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129 lines
5.1 KiB
129 lines
5.1 KiB
// -*- mode:doc; -*-
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// vim: set syntax=asciidoc:
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=== Infrastructure for Perl/CPAN packages
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[[perl-package-tutorial]]
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==== +perl-package+ tutorial
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First, let's see how to write a +.mk+ file for a Perl/CPAN package,
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with an example :
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------------------------
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01: ################################################################################
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02: #
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03: # perl-foo-bar
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04: #
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05: ################################################################################
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06:
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07: PERL_FOO_BAR_VERSION = 0.02
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08: PERL_FOO_BAR_SOURCE = Foo-Bar-$(PERL_FOO_BAR_VERSION).tar.gz
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09: PERL_FOO_BAR_SITE = $(BR2_CPAN_MIRROR)/authors/id/M/MO/MONGER
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10: PERL_FOO_BAR_DEPENDENCIES = perl-strictures
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11: PERL_FOO_BAR_LICENSE = Artistic or GPL-1.0+
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12: PERL_FOO_BAR_LICENSE_FILES = LICENSE
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13: PERL_FOO_BAR_DISTNAME = Foo-Bar
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14:
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15: $(eval $(perl-package))
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------------------------
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On line 7, we declare the version of the package.
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On line 8 and 9, we declare the name of the tarball and the location
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of the tarball on a CPAN server. Buildroot will automatically download
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the tarball from this location.
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On line 10, we declare our dependencies, so that they are built
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before the build process of our package starts.
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On line 11 and 12, we give licensing details about the package (its
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license on line 11, and the file containing the license text on line
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12).
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On line 13, the name of the distribution as needed by the script
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+utils/scancpan+ (in order to regenerate/upgrade these package files).
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Finally, on line 15, we invoke the +perl-package+ macro that
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generates all the Makefile rules that actually allow the package to be
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built.
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Most of these data can be retrieved from https://metacpan.org/.
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So, this file and the Config.in can be generated by running
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the script +utils/scancpan Foo-Bar+ in the Buildroot directory
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(or in a br2-external tree).
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This script creates a Config.in file and foo-bar.mk file for the
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requested package, and also recursively for all dependencies specified by
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CPAN. You should still manually edit the result. In particular, the
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following things should be checked.
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* If the perl module links with a shared library that is provided by
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another (non-perl) package, this dependency is not added automatically.
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It has to be added manually to +PERL_FOO_BAR_DEPENDENCIES+.
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* The +package/Config.in+ file has to be updated manually to include the
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generated Config.in files. As a hint, the +scancpan+ script prints out
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the required +source "..."+ statements, sorted alphabetically.
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[[perl-package-reference]]
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==== +perl-package+ reference
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As a policy, packages that provide Perl/CPAN modules should all be
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named +perl-<something>+ in Buildroot.
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This infrastructure handles various Perl build systems :
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+ExtUtils-MakeMaker+ (EUMM), +Module-Build+ (MB) and +Module-Build-Tiny+.
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+Build.PL+ is preferred by default when a package provides a +Makefile.PL+
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and a +Build.PL+.
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The main macro of the Perl/CPAN package infrastructure is
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+perl-package+. It is similar to the +generic-package+ macro. The ability to
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have target and host packages is also available, with the
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+host-perl-package+ macro.
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Just like the generic infrastructure, the Perl/CPAN infrastructure
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works by defining a number of variables before calling the
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+perl-package+ macro.
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First, all the package metadata information variables that exist in the
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generic infrastructure also exist in the Perl/CPAN infrastructure:
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+PERL_FOO_VERSION+, +PERL_FOO_SOURCE+,
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+PERL_FOO_PATCH+, +PERL_FOO_SITE+,
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+PERL_FOO_SUBDIR+, +PERL_FOO_DEPENDENCIES+,
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+PERL_FOO_INSTALL_TARGET+.
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Note that setting +PERL_FOO_INSTALL_STAGING+ to +YES+ has no effect
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unless a +PERL_FOO_INSTALL_STAGING_CMDS+ variable is defined. The perl
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infrastructure doesn't define these commands since Perl modules generally
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don't need to be installed to the +staging+ directory.
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A few additional variables, specific to the Perl/CPAN infrastructure,
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can also be defined. Many of them are only useful in very specific
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cases, typical packages will therefore only use a few of them.
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* +PERL_FOO_PREFER_INSTALLER+/+HOST_PERL_FOO_PREFER_INSTALLER+,
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specifies the preferred installation method. Possible values are
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+EUMM+ (for +Makefile.PL+ based installation using
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+ExtUtils-MakeMaker+) and +MB+ (for +Build.PL+ based installation
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using +Module-Build+). This variable is only used when the package
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provides both installation methods.
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* +PERL_FOO_CONF_ENV+/+HOST_PERL_FOO_CONF_ENV+, to specify additional
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environment variables to pass to the +perl Makefile.PL+ or +perl Build.PL+.
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By default, empty.
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* +PERL_FOO_CONF_OPTS+/+HOST_PERL_FOO_CONF_OPTS+, to specify additional
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configure options to pass to the +perl Makefile.PL+ or +perl Build.PL+.
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By default, empty.
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* +PERL_FOO_BUILD_OPTS+/+HOST_PERL_FOO_BUILD_OPTS+, to specify additional
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options to pass to +make pure_all+ or +perl Build build+ in the build step.
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By default, empty.
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* +PERL_FOO_INSTALL_TARGET_OPTS+, to specify additional options to
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pass to +make pure_install+ or +perl Build install+ in the install step.
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By default, empty.
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* +HOST_PERL_FOO_INSTALL_OPTS+, to specify additional options to
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pass to +make pure_install+ or +perl Build install+ in the install step.
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By default, empty.
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