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Module::Build::API(3)	       User Contributed Perl Documentation	    Module::Build::API(3)

NAME
       Module::Build::API - API Reference for Module Authors

DESCRIPTION
       I list here some of the most important methods in "Module::Build".  Normally you won't
       need to deal with these methods unless you want to subclass "Module::Build".  But since
       one of the reasons I created this module in the first place was so that subclassing is
       possible (and easy), I will certainly write more docs as the interface stabilizes.

   CONSTRUCTORS
       current()
	   [version 0.20]

	   This method returns a reasonable facsimile of the currently-executing "Module::Build"
	   object representing the current build.  You can use this object to query its "notes()"
	   method, inquire about installed modules, and so on.	This is a great way to share
	   information between different parts of your build process.  For instance, you can ask
	   the user a question during "perl Build.PL", then use their answer during a regression
	   test:

	     # In Build.PL:
	     my $color = $build->prompt("What is your favorite color?");
	     $build->notes(color => $color);

	     # In t/colortest.t:
	     use Module::Build;
	     my $build = Module::Build->current;
	     my $color = $build->notes('color');
	     ...

	   The way the "current()" method is currently implemented, there may be slight
	   differences between the $build object in Build.PL and the one in "t/colortest.t".  It
	   is our goal to minimize these differences in future releases of Module::Build, so
	   please report any anomalies you find.

	   One important caveat: in its current implementation, "current()" will NOT work
	   correctly if you have changed out of the directory that "Module::Build" was invoked
	   from.

       new()
	   [version 0.03]

	   Creates a new Module::Build object.	Arguments to the new() method are listed below.
	   Most arguments are optional, but you must provide either the "module_name" argument,
	   or "dist_name" and one of "dist_version" or "dist_version_from".  In other words, you
	   must provide enough information to determine both a distribution name and version.

	   add_to_cleanup
	       [version 0.19]

	       An array reference of files to be cleaned up when the "clean" action is performed.
	       See also the add_to_cleanup() method.

	   allow_pureperl
	       [version 0.4005]

	       A bool indicating the module is still functional without its xs parts.  When an XS
	       module is build with --pureperl_only, it will otherwise fail.

	   auto_configure_requires
	       [version 0.34]

	       This parameter determines whether Module::Build will add itself automatically to
	       configure_requires (and build_requires) if Module::Build is not already there.
	       The required version will be the last 'major' release, as defined by the decimal
	       version truncated to two decimal places (e.g. 0.34, instead of 0.3402).	The
	       default value is true.

	   auto_features
	       [version 0.26]

	       This parameter supports the setting of features (see "feature($name)")
	       automatically based on a set of prerequisites.  For instance, for a module that
	       could optionally use either MySQL or PostgreSQL databases, you might use
	       "auto_features" like this:

		 my $build = Module::Build->new
		   (
		    ...other stuff here...
		    auto_features => {
		      pg_support    => {
					description => "Interface with Postgres databases",
					requires    => { 'DBD::Pg' => 23.3,
							 'DateTime::Format::Pg' => 0 },
				       },
		      mysql_support => {
					description => "Interface with MySQL databases",
					requires    => { 'DBD::mysql' => 17.9,
							 'DateTime::Format::MySQL' => 0 },
				       },
		    }
		   );

	       For each feature named, the required prerequisites will be checked, and if there
	       are no failures, the feature will be enabled (set to 1).  Otherwise the failures
	       will be displayed to the user and the feature will be disabled (set to 0).

	       See the documentation for "requires" for the details of how requirements can be
	       specified.

	   autosplit
	       [version 0.04]

	       An optional "autosplit" argument specifies a file which should be run through the
	       AutoSplit::autosplit() function.  If multiple files should be split, the argument
	       may be given as an array of the files to split.

	       In general I don't consider autosplitting a great idea, because it's not always
	       clear that autosplitting achieves its intended performance benefits.  It may even
	       harm performance in environments like mod_perl, where as much as possible of a
	       module's code should be loaded during startup.

	   build_class
	       [version 0.28]

	       The Module::Build class or subclass to use in the build script.	Defaults to
	       "Module::Build" or the class name passed to or created by a call to "subclass()".
	       This property is useful if you're writing a custom Module::Build subclass and have
	       a bootstrapping problem--that is, your subclass requires modules that may not be
	       installed when "perl Build.PL" is executed, but you've listed in "build_requires"
	       so that they should be available when "./Build" is executed.

	   build_requires
	       [version 0.07]

	       Modules listed in this section are necessary to build and install the given
	       module, but are not necessary for regular usage of it.  This is actually an
	       important distinction - it allows for tighter control over the body of installed
	       modules, and facilitates correct dependency checking on binary/packaged
	       distributions of the module.

	       See the documentation for "PREREQUISITES" in Module::Build::Authoring for the
	       details of how requirements can be specified.

	   configure_requires
	       [version 0.30]

	       Modules listed in this section must be installed before configuring this
	       distribution (i.e. before running the Build.PL script).	This might be a specific
	       minimum version of "Module::Build" or any other module the Build.PL needs in order
	       to do its stuff.  Clients like "CPAN.pm" or "CPANPLUS" will be expected to pick
	       "configure_requires" out of the META.yml file and install these items before
	       running the "Build.PL".

	       Module::Build may automatically add itself to configure_requires.  See
	       "auto_configure_requires" for details.

	       See the documentation for "PREREQUISITES" in Module::Build::Authoring for the
	       details of how requirements can be specified.

	   test_requires
	       [version 0.4004]

	       Modules listed in this section must be installed before testing the distribution.

	       See the documentation for "PREREQUISITES" in Module::Build::Authoring for the
	       details of how requirements can be specified.

	   create_packlist
	       [version 0.28]

	       If true, this parameter tells Module::Build to create a .packlist file during the
	       "install" action, just like "ExtUtils::MakeMaker" does.	The file is created in a
	       subdirectory of the "arch" installation location.  It is used by some other tools
	       (CPAN, CPANPLUS, etc.) for determining what files are part of an install.

	       The default value is true.  This parameter was introduced in Module::Build version
	       0.2609; previously no packlists were ever created by Module::Build.

	   c_source
	       [version 0.04]

	       An optional "c_source" argument specifies a directory which contains C source
	       files that the rest of the build may depend on.	Any ".c" files in the directory
	       will be compiled to object files.  The directory will be added to the search path
	       during the compilation and linking phases of any C or XS files.

	       [version 0.3604]

	       A list of directories can be supplied using an anonymous array reference of
	       strings.

	   conflicts
	       [version 0.07]

	       Modules listed in this section conflict in some serious way with the given module.
	       "Module::Build" (or some higher-level tool) will refuse to install the given
	       module if the given module/version is also installed.

	       See the documentation for "PREREQUISITES" in Module::Build::Authoring for the
	       details of how requirements can be specified.

	   create_license
	       [version 0.31]

	       This parameter tells Module::Build to automatically create a LICENSE file at the
	       top level of your distribution, containing the full text of the author's chosen
	       license.  This requires "Software::License" on the author's machine, and further
	       requires that the "license" parameter specifies a license that it knows about.

	   create_makefile_pl
	       [version 0.19]

	       This parameter lets you use "Module::Build::Compat" during the "distdir" (or
	       "dist") action to automatically create a Makefile.PL for compatibility with
	       "ExtUtils::MakeMaker".  The parameter's value should be one of the styles named in
	       the Module::Build::Compat documentation.

	   create_readme
	       [version 0.22]

	       This parameter tells Module::Build to automatically create a README file at the
	       top level of your distribution.	Currently it will simply use "Pod::Text" (or
	       "Pod::Readme" if it's installed) on the file indicated by "dist_version_from" and
	       put the result in the README file.  This is by no means the only recommended style
	       for writing a README, but it seems to be one common one used on the CPAN.

	       If you generate a README in this way, it's probably a good idea to create a
	       separate INSTALL file if that information isn't in the generated README.

	   dist_abstract
	       [version 0.20]

	       This should be a short description of the distribution.	This is used when
	       generating metadata for META.yml and PPD files.	If it is not given then
	       "Module::Build" looks in the POD of the module from which it gets the
	       distribution's version.	If it finds a POD section marked "=head1 NAME", then it
	       looks for the first line matching "\s+-\s+(.+)", and uses the captured text as the
	       abstract.

	   dist_author
	       [version 0.20]

	       This should be something like "John Doe <jdoe@example.com>", or if there are
	       multiple authors, an anonymous array of strings may be specified.  This is used
	       when generating metadata for META.yml and PPD files.  If this is not specified,
	       then "Module::Build" looks at the module from which it gets the distribution's
	       version.  If it finds a POD section marked "=head1 AUTHOR", then it uses the
	       contents of this section.

	   dist_name
	       [version 0.11]

	       Specifies the name for this distribution.  Most authors won't need to set this
	       directly, they can use "module_name" to set "dist_name" to a reasonable default.
	       However, some agglomerative distributions like "libwww-perl" or "bioperl" have
	       names that don't correspond directly to a module name, so "dist_name" can be set
	       independently.

	   dist_suffix
	       [version 0.37]

	       Specifies an optional suffix to include after the version number in the
	       distribution directory (and tarball) name.  The only suffix currently recognized
	       by PAUSE is 'TRIAL', which indicates that the distribution should not be indexed.
	       For example:

		 Foo-Bar-1.23-TRIAL.tar.gz

	       This will automatically do the "right thing" depending on "dist_version" and
	       "release_status".  When "dist_version" does not have an underscore and
	       "release_status" is not 'stable', then "dist_suffix" will default to 'TRIAL'.
	       Otherwise it will default to the empty string, disabling the suffix.

	       In general, authors should only set this if they must override the default
	       behavior for some particular purpose.

	   dist_version
	       [version 0.11]

	       Specifies a version number for the distribution.  See "module_name" or
	       "dist_version_from" for ways to have this set automatically from a $VERSION
	       variable in a module.  One way or another, a version number needs to be set.

	   dist_version_from
	       [version 0.11]

	       Specifies a file to look for the distribution version in.  Most authors won't need
	       to set this directly, they can use "module_name" to set it to a reasonable
	       default.

	       The version is extracted from the specified file according to the same rules as
	       ExtUtils::MakeMaker and "CPAN.pm".  It involves finding the first line that
	       matches the regular expression

		  /([\$*])(([\w\:\']*)\bVERSION)\b.*\=/

	       eval()-ing that line, then checking the value of the $VERSION variable.	Quite
	       ugly, really, but all the modules on CPAN depend on this process, so there's no
	       real opportunity to change to something better.

	       If the target file of "dist_version_from" contains more than one package
	       declaration, the version returned will be the one matching the configured
	       "module_name".

	   dynamic_config
	       [version 0.07]

	       A boolean flag indicating whether the Build.PL file must be executed, or whether
	       this module can be built, tested and installed solely from consulting its metadata
	       file.  The main reason to set this to a true value is that your module performs
	       some dynamic configuration as part of its build/install process.  If the flag is
	       omitted, the META.yml spec says that installation tools should treat it as 1
	       (true), because this is a safer way to behave.

	       Currently "Module::Build" doesn't actually do anything with this flag - it's up to
	       higher-level tools like "CPAN.pm" to do something useful with it.  It can
	       potentially bring lots of security, packaging, and convenience improvements.

	   extra_compiler_flags
	   extra_linker_flags
	       [version 0.19]

	       These parameters can contain array references (or strings, in which case they will
	       be split into arrays) to pass through to the compiler and linker phases when
	       compiling/linking C code.  For example, to tell the compiler that your code is
	       C++, you might do:

		 my $build = Module::Build->new
		   (
		    module_name 	 => 'Foo::Bar',
		    extra_compiler_flags => ['-x', 'c++'],
		   );

	       To link your XS code against glib you might write something like:

		 my $build = Module::Build->new
		   (
		    module_name 	 => 'Foo::Bar',
		    dynamic_config	 => 1,
		    extra_compiler_flags => scalar `glib-config --cflags`,
		    extra_linker_flags	 => scalar `glib-config --libs`,
		   );

	   get_options
	       [version 0.26]

	       You can pass arbitrary command line options to Build.PL or Build, and they will be
	       stored in the Module::Build object and can be accessed via the "args()" method.
	       However, sometimes you want more flexibility out of your argument processing than
	       this allows.  In such cases, use the "get_options" parameter to pass in a hash
	       reference of argument specifications, and the list of arguments to Build.PL or
	       Build will be processed according to those specifications before they're passed on
	       to "Module::Build"'s own argument processing.

	       The supported option specification hash keys are:

	       type
		   The type of option.	The types are those supported by Getopt::Long; consult
		   its documentation for a complete list.  Typical types are "=s" for strings,
		   "+" for additive options, and "!" for negatable options.  If the type is not
		   specified, it will be considered a boolean, i.e. no argument is taken and a
		   value of 1 will be assigned when the option is encountered.

	       store
		   A reference to a scalar in which to store the value passed to the option.  If
		   not specified, the value will be stored under the option name in the hash
		   returned by the "args()" method.

	       default
		   A default value for the option.  If no default value is specified and no
		   option is passed, then the option key will not exist in the hash returned by
		   "args()".

	       You can combine references to your own variables or subroutines with unreferenced
	       specifications, for which the result will also be stored in the hash returned by
	       "args()".  For example:

		 my $loud = 0;
		 my $build = Module::Build->new
		   (
		    module_name => 'Foo::Bar',
		    get_options => {
				    Loud =>	{ store => \$loud },
				    Dbd  =>	{ type	=> '=s'   },
				    Quantity => { type	=> '+'	  },
				   }
		   );

		 print STDERR "HEY, ARE YOU LISTENING??\n" if $loud;
		 print "We'll use the ", $build->args('Dbd'), " DBI driver\n";
		 print "Are you sure you want that many?\n"
		   if $build->args('Quantity') > 2;

	       The arguments for such a specification can be called like so:

		 perl Build.PL --Loud --Dbd=DBD::pg --Quantity --Quantity --Quantity

	       WARNING: Any option specifications that conflict with Module::Build's own options
	       (defined by its properties) will throw an exception.  Use capitalized option names
	       to avoid unintended conflicts with future Module::Build options.

	       Consult the Getopt::Long documentation for details on its usage.

	   include_dirs
	       [version 0.24]

	       Specifies any additional directories in which to search for C header files.  May
	       be given as a string indicating a single directory, or as a list reference
	       indicating multiple directories.

	   install_path
	       [version 0.19]

	       You can set paths for individual installable elements by using the "install_path"
	       parameter:

		 my $build = Module::Build->new
		   (
		    ...other stuff here...
		    install_path => {
				     lib  => '/foo/lib',
				     arch => '/foo/lib/arch',
				    }
		   );

	   installdirs
	       [version 0.19]

	       Determines where files are installed within the normal perl hierarchy as
	       determined by Config.pm.  Valid values are: "core", "site", "vendor".  The default
	       is "site".  See "INSTALL PATHS" in Module::Build

	   license
	       [version 0.07]

	       Specifies the licensing terms of your distribution.

	       As of Module::Build version 0.36_14, you may use a Software::License subclass name
	       (e.g. 'Apache_2_0') instead of one of the keys below.

	       The legacy list of valid license values include:

	       apache
		   The distribution is licensed under the Apache License, Version 2.0
		   (<http://apache.org/licenses/LICENSE-2.0>).

	       apache_1_1
		   The distribution is licensed under the Apache Software License, Version 1.1
		   (<http://apache.org/licenses/LICENSE-1.1>).

	       artistic
		   The distribution is licensed under the Artistic License, as specified by the
		   Artistic file in the standard Perl distribution.

	       artistic_2
		   The distribution is licensed under the Artistic 2.0 License
		   (<http://opensource.org/licenses/artistic-license-2.0.php>.)

	       bsd The distribution is licensed under the BSD License
		   (<http://www.opensource.org/licenses/bsd-license.php>).

	       gpl The distribution is licensed under the terms of the GNU General Public License
		   (<http://www.opensource.org/licenses/gpl-license.php>).

	       lgpl
		   The distribution is licensed under the terms of the GNU Lesser General Public
		   License (<http://www.opensource.org/licenses/lgpl-license.php>).

	       mit The distribution is licensed under the MIT License
		   (<http://opensource.org/licenses/mit-license.php>).

	       mozilla
		   The distribution is licensed under the Mozilla Public License.
		   (<http://opensource.org/licenses/mozilla1.0.php> or
		   <http://opensource.org/licenses/mozilla1.1.php>)

	       open_source
		   The distribution is licensed under some other Open Source Initiative-approved
		   license listed at <http://www.opensource.org/licenses/>.

	       perl
		   The distribution may be copied and redistributed under the same terms as Perl
		   itself (this is by far the most common licensing option for modules on CPAN).
		   This is a dual license, in which the user may choose between either the GPL or
		   the Artistic license.

	       restrictive
		   The distribution may not be redistributed without special permission from the
		   author and/or copyright holder.

	       unrestricted
		   The distribution is licensed under a license that is not approved by
		   www.opensource.org but that allows distribution without restrictions.

	       Note that you must still include the terms of your license in your code and
	       documentation - this field only sets the information that is included in
	       distribution metadata to let automated tools figure out your licensing
	       restrictions.  Humans still need something to read.  If you choose to provide this
	       field, you should make sure that you keep it in sync with your written
	       documentation if you ever change your licensing terms.

	       You may also use a license type of "unknown" if you don't wish to specify your
	       terms in the metadata.

	       Also see the "create_license" parameter.

	   meta_add
	       [version 0.28]

	       A hash of key/value pairs that should be added to the META.yml file during the
	       "distmeta" action.  Any existing entries with the same names will be overridden.

	       See the "MODULE METADATA" section for details.

	   meta_merge
	       [version 0.28]

	       A hash of key/value pairs that should be merged into the META.yml file during the
	       "distmeta" action.  Any existing entries with the same names will be overridden.

	       The only difference between "meta_add" and "meta_merge" is their behavior on hash-
	       valued and array-valued entries: "meta_add" will completely blow away the existing
	       hash or array value, but "meta_merge" will merge the supplied data into the
	       existing hash or array value.

	       See the "MODULE METADATA" section for details.

	   module_name
	       [version 0.03]

	       The "module_name" is a shortcut for setting default values of "dist_name" and
	       "dist_version_from", reflecting the fact that the majority of CPAN distributions
	       are centered around one "main" module.  For instance, if you set "module_name" to
	       "Foo::Bar", then "dist_name" will default to "Foo-Bar" and "dist_version_from"
	       will default to "lib/Foo/Bar.pm".  "dist_version_from" will in turn be used to set
	       "dist_version".

	       Setting "module_name" won't override a "dist_*" parameter you specify explicitly.

	   needs_compiler
	       [version 0.36]

	       The "needs_compiler" parameter indicates whether a compiler is required to build
	       the distribution.  The default is false, unless XS files are found or the
	       "c_source" parameter is set, in which case it is true.  If true,
	       ExtUtils::CBuilder is automatically added to "build_requires" if needed.

	       For a distribution where a compiler is optional, e.g. a dual XS/pure-Perl
	       distribution, "needs_compiler" should explicitly be set to a false value.

	   PL_files
	       [version 0.06]

	       An optional parameter specifying a set of ".PL" files in your distribution.  These
	       will be run as Perl scripts prior to processing the rest of the files in your
	       distribution with the name of the file they're generating as an argument.  They
	       are usually used as templates for creating other files dynamically, so that a file
	       like "lib/Foo/Bar.pm.PL" might create the file "lib/Foo/Bar.pm".

	       The files are specified with the ".PL" files as hash keys, and the file(s) they
	       generate as hash values, like so:

		 my $build = Module::Build->new
		   (
		    module_name => 'Foo::Bar',
		    ...
		    PL_files => { 'lib/Foo/Bar.pm.PL' => 'lib/Foo/Bar.pm' },
		   );

	       Note that the path specifications are always given in Unix-like format, not in the
	       style of the local system.

	       If your ".PL" scripts don't create any files, or if they create files with
	       unexpected names, or even if they create multiple files, you can indicate that so
	       that Module::Build can properly handle these created files:

		 PL_files => {
			      'lib/Foo/Bar.pm.PL' => 'lib/Foo/Bar.pm',
			      'lib/something.PL'  => ['/lib/something', '/lib/else'],
			      'lib/funny.PL'	  => [],
			     }

	       Here's an example of a simple PL file.

		   my $output_file = shift;
		   open my $fh, ">", $output_file or die "Can't open $output_file: $!";

		   print $fh <<'END';
		   #!/usr/bin/perl

		   print "Hello, world!\n";
		   END

	       PL files are not installed by default, so its safe to put them in lib/ and bin/.

	   pm_files
	       [version 0.19]

	       An optional parameter specifying the set of ".pm" files in this distribution,
	       specified as a hash reference whose keys are the files' locations in the
	       distributions, and whose values are their logical locations based on their package
	       name, i.e. where they would be found in a "normal" Module::Build-style
	       distribution.  This parameter is mainly intended to support alternative layouts of
	       files.

	       For instance, if you have an old-style "MakeMaker" distribution for a module
	       called "Foo::Bar" and a Bar.pm file at the top level of the distribution, you
	       could specify your layout in your "Build.PL" like this:

		 my $build = Module::Build->new
		   (
		    module_name => 'Foo::Bar',
		    ...
		    pm_files => { 'Bar.pm' => 'lib/Foo/Bar.pm' },
		   );

	       Note that the values should include "lib/", because this is where they would be
	       found in a "normal" Module::Build-style distribution.

	       Note also that the path specifications are always given in Unix-like format, not
	       in the style of the local system.

	   pod_files
	       [version 0.19]

	       Just like "pm_files", but used for specifying the set of ".pod" files in your
	       distribution.

	   recommends
	       [version 0.08]

	       This is just like the "requires" argument, except that modules listed in this
	       section aren't essential, just a good idea.  We'll just print a friendly warning
	       if one of these modules aren't found, but we'll continue running.

	       If a module is recommended but not required, all tests should still pass if the
	       module isn't installed.	This may mean that some tests may be skipped if
	       recommended dependencies aren't present.

	       Automated tools like CPAN.pm should inform the user when recommended modules
	       aren't installed, and it should offer to install them if it wants to be helpful.

	       See the documentation for "PREREQUISITES" in Module::Build::Authoring for the
	       details of how requirements can be specified.

	   recursive_test_files
	       [version 0.28]

	       Normally, "Module::Build" does not search subdirectories when looking for tests to
	       run. When this options is set it will search recursively in all subdirectories of
	       the standard 't' test directory.

	   release_status
	       [version 0.37]

	       The CPAN Meta Spec version 2 adds "release_status" to allow authors to specify how
	       a distribution should be indexed.  Consistent with the spec, this parameter can
	       only have one three values: 'stable', 'testing' or 'unstable'.

	       Unless explicitly set by the author, "release_status" will default to 'stable'
	       unless "dist_version" contains an underscore, in which case it will default to
	       'testing'.

	       It is an error to specify a "release_status" of 'stable' when "dist_version"
	       contains an underscore character.

	   requires
	       [version 0.07]

	       An optional "requires" argument specifies any module prerequisites that the
	       current module depends on.

	       One note: currently "Module::Build" doesn't actually require the user to have
	       dependencies installed, it just strongly urges.	In the future we may require it.
	       There's also a "recommends" section for things that aren't absolutely required.

	       Automated tools like CPAN.pm should refuse to install a module if one of its
	       dependencies isn't satisfied, unless a "force" command is given by the user.  If
	       the tools are helpful, they should also offer to install the dependencies.

	       A synonym for "requires" is "prereq", to help succour people transitioning from
	       "ExtUtils::MakeMaker".  The "requires" term is preferred, but the "prereq" term
	       will remain valid in future distributions.

	       See the documentation for "PREREQUISITES" in Module::Build::Authoring for the
	       details of how requirements can be specified.

	   script_files
	       [version 0.18]

	       An optional parameter specifying a set of files that should be installed as
	       executable Perl scripts when the module is installed.  May be given as an array
	       reference of the files, as a hash reference whose keys are the files (and whose
	       values will currently be ignored), as a string giving the name of a directory in
	       which to find scripts, or as a string giving the name of a single script file.

	       The default is to install any scripts found in a bin directory at the top level of
	       the distribution, minus any keys of PL_files.

	       For backward compatibility, you may use the parameter "scripts" instead of
	       "script_files".	Please consider this usage deprecated, though it will continue to
	       exist for several version releases.

	   share_dir
	       [version 0.36]

	       An optional parameter specifying directories of static data files to be installed
	       as read-only files for use with File::ShareDir.	The "share_dir" property supports
	       both distribution-level and module-level share files.

	       The simplest use of "share_dir" is to set it to a directory name or an arrayref of
	       directory names containing files to be installed in the distribution-level share
	       directory.

		 share_dir => 'share'

	       Alternatively, if "share_dir" is a hashref, it may have "dist" or "module" keys
	       providing full flexibility in defining how share directories should be installed.

		 share_dir => {
		   dist => [ 'examples', 'more_examples' ],
		   module => {
		     Foo::Templates => ['share/html', 'share/text'],
		     Foo::Config    => 'share/config',
		   }
		 }

	       If "share_dir" is set, then File::ShareDir will automatically be added to the
	       "requires" hash.

	   sign
	       [version 0.16]

	       If a true value is specified for this parameter, Module::Signature will be used
	       (via the 'distsign' action) to create a SIGNATURE file for your distribution
	       during the 'distdir' action, and to add the SIGNATURE file to the MANIFEST
	       (therefore, don't add it yourself).

	       The default value is false.  In the future, the default may change to true if you
	       have "Module::Signature" installed on your system.

	   tap_harness_args
	       [version 0.2808_03]

	       An optional parameter specifying parameters to be passed to TAP::Harness when
	       running tests. Must be given as a hash reference of parameters; see the
	       TAP::Harness documentation for details. Note that specifying this parameter will
	       implicitly set "use_tap_harness" to a true value. You must therefore be sure to
	       add TAP::Harness as a requirement for your module in "build_requires".

	   test_files
	       [version 0.23]

	       An optional parameter specifying a set of files that should be used as
	       "Test::Harness"-style regression tests to be run during the "test" action.  May be
	       given as an array reference of the files, or as a hash reference whose keys are
	       the files (and whose values will currently be ignored).	If the argument is given
	       as a single string (not in an array reference), that string will be treated as a
	       "glob()" pattern specifying the files to use.

	       The default is to look for a test.pl script in the top-level directory of the
	       distribution, and any files matching the glob pattern "*.t" in the t/
	       subdirectory.  If the "recursive_test_files" property is true, then the "t/"
	       directory will be scanned recursively for "*.t" files.

	   use_tap_harness
	       [version 0.2808_03]

	       An optional parameter indicating whether or not to use TAP::Harness for testing
	       rather than Test::Harness. Defaults to false. If set to true, you must therefore
	       be sure to add TAP::Harness as a requirement for your module in "build_requires".
	       Implicitly set to a true value if "tap_harness_args" is specified.

	   xs_files
	       [version 0.19]

	       Just like "pm_files", but used for specifying the set of ".xs" files in your
	       distribution.

       new_from_context(%args)
	   [version 0.28]

	   When called from a directory containing a Build.PL script (in other words, the base
	   directory of a distribution), this method will run the Build.PL and call "resume()" to
	   return the resulting "Module::Build" object to the caller.  Any key-value arguments
	   given to "new_from_context()" are essentially like command line arguments given to the
	   Build.PL script, so for example you could pass "verbose => 1" to this method to turn
	   on verbosity.

       resume()
	   [version 0.03]

	   You'll probably never call this method directly, it's only called from the auto-
	   generated "Build" script (and the "new_from_context" method).  The "new()" method is
	   only called once, when the user runs "perl Build.PL".  Thereafter, when the user runs
	   "Build test" or another action, the "Module::Build" object is created using the
	   "resume()" method to re-instantiate with the settings given earlier to "new()".

       subclass()
	   [version 0.06]

	   This creates a new "Module::Build" subclass on the fly, as described in the
	   "SUBCLASSING" in Module::Build::Authoring section.  The caller must provide either a
	   "class" or "code" parameter, or both.  The "class" parameter indicates the name to use
	   for the new subclass, and defaults to "MyModuleBuilder".  The "code" parameter
	   specifies Perl code to use as the body of the subclass.

       add_property
	   [version 0.31]

	     package 'My::Build';
	     use base 'Module::Build';
	     __PACKAGE__->add_property( 'pedantic' );
	     __PACKAGE__->add_property( answer => 42 );
	     __PACKAGE__->add_property(
		'epoch',
		 default => sub { time },
		 check	 => sub {
		     return 1 if /^\d+$/;
		     shift->property_error( "'$_' is not an epoch time" );
		     return 0;
		 },
	     );

	   Adds a property to a Module::Build class. Properties are those attributes of a
	   Module::Build object which can be passed to the constructor and which have accessors
	   to get and set them. All of the core properties, such as "module_name" and "license",
	   are defined using this class method.

	   The first argument to "add_property()" is always the name of the property.  The second
	   argument can be either a default value for the property, or a list of key/value pairs.
	   The supported keys are:

	   "default"
	       The default value. May optionally be specified as a code reference, in which case
	       the return value from the execution of the code reference will be used.	If you
	       need the default to be a code reference, just use a code reference to return it,
	       e.g.:

		     default => sub { sub { ... } },

	   "check"
	       A code reference that checks that a value specified for the property is valid.
	       During the execution of the code reference, the new value will be included in the
	       $_ variable. If the value is correct, the "check" code reference should return
	       true. If the value is not correct, it sends an error message to "property_error()"
	       and returns false.

	   When this method is called, a new property will be installed in the Module::Build
	   class, and an accessor will be built to allow the property to be get or set on the
	   build object.

	     print $build->pedantic, $/;
	     $build->pedantic(0);

	   If the default value is a hash reference, this generates a special-case accessor
	   method, wherein individual key/value pairs may be set or fetched:

	     print "stuff{foo} is: ", $build->stuff( 'foo' ), $/;
	     $build->stuff( foo => 'bar' );
	     print $build->stuff( 'foo' ), $/; # Outputs "bar"

	   Of course, you can still set the entire hash reference at once, as well:

	     $build->stuff( { foo => 'bar', baz => 'yo' } );

	   In either case, if a "check" has been specified for the property, it will be applied
	   to the entire hash. So the check code reference should look something like:

		 check => sub {
		       return 1 if defined $_ && exists $_->{foo};
		       shift->property_error(qq{Property "stuff" needs "foo"});
		       return 0;
		 },

       property_error
	   [version 0.31]

   METHODS
       add_build_element($type)
	   [version 0.26]

	   Adds a new type of entry to the build process.  Accepts a single string specifying its
	   type-name.  There must also be a method defined to process things of that type, e.g.
	   if you add a build element called 'foo', then you must also define a method called
	   "process_foo_files()".

	   See also "Adding new file types to the build process" in Module::Build::Cookbook.

       add_to_cleanup(@files)
	   [version 0.03]

	   You may call "$self->add_to_cleanup(@patterns)" to tell "Module::Build" that certain
	   files should be removed when the user performs the "Build clean" action.  The
	   arguments to the method are patterns suitable for passing to Perl's "glob()" function,
	   specified in either Unix format or the current machine's native format.  It's usually
	   convenient to use Unix format when you hard-code the filenames (e.g. in Build.PL) and
	   the native format when the names are programmatically generated (e.g. in a testing
	   script).

	   I decided to provide a dynamic method of the $build object, rather than just use a
	   static list of files named in the Build.PL, because these static lists can get
	   difficult to manage.  I usually prefer to keep the responsibility for registering
	   temporary files close to the code that creates them.

       args()
	   [version 0.26]

	     my $args_href = $build->args;
	     my %args = $build->args;
	     my $arg_value = $build->args($key);
	     $build->args($key, $value);

	   This method is the preferred interface for retrieving the arguments passed via command
	   line options to Build.PL or Build, minus the Module-Build specific options.

	   When called in in a scalar context with no arguments, this method returns a reference
	   to the hash storing all of the arguments; in an array context, it returns the hash
	   itself.  When passed a single argument, it returns the value stored in the args hash
	   for that option key.  When called with two arguments, the second argument is assigned
	   to the args hash under the key passed as the first argument.

       autosplit_file($from, $to)
	   [version 0.28]

	   Invokes the AutoSplit module on the $from file, sending the output to the "lib/auto"
	   directory inside $to.  $to is typically the "blib/" directory.

       base_dir()
	   [version 0.14]

	   Returns a string containing the root-level directory of this build, i.e. where the
	   "Build.PL" script and the "lib" directory can be found.  This is usually the same as
	   the current working directory, because the "Build" script will "chdir()" into this
	   directory as soon as it begins execution.

       build_requires()
	   [version 0.21]

	   Returns a hash reference indicating the "build_requires" prerequisites that were
	   passed to the "new()" method.

       can_action( $action )
	   Returns a reference to the method that defines $action, or false otherwise. This is
	   handy for actions defined (or maybe not!) in subclasses.

	   [version 0.32_xx]

       cbuilder()
	   [version 0.2809]

	   Returns the internal ExtUtils::CBuilder object that can be used for compiling &
	   linking C code.  If no such object is available (e.g. if the system has no compiler
	   installed) an exception will be thrown.

       check_installed_status($module, $version)
	   [version 0.11]

	   This method returns a hash reference indicating whether a version dependency on a
	   certain module is satisfied.  The $module argument is given as a string like
	   "Data::Dumper" or "perl", and the $version argument can take any of the forms
	   described in "requires" above.  This allows very fine-grained version checking.

	   The returned hash reference has the following structure:

	     {
	      ok => $whether_the_dependency_is_satisfied,
	      have => $version_already_installed,
	      need => $version_requested, # Same as incoming $version argument
	      message => $informative_error_message,
	     }

	   If no version of $module is currently installed, the "have" value will be the string
	   "<none>".  Otherwise the "have" value will simply be the version of the installed
	   module.  Note that this means that if $module is installed but doesn't define a
	   version number, the "have" value will be "undef" - this is why we don't use "undef"
	   for the case when $module isn't installed at all.

	   This method may be called either as an object method
	   ("$build->check_installed_status($module, $version)") or as a class method
	   ("Module::Build->check_installed_status($module, $version)").

       check_installed_version($module, $version)
	   [version 0.05]

	   Like check_installed_status(), but simply returns true or false depending on whether
	   module $module satisfies the dependency $version.

	   If the check succeeds, the return value is the actual version of $module installed on
	   the system.	This allows you to do the following:

	     my $installed = $build->check_installed_version('DBI', '1.15');
	     if ($installed) {
	       print "Congratulations, version $installed of DBI is installed.\n";
	     } else {
	       die "Sorry, you must install DBI.\n";
	     }

	   If the check fails, we return false and set $@ to an informative error message.

	   If $version is any non-true value (notably zero) and any version of $module is
	   installed, we return true.  In this case, if $module doesn't define a version, or if
	   its version is zero, we return the special value "0 but true", which is numerically
	   zero, but logically true.

	   In general you might prefer to use "check_installed_status" if you need detailed
	   information, or this method if you just need a yes/no answer.

       compare_versions($v1, $op, $v2)
	   [version 0.28]

	   Compares two module versions $v1 and $v2 using the operator $op, which should be one
	   of Perl's numeric operators like "!=" or ">=" or the like.  We do at least a halfway-
	   decent job of handling versions that aren't strictly numeric, like "0.27_02", but
	   exotic stuff will likely cause problems.

	   In the future, the guts of this method might be replaced with a call out to
	   "version.pm".

       config($key)
       config($key, $value)
       config() [deprecated]
	   [version 0.22]

	   With a single argument $key, returns the value associated with that key in the
	   "Config.pm" hash, including any changes the author or user has specified.

	   With $key and $value arguments, sets the value for future callers of "config($key)".

	   With no arguments, returns a hash reference containing all such key-value pairs.  This
	   usage is deprecated, though, because it's a resource hog and violates encapsulation.

       config_data($name)
       config_data($name => $value)
	   [version 0.26]

	   With a single argument, returns the value of the configuration variable $name.  With
	   two arguments, sets the given configuration variable to the given value.  The value
	   may be any Perl scalar that's serializable with "Data::Dumper".  For instance, if you
	   write a module that can use a MySQL or PostgreSQL back-end, you might create
	   configuration variables called "mysql_connect" and "postgres_connect", and set each to
	   an array of connection parameters for "DBI->connect()".

	   Configuration values set in this way using the Module::Build object will be available
	   for querying during the build/test process and after installation via the generated
	   "...::ConfigData" module, as "...::ConfigData->config($name)".

	   The feature() and "config_data()" methods represent Module::Build's main support for
	   configuration of installed modules.	See also "SAVING CONFIGURATION INFORMATION" in
	   Module::Build::Authoring.

       conflicts()
	   [version 0.21]

	   Returns a hash reference indicating the "conflicts" prerequisites that were passed to
	   the "new()" method.

       contains_pod($file) [deprecated]
	   [version 0.20]

	   [Deprecated] Please see Module::Build::ModuleInfo instead.

	   Returns true if the given file appears to contain POD documentation.  Currently this
	   checks whether the file has a line beginning with '=pod', '=head', or '=item', but the
	   exact semantics may change in the future.

       copy_if_modified(%parameters)
	   [version 0.19]

	   Takes the file in the "from" parameter and copies it to the file in the "to"
	   parameter, or the directory in the "to_dir" parameter, if the file has changed since
	   it was last copied (or if it doesn't exist in the new location).  By default the
	   entire directory structure of "from" will be copied into "to_dir"; an optional
	   "flatten" parameter will copy into "to_dir" without doing so.

	   Returns the path to the destination file, or "undef" if nothing needed to be copied.

	   Any directories that need to be created in order to perform the copying will be
	   automatically created.

	   The destination file is set to read-only. If the source file has the executable bit
	   set, then the destination file will be made executable.

       create_build_script()
	   [version 0.05]

	   Creates an executable script called "Build" in the current directory that will be used
	   to execute further user actions.  This script is roughly analogous (in function, not
	   in form) to the Makefile created by "ExtUtils::MakeMaker".  This method also creates
	   some temporary data in a directory called "_build/".  Both of these will be removed
	   when the "realclean" action is performed.

	   Among the files created in "_build/" is a _build/prereqs file containing the set of
	   prerequisites for this distribution, as a hash of hashes.  This file may be
	   "eval()"-ed to obtain the authoritative set of prerequisites, which might be different
	   from the contents of META.yml (because Build.PL might have set them dynamically).  But
	   fancy developers take heed: do not put any fancy custom runtime code in the
	   _build/prereqs file, leave it as a static declaration containing only strings and
	   numbers.  Similarly, do not alter the structure of the internal
	   "$self->{properties}{requires}" (etc.)  data members, because that's where this data
	   comes from.

       current_action()
	   [version 0.28]

	   Returns the name of the currently-running action, such as "build" or "test".  This
	   action is not necessarily the action that was originally invoked by the user.  For
	   example, if the user invoked the "test" action, current_action() would initially
	   return "test".  However, action "test" depends on action "code", so current_action()
	   will return "code" while that dependency is being executed.	Once that action has
	   completed, current_action() will again return "test".

	   If you need to know the name of the original action invoked by the user, see
	   "invoked_action()" below.

       depends_on(@actions)
	   [version 0.28]

	   Invokes the named action or list of actions in sequence.  Using this method is
	   preferred to calling the action explicitly because it performs some internal record-
	   keeping, and it ensures that the same action is not invoked multiple times (note: in
	   future versions of Module::Build it's conceivable that this run-only-once mechanism
	   will be changed to something more intelligent).

	   Note that the name of this method is something of a misnomer; it should really be
	   called something like "invoke_actions_unless_already_invoked()" or something, but for
	   better or worse (perhaps better!) we were still thinking in "make"-like dependency
	   terms when we created this method.

	   See also dispatch().  The main distinction between the two is that "depends_on()" is
	   meant to call an action from inside another action, whereas "dispatch()" is meant to
	   set the very top action in motion.

       dir_contains($first_dir, $second_dir)
	   [version 0.28]

	   Returns true if the first directory logically contains the second directory.  This is
	   just a convenience function because "File::Spec" doesn't really provide an easy way to
	   figure this out (but "Path::Class" does...).

       dispatch($action, %args)
	   [version 0.03]

	   Invokes the build action $action.  Optionally, a list of options and their values can
	   be passed in.  This is equivalent to invoking an action at the command line, passing
	   in a list of options.

	   Custom options that have not been registered must be passed in as a hash reference in
	   a key named "args":

	     $build->dispatch('foo', verbose => 1, args => { my_option => 'value' });

	   This method is intended to be used to programmatically invoke build actions, e.g. by
	   applications controlling Module::Build-based builds rather than by subclasses.

	   See also depends_on().  The main distinction between the two is that "depends_on()" is
	   meant to call an action from inside another action, whereas "dispatch()" is meant to
	   set the very top action in motion.

       dist_dir()
	   [version 0.28]

	   Returns the name of the directory that will be created during the "dist" action.  The
	   name is derived from the "dist_name" and "dist_version" properties.

       dist_name()
	   [version 0.21]

	   Returns the name of the current distribution, as passed to the "new()" method in a
	   "dist_name" or modified "module_name" parameter.

       dist_version()
	   [version 0.21]

	   Returns the version of the current distribution, as determined by the "new()" method
	   from a "dist_version", "dist_version_from", or "module_name" parameter.

       do_system($cmd, @args)
	   [version 0.21]

	   This is a fairly simple wrapper around Perl's "system()" built-in command.  Given a
	   command and an array of optional arguments, this method will print the command to
	   "STDOUT", and then execute it using Perl's "system()".  It returns true or false to
	   indicate success or failure (the opposite of how "system()" works, but more
	   intuitive).

	   Note that if you supply a single argument to "do_system()", it will/may be processed
	   by the system's shell, and any special characters will do their special things.  If
	   you supply multiple arguments, no shell will get involved and the command will be
	   executed directly.

       extra_compiler_flags()
       extra_compiler_flags(@flags)
	   [version 0.25]

	   Set or retrieve the extra compiler flags. Returns an arrayref of flags.

       extra_linker_flags()
       extra_linker_flags(@flags)
	   [version 0.25]

	   Set or retrieve the extra linker flags. Returns an arrayref of flags.

       feature($name)
       feature($name => $value)
	   [version 0.26]

	   With a single argument, returns true if the given feature is set.  With two arguments,
	   sets the given feature to the given boolean value.  In this context, a "feature" is
	   any optional functionality of an installed module.  For instance, if you write a
	   module that could optionally support a MySQL or PostgreSQL backend, you might create
	   features called "mysql_support" and "postgres_support", and set them to true/false
	   depending on whether the user has the proper databases installed and configured.

	   Features set in this way using the Module::Build object will be available for querying
	   during the build/test process and after installation via the generated
	   "...::ConfigData" module, as "...::ConfigData->feature($name)".

	   The "feature()" and "config_data()" methods represent Module::Build's main support for
	   configuration of installed modules.	See also "SAVING CONFIGURATION INFORMATION" in
	   Module::Build::Authoring.

       fix_shebang_line(@files)
	   [version 0.??]

	   Modify any "shebang" line in the specified files to use the path to the perl
	   executable being used for the current build.  Files are modified in-place.  The
	   existing shebang line must have a command that contains ""perl""; arguments to the
	   command do not count.  In particular, this means that the use of "#!/usr/bin/env perl"
	   will not be changed.

	   For an explanation of shebang lines, see
	   <http://en.wikipedia.org/wiki/Shebang_%28Unix%29>.

       have_c_compiler()
	   [version 0.21]

	   Returns true if the current system seems to have a working C compiler.  We currently
	   determine this by attempting to compile a simple C source file and reporting whether
	   the attempt was successful.

       install_base_relpaths()
       install_base_relpaths($type)
       install_base_relpaths($type => $path)
	   [version 0.28]

	   Set or retrieve the relative paths that are appended to "install_base" for any
	   installable element. This is useful if you want to set the relative install path for
	   custom build elements.

	   With no argument, it returns a reference to a hash containing all elements and their
	   respective values. This hash should not be modified directly; use the multiple
	   argument below form to change values.

	   The single argument form returns the value associated with the element $type.

	   The multiple argument form allows you to set the paths for element types.  $value must
	   be a relative path using Unix-like paths.  (A series of directories separated by
	   slashes, e.g. "foo/bar".)  The return value is a localized path based on $value.

	   Assigning the value "undef" to an element causes it to be removed.

       install_destination($type)
	   [version 0.28]

	   Returns the directory in which items of type $type (e.g. "lib", "arch", "bin", or
	   anything else returned by the "install_types()" method) will be installed during the
	   "install" action.  Any settings for "install_path", "install_base", and "prefix" are
	   taken into account when determining the return value.

       install_path()
       install_path($type)
       install_path($type => $path)
	   [version 0.28]

	   Set or retrieve paths for specific installable elements. This is useful when you want
	   to examine any explicit install paths specified by the user on the command line, or if
	   you want to set the install path for a specific installable element based on another
	   attribute like "install_base()".

	   With no argument, it returns a reference to a hash containing all elements and their
	   respective values. This hash should not be modified directly; use the multiple
	   argument below form to change values.

	   The single argument form returns the value associated with the element $type.

	   The multiple argument form allows you to set the paths for element types.  The
	   supplied $path should be an absolute path to install elements of $type.  The return
	   value is $path.

	   Assigning the value "undef" to an element causes it to be removed.

       install_types()
	   [version 0.28]

	   Returns a list of installable types that this build knows about.  These types each
	   correspond to the name of a directory in blib/, and the list usually includes items
	   such as "lib", "arch", "bin", "script", "libdoc", "bindoc", and if HTML documentation
	   is to be built, "libhtml" and "binhtml".  Other user-defined types may also exist.

       invoked_action()
	   [version 0.28]

	   This is the name of the original action invoked by the user.  This value is set when
	   the user invokes Build.PL, the Build script, or programmatically through the
	   dispatch() method.  It does not change as sub-actions are executed as dependencies are
	   evaluated.

	   To get the name of the currently executing dependency, see "current_action()" above.

       notes()
       notes($key)
       notes($key => $value)
	   [version 0.20]

	   The "notes()" value allows you to store your own persistent information about the
	   build, and to share that information among different entities involved in the build.
	   See the example in the "current()" method.

	   The "notes()" method is essentially a glorified hash access.  With no arguments,
	   "notes()" returns the entire hash of notes.	With one argument, "notes($key)" returns
	   the value associated with the given key.  With two arguments, "notes($key, $value)"
	   sets the value associated with the given key to $value and returns the new value.

	   The lifetime of the "notes" data is for "a build" - that is, the "notes" hash is
	   created when "perl Build.PL" is run (or when the "new()" method is run, if the
	   Module::Build Perl API is being used instead of called from a shell), and lasts until
	   "perl Build.PL" is run again or the "clean" action is run.

       orig_dir()
	   [version 0.28]

	   Returns a string containing the working directory that was in effect before the Build
	   script chdir()-ed into the "base_dir".  This might be useful for writing wrapper tools
	   that might need to chdir() back out.

       os_type()
	   [version 0.04]

	   If you're subclassing Module::Build and some code needs to alter its behavior based on
	   the current platform, you may only need to know whether you're running on Windows,
	   Unix, MacOS, VMS, etc., and not the fine-grained value of Perl's $^O variable.  The
	   "os_type()" method will return a string like "Windows", "Unix", "MacOS", "VMS", or
	   whatever is appropriate.  If you're running on an unknown platform, it will return
	   "undef" - there shouldn't be many unknown platforms though.

       is_vmsish()
       is_windowsish()
       is_unixish()
	   Convenience functions that return a boolean value indicating whether this platform
	   behaves respectively like VMS, Windows, or Unix.  For arbitrary reasons other
	   platforms don't get their own such functions, at least not yet.

       prefix_relpaths()
       prefix_relpaths($installdirs)
       prefix_relpaths($installdirs, $type)
       prefix_relpaths($installdirs, $type => $path)
	   [version 0.28]

	   Set or retrieve the relative paths that are appended to "prefix" for any installable
	   element.  This is useful if you want to set the relative install path for custom build
	   elements.

	   With no argument, it returns a reference to a hash containing all elements and their
	   respective values as defined by the current "installdirs" setting.

	   With a single argument, it returns a reference to a hash containing all elements and
	   their respective values as defined by $installdirs.

	   The hash returned by the above calls should not be modified directly; use the three-
	   argument below form to change values.

	   The two argument form returns the value associated with the element $type.

	   The multiple argument form allows you to set the paths for element types.  $value must
	   be a relative path using Unix-like paths.  (A series of directories separated by
	   slashes, e.g. "foo/bar".)  The return value is a localized path based on $value.

	   Assigning the value "undef" to an element causes it to be removed.

       get_metadata()
	   [version 0.36]

	   This method returns a hash reference of metadata that can be used to create a YAML
	   datastream. It is provided for authors to override or customize the fields of
	   META.yml.   E.g.

	     package My::Builder;
	     use base 'Module::Build';

	     sub get_metadata {
	       my $self, @args = @_;
	       my $data = $self->SUPER::get_metadata(@args);
	       $data->{custom_field} = 'foo';
	       return $data;
	     }

	   Valid arguments include:

	   o   "fatal" -- indicates whether missing required metadata fields should be a fatal
	       error or not.  For META creation, it generally should, but for MYMETA creation for
	       end-users, it should not be fatal.

	   o   "auto" -- indicates whether any necessary configure_requires should be
	       automatically added.  This is used in META creation.

	   This method is a wrapper around the old prepare_metadata API now that we no longer use
	   YAML::Node to hold metadata.

       prepare_metadata() [deprecated]
	   [version 0.36]

	   [Deprecated] As of 0.36, authors should use "get_metadata" instead.	This method is
	   preserved for backwards compatibility only.

	   It takes three positional arguments: a hashref (to which metadata will be added), an
	   optional arrayref (to which metadata keys will be added in order if the arrayref
	   exists), and a hashref of arguments (as provided to get_metadata).  The latter
	   argument is new as of 0.36.	Earlier versions are always fatal on errors.

	   Prior to version 0.36, this method took a YAML::Node as an argument to hold assembled
	   metadata.

       prereq_failures()
	   [version 0.11]

	   Returns a data structure containing information about any failed prerequisites (of any
	   of the types described above), or "undef" if all prerequisites are met.

	   The data structure returned is a hash reference.  The top level keys are the type of
	   prerequisite failed, one of "requires", "build_requires", "conflicts", or
	   "recommends".  The associated values are hash references whose keys are the names of
	   required (or conflicting) modules.  The associated values of those are hash references
	   indicating some information about the failure.  For example:

	     {
	      have => '0.42',
	      need => '0.59',
	      message => 'Version 0.42 is installed, but we need version 0.59',
	     }

	   or

	     {
	      have => '<none>',
	      need => '0.59',
	      message => 'Prerequisite Foo isn't installed',
	     }

	   This hash has the same structure as the hash returned by the
	   "check_installed_status()" method, except that in the case of "conflicts" dependencies
	   we change the "need" key to "conflicts" and construct a proper message.

	   Examples:

	     # Check a required dependency on Foo::Bar
	     if ( $build->prereq_failures->{requires}{Foo::Bar} ) { ...

	     # Check whether there were any failures
	     if ( $build->prereq_failures ) { ...

	     # Show messages for all failures
	     my $failures = $build->prereq_failures;
	     while (my ($type, $list) = each %$failures) {
	       while (my ($name, $hash) = each %$list) {
		 print "Failure for $name: $hash->{message}\n";
	       }
	     }

       prereq_data()
	   [version 0.32]

	   Returns a reference to a hash describing all prerequisites.	The keys of the hash will
	   be the various prerequisite types ('requires', 'build_requires', 'test_requires',
	   'configure_requires', 'recommends', or 'conflicts') and the values will be references
	   to hashes of module names and version numbers.  Only prerequisites types that are
	   defined will be included.  The "prereq_data" action is just a thin wrapper around the
	   "prereq_data()" method and dumps the hash as a string that can be loaded using
	   "eval()".

       prereq_report()
	   [version 0.28]

	   Returns a human-readable (table-form) string showing all prerequisites, the versions
	   required, and the versions actually installed.  This can be useful for reviewing the
	   configuration of your system prior to a build, or when compiling data to send for a
	   bug report.	The "prereq_report" action is just a thin wrapper around the
	   "prereq_report()" method.

       prompt($message, $default)
	   [version 0.12]

	   Asks the user a question and returns their response as a string.  The first argument
	   specifies the message to display to the user (for example, "Where do you keep your
	   money?").  The second argument, which is optional, specifies a default answer (for
	   example, "wallet").	The user will be asked the question once.

	   If "prompt()" detects that it is not running interactively and there is nothing on
	   STDIN or if the PERL_MM_USE_DEFAULT environment variable is set to true, the $default
	   will be used without prompting.

	   To prevent automated processes from blocking, the user must either set
	   PERL_MM_USE_DEFAULT or attach something to STDIN (this can be a pipe/file containing a
	   scripted set of answers or /dev/null.)

	   If no $default is provided an empty string will be used instead.  In non-interactive
	   mode, the absence of $default is an error (though explicitly passing "undef()" as the
	   default is valid as of 0.27.)

	   This method may be called as a class or object method.

       recommends()
	   [version 0.21]

	   Returns a hash reference indicating the "recommends" prerequisites that were passed to
	   the "new()" method.

       requires()
	   [version 0.21]

	   Returns a hash reference indicating the "requires" prerequisites that were passed to
	   the "new()" method.

       rscan_dir($dir, $pattern)
	   [version 0.28]

	   Uses "File::Find" to traverse the directory $dir, returning a reference to an array of
	   entries matching $pattern.  $pattern may either be a regular expression (using "qr//"
	   or just a plain string), or a reference to a subroutine that will return true for
	   wanted entries.  If $pattern is not given, all entries will be returned.

	   Examples:

	    # All the *.pm files in lib/
	    $m->rscan_dir('lib', qr/\.pm$/)

	    # All the files in blib/ that aren't *.html files
	    $m->rscan_dir('blib', sub {-f $_ and not /\.html$/});

	    # All the files in t/
	    $m->rscan_dir('t');

       runtime_params()
       runtime_params($key)
	   [version 0.28]

	   The "runtime_params()" method stores the values passed on the command line for valid
	   properties (that is, any command line options for which "valid_property()" returns a
	   true value).  The value on the command line may override the default value for a
	   property, as well as any value specified in a call to "new()".  This allows you to
	   programmatically tell if "perl Build.PL" or any execution of "./Build" had command
	   line options specified that override valid properties.

	   The "runtime_params()" method is essentially a glorified read-only hash.  With no
	   arguments, "runtime_params()" returns the entire hash of properties specified on the
	   command line.  With one argument, "runtime_params($key)" returns the value associated
	   with the given key.

	   The lifetime of the "runtime_params" data is for "a build" - that is, the
	   "runtime_params" hash is created when "perl Build.PL" is run (or when the "new()"
	   method is called, if the Module::Build Perl API is being used instead of called from a
	   shell), and lasts until "perl Build.PL" is run again or the "clean" action is run.

       script_files()
	   [version 0.18]

	   Returns a hash reference whose keys are the perl script files to be installed, if any.
	   This corresponds to the "script_files" parameter to the "new()" method.  With an
	   optional argument, this parameter may be set dynamically.

	   For backward compatibility, the "scripts()" method does exactly the same thing as
	   "script_files()".  "scripts()" is deprecated, but it will stay around for several
	   versions to give people time to transition.

       up_to_date($source_file, $derived_file)
       up_to_date(\@source_files, \@derived_files)
	   [version 0.20]

	   This method can be used to compare a set of source files to a set of derived files.
	   If any of the source files are newer than any of the derived files, it returns false.
	   Additionally, if any of the derived files do not exist, it returns false.  Otherwise
	   it returns true.

	   The arguments may be either a scalar or an array reference of file names.

       y_n($message, $default)
	   [version 0.12]

	   Asks the user a yes/no question using "prompt()" and returns true or false
	   accordingly.  The user will be asked the question repeatedly until they give an answer
	   that looks like "yes" or "no".

	   The first argument specifies the message to display to the user (for example, "Shall I
	   invest your money for you?"), and the second argument specifies the default answer
	   (for example, "y").

	   Note that the default is specified as a string like "y" or "n", and the return value
	   is a Perl boolean value like 1 or 0.  I thought about this for a while and this seemed
	   like the most useful way to do it.

	   This method may be called as a class or object method.

   Autogenerated Accessors
       In addition to the aforementioned methods, there are also some get/set accessor methods
       for the following properties:

       PL_files()
       allow_mb_mismatch()
       allow_pureperl()
       auto_configure_requires()
       autosplit()
       base_dir()
       bindoc_dirs()
       blib()
       build_bat()
       build_class()
       build_elements()
       build_requires()
       build_script()
       bundle_inc()
       bundle_inc_preload()
       c_source()
       config_dir()
       configure_requires()
       conflicts()
       cpan_client()
       create_license()
       create_makefile_pl()
       create_packlist()
       create_readme()
       debug()
       debugger()
       destdir()
       dynamic_config()
       get_options()
       html_css()
       include_dirs()
       install_base()
       installdirs()
       libdoc_dirs()
       license()
       magic_number()
       mb_version()
       meta_add()
       meta_merge()
       metafile()
       metafile2()
       module_name()
       mymetafile()
       mymetafile2()
       needs_compiler()
       orig_dir()
       perl()
       pm_files()
       pod_files()
       pollute()
       prefix()
       prereq_action_types()
       program_name()
       pureperl_only()
       quiet()
       recommends()
       recurse_into()
       recursive_test_files()
       requires()
       scripts()
       sign()
       tap_harness_args()
       test_file_exts()
       test_requires()
       use_rcfile()
       use_tap_harness()
       verbose()
       xs_files()

MODULE METADATA
       If you would like to add other useful metadata, "Module::Build" supports this with the
       "meta_add" and "meta_merge" arguments to "new()". The authoritative list of supported
       metadata can be found at CPAN::META::Spec but for convenience - here are a few of the more
       useful ones:

       keywords
	   For describing the distribution using keyword (or "tags") in order to make CPAN.org
	   indexing and search more efficient and useful.

       resources
	   A list of additional resources available for users of the distribution. This can
	   include links to a homepage on the web, a bug tracker, the repository location, and
	   even a subscription page for the distribution mailing list.

AUTHOR
       Ken Williams <kwilliams@cpan.org>

COPYRIGHT
       Copyright (c) 2001-2006 Ken Williams.  All rights reserved.

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

SEE ALSO
       perl(1), Module::Build(3), Module::Build::Authoring(3), Module::Build::Cookbook(3),
       ExtUtils::MakeMaker(3)

       META.yml Specification: CPAN::META::Spec

perl v5.16.3				    2014-06-10			    Module::Build::API(3)
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