I'm working on a piece of code which needs Perl Tk, which may or may not be installed. It behaves differently depending on whether I use require and import, or use:

#! /usr/bin/perl -w

use strict;

eval {
  require Tk;
  import Tk;
};

die "Can't load Tk" if $@;

MainWindow->new->Button(-text => "Cancel",
              -command => sub {exit 1}
             )->pack(-side => 'left', -expand => 1);
Tk::MainLoop();
[download]

Assuming that Tk is available, this produces a simple exit button. On my mandrake 9.1 box at home (perl 5.8.0) this works fine, and silently. On my solaris box at work (perl 5.6.1), it produces a segmentation fault at exit. However, if I change to "use" instead:

#! /usr/bin/perl -w

use strict;

use Tk;

MainWindow->new->Button(-text => "Cancel",
              -command => sub {exit 1}
             )->pack(-side => 'left', -expand => 1);
Tk::MainLoop();
[download]

Then it behaves the same on both machines, generates the text:

Callback called exit.
Callback called exit.
[download]

on stderr, and no segmentation fault occurs. Why? What's different? What am I doing wrong? (Hopefully, if I can make require and import behave like use, I can also get around the segmentation fault.)

--
Tommy
Too stupid to live.
Too stubborn to die.

edited: Thu Jun 12 12:13:52 2003 by jeffa - title change (was: Use != Require & Import?)

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