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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 ();
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