ActivePerl's documentation (the HTML docs, both in PPM packages and that comes with) is generated by ActiveState::DocTools (not on CPAN), by calling Pod::Html::pod2html on all pods that Pod::Find::pod_find (where the output file does not yet exist or is older then the input file), with the args...

        my @args = (
            "--htmldir=$dir",
            "--htmlroot=$back",
            "--podroot=.",
            "--podpath=$podpath",
            "--libpods=perlfunc:perlguts:perlvar:perlrun:perlopt",
            "--header", 
            "--infile=$infile", 
            "--outfile=$outfile", 
            "--css=$back/$css", 
            "--quiet",
            );
[download]

(where all vars are pretty much what you expect them to be.)

(In other words, it only makes one pass.)

---

Warning: Unless otherwise stated, code is untested. Do not use without understanding. Code is posted in the hopes it is useful, but without warranty. All copyrights are relinquished into the public domain unless otherwise stated. I am not an angel. I am capable of error, and err on a fairly regular basis. If I made a mistake, please let me know (such as by replying to this node).