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POIs it possible to trick Perl to use a variable %INC and still keep the global %INC untouched?
 

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  1. POIs it possible to trick Perl to use a variable %INC and still keep the global %INC untouched?
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    <p>I have just found a script we are using which has a sub that says <code>my %INC</code> in it, where it stores some values about incentives, thus <code>%INC</code>. This never seemed to be a problem, or no-one ever noticed. For me it produced 20 screens of redefine warnings, because <code>%INC</code>, holding all the file names Perl has <code>do</code>ne, <code>require</code>d or <code>use</code>d, was pretty large, and now is <code>('stuff' =&gt; 123)</code>.</p> <p>Do I really have to go and rename every single reference to this in the sub, or is there another way to make Perl forgive this ... ?</p> <hr> <p>Here's a part of the output of:</p> <pre><code>print Dumper \%INC; # I added this line my %INC; print Dumper \%INC; # I added this line exit; # I added this line </code></pre> <p>Output:</p> <pre><code> [...] 'SqlConnect.pm' =&gt; 'lib1/SqlConnect.pm', 'Lib/RateRequest.pm' =&gt; 'Lib/RateRequest.pm' }; $VAR1 = {}; [Fri Jun 29 16:09:13 2012] live_batch_test.pl: Subroutine export_fail redefined at /usr/lib/perl5/5.14.2/Carp.pm line 43. [Fri Jun 29 16:09:13 2012] live_batch_test.pl: Subroutine _cgc redefined at /usr/lib/perl5/5.14.2/Carp.pm line 45. [Fri Jun 29 16:09:13 2012] live_batch_test.pl: Subroutine longmess redefined at /usr/lib/perl5/5.14.2/Carp.pm line 51. [Fri Jun 29 16:09:13 2012] live_batch_test.pl: Subroutine shortmess redefined at /usr/lib/perl5/5.14.2/Carp.pm line 71. [...] (Snipped like 20 screens of redefine warnings) </code></pre> <p>The warnings only show if I create an object of one of my classes (which happens to contain <code>SOAP::WSDL</code> so it has a lot of stuff in it). I'm not sure why those are redefine warnings. If <code>%INC</code> is empty, how can it know stuff is being redefined?</p> <hr> <p><strong>Update:</strong></p> <p>It seems you actually <strong>can</strong> create a lexical <code>my %INC</code>.</p> <pre><code>use strict; use warnings; use Data::Dumper; print Dumper \%INC; { my %INC = ('asdf' =&gt; 'asdf'); print Dumper \%INC; } print Dumper \%INC; </code></pre> <p>Produces (snipped):</p> <pre><code> 'feature.pm' =&gt; 'C:/Perl/lib/feature.pm' }; $VAR1 = { 'asdf' =&gt; 'asdf' }; $VAR1 = { 'warnings/register.pm' =&gt; 'C:/Perl/lib/warnings/register.pm', </code></pre> <p>The problem in my case does not seem to be the <code>my %INC</code>, but rather the <code>%INC = &amp;sub_that_has_my_percent_INC_and_returns_it()</code> in the script that I actually have to <code>require</code>. Now that, in turn, also has <code>use vars qw(%INC)</code>. Replacing it... well, I'm not sure what that is going to break.</p>
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    1. COI'm going to have a fun chat with the guy who built this...
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    2. CODo you mean `@INC`?
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    3. COlocal %INC; would have made more sense. I guess you can't change it now without causing unintended consequences, right?
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