);
208 ostr = concat (relocated_prefix,
209 p->fname + cpp_PREFIX_len,
210 NULL);
211 str = update_path (ostr, p->component);
212 free (ostr);
214 else
215 str = update_path (p->fname, p->component);
217 if (p->multilib == 1 && imultilib)
218 str = reconcat (str, str, dir_separator_str, imultilib, NULL);
219 else if (p->multilib == 2)
221 if (!imultiarch)
223 free (str);
224 continue;
226 str = reconcat (str, str, dir_separator_str, imultiarch, NULL);
229 add_path (str, INC_SYSTEM, p->cxx_aware, false);
234 /* For each duplicate path in chain HEAD, keep just the first one.
235 Remove each path in chain HEAD that also exists in chain SYSTEM.
236 Set the NEXT pointer of the last path in the resulting chain to
237 JOIN, unless it duplicates JOIN in which case the last path is
238 removed. Return the head of the resulting chain. Any of HEAD,
239 JOIN and SYSTEM can be NULL. */
241 static struct cpp_dir *
242 remove_duplicates (cpp_reader *pfile, struct cpp_dir *head,
243 struct cpp_dir *system, struct cpp_dir *join,
244 int verbose)
246 struct cpp_dir **pcur, *tmp, *cur;
247 struct stat st;
249 for (pcur = &head; *pcur; )
251 int reason = REASON_QUIET;
253 cur = *pcur;
255 if (stat (cur->name, &st))
257 /* Dirs that don't exist or have denied permissions are
258 silently ignored, unless verbose. */
259 if ((errno != ENOENT) && (errno != EPERM))
260 cpp_errno (pfile, CPP_DL_ERROR, cur->name);
261 else
263 /* If -Wmissing-include-dirs is given, warn. */
264 cpp_options *opts = cpp_get_options (pfile);
265 if (opts->warn_missing_include_dirs && cur->user_supplied_p)
266 cpp_warning (pfile, CPP_W_MISSING_INCLUDE_DIRS, "%s: %s",
267 cur->name, xstrerror (errno));
268 reason = REASON_NOENT;
271 else if (!S_ISDIR (st.st_mode))
272 cpp_error_with_line (pfile, CPP_DL_WARNING, 0, 0,
273 "%s: not a directory", cur->name);
274 else
276 #if defined (INO_T_COPY)
277 INO_T_COPY (cur->ino, st.st_ino);
278 cur->dev = st.st_dev;
279 #endif
281 /* Remove this one if it is in the system chain. */
282 reason = REASON_DUP_SYS;
283 for (tmp = system; tmp; tmp = tmp->next)
284 if (DIRS_EQ (tmp, cur) && cur->construct == tmp->construct)
285 break;
287 if (!tmp)
289 /* Duplicate of something earlier in the same chain? */
290 reason = REASON_DUP;
291 for (tmp = head; tmp != cur; tmp = tmp->next)
292 if (DIRS_EQ (cur, tmp) && cur->construct == tmp->construct)
293 break;
295 if (tmp == cur
296 /* Last in the chain and duplicate of JOIN? */
297 && !(cur->next == NULL && join
298 && DIRS_EQ (cur, join)
299 && cur->construct == join->construct))
301 /* Unique, so keep this directory. */
302 pcur = &cur->next;
303 continue;
308 /* Remove this entry from the chain. */
309 *pcur = cur->next;
310 free_path (cur, verbose ? reason: REASON_QUIET);
313 *pcur = join;
314 return head;
317 /* Add SYSROOT to any user-supplied paths in CHAIN starting with
318 "=" or "$SYSROOT". */
320 static void
321 add_sysroot_to_chain (const char *sysroot, int chain)
323 struct cpp_dir *p;
325 for (p = heads[chain]; p != NULL; p = p->next)
327 if (p->user_supplied_p)
329 if (p->name[0] == '=')
330 p->name = concat (sysroot, p->name + 1, NULL);
331 if (strncmp (p->name, "$SYSROOT", strlen ("$SYSROOT")) == 0)
332 p->name = concat (sysroot, p->name + strlen ("$SYSROOT"), NULL);
337 /* Merge the four include chains together in the order quote, bracket,
338 system, after. Remove duplicate dirs (determined in
339 system-specific manner).
341 We can't just merge the lists and then uniquify them because then
342 we may lose directories from the <> search path that should be
343 there; consider -iquote foo -iquote bar -Ifoo -Iquux. It is
344 however safe to treat -iquote bar -iquote foo -Ifoo -Iquux as if
345 written -iquote bar -Ifoo -Iquux. */
347 static void
348 merge_include_chains (const char *sysroot, cpp_reader *pfile, int verbose)
350 /* Add the sysroot to user-supplied paths starting with "=". */
351 if (sysroot)
353 add_sysroot_to_chain (sysroot, INC_QUOTE);
354 add_sysroot_to_chain (sysroot, INC_BRACKET);
355 add_sysroot_to_chain (sysroot, INC_SYSTEM);
356 add_sysroot_to_chain (sysroot, INC_AFTER);
359 /* Join the SYSTEM and AFTER chains. Remove duplicates in the
360 resulting SYSTEM chain. */
361 if (heads[INC_SYSTEM])
362 tails[INC_SYSTEM]->next = heads[INC_AFTER];
363 else
364 heads[INC_SYSTEM] = heads[INC_AFTER];
365 heads[INC_SYSTEM]
366 = remove_duplicates (pfile, heads[INC_SYSTEM], 0, 0, verbose);
368 /* Remove duplicates from BRACKET that are in itself or SYSTEM, and
369 join it to SYSTEM. */
370 heads[INC_BRACKET]
371 = remove_duplicates (pfile, heads[INC_BRACKET], heads[INC_SYSTEM],
372 heads[INC_SYSTEM], verbose);
374 /* Remove duplicates from QUOTE that are in itself or SYSTEM, and
375 join it to BRACKET. */
376 heads[INC_QUOTE]
377 = remove_duplicates (pfile, heads[INC_QUOTE], heads[INC_SYSTEM],
378 heads[INC_BRACKET], verbose);
380 /* If verbose, print the list of dirs to search. */
381 if (verbose)
383 struct cpp_dir *p;
385 fprintf (stderr, _("#include \"...\" search starts here:\n"));
386 for (p = heads[INC_QUOTE];; p = p->next)
388 if (p == heads[INC_BRACKET])
389 fprintf (stderr, _("#include <...> search starts here:\n"));
390 if (!p)
391 break;
392 fprintf (stderr, " %s\n", p->name);
394 fprintf (stderr, _("End of search list.\n"));
398 /* Use given -I paths for #include "..." but not #include <...>, and
399 don't search the directory of the present file for #include "...".
400 (Note that -I. -I- is not the same as the default setup; -I. uses
401 the compiler's working dir.) */
402 void
403 split_quote_chain (void)
405 if (heads[INC_QUOTE])
406 free_path (heads[INC_QUOTE], REASON_QUIET);
407 if (tails[INC_QUOTE])
408 free_path (tails[INC_QUOTE], REASON_QUIET);
409 heads[INC_QUOTE] = heads[INC_BRACKET];
410 tails[INC_QUOTE] = tails[INC_BRACKET];
411 heads[INC_BRACKET] = NULL;
412 tails[INC_BRACKET] = NULL;
413 /* This is NOT redundant. */
414 quote_ignores_source_dir = true;
417 /* Add P to the chain specified by CHAIN. */
419 void
420 add_cpp_dir_path (cpp_dir *p, incpath_kind chain)
422 if (tails[chain])
423 tails[chain]->next = p;
424 else
425 heads[chain] = p;
426 tails[chain] = p;
429 /* Add PATH to the include chain CHAIN. PATH must be malloc-ed and
430 NUL-terminated. */
431 void
432 add_path (char *path, incpath_kind chain, int cxx_aware, bool user_supplied_p)
434 cpp_dir *p;
436 #if defined (HAVE_DOS_BASED_FILE_SYSTEM)
437 /* Remove unnecessary trailing slashes. On some versions of MS
438 Windows, trailing _forward_ slashes cause no problems for stat().
439 On newer versions, stat() does not recognize a directory that ends
440 in a '\\' or '/', unless it is a drive root dir, such as "c:/",
441 where it is obligatory. */
442 int pathlen = strlen (path);
443 char* end = path + pathlen - 1;
444 /* Preserve the lead '/' or lead "c:/". */
445 char* start = path + (pathlen > 2 && path[1] == ':' ? 3 : 1);
447 for (; end > start && IS_DIR_SEPARATOR (*end); end--)
448 *end = 0;
449 #endif
451 p = XNEW (cpp_dir);
452 p->next = NULL;
453 p->name = path;
454 #ifndef INO_T_EQ
455 p->canonical_name = lrealpath (path);
456 #endif
457 if (chain == INC_SYSTEM || chain == INC_AFTER)
458 p->sysp = 1 + !cxx_aware;
459 else
460 p->sysp = 0;
461 p->construct = 0;
462 p->user_supplied_p = user_supplied_p;
464 add_cpp_dir_path (p, chain);
467 /* Exported function to handle include chain merging, duplicate
468 removal, and registration with cpplib. */
469 void
470 register_include_chains (cpp_reader *pfile, const char *sysroot,
471 const char *iprefix, const char *imultilib,
472 int stdinc, int cxx_stdinc, int verbose)
474 static const char *const lang_env_vars[] =
475 { "C_INCLUDE_PATH", "CPLUS_INCLUDE_PATH",
476 "OBJC_INCLUDE_PATH", "OBJCPLUS_INCLUDE_PATH" };
477 cpp_options *cpp_opts = cpp_get_options (pfile);
478 size_t idx = (cpp_opts->objc ? 2: 0);
480 if (cpp_opts->cplusplus)
481 idx++;
482 else
483 cxx_stdinc = false;
485 /* CPATH and language-dependent environment variables may add to the
486 include chain. */
487 add_env_var_paths ("CPATH", INC_BRACKET);
488 add_env_var_paths (lang_env_vars[idx], INC_SYSTEM);
490 target_c_incpath.extra_pre_includes (sysroot, iprefix, stdinc);
492 /* Finally chain on the standard directories. */
493 if (stdinc)
494 add_standard_paths (sysroot, iprefix, imultilib, cxx_stdinc);
496 target_c_incpath.extra_includes (sysroot, iprefix, stdinc);
498 merge_include_chains (sysroot, pfile, verbose);
500 cpp_set_include_chains (pfile, heads[INC_QUOTE], heads[INC_BRACKET],
501 quote_ignores_source_dir);
504 /* Return the current chain of cpp dirs. */
506 struct cpp_dir *
507 get_added_cpp_dirs (incpath_kind chain)
509 return heads[chain];
512 #if !(defined TARGET_EXTRA_INCLUDES) || !(defined TARGET_EXTRA_PRE_INCLUDES)
513 static void hook_void_charptr_charptr_int (const char *sysroot ATTRIBUTE_UNUSED,
514 const char *iprefix ATTRIBUTE_UNUSED,
515 int stdinc ATTRIBUTE_UNUSED)
518 #endif
520 #ifndef TARGET_EXTRA_INCLUDES
521 #define TARGET_EXTRA_INCLUDES hook_void_charptr_charptr_int
522 #endif
523 #ifndef TARGET_EXTRA_PRE_INCLUDES
524 #define TARGET_EXTRA_PRE_INCLUDES hook_void_charptr_charptr_int
525 #endif
527 struct target_c_incpath_s target_c_incpath = { TARGET_EXTRA_PRE_INCLUDES, TARGET_EXTRA_INCLUDES };