NAME

ExtUtils::MakeMaker::Attributes - Determine when ExtUtils::MakeMaker attributes are available

SYNOPSIS

  use ExtUtils::MakeMaker::Attributes ':all';
  
  my @eumm_available = eumm_version_supported_attributes(ExtUtils::MakeMaker->VERSION);
  my @core_available = perl_version_supported_attributes($]);
  
  unless (perl_version_supports_attribute('v5.10.1', 'TEST_REQUIRES')) {
    ...
  }
  
  my $fallback = eumm_attribute_fallback('TEST_REQUIRES');
  my $required_eumm = eumm_attribute_requires_version('TEST_REQUIRES');
  unless (eval { ExtUtils::MakeMaker->VERSION($required_eumm); 1 }) {
    ...
  }

DESCRIPTION

This module provides an API to determine what attributes are available to a particular version of ExtUtils::MakeMaker, and conversely, what version of ExtUtils::MakeMaker is required for a particular attribute. See "Using Attributes and Parameters" in ExtUtils::MakeMaker for more details on the available attributes.

FUNCTIONS

All functions are exported on demand, and can be exported individually or via the :all tag.

known_eumm_attributes

  my @attributes = known_eumm_attributes;

Returns a list of attributes known to be accepted by the latest version of ExtUtils::MakeMaker.

is_known_eumm_attribute

  my $boolean = is_known_eumm_attribute($attribute);

Returns a boolean whether the attribute is known to be accepted by the latest version of ExtUtils::MakeMaker.

eumm_attribute_requires_version

  my $version = eumm_attribute_requires_version($attribute);

Returns the minimum version of ExtUtils::MakeMaker that accepts the attribute.

eumm_attribute_fallback

  my $hashref = eumm_attribute_fallback($attribute);

In cases where the active version of ExtUtils::MakeMaker does not support an attribute, the attribute should be deleted from the options passed to WriteMakefile. However, some attributes may still be useful in other ways, as indicated by this function. If the attribute has an associated fallback method, it returns a hashref containing a method and possibly other related keys. Otherwise, it returns undef. Currently it may return these methods:

merge_prereqs

The key's contents (as a hashref of prerequisites) should be merged into the merge_target (returned in the fallback hashref), ideally using "add_requirements" in CPAN::Meta::Requirements.

eumm_version_supports_attribute

  my $boolean = eumm_version_supports_attribute($attribute, $eumm_version);

Returns a boolean whether the ExtUtils::MakeMaker supports the attribute at the specified version.

perl_version_supports_attribute

  my $boolean = perl_version_supports_attribute($attribute, $perl_version);

Returns a boolean whether the version of ExtUtils::MakeMaker shipped in the specified version of Perl supports the attribute.

eumm_version_supported_attributes

  my @attributes = eumm_version_supported_attributes($eumm_version);

Returns a list of all attributes supported by the specified version of ExtUtils::MakeMaker.

perl_version_supported_attributes

  my @attributes = perl_version_supported_attributes($perl_version);

Returns a list of all attributes supported by the version of ExtUtils::MakeMaker shipped in the specified version of Perl.

BUGS

Report any issues on the public bugtracker.

AUTHOR

Dan Book <dbook@cpan.org>

COPYRIGHT AND LICENSE

This software is Copyright (c) 2017 by Dan Book.

This is free software, licensed under:

  The Artistic License 2.0 (GPL Compatible)

SEE ALSO

ExtUtils::MakeMaker