Update dh_auto documentation.

* dh_auto.pod -> dh_auto.7 - contains general information about dh_auto,
  its features, build systems supported by default (the latter is injected by
  man/dh_auto_pod script from Debian/Debhelper/Buildsystem/*.pm PODs via
  placeholders (#PLACEHOLDER#))
* POD in Debian/Debhelper/Buildsystem/*.pm -> dh_auto_<buildsystem>.7 - build
  system specific information.
* dh_auto_* -> dh_auto_*.1 - relatively shorty description of the specific
  dh_auto_* program and build system specific info for that step injected from
  Debian/Debhelper/Buildsystem/*.pm with man/dh_auto_pod script.
* man/dh_auto_pod $step - generates full dh_auto_$step POD (replaces
  placeholders).
* man/dh_auto_pod - generates full dh_auto.pod (replaces placeholders).

Signed-off-by: Modestas Vainius <modestas@vainius.eu>

1 files changed, 123 insertions, 0 deletions

diff --git a/Debian/Debhelper/Buildsystem/perl_build.pm b/Debian/Debhelper/Buildsystem/perl_build.pm
index 3567cb1a..26210152 100644
--- a/Debian/Debhelper/Buildsystem/perl_build.pm
+++ b/Debian/Debhelper/Buildsystem/perl_build.pm
@@ -6,6 +6,32 @@
 
 package Debian::Debhelper::Buildsystem::perl_build;
 
+=head1 NAME
+
+B<perl_build> - Perl Module::Build (Build.PL)
+
+=head1 SYNOPSIS
+
+B<dh_auto_*> [B<--buildsystem>=I<perl_build>] ...
+
+=head1 DESCRIPTION
+
+Module::Build is a system for building, testing, and installing Perl modules.
+It does not require a C<make> on your system - most of the Module::Build code is
+pure-perl and written in a very cross-platform way. Its only prerequisites are
+modules that are included with perl 5.6.0. Typically, Module::Build build system
+can be identified by presence of the F<Build.PL> script in the source
+directory.
+
+=head1 DH_AUTO NOTES
+
+Out of source tree building is not supported. C<MODULEBUILDRC=/dev/null>
+environment variable is exported in each building step.
+
+=head1 BUILD PROCESS
+
+=cut
+
 use strict;
 use base 'Debian::Debhelper::Buildsystem';
 
@@ -37,31 +63,128 @@ sub new {
 	return $this;
 }
 
+=head2 Configure step
+
+=over 4
+
+=item I<Behaviour>
+
+Execute C<perl Build.PL> passing C<installdirs=vendor> parameter by default.
+Environment variable C<PERL_MM_USE_DEFAULT> is set before running the script.
+
+=item I<Auto-selection>
+
+If F<configure>, F<Makefile.PL>, F<setup.py> do not exist, but F<Build.PL>
+exists in the source directory.
+
+=back
+
+=cut
 sub configure {
 	my $this=shift;
 	$ENV{PERL_MM_USE_DEFAULT}=1;
 	$this->do_perl("Build.PL", "installdirs=vendor", @_);
 }
 
+=head2 Build step
+
+=over 4
+
+=item I<Behaviour>
+
+Execute C<perl Build>.
+
+=item I<Auto-selection>
+
+If F<Makefile>, F<makefile>, F<GNUmakefile> (build directory) and F<setup.py>
+(source directory) do not exist, but F<Build.PL> and F<Build> files exist in
+the source directory.
+
+=back
+
+=cut
 sub build {
 	my $this=shift;
 	$this->do_perl("Build", @_);
 }
 
+=head2 Test step
+
+=over 4
+
+=item I<Behaviour>
+
+Execute C<perl Build test>.
+
+=item I<Auto-selection>
+
+If F<Makefile>, F<makefile>, F<GNUmakefile> (build directory) and F<setup.py>
+(source directory) do not exist, but F<Build.PL> and F<Build> files exist in
+the source directory.
+
+=back
+
+=cut
 sub test {
 	my $this=shift;
 	$this->do_perl("Build", "test", @_);
 }
 
+=head2 Install step
+
+=over 4
+
+=item I<Behaviour>
+
+Execute C<perl Build install destdir=$destdir create_packlist=0>. $destdir is
+the path to the temporary installation directory (see L<dh_auto_install(1)>).
+
+=item I<Auto-selection>
+
+If F<Makefile>, F<makefile>, F<GNUmakefile> (build directory) and F<setup.py>
+(source directory) do not exist, but F<Build.PL> and F<Build> files exist in
+the source directory.
+
+=back
+
+=cut
 sub install {
 	my $this=shift;
 	my $destdir=shift;
 	$this->do_perl("Build", "install", "destdir=$destdir", "create_packlist=0", @_);
 }
 
+=head2 Clean step
+
+=over 4
+
+=item I<Behaviour>
+
+Execute C<perl Build --allow_mb_mismatch 1 distclean>.
+
+=item I<Auto-selection>
+
+If F<Makefile>, F<makefile>, F<GNUmakefile> (build directory) and F<setup.py>
+(source directory) do not exist, but F<Build.PL> and F<Build> files exist in
+the source directory.
+
+=back
+
+=cut
 sub clean {
 	my $this=shift;
 	$this->do_perl("Build", "--allow_mb_mismatch", 1, "distclean", @_);
 }
 
+=head1 SEE ALSO
+
+L<dh_auto(7)>
+
+=head1 AUTHORS
+
+ Joey Hess <joeyh@debian.org>
+ Modestas Vainius <modestas@vainius.eu>
+
+=cut
+
 1;