The warning is misleading or at least, confusing. It doesn't mean variables are un-initialised - it means that values are undefined. And while each un-initialized variable contains an undefined value, the reverse isn't true.

    my $foo = undef;  # Variable is initialized.
    print $foo;
    __END__
    Use of uninitialized value in print
[download]

Your request is also unfeasable. Sure, it theory Perl could check that whenever you use my it's on the LHS of an assignment. Beside that it would flag code that has run without warnings for many years, it also won't do you any good. For instance, while:

    my @foo = qw /bar baz quux/;
[download]

initialized $foo[0], $foo[1] and $foo[2], it still means that $foo[3], $foo[4], $foo[5], ..., etc are uninitialized.

---

---

• Are you posting in the right place? Check out Where do I post X? to know for sure.
• Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:

  <code> <a> <b> <big> <blockquote> <br /> <dd> <dl> <dt> <em> <font> <h1> <h2> <h3> <h4> <h5> <h6> <hr /> <i> <li> <nbsp> <ol> <p> <small> <strike> <strong> <sub> <sup> <table> <td> <th> <tr> <tt> <u> <ul>

• Snippets of code should be wrapped in <code> tags not <pre> tags. In fact, <pre> tags should generally be avoided. If they must be used, extreme care should be taken to ensure that their contents do not have long lines (<70 chars), in order to prevent horizontal scrolling (and possible janitor intervention).
• Want more info? How to link or How to display code and escape characters are good places to start.