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diff --git a/gcc/line-map.h b/gcc/line-map.h
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+/* Map logical line numbers to (source file, line number) pairs.
+   Copyright (C) 2001
+   Free Software Foundation, Inc.
+
+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, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+
+ In other words, you are welcome to use, share and improve this program.
+ You are forbidden to forbid anyone else to use, share and improve
+ what you give them.   Help stamp out software-hoarding!  */
+
+#ifndef GCC_LINE_MAP_H
+#define GCC_LINE_MAP_H
+
+/* The logical line FROM_LINE maps to physical source file TO_FILE at
+   line TO_LINE, and subsequently one-to-one until the next line_map
+   structure in the set.  */
+struct line_map
+{
+  const char *to_file;
+  unsigned int to_line;
+  unsigned int from_line;
+  int included_from;
+};
+
+/* Contains a sequence of chronological line_map structures.  */
+struct line_maps
+{
+  struct line_map *maps;
+  unsigned int allocated;
+  unsigned int used;
+};
+
+/* Reason for adding a line change with add_line_map ().  */
+enum lc_reason {LC_ENTER = 0, LC_LEAVE, LC_RENAME};
+
+/* Initialize a line map set.  */
+extern void init_line_maps
+  PARAMS ((struct line_maps *));
+
+/* Free a line map set.  */
+extern void free_line_maps
+  PARAMS ((struct line_maps *));
+
+/* Add a mapping of logical source line to physical source file and
+   line number.  Ther text pointed to by TO_FILE must have a lifetime
+   at least as long as the final call to lookup_line ().
+
+   FROM_LINE should be monotonic increasing across calls to this
+   function.  */
+extern struct line_map *add_line_map
+  PARAMS ((struct line_maps *, enum lc_reason,
+	   unsigned int from_line, const char *to_file, unsigned int to_line));
+
+/* Given a logical line, returns the map from which the corresponding
+   (source file, line) pair can be deduced.  */
+extern struct line_map *lookup_line
+  PARAMS ((struct line_maps *, unsigned int));
+
+/* Converts a map and logical line to source line.  */
+#define SOURCE_LINE(MAP, LINE) ((LINE) + (MAP)->to_line - (MAP)->from_line)
+
+/* Returns the last source line within a map.  This is the (last) line
+   of the #include, or other directive, that caused a map change.  */
+#define LAST_SOURCE_LINE(MAP) SOURCE_LINE (MAP, (MAP)[1].from_line - 1)
+
+#define MAIN_FILE_P(MAP) ((MAP)->included_from < 0)
+
+#endif /* !GCC_LINE_MAP_H  */