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100 lines
3.5 KiB
C
100 lines
3.5 KiB
C
/* Definitions for using variables in GNU Make.
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Copyright (C) 1988, 1989, 1990, 1991, 1992 Free Software Foundation, Inc.
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This file is part of GNU Make.
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GNU Make is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Make is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Make; see the file COPYING. If not, write to
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the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
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/* Codes in a variable definition saying where the definition came from.
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Increasing numeric values signify less-overridable definitions. */
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enum variable_origin
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{
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o_default, /* Variable from the default set. */
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o_env, /* Variable from environment. */
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o_file, /* Variable given in a makefile. */
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o_env_override, /* Variable from environment, if -e. */
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o_command, /* Variable given by user. */
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o_override, /* Variable from an `override' directive. */
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o_automatic, /* Automatic variable -- cannot be set. */
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o_invalid /* Core dump time. */
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};
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/* Structure that represents one variable definition.
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Each bucket of the hash table is a chain of these,
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chained through `next'. */
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struct variable
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{
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struct variable *next; /* Link in the chain. */
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char *name; /* Variable name. */
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char *value; /* Variable value. */
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enum variable_origin
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origin ENUM_BITFIELD (3); /* Variable origin. */
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unsigned int recursive:1; /* Gets recursively re-evaluated. */
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unsigned int expanding:1; /* Nonzero if currently being expanded. */
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enum
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{
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v_export, /* Export this variable. */
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v_noexport, /* Don't export this variable. */
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v_ifset, /* Export it if it has a non-default value. */
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v_default /* Decide in target_environment. */
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} export ENUM_BITFIELD (2);
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};
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/* Structure that represents a variable set. */
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struct variable_set
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{
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struct variable **table; /* Hash table of variables. */
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unsigned int buckets; /* Number of hash buckets in `table'. */
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};
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/* Structure that represents a list of variable sets. */
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struct variable_set_list
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{
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struct variable_set_list *next; /* Link in the chain. */
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struct variable_set *set; /* Variable set. */
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};
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extern struct variable_set_list *current_variable_set_list;
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extern void push_new_variable_scope (), pop_variable_scope ();
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extern int handle_function ();
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extern char *variable_buffer_output ();
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extern char *variable_expand (), *variable_expand_for_file ();
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extern char *allocated_variable_expand_for_file ();
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#define allocated_variable_expand(line) \
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allocated_variable_expand_for_file (line, (struct file *) 0)
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extern char *expand_argument ();
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extern void define_automatic_variables ();
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extern void initialize_file_variables ();
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extern void print_file_variables ();
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extern void merge_variable_set_lists ();
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extern struct variable *try_variable_definition ();
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extern struct variable *lookup_variable (), *define_variable ();
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extern struct variable *define_variable_for_file ();
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extern int pattern_matches ();
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extern char *subst_expand (), *patsubst_expand (), *recursively_expand ();
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extern char **target_environment ();
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extern int export_all_variables;
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