Re^2: Know a perl's -I flag from perl?

Hello,

You are very right Anoymous.

And I can accept the point of view that perl interpreter flags should not be controlled from perl source.

Actually I can imagine that there can be another kind of perl interpreter that can have the different flags an/or not to be a binary at all (e. g., a binary library) and it may not accept namely the -I flag.

But I think the task is quite straightforward to take those condireations not as seriously as I can.

It's all just about to run the binary from make test or prove.

I believe it's not a problem for you to suggest another way to supply the libraries path for perl binary to run from tests, if you have any.

Thank you.

Peter

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Re^3: Know a perl's -I flag from perl? by Anonymous Monk on Dec 16, 2012 at 00:21 UTC
The purpose of -I is to populate @INC You don't need the original -I flags, you have @INC	[reply]
Re^4: Know a perl's -I flag from perl? by tobyink (Canon) on Dec 19, 2012 at 14:58 UTC
But `@INC` can be altered at run time. Consider that your default `@INC` is just: `/eg/lib` [download] You run `perl -I/eg/custom myscript.pl`. Now `@INC` is:</c> `/eg/custom /eg/lib` [download] Imagine that myscript.pl contains `use mylibs` which loads `/eg/custom/mylibs.pm`. This module itself tinkers with `@INC` at run-time, adding another path at the front. `/corporate/lib /eg/custom /eg/lib` [download] Now you want to launch another Perl process via `system()`, so what do you do? Something like: `my @incs = map { "-I$_" } @INC; system($^X, @incs, 'other-script.pl');` [download] So when the other script starts, it will start with this in `@INC`: `/corporate/lib /eg/custom /eg/lib` [download] Now let's imagine that other-script.pl also does `use mylibs`. Rather than that loading `/eg/custom/mylibs.pm`, it might now load `/corporate/lib/mylibs.pm`, which is perhaps an older version of the `mylibs` package which behaves differently to how we wanted. Granted this is a rare situation, but there do exist packages along these lines; packages that exist entirely to manipulate `@INC`, such as local::lib. Combining these libraries with `system($^X)` can get you into a merry little pickle. `perl -E'sub Monkey::do{say$_,for@_,do{($monkey=[caller(0)]->[3])=~s{::}{ }and$monkey}}"Monkey say"->Monkey::do'`	[reply] [d/l] [select]
Re^5: Know a perl's -I flag from perl? by Anonymous Monk on Dec 21, 2012 at 03:59 UTC
... So before your script diddles @INC, preserve it? `use constant FINC => [ @INC ]; use lib ...;` [download] And if you're worried about that, then worry about PERLLIB/PERL5LIB/PERL5OPTS...	[reply] [d/l]

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