[tpm] how to conditional compile

[arocker at vex.net]

How about using references?

#!/usr/bin/perl

use strict;
use warnings;

my $name;

if (@ARGV) {
    $name   = \suba();
}
else {
    $name   = \subb();
}
my $x   =   $name;

sub suba    {
    print "I'm a Mac\n";
}

sub subb    {
    print "I'm a PC\n";
}
#   subs Ends

It should be obvious how to test this.
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