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# Copyright (C) 2018 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
# of the License, 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 <http://www.gnu.org/licenses/>.
package Automake::ConfVars;
use 5.006;
use strict;
use Automake::ChannelDefs;
use Automake::Channels;
use Automake::Condition qw (TRUE FALSE);
use Automake::Config;
use Automake::File;
use Automake::Global;
use Automake::Location;
use Automake::Utils;
use Automake::VarDef;
use Automake::Variable;
use Exporter 'import';
use vars qw (@EXPORT);
@EXPORT = qw (%configure_vars %ignored_configure_vars $output_vars
&define_standard_variables);
# Hash table of discovered configure substitutions. Keys are names,
# values are 'FILE:LINE' strings which are used by error message
# generation.
our %configure_vars = ();
# Ignored configure substitutions (i.e., variables not to be output in
# Makefile.in)
our %ignored_configure_vars = ();
# This variable is used when generating each Makefile.in. It holds the
# Makefile.in vars until the file is ready to be printed
our $output_vars;
sub _define_configure_variable ($)
{
my ($var) = @_;
# Some variables we do not want to output. For instance it
# would be a bad idea to output `U = @U@` when `@U@` can be
# substituted as `\`.
my $pretty = exists $ignored_configure_vars{$var} ? VAR_SILENT : VAR_ASIS;
Automake::Variable::define ($var, VAR_CONFIGURE, '', TRUE, subst ($var),
'', $configure_vars{$var}, $pretty);
}
# A helper for read_main_am_file which initializes configure variables
# and variables from header-vars.am.
sub define_standard_variables ()
{
my $saved_output_vars = $output_vars;
my $filename = "$libdir/am/header-vars.am";
my $preprocessed_file = preprocess_file ($filename);
my @paragraphs = make_paragraphs ($preprocessed_file);
my ($comments, undef, $rules) =
file_contents_internal (1, $filename, new Automake::Location,
\@paragraphs);
foreach my $var (sort keys %configure_vars)
{
_define_configure_variable ($var);
}
$output_vars .= $comments . $rules;
}
1;
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