use lib current directory

viradan has asked for the wisdom of the Perl Monks concerning the following question:

Replies are listed 'Best First'.
Re: use lib current directory by kcott (Archbishop) on Feb 25, 2014 at 09:15 UTC
G'day viradan, Welcome to the monastery. Check `perl -V` on both OSes. I'm reasonably certain that `'.'` has been included in `@INC` by default on all Perl versions and OSes that I've used; however, I rarely put modules in the current directory so I've had little reason to check this. On my completely different version and platform (`v5.18.1 built for darwin-thread-multi-2level`), I see this: `$ perl -V ... @INC: /Users/ken/local/lib/perl /Users/ken/perl5/perlbrew/perls/perl-5.18.1t/lib/site_perl/5.18.1/ +darwin-thread-multi-2level /Users/ken/perl5/perlbrew/perls/perl-5.18.1t/lib/site_perl/5.18.1 /Users/ken/perl5/perlbrew/perls/perl-5.18.1t/lib/5.18.1/darwin-thr +ead-multi-2level /Users/ken/perl5/perlbrew/perls/perl-5.18.1t/lib/5.18.1 .` [download] Update: Just for completeness, and in case you were wondering where it came from, the first path in my `@INC` is from: `$ echo $PERL5LIB /Users/ken/local/lib/perl` [download] -- Ken	[reply] [d/l] [select]
Re^2: use lib current directory by viradan (Novice) on Feb 25, 2014 at 10:04 UTC
hi Ken, thx for hint, however all three rhel versions contain `... Compiled at Aug 7 2013 06:31:19 @INC: /usr/local/lib64/perl5 /usr/local/share/perl5 /usr/lib64/perl5/vendor_perl /usr/share/perl5/vendor_perl /usr/lib64/perl5 /usr/share/perl5 .` [download] with different compilation time ... kind of strange to me so far didn't find anything suspicious in rhel release notes	[reply] [d/l]
Re^3: use lib current directory by syphilis (Archbishop) on Feb 25, 2014 at 10:49 UTC
If adding `use lib ".";` fixes a problem && "." is included in @INC, then my first thought is that something removes "." from @INC. I would think that this removal would have happened inside the perl code, and at compile time - eg inside a BEGIN{} block. So that would be the fist place to look. If you have a script in which you have included `use lib ".";`, try inserting immediately before that line: `BEGIN {print "$_\n" for @INC;};` [download] If that shows you that "." was present during the execution of the BEGIN{} block, then the inclusion of `use lib ".";` would do nothing more than put "." at the beginning of @INC. That is, instead of having "." last in the @INC search path, it is now first. Could that be the key to the success with `use lib ".";` in your case ? (There are perhaps other scenarios that I've overlooked.) Cheers, Rob	[reply] [d/l] [select]
Re^4: use lib current directory by Anonymous Monk on Feb 25, 2014 at 11:23 UTC
Re^4: use lib current directory by viradan (Novice) on Feb 25, 2014 at 14:10 UTC
Re^5: use lib current directory by syphilis (Archbishop) on Feb 25, 2014 at 22:54 UTC
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Re^3: use lib current directory by kcott (Archbishop) on Feb 25, 2014 at 10:39 UTC
In that case, the issue may be the location of (potentially multiple copies of) modules and the order in which `perl` is finding them from `@INC`. In the following, note how `'.'` moves from `$INC[-1]` to `$INC[0]` (compare with my earlier `perl -V` output): `#!/usr/bin/env perl -l use strict; use warnings; BEGIN { print "BEFORE use lib: @INC[0, -1]" } use lib '.'; BEGIN { print "AFTER use lib: @INC[0, -1]" }` [download] Output: `BEFORE use lib: /Users/ken/local/lib/perl . AFTER use lib: . /Users/ken/perl5/perlbrew/perls/perl-5.18.1t/lib/5.1 +8.1` [download] -- Ken	[reply] [d/l] [select]