PERL5OPT and -M

perl5ever has asked for the wisdom of the Perl Monks concerning the following question:

I have PERL5OPT set to -Mlib=/my/personal/lib, and I am encountering this strange behavior. The module Devel::LeakTrace::Fast is located under /my/personal/lib.

$ perl -e 'print join("\n", @INC)'
... lists /my/personal/lib among others

$ perl -MDevel::LeakTrace::Fast -e 1
Can't locate Devel/LeakTrace/Fast.pm in @INC (@INC contains: ... )
NOTE: /my/personal/lib NOT listed here

$ perl $PERL5OPT -MDevel::LeakTrace::Fast -e 1
(works no problems)
[download]

The documentation says that PERL5OPT options are taken as if they appear on every perl command line. However, it looks as if those options are appended to the end of the command line. Is that what's going on?

Is there a way to get PERL5OPT options to appear in front of the supplied command line options?

Comment on PERL5OPT and -M Select or Download Code

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Re: PERL5OPT and -M by moritz (Cardinal) on Mar 10, 2009 at 21:15 UTC
Just use `PERL5LIB=/my/personal/lib` instead, it's exactly made for the situation at hand, and a bit cleaner at that. Update: see perlrun for details.	[reply] [d/l]
Re^2: PERL5OPT and -M by perl5ever (Pilgrim) on Mar 11, 2009 at 03:24 UTC
Yes, `PERL5LIB` is what I want - thanks!	[reply] [d/l]
Re: PERL5OPT and -M by xdg (Monsignor) on Mar 11, 2009 at 01:44 UTC
If you set `PERL5OPT` to `-I/my/personal/lib` that should take effect before any "-M" options are processed. Or use `PERL5LIB` (unless you need to run code in taint mode). -xdg Code written by xdg and posted on PerlMonks is public domain. It is provided as is with no warranties, express or implied, of any kind. Posted code may not have been tested. Use of posted code is at your own risk.	[reply] [d/l] [select]