Beefy Boxes and Bandwidth Generously Provided by pair Networks
go ahead... be a heretic

comment on

( #3333=superdoc: print w/replies, xml ) Need Help??
I came across a strange side effect while using File::Spec::tmpdir. $ENV{TMPDIR} is being created and set to undef, as though it is being autovivified. I pulled the pieces out of File::Spec::Win32 and ::Unix and got it down to this example:
#!perl -w use strict; use warnings; sub see_args { printf "I see args '%s'\n", join("', '",@_); return; } warn sprintf "In test, at start (1): TMPDIR '%s'\n", ! exists $ENV{TMPDIR} ? '<absent>' : ! defined $ENV{TMPDIR} ? + '<undef>' : $ENV{TMPDIR}; see_args( @ENV{qw(TMPDIR TEMP TMP)} ); warn sprintf "In test, at end (2): TMPDIR '%s'\n", ! exists $ENV{TMPDIR} ? '<absent>' : ! defined $ENV{TMPDIR} ? + '<undef>' : $ENV{TMPDIR};
produces output:
In test, at start (1): TMPDIR '<absent>' Use of uninitialized value in join or string at line 7. I see args '', 'C:\DOCUME~1\ADMINI~1\LOCALS~1\Temp', 'C:\DOCUME~1\ADMI +NI~1\LOCALS~1\Temp' In test, at end (2): TMPDIR '<undef>'

Just to be sure it wasn't the _use_ of the subroutine arguments, I commented out the printf, and got output

In test, at start (1): TMPDIR '<absent>' In test, at end (2): TMPDIR '<undef>'
so it is the call itself doing the nasty thing to my mind. Can someone make this make sense to me?

In reply to Autovivification sucking the life out of me by shenme

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, 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, 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.
  • Log In?

    What's my password?
    Create A New User
    and the web crawler heard nothing...

    How do I use this? | Other CB clients
    Other Users?
    Others perusing the Monastery: (3)
    As of 2021-04-15 01:53 GMT
    Find Nodes?
      Voting Booth?

      No recent polls found