/* Set up combined include path chain for the preprocessor. Copyright (C) 1986, 1987, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006 Free Software Foundation, Inc. Broken out of cppinit.c and cppfiles.c and rewritten Mar 2003. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ #include "config.h" #include "system.h" #include "coretypes.h" #include "machmode.h" #include "target.h" #include "tm.h" #include "cpplib.h" #include "prefix.h" #include "intl.h" #include "c-incpath.h" #include "cppdefault.h" /* Windows does not natively support inodes, and neither does MSDOS. Cygwin's emulation can generate non-unique inodes, so don't use it. VMS has non-numeric inodes. */ #ifdef VMS # define INO_T_EQ(A, B) (!memcmp (&(A), &(B), sizeof (A))) # define INO_T_COPY(DEST, SRC) memcpy(&(DEST), &(SRC), sizeof (SRC)) #else # if (defined _WIN32 && !defined (_UWIN)) || defined __MSDOS__ # define INO_T_EQ(A, B) 0 # else # define INO_T_EQ(A, B) ((A) == (B)) # endif # define INO_T_COPY(DEST, SRC) (DEST) = (SRC) #endif static const char dir_separator_str[] = { DIR_SEPARATOR, 0 }; static void add_env_var_paths (const char *, int); static void add_standard_paths (const char *, const char *, const char *, int); static void free_path (struct cpp_dir *, int); static void merge_include_chains (cpp_reader *, int); static struct cpp_dir *remove_duplicates (cpp_reader *, struct cpp_dir *, struct cpp_dir *, struct cpp_dir *, int); /* Include chains heads and tails. */ /* BEGIN GCC-XML MODIFICATIONS (2007/10/31 15:07:01) */ static struct cpp_dir *heads[5]; static struct cpp_dir *tails[5]; /* END GCC-XML MODIFICATIONS (2007/10/31 15:07:01) */ static bool quote_ignores_source_dir; enum { REASON_QUIET = 0, REASON_NOENT, REASON_DUP, REASON_DUP_SYS }; /* Free an element of the include chain, possibly giving a reason. */ static void free_path (struct cpp_dir *path, int reason) { switch (reason) { case REASON_DUP: case REASON_DUP_SYS: fprintf (stderr, _("ignoring duplicate directory \"%s\"\n"), path->name); if (reason == REASON_DUP_SYS) fprintf (stderr, _(" as it is a non-system directory that duplicates a system directory\n")); break; case REASON_NOENT: fprintf (stderr, _("ignoring nonexistent directory \"%s\"\n"), path->name); break; case REASON_QUIET: default: break; } free (path->name); free (path); } /* Read ENV_VAR for a PATH_SEPARATOR-separated list of file names; and append all the names to the search path CHAIN. */ static void add_env_var_paths (const char *env_var, int chain) { char *p, *q, *path; GET_ENVIRONMENT (q, env_var); if (!q) return; for (p = q; *q; p = q + 1) { q = p; while (*q != 0 && *q != PATH_SEPARATOR) q++; if (p == q) path = xstrdup ("."); else { path = XNEWVEC (char, q - p + 1); memcpy (path, p, q - p); path[q - p] = '\0'; } add_path (path, chain, chain == SYSTEM, false); } } /* Append the standard include chain defined in cppdefault.c. */ static void add_standard_paths (const char *sysroot, const char *iprefix, const char *imultilib, int cxx_stdinc) { const struct default_include *p; size_t len; if (iprefix && (len = cpp_GCC_INCLUDE_DIR_len) != 0) { /* Look for directories that start with the standard prefix. "Translate" them, i.e. replace /usr/local/lib/gcc... with IPREFIX and search them first. */ for (p = cpp_include_defaults; p->fname; p++) { if (!p->cplusplus || cxx_stdinc) { /* Should we be translating sysrooted dirs too? Assume that iprefix and sysroot are mutually exclusive, for now. */ if (sysroot && p->add_sysroot) continue; if (!strncmp (p->fname, cpp_GCC_INCLUDE_DIR, len)) { char *str = concat (iprefix, p->fname + len, NULL); if (p->multilib && imultilib) str = concat (str, dir_separator_str, imultilib, NULL); add_path (str, SYSTEM, p->cxx_aware, false); } } } } for (p = cpp_include_defaults; p->fname; p++) { if (!p->cplusplus || cxx_stdinc) { char *str; /* Should this directory start with the sysroot? */ if (sysroot && p->add_sysroot) str = concat (sysroot, p->fname, NULL); else str = update_path (p->fname, p->component); if (p->multilib && imultilib) str = concat (str, dir_separator_str, imultilib, NULL); add_path (str, SYSTEM, p->cxx_aware, false); } } } /* For each duplicate path in chain HEAD, keep just the first one. Remove each path in chain HEAD that also exists in chain SYSTEM. Set the NEXT pointer of the last path in the resulting chain to JOIN, unless it duplicates JOIN in which case the last path is removed. Return the head of the resulting chain. Any of HEAD, JOIN and SYSTEM can be NULL. */ static struct cpp_dir * remove_duplicates (cpp_reader *pfile, struct cpp_dir *head, struct cpp_dir *system, struct cpp_dir *join, int verbose) { struct cpp_dir **pcur, *tmp, *cur; struct stat st; for (pcur = &head; *pcur; ) { int reason = REASON_QUIET; cur = *pcur; if (stat (cur->name, &st)) { /* Dirs that don't exist are silently ignored, unless verbose. */ if (errno != ENOENT) cpp_errno (pfile, CPP_DL_ERROR, cur->name); else { /* If -Wmissing-include-dirs is given, warn. */ cpp_options *opts = cpp_get_options (pfile); if (opts->warn_missing_include_dirs && cur->user_supplied_p) cpp_errno (pfile, CPP_DL_WARNING, cur->name); reason = REASON_NOENT; } } else if (!S_ISDIR (st.st_mode)) cpp_error_with_line (pfile, CPP_DL_ERROR, 0, 0, "%s: not a directory", cur->name); else { INO_T_COPY (cur->ino, st.st_ino); cur->dev = st.st_dev; /* Remove this one if it is in the system chain. */ reason = REASON_DUP_SYS; for (tmp = system; tmp; tmp = tmp->next) if (INO_T_EQ (tmp->ino, cur->ino) && tmp->dev == cur->dev && cur->construct == tmp->construct) break; if (!tmp) { /* Duplicate of something earlier in the same chain? */ reason = REASON_DUP; for (tmp = head; tmp != cur; tmp = tmp->next) if (INO_T_EQ (cur->ino, tmp->ino) && cur->dev == tmp->dev && cur->construct == tmp->construct) break; if (tmp == cur /* Last in the chain and duplicate of JOIN? */ && !(cur->next == NULL && join && INO_T_EQ (cur->ino, join->ino) && cur->dev == join->dev && cur->construct == join->construct)) { /* Unique, so keep this directory. */ pcur = &cur->next; continue; } } } /* Remove this entry from the chain. */ *pcur = cur->next; free_path (cur, verbose ? reason: REASON_QUIET); } *pcur = join; return head; } /* Merge the four include chains together in the order quote, bracket, system, after. Remove duplicate dirs (as determined by INO_T_EQ()). We can't just merge the lists and then uniquify them because then we may lose directories from the <> search path that should be there; consider -iquote foo -iquote bar -Ifoo -Iquux. It is however safe to treat -iquote bar -iquote foo -Ifoo -Iquux as if written -iquote bar -Ifoo -Iquux. */ static void merge_include_chains (cpp_reader *pfile, int verbose) { /* Join the SYSTEM and AFTER chains. Remove duplicates in the resulting SYSTEM chain. */ if (heads[SYSTEM]) tails[SYSTEM]->next = heads[AFTER]; else heads[SYSTEM] = heads[AFTER]; heads[SYSTEM] = remove_duplicates (pfile, heads[SYSTEM], 0, 0, verbose); /* Remove duplicates from BRACKET that are in itself or SYSTEM, and join it to SYSTEM. */ heads[BRACKET] = remove_duplicates (pfile, heads[BRACKET], heads[SYSTEM], heads[SYSTEM], verbose); /* Remove duplicates from QUOTE that are in itself or SYSTEM, and join it to BRACKET. */ heads[QUOTE] = remove_duplicates (pfile, heads[QUOTE], heads[SYSTEM], heads[BRACKET], verbose); /* BEGIN GCC-XML MODIFICATIONS (2007/10/31 15:07:01) */ /* Remove duplicates from WRAPPER that are in itself or SYSTEM. Do not join it to anything so it can be searched independently. */ heads[WRAPPER] = remove_duplicates (pfile, heads[WRAPPER], heads[SYSTEM], 0, verbose); /* END GCC-XML MODIFICATIONS (2007/10/31 15:07:01) */ /* If verbose, print the list of dirs to search. */ if (verbose) { struct cpp_dir *p; /* BEGIN GCC-XML MODIFICATIONS (2007/10/31 15:07:01) */ fprintf (stderr, _("#include wrapper search starts here:\n")); for (p = heads[WRAPPER]; p; p = p->next) { fprintf (stderr, " %s\n", p->name); } /* END GCC-XML MODIFICATIONS (2007/10/31 15:07:01) */ fprintf (stderr, _("#include \"...\" search starts here:\n")); for (p = heads[QUOTE];; p = p->next) { if (p == heads[BRACKET]) fprintf (stderr, _("#include <...> search starts here:\n")); if (!p) break; fprintf (stderr, " %s\n", p->name); } fprintf (stderr, _("End of search list.\n")); } } /* Use given -I paths for #include "..." but not #include <...>, and don't search the directory of the present file for #include "...". (Note that -I. -I- is not the same as the default setup; -I. uses the compiler's working dir.) */ void split_quote_chain (void) { heads[QUOTE] = heads[BRACKET]; tails[QUOTE] = tails[BRACKET]; heads[BRACKET] = NULL; tails[BRACKET] = NULL; /* This is NOT redundant. */ quote_ignores_source_dir = true; } /* Add P to the chain specified by CHAIN. */ void add_cpp_dir_path (cpp_dir *p, int chain) { if (tails[chain]) tails[chain]->next = p; else heads[chain] = p; tails[chain] = p; } /* Add PATH to the include chain CHAIN. PATH must be malloc-ed and NUL-terminated. */ void add_path (char *path, int chain, int cxx_aware, bool user_supplied_p) { cpp_dir *p; #if defined (HAVE_DOS_BASED_FILE_SYSTEM) /* Convert all backslashes to slashes. The native CRT stat() function does not recognize a directory that ends in a backslash (unless it is a drive root dir, such "c:\"). Forward slashes, trailing or otherwise, cause no problems for stat(). */ char* c; for (c = path; *c; c++) if (*c == '\\') *c = '/'; #endif p = XNEW (cpp_dir); p->next = NULL; p->name = path; if (chain == SYSTEM || chain == AFTER) p->sysp = 1 + !cxx_aware; else p->sysp = 0; p->construct = 0; p->user_supplied_p = user_supplied_p; add_cpp_dir_path (p, chain); } /* Exported function to handle include chain merging, duplicate removal, and registration with cpplib. */ void register_include_chains (cpp_reader *pfile, const char *sysroot, const char *iprefix, const char *imultilib, int stdinc, int cxx_stdinc, int verbose) { static const char *const lang_env_vars[] = { "C_INCLUDE_PATH", "CPLUS_INCLUDE_PATH", "OBJC_INCLUDE_PATH", "OBJCPLUS_INCLUDE_PATH" }; cpp_options *cpp_opts = cpp_get_options (pfile); size_t idx = (cpp_opts->objc ? 2: 0); if (cpp_opts->cplusplus) idx++; else cxx_stdinc = false; /* CPATH and language-dependent environment variables may add to the include chain. */ add_env_var_paths ("CPATH", BRACKET); add_env_var_paths (lang_env_vars[idx], SYSTEM); target_c_incpath.extra_pre_includes (sysroot, iprefix, stdinc); /* Finally chain on the standard directories. */ if (stdinc) add_standard_paths (sysroot, iprefix, imultilib, cxx_stdinc); target_c_incpath.extra_includes (sysroot, iprefix, stdinc); merge_include_chains (pfile, verbose); cpp_set_include_chains (pfile, heads[QUOTE], heads[BRACKET], /* BEGIN GCC-XML MODIFICATIONS (2007/10/31 15:07:01) */ heads[WRAPPER], /* END GCC-XML MODIFICATIONS (2007/10/31 15:07:01) */ quote_ignores_source_dir); } #if !(defined TARGET_EXTRA_INCLUDES) || !(defined TARGET_EXTRA_PRE_INCLUDES) static void hook_void_charptr_charptr_int (const char *sysroot ATTRIBUTE_UNUSED, const char *iprefix ATTRIBUTE_UNUSED, int stdinc ATTRIBUTE_UNUSED) { } #endif #ifndef TARGET_EXTRA_INCLUDES #define TARGET_EXTRA_INCLUDES hook_void_charptr_charptr_int #endif #ifndef TARGET_EXTRA_PRE_INCLUDES #define TARGET_EXTRA_PRE_INCLUDES hook_void_charptr_charptr_int #endif struct target_c_incpath_s target_c_incpath = { TARGET_EXTRA_PRE_INCLUDES, TARGET_EXTRA_INCLUDES };