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+/* Copyright (C) 1988, 1989, 1990, 1991 Free Software Foundation, Inc.
+This file is part of GNU Make.
+
+GNU Make 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.
+
+GNU Make 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 GNU Make; see the file COPYING.  If not, write to
+the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+/* Codes in a variable definition saying where the definition came from.
+   Increasing numeric values signify less-overridable definitions.  */
+enum variable_origin
+  {
+    o_default,		/* Variable from the default set.  */
+    o_env,		/* Variable from environment.  */
+    o_file,		/* Variable given in a makefile.  */
+    o_env_override,	/* Variable from environment, if -e.  */
+    o_command,		/* Variable given by user.  */
+    o_override, 	/* Variable from an `override' directive.  */
+    o_automatic,	/* Automatic variable -- cannot be set.  */
+    o_invalid		/* Core dump time.  */
+  };
+
+/* Structure that represents one variable definition.
+   Each bucket of the hash table is a chain of these,
+   chained through `next'.  */
+
+struct variable
+  {
+    struct variable *next;	/* Link in the chain.  */
+    char *name;			/* Variable name.  */
+    char *value;		/* Variable value.  */
+    enum variable_origin
+      origin ENUM_BITFIELD (3);	/* Variable origin.  */
+    unsigned int recursive:1;	/* Gets recursively re-evaluated.  */
+    unsigned int expanding:1;	/* Nonzero if currently being expanded.  */
+  };
+
+/* Structure that represents a variable set.  */
+
+struct variable_set
+  {
+    struct variable **table;	/* Hash table of variables.  */
+    unsigned int buckets;	/* Number of hash buckets in `table'.  */
+  };
+
+/* Structure that represents a list of variable sets.  */
+
+struct variable_set_list
+  {
+    struct variable_set_list *next;	/* Link in the chain.  */
+    struct variable_set *set;		/* Variable set.  */
+  };
+
+extern struct variable_set_list *current_variable_set_list;
+
+
+extern char *variable_buffer_output ();
+extern char *initialize_variable_output ();
+extern char *save_variable_output ();
+extern void restore_variable_output ();
+
+extern void push_new_variable_scope (), pop_variable_scope ();
+
+extern int handle_function ();
+
+extern char *variable_expand (), *allocated_variable_expand ();
+extern char *variable_expand_for_file ();
+extern char *allocated_variable_expand_for_file ();
+extern char *expand_argument ();
+
+extern void define_automatic_variables ();
+extern void initialize_file_variables ();
+extern void print_file_variables ();
+
+extern void merge_variable_set_lists ();
+
+extern int try_variable_definition ();
+
+extern struct variable *lookup_variable (), *define_variable ();
+extern struct variable *define_variable_for_file ();
+
+extern int pattern_matches ();
+extern char *subst_expand (), *patsubst_expand ();
+
+extern char **target_environment ();