request to add option to run syntax_ok() with global warnings

[fschlich]

Hi, I'm forwarding a request / wishlist bug received at https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=769970:

It would be nice if the syntax_ok() check could also enable (maybe
optionally) the perl global warnings, so that some of the problems
that only get detected with that, and not with «use warings» can be
spotted. Here's an example where this is relevant:

,--- compile-warn.pl ---

!/usr/bin/perl

use strict;
use warnings;
use POSIX qw(getcwd);
use Cwd;
my $cwd = getcwd();
1;
`---

,---
$ perl -c compile-warn.pl
compile-warn.pl syntax OK
$ perl -cw compile-warn.pl
Subroutine main::getcwd redefined at /usr/share/perl/5.20/Exporter.pm line 66.
at compile-warn.pl line 7.
compile-warn.pl syntax OK
`---

[ghost]

There is Test::Warnings that can look for the presence of warnings...