1V(3)                  User Contributed Perl Documentation                 V(3)
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NAME

6       Config::Perl::V - Structured data retrieval of perl -V output
7

SYNOPSIS

9        use Config::Perl::V;
10
11        my $local_config = Config::Perl::V::myconfig ();
12        print $local_config->{config}{osname};
13

DESCRIPTION

15   $conf = myconfig ()
16       This function will collect the data described in "The hash structure"
17       below, and return that as a hash reference. It optionally accepts an
18       option to include more entries from %ENV. See "environment" below.
19
20       Note that this will not work on uninstalled perls when called with
21       "-I/path/to/uninstalled/perl/lib", but it works when that path is in
22       $PERL5LIB or in $PERL5OPT, as paths passed using "-I" are not known
23       when the "-V" information is collected.
24
25   $conf = plv2hash ($text [, ...])
26       Convert a sole 'perl -V' text block, or list of lines, to a complete
27       myconfig hash.  All unknown entries are defaulted.
28
29   $info = summary ([$conf])
30       Return an arbitrary selection of the information. If no $conf is given,
31       "myconfig ()" is used instead.
32
33   $md5 = signature ([$conf])
34       Return the MD5 of the info returned by "summary ()" without the
35       "config_args" entry.
36
37       If "Digest::MD5" is not available, it return a string with only 0's.
38
39   The hash structure
40       The returned hash consists of 4 parts:
41
42       build
43           This information is extracted from the second block that is emitted
44           by "perl -V", and usually looks something like
45
46            Characteristics of this binary (from libperl):
47              Compile-time options: DEBUGGING USE_64_BIT_INT USE_LARGE_FILES
48              Locally applied patches:
49                    defined-or
50                    MAINT24637
51              Built under linux
52              Compiled at Jun 13 2005 10:44:20
53              @INC:
54                /usr/lib/perl5/5.8.7/i686-linux-64int
55                /usr/lib/perl5/5.8.7
56                /usr/lib/perl5/site_perl/5.8.7/i686-linux-64int
57                /usr/lib/perl5/site_perl/5.8.7
58                /usr/lib/perl5/site_perl
59                .
60
61           or
62
63            Characteristics of this binary (from libperl):
64              Compile-time options: DEBUGGING MULTIPLICITY
65                                    PERL_DONT_CREATE_GVSV PERL_IMPLICIT_CONTEXT
66                                    PERL_MALLOC_WRAP PERL_TRACK_MEMPOOL
67                                    PERL_USE_SAFE_PUTENV USE_ITHREADS
68                                    USE_LARGE_FILES USE_PERLIO
69                                    USE_REENTRANT_API
70              Built under linux
71              Compiled at Jan 28 2009 15:26:59
72
73           This information is not available anywhere else, including %Config,
74           but it is the information that is only known to the perl binary.
75
76           The extracted information is stored in 5 entries in the "build"
77           hash:
78
79           osname
80               This is most likely the same as $Config{osname}, and was the
81               name known when perl was built. It might be different if perl
82               was cross-compiled.
83
84               The default for this field, if it cannot be extracted, is to
85               copy $Config{osname}. The two may be differing in casing
86               (OpenBSD vs openbsd).
87
88           stamp
89               This is the time string for which the perl binary was compiled.
90               The default value is 0.
91
92           options
93               This is a hash with all the known defines as keys. The value is
94               either 0, which means unknown or unset, or 1, which means
95               defined.
96
97           derived
98               As some variables are reported by a different name in the
99               output of "perl -V" than their actual name in %Config, I
100               decided to leave the "config" entry as close to reality as
101               possible, and put in the entries that might have been guessed
102               by the printed output in a separate block.
103
104           patches
105               This is a list of optionally locally applied patches. Default
106               is an empty list.
107
108       environment
109           By default this hash is only filled with the environment variables
110           out of %ENV that start with "PERL", but you can pass the "env"
111           option to myconfig to get more
112
113            my $conf = Config::Perl::V::myconfig ({ env => qr/^ORACLE/ });
114            my $conf = Config::Perl::V::myconfig ([ env => qr/^ORACLE/ ]);
115
116       config
117           This hash is filled with the variables that "perl -V" fills its
118           report with, and it has the same variables that "Config::myconfig"
119           returns from %Config.
120
121       inc This is the list of default @INC.
122

REASONING

124       This module was written to be able to return the configuration for the
125       currently used perl as deeply as needed for the CPANTESTERS framework.
126       Up until now they used the output of myconfig as a single text blob,
127       and so it was missing the vital binary characteristics of the running
128       perl and the optional applied patches.
129

BUGS

131       Please feedback what is wrong
132

TODO

134        * Implement retrieval functions/methods
135        * Documentation
136        * Error checking
137        * Tests
138

AUTHOR

140       H.Merijn Brand <h.m.brand@xs4all.nl>
141

143       Copyright (C) 2009-2023 H.Merijn Brand
144
145       This library is free software; you can redistribute it and/or modify it
146       under the same terms as Perl itself.
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150perl v5.36.0                      2023-03-02                              V(3)
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