NAME

       Config::Perl::V - Structured data retrieval of perl -V output

SYNOPSIS

        use Config::Perl::V;

        my $local_config = Config::Perl::V::myconfig ();
        print $local_config->{config}{osname};

DESCRIPTION

   $conf = myconfig ()
       This function will collect the data described in "the hash structure" below, and return
       that as a hash reference. It optionally accepts an option to include more entries from
       %ENV. See environment below.

       Note that this will not work on uninstalled perls when called with
       "-I/path/to/uninstalled/perl/lib", but it works when that path is in $PERL5LIB or in
       $PERL5OPT, as paths passed using "-I" are not known when the "-V" information is
       collected.

   $conf = plv2hash ($text [, ...])
       Convert a sole 'perl -V' text block, or list of lines, to a complete myconfig hash.  All
       unknown entries are defaulted.

   $info = summary ([$conf])
       Return an arbitrary selection of the information. If no $conf is given, "myconfig ()" is
       used instead.

   $md5 = signature ([$conf])
       Return the MD5 of the info returned by "summary ()" without the "config_args" entry.

       If "Digest::MD5" is not available, it return a string with only 0's.

   The hash structure
       The returned hash consists of 4 parts:

       build
           This information is extracted from the second block that is emitted by "perl -V", and
           usually looks something like

            Characteristics of this binary (from libperl):
              Compile-time options: DEBUGGING USE_64_BIT_INT USE_LARGE_FILES
              Locally applied patches:
                    defined-or
                    MAINT24637
              Built under linux
              Compiled at Jun 13 2005 10:44:20
              @INC:
                /usr/lib/perl5/5.8.7/i686-linux-64int
                /usr/lib/perl5/5.8.7
                /usr/lib/perl5/site_perl/5.8.7/i686-linux-64int
                /usr/lib/perl5/site_perl/5.8.7
                /usr/lib/perl5/site_perl
                .

           or

            Characteristics of this binary (from libperl):
              Compile-time options: DEBUGGING MULTIPLICITY
                                    PERL_DONT_CREATE_GVSV PERL_IMPLICIT_CONTEXT
                                    PERL_MALLOC_WRAP PERL_TRACK_MEMPOOL
                                    PERL_USE_SAFE_PUTENV USE_ITHREADS
                                    USE_LARGE_FILES USE_PERLIO
                                    USE_REENTRANT_API
              Built under linux
              Compiled at Jan 28 2009 15:26:59

           This information is not available anywhere else, including %Config, but it is the
           information that is only known to the perl binary.

           The extracted information is stored in 5 entries in the "build" hash:

           osname
               This is most likely the same as $Config{osname}, and was the name known when perl
               was built. It might be different if perl was cross-compiled.

               The default for this field, if it cannot be extracted, is to copy $Config{osname}.
               The two may be differing in casing (OpenBSD vs openbsd).

           stamp
               This is the time string for which the perl binary was compiled. The default value
               is 0.

           options
               This is a hash with all the known defines as keys. The value is either 0, which
               means unknown or unset, or 1, which means defined.

           derived
               As some variables are reported by a different name in the output of "perl -V" than
               their actual name in %Config, I decided to leave the "config" entry as close to
               reality as possible, and put in the entries that might have been guessed by the
               printed output in a separate block.

           patches
               This is a list of optionally locally applied patches. Default is an empty list.

       environment
           By default this hash is only filled with the environment variables out of %ENV that
           start with "PERL", but you can pass the "env" option to myconfig to get more

            my $conf = Config::Perl::V::myconfig ({ env => qr/^ORACLE/ });
            my $conf = Config::Perl::V::myconfig ([ env => qr/^ORACLE/ ]);

       config
           This hash is filled with the variables that "perl -V" fills its report with, and it
           has the same variables that "Config::myconfig" returns from %Config.

       inc This is the list of default @INC.

REASONING

       This module was written to be able to return the configuration for the currently used perl
       as deeply as needed for the CPANTESTERS framework.  Up until now they used the output of
       myconfig as a single text blob, and so it was missing the vital binary characteristics of
       the running perl and the optional applied patches.

BUGS

       Please feedback what is wrong

TODO

        * Implement retrieval functions/methods
        * Documentation
        * Error checking
        * Tests

AUTHOR

       H.Merijn Brand <h.m.brand@xs4all.nl>

COPYRIGHT AND LICENSE

       Copyright (C) 2009-2016 H.Merijn Brand

       This library is free software; you can redistribute it and/or modify it under the same
       terms as Perl itself.