Well, after reading Tom Christiansen's thoughtful rant on prototypes, I'm inclined to agree with him. I fixed this problem, but the experience is worth telling. The real problem was not in the original code, but in a line in the GetSSNameFromFile subroutine. Near the end was the following line of code: 
      GetSSNameFromFile( $s_ParentFileName, 
                         $$rs_OutputFile, 
                         $$rs_RecurseLabel );

[download]
You see, this is a recursive function. The scalar $$rs_RecurseLabel is essentially a count of our current recurse depth. That explains why I'm incrementing it when I first enter into the function. But, the real problem I believe was caused by this call. I don't know exactly why, however. I simply switched from the implicit reference creation by the prototype to not using prototypes. I handle the references myself using hard references. This seems to fix the problem. One nicity of this approach is that the above code now becomes: 
      GetSSNameFromFile( $s_ParentFileName, 
                         $rs_OutputFile, 
                         $rs_RecurseLabel );

[download]
I just pass the hard reference.

Thanks for the replies,

Dave

In reply to Re: References, Prototypes, and read-only values by dkusters
in thread References, Prototypes, and read-only values by dkusters

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.