I'd use something like this:
use strict;
use warnings 'all';
my ($first, $second) = qw /first second/;
open my $f1h => $first or die "open $first: $!\n";
open my $f2h => $second or die "open $second: $!\n";
my %first = reverse map {/(\d+)\s+\w+\s+\d+\s+\d+:\d+\s+(.*)/}
grep {/\.o$/} <$f1h>;
my %second = reverse map {/(\d+)\s+\w+\s+\d+\s+\d+:\d+\s+(.*)/}
grep {/\.o$/} <$f2h>;
my ($file, $size);
print "$file: $size <-> $second{$file}\n" while +($file, $size) = each
+ %first;
Abigail
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