source: trunk/essentials/dev-lang/perl/Porting/config_h.pl@ 3299

#!/usr/bin/perl

# This script reorders config_h.SH after metaconfig
# Changing metaconfig is too complicated
#
# Copyright (C) 2005-2005 by H.Merijn Brand (m)'05 [25-05-2005]
#
# You may distribute under the terms of either the GNU General Public
# License or the Artistic License, as specified in the README file.

use strict;
use warnings;

my ($cSH, $ch, @ch, %ch) = ("config_h.SH");
open $ch, "<$cSH" or die "Cannot open $cSH: $!\n";
{   local $/ = "\n\n";
    @ch = <$ch>;
    close  $ch;
    }

sub ch_index ()
{
    %ch = ();
    foreach my $ch (0 .. $#ch) {
        while ($ch[$ch] =~ m{^/\* ([A-Z]\w+)}gm) {
            $ch{$1} = $ch;
            }
        }
    } # ch_index

my %dep = (
    # This symbol must be defined BEFORE ...
    BYTEORDER           => [ qw( UVSIZE                         ) ],
    LONGSIZE            => [ qw( BYTEORDER                      ) ],
    MULTIARCH           => [ qw( BYTEORDER MEM_ALIGNBYTES       ) ],
    USE_CROSS_COMPILE   => [ qw( BYTEORDER MEM_ALIGNBYTES       ) ],
    HAS_QUAD            => [ qw( I64TYPE                        ) ],
    HAS_GETGROUPS       => [ qw( Groups_t                       ) ],
    HAS_SETGROUPS       => [ qw( Groups_t                       ) ],
    );

my $changed;
do {
    $changed = 0;
    foreach my $sym (keys %dep) {
        ch_index;
        foreach my $dep (@{$dep{$sym}}) {
            print STDERR "Check if $sym\t($ch{$sym}) precedes $dep\t($ch{$dep})\n";
            $ch{$sym} < $ch{$dep} and next;
            my $ch = splice @ch, $ch{$sym}, 1;
            splice @ch, $ch{$dep}, 0, $ch;
            $changed++;
            ch_index;
            }
        }
    } while ($changed);

open  $ch, "> $cSH" or die "Cannot write $cSH: $!\n";
print $ch @ch;
close $ch;