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lib/Alien/Build/Plugin/Probe/CBuilder.pm  view on Meta::CPAN

package Alien::Build::Plugin::Probe::CBuilder;

use strict;
use warnings;
use 5.008004;
use Alien::Build::Plugin;
use File::chdir;
use File::Temp ();
use Capture::Tiny qw( capture_merged capture );
use Alien::Util qw( version_cmp );

# ABSTRACT: Probe for system libraries by guessing with ExtUtils::CBuilder
our $VERSION = '2.84'; # VERSION


has options => sub { {} };


has cflags  => '';


has libs    => '';


has program => 'int main(int argc, char *argv[]) { return 0; }';


has version => undef;


has 'atleast_version' => undef;


has aliens => [];


has lang => 'C';

sub init
{
  my($self, $meta) = @_;

  $meta->add_requires('configure' => 'ExtUtils::CBuilder' => 0 );

  if(@{ $self->aliens })
  {
    die "You can't specify both 'aliens' and either 'cflags' or 'libs' for the Probe::CBuilder plugin" if $self->cflags || $self->libs;

    $meta->add_requires('configure' => $_ => 0 ) for @{ $self->aliens };
    $meta->add_requires('Alien::Build::Plugin::Probe::CBuilder' => '0.53');

    my $cflags = '';
    my $libs   = '';
    foreach my $alien (@{ $self->aliens })
    {
      my $pm = "$alien.pm";
      $pm =~ s/::/\//g;
      require $pm;
      $cflags .= $alien->cflags . ' ';
      $libs   .= $alien->libs   . ' ';
    }
    $self->cflags($cflags);
    $self->libs($libs);
  }

  my @cpp;

  if($self->lang ne 'C')
  {
    $meta->add_requires('Alien::Build::Plugin::Probe::CBuilder' => '0.53');
    @cpp = ('C++' => 1) if $self->lang eq 'C++';
  }

lib/Alien/Build/Plugin/Probe/CBuilder.pm  view on Meta::CPAN

        die $error;
      }

      my($out, $err, $ret) = capture { system($^O eq 'MSWin32' ? $exe : "./$exe") };
      die "execute failed" if $ret;

      my $cflags = $self->cflags;
      my $libs   = $self->libs;

      $cflags =~ s{\s*$}{ };
      $libs =~ s{\s*$}{ };

      $build->install_prop->{plugin_probe_cbuilder_gather}->{$self->instance_id} = {
        cflags  => $cflags,
        libs    => $libs,
      };

      if(defined $self->version)
      {
        my($version) = $out =~ $self->version;
        if (defined $self->atleast_version)
        {
          if(version_cmp ($version, $self->atleast_version) < 0)
          {
            die "CBuilder probe found version $version, but at least @{[ $self->atleast_version ]} is required.";
          }
        }
        $build->hook_prop->{version} = $version;
        $build->install_prop->{plugin_probe_cbuilder_gather}->{$self->instance_id}->{version} = $version;
      }

      'system';
    }
  );

  $meta->register_hook(
    gather_system => sub {
      my($build) = @_;

      return if $build->hook_prop->{name} eq 'gather_system'
      &&        ($build->install_prop->{system_probe_instance_id} || '') ne $self->instance_id;

      if(my $p = $build->install_prop->{plugin_probe_cbuilder_gather}->{$self->instance_id})
      {
        $build->runtime_prop->{$_} = $p->{$_} for keys %$p;
      }
    },
  );
}

1;

__END__

=pod

=encoding UTF-8

=head1 NAME

Alien::Build::Plugin::Probe::CBuilder - Probe for system libraries by guessing with ExtUtils::CBuilder

=head1 VERSION

version 2.84

=head1 SYNOPSIS

 use alienfile;
 plugin 'Probe::CBuilder' => (
   cflags => '-I/opt/libfoo/include',
   libs   => '-L/opt/libfoo/lib -lfoo',
 );

alternately:

 ues alienfile;
 plugin 'Probe::CBuilder' => (
   aliens => [ 'Alien::libfoo', 'Alien::libbar' ],
 );

=head1 DESCRIPTION

This plugin probes for compiler and linker flags using L<ExtUtils::CBuilder>.  This is a useful
alternative to L<Alien::Build::Plugin::PkgConfig::Negotiate> for packages that do not provide
a pkg-config C<.pc> file, or for when those C<.pc> files may not be available.  (For example,
on FreeBSD, C<libarchive> is a core part of the operating system, but doesn't include a C<.pc>
file which is usually provided when you install the C<libarchive> package on Linux).

=head1 PROPERTIES

=head2 options

Any extra options that you want to have passed into the constructor to L<ExtUtils::CBuilder>.

=head2 cflags

The compiler flags.

=head2 libs

The linker flags

=head2 program

The program to use in the test.

=head2 version

This is a regular expression to parse the version out of the output from the
test program.

=head2 atleast_version

The minimum required version as provided by the system.

=head2 aliens

List of aliens to query fro compiler and linker flags.

=head2 lang