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#if __STDC_HOSTED__
# if defined __cplusplus && __cplusplus >= 201103L
# undef __STDC_LIMIT_MACROS
# define __STDC_LIMIT_MACROS
# undef __STDC_CONSTANT_MACROS
# define __STDC_CONSTANT_MACROS
# endif
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&=LV[(aamJq@bѿ ? ## Copyright (C) 2003-2013 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, see .
package Automake::Variable;
use 5.006;
use strict;
use Carp;
use Automake::Channels;
use Automake::ChannelDefs;
use Automake::Configure_ac;
use Automake::Item;
use Automake::VarDef;
use Automake::Condition qw (TRUE FALSE);
use Automake::DisjConditions;
use Automake::General 'uniq';
use Automake::Wrap 'makefile_wrap';
require Exporter;
use vars '@ISA', '@EXPORT', '@EXPORT_OK';
@ISA = qw/Automake::Item Exporter/;
@EXPORT = qw (err_var msg_var msg_cond_var reject_var
var rvar vardef rvardef
variables
scan_variable_expansions check_variable_expansions
variable_delete
variables_dump
set_seen
require_variables
variable_value
output_variables
transform_variable_recursively);
=head1 NAME
Automake::Variable - support for variable definitions
=head1 SYNOPSIS
use Automake::Variable;
use Automake::VarDef;
# Defining a variable.
Automake::Variable::define($varname, $owner, $type,
$cond, $value, $comment,
$where, $pretty)
# Looking up a variable.
my $var = var $varname;
if ($var)
{
...
}
# Looking up a variable that is assumed to exist.
my $var = rvar $varname;
# The list of conditions where $var has been defined.
# ($var->conditions is an Automake::DisjConditions,
# $var->conditions->conds is a list of Automake::Condition.)
my @conds = $var->conditions->conds
# Access to the definition in Condition $cond.
# $def is an Automake::VarDef.
my $def = $var->def ($cond);
if ($def)
{
...
}
# When the conditional definition is assumed to exist, use
my $def = $var->rdef ($cond);
=head1 DESCRIPTION
This package provides support for Makefile variable definitions.
An C is a variable name associated to possibly
many conditional definitions. These definitions are instances
of C.
Therefore obtaining the value of a variable under a given
condition involves two lookups. One to look up the variable,
and one to look up the conditional definition:
my $var = var $name;
if ($var)
{
my $def = $var->def ($cond);
if ($def)
{
return $def->value;
}
...
}
...
When it is known that the variable and the definition
being looked up exist, the above can be simplified to
return var ($name)->def ($cond)->value; # Do not write this.
but is better written