1 /* Copyright (C) 1988, 1989, 1990, 1991, 1992 Free Software Foundation, Inc.
2 This file is part of GNU Make.
4 GNU Make is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2, or (at your option)
9 GNU Make is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with GNU Make; see the file COPYING. If not, write to
16 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
18 /* Codes in a variable definition saying where the definition came from.
19 Increasing numeric values signify less-overridable definitions. */
22 o_default
, /* Variable from the default set. */
23 o_env
, /* Variable from environment. */
24 o_file
, /* Variable given in a makefile. */
25 o_env_override
, /* Variable from environment, if -e. */
26 o_command
, /* Variable given by user. */
27 o_override
, /* Variable from an `override' directive. */
28 o_automatic
, /* Automatic variable -- cannot be set. */
29 o_invalid
/* Core dump time. */
32 /* Structure that represents one variable definition.
33 Each bucket of the hash table is a chain of these,
34 chained through `next'. */
38 struct variable
*next
; /* Link in the chain. */
39 char *name
; /* Variable name. */
40 char *value
; /* Variable value. */
42 origin
ENUM_BITFIELD (3); /* Variable origin. */
43 unsigned int recursive
:1; /* Gets recursively re-evaluated. */
44 unsigned int expanding
:1; /* Nonzero if currently being expanded. */
47 v_export
, /* Export this variable. */
48 v_noexport
, /* Don't export this variable. */
49 v_ifset
, /* Export it if it has a non-default value. */
50 v_default
/* Decide in target_environment. */
51 } export
ENUM_BITFIELD (2);
54 /* Structure that represents a variable set. */
58 struct variable
**table
; /* Hash table of variables. */
59 unsigned int buckets
; /* Number of hash buckets in `table'. */
62 /* Structure that represents a list of variable sets. */
64 struct variable_set_list
66 struct variable_set_list
*next
; /* Link in the chain. */
67 struct variable_set
*set
; /* Variable set. */
70 extern struct variable_set_list
*current_variable_set_list
;
73 extern void push_new_variable_scope (), pop_variable_scope ();
75 extern int handle_function ();
77 extern char *variable_buffer_output ();
78 extern char *variable_expand (), *variable_expand_for_file ();
79 extern char *allocated_variable_expand_for_file ();
80 #define allocated_variable_expand(line) \
81 allocated_variable_expand_for_file (line, (struct file *) 0)
82 extern char *expand_argument ();
84 extern void define_automatic_variables ();
85 extern void initialize_file_variables ();
86 extern void print_file_variables ();
88 extern void merge_variable_set_lists ();
90 extern struct variable
*try_variable_definition ();
92 extern struct variable
*lookup_variable (), *define_variable ();
93 extern struct variable
*define_variable_for_file ();
95 extern int pattern_matches ();
96 extern char *subst_expand (), *patsubst_expand (), *recursively_expand ();
98 extern char **target_environment ();
99 extern int export_all_variables
;