File: WithXSpp.pm

package info (click to toggle)
libmodule-build-withxspp-perl 0.14-3
  • links: PTS, VCS
  • area: main
  • in suites: bullseye, sid, stretch
  • size: 144 kB
  • ctags: 38
  • sloc: perl: 376; makefile: 2
file content (784 lines) | stat: -rw-r--r-- 22,629 bytes parent folder | download
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
package Module::Build::WithXSpp;
use strict;
use warnings;

use File::Spec;
use Module::Build;
use ExtUtils::CppGuess ();

our @ISA = qw(Module::Build);
our $VERSION = '0.14';

# TODO
# - configurable set of xsp and xspt files (and XS typemaps?)
#   => works via directories for now.
# - configurable includes/C-preamble for the XS?
#   => Works in the .xsp files, but the order of XS++ inclusion
#      is undefined.
# - configurable C++ source folder(s) (works, needs docs)
#   => to be documented another time. This is really not a feature that
#      should be commonly used.

sub new {
  my $proto = shift;
  my $class = ref($proto) || $proto;
  my %args = @_;

  # This gives us the correct settings for the C++ compile (hopefully)
  my $guess = ExtUtils::CppGuess->new();
  if (defined $args{extra_compiler_flags}) {
    if (ref($args{extra_compiler_flags})) {
      $guess->add_extra_compiler_flags($_) for @{$args{extra_compiler_flags}};
    }
    else {
      $guess->add_extra_compiler_flags($args{extra_compiler_flags})
    }
    delete $args{extra_compiler_flags};
  }

  if (defined $args{extra_linker_flags}) {
    if (ref($args{extra_linker_flags})) {
      $guess->add_extra_linker_flags($_) for @{$args{extra_linker_flags}};
    }
    else {
      $guess->add_extra_linker_flags($args{extra_linker_flags})
    }
    delete $args{extra_linker_flags};
  }

  # add the typemap modules to the build dependencies
  my $build_requires = $args{build_requires}||{};
  my $extra_typemap_modules = $args{extra_typemap_modules}||{};
  # FIXME: This prevents any potential subclasses from fudging with the extra typemaps?
  foreach my $module (keys %$extra_typemap_modules) {
    if (not defined $build_requires->{$module}
        or defined($extra_typemap_modules->{$module})
           && $build_requires->{$module} < $extra_typemap_modules->{$module})
    {
      $build_requires->{$module} = $extra_typemap_modules->{$module};
    }
  }
  $args{build_requires} = $build_requires;

  # Construct object using C++ options guess
  my $self = $class->SUPER::new(
    %args,
    $guess->module_build_options # FIXME find a way to let the user override this
  );

  push @{$self->extra_compiler_flags},
    map "-I$_",
    (@{$self->cpp_source_dirs||[]}, $self->build_dir);

  $self->_init(\%args);

  return $self;
}

sub _init {
  my $self = shift;
  my $args = shift;
}

sub auto_require {
  my ($self) = @_;
  my $p = $self->{properties};

  if ($self->dist_name ne 'Module-Build-WithXSpp'
      and $self->auto_configure_requires)
  {
    if (not exists $p->{configure_requires}{'Module::Build::WithXSpp'}) {
      (my $ver = $VERSION) =~ s/^(\d+\.\d\d).*$/$1/; # last major release only
      $self->_add_prereq('configure_requires', 'Module::Build::WithXSpp', $ver);
    }
    if (not exists $p->{configure_requires}{'ExtUtils::CppGuess'}) {
      (my $ver = $ExtUtils::CppGuess::VERSION) =~ s/^(\d+\.\d\d).*$/$1/; # last major release only
      $self->_add_prereq('configure_requires', 'ExtUtils::CppGuess', $ver);
    }
    if (not exists $p->{build_requires}{'ExtUtils::CppGuess'}
        and eval("require ExtUtils::XSpp;")
        and defined $ExtUtils::XSpp::VERSION)
    {
      (my $ver = $ExtUtils::XSpp::VERSION) =~ s/^(\d+\.\d\d).*$/$1/; # last major release only
      $self->_add_prereq('build_requires', 'ExtUtils::XSpp', $ver);
    }
  }

  $self->SUPER::auto_require();

  return;
}

sub ACTION_create_buildarea {
  my $self = shift;
  mkdir($self->build_dir);
  $self->add_to_cleanup($self->build_dir);
}

sub ACTION_code {
  my $self = shift;
  $self->depends_on('create_buildarea');
  $self->depends_on('generate_typemap');
  $self->depends_on('generate_main_xs');

  my $files = {};
  foreach my $file (@{$self->cpp_source_files}) {
    $files->{$file} = undef;
  }

  foreach my $ext (qw(c cc cxx cpp C)) {
    foreach my $dir (@{$self->cpp_source_dirs||[]}) {
      my $this = $self->_find_file_by_type($ext, $dir);
      $files = $self->_merge_hashes($files, $this);
    }
  }

  my @objects;
  foreach my $file (keys %$files) {
    my $obj = $self->compile_c($file);
    push @objects, $obj;
    $self->add_to_cleanup($obj);
  }

  $self->{properties}{objects} ||= [];
  push @{$self->{properties}{objects}}, @objects;

  return $self->SUPER::ACTION_code(@_);
}

# I guess I should use a module here.
sub _naive_shell_escape {
  my $s = shift;
  $s =~ s/\\/\\\\/g;
  $s =~ s/"/\\"/g;
  $s
}

sub ACTION_generate_main_xs {
  my $self = shift;

  my $xs_files = $self->find_xs_files;
  my $main_xs_file = File::Spec->catfile($self->build_dir, 'main.xs');

  if (keys(%$xs_files) > 1) {
    # user knows what she's doing, do not generate XS
    $self->log_info("Found custom XS files. Not auto-generating main XS file...\n");
    return 1;
  }

  my $xsp_files = $self->find_xsp_files;
  my $xspt_files = $self->find_xsp_typemaps;

  my $newest = $self->_calc_newest(
    keys(%$xsp_files),
    keys(%$xspt_files),
    'Build.PL',
    # Commented out: Do not include generated typemap in -M check
    # because -M granularity causes unnecessary regens.
    # See "_mbwxspp_force_xs_regen"
    #File::Spec->catdir($self->build_dir, 'typemap'),
  );

  my $main_time = 1e99;
  $main_time = -M $main_xs_file
    if defined $main_xs_file and -e $main_xs_file;

  if (keys(%$xs_files) == 1
      && (values(%$xs_files))[0] =~ /\Q$main_xs_file\E$/)
  {
    # is main xs file still current?
    if (!$self->{_mbwxspp_force_xs_regen} && $main_time < $newest) {
      return 1;
    }
  }

  delete $self->{_mbwxspp_force_xs_regen}; # done its job
  $self->log_info("Generating main XS file...\n");

  my $early_includes = join "\n",
                       map {
                         s/^\s*#\s*include\s*//i;
                         /^"/ or $_ = "<$_>";
                         "#include $_"
                       }
                       @{ $self->early_includes || [] };

  my $module_name = $self->module_name;
  my $xs_code = <<"HERE";
/*
 * WARNING: This file was auto-generated. Changes will be lost!
 */

$early_includes

#ifdef __cplusplus
extern "C" {
#endif
#include "EXTERN.h"
#include "perl.h"
#include "XSUB.h"
#include "ppport.h"
#undef do_open
#undef do_close
#ifdef __cplusplus
}
#endif

MODULE = $module_name	PACKAGE = $module_name

HERE

  my $typemap_args = '';
  $typemap_args .= '-t "' . _naive_shell_escape(File::Spec->abs2rel($_, $self->build_dir)) . '" ' foreach keys %$xspt_files;

  foreach my $xsp_file (keys %$xsp_files) {
    my $relative_path_file = _naive_shell_escape( File::Spec->abs2rel($xsp_file, $self->build_dir) );
    my $cmd = qq{INCLUDE_COMMAND: \$^X -MExtUtils::XSpp::Cmd -e xspp -- $typemap_args "$relative_path_file"\n\n};
    $xs_code .= $cmd;
  }

  my $outfile = File::Spec->catdir($self->build_dir, 'main.xs');
  open my $fh, '>', $outfile
    or die "Could not open '$outfile' for writing: $!";
  print $fh $xs_code;
  close $fh;

  return 1;
}

sub _load_extra_typemap_modules {
  my $self = shift;

  require ExtUtils::Typemaps;
  my $extra_modules = $self->extra_typemap_modules||{};

  foreach my $module (keys %$extra_modules) {
    my $str = $extra_modules->{$module}
              ? "$module $extra_modules->{$module}"
              : $module;
    if (not eval "use $str;1;") {
      $self->log_warn(<<HERE);
ERROR: Required typemap module '$module' version $extra_modules->{$module} not found.
Error message:
$@
HERE
    }
  }
}

sub ACTION_generate_typemap {
  my $self = shift;
  $self->depends_on('create_buildarea');

  require File::Spec;

  my $files = $self->find_map_files;

  $self->_load_extra_typemap_modules();
  my $extra_modules = $self->extra_typemap_modules||{};

  my $newest = $self->_calc_newest(
    keys(%$files),
    'Build.PL',
  );

  my $out_map_file = File::Spec->catfile($self->build_dir, 'typemap');
  if (-f $out_map_file and -M $out_map_file < $newest) {
    return 1;
  }

  $self->log_info("Processing XS typemap files...\n");

  # merge all typemaps into 'buildtmp/typemap'
  # creates empty typemap file if there are no files to merge
  my $merged = ExtUtils::Typemaps->new;
  $merged->merge(typemap => $_->new) for keys %$extra_modules;

  foreach my $file (keys %$files) {
    $merged->merge(typemap => ExtUtils::Typemaps->new(file => $file));
  }
  $merged->write(file => $out_map_file);

  $self->{_mbwxspp_force_xs_regen} = 1;
}

sub find_map_files  {
  my $self = shift;
  my $files = $self->_find_file_by_type('map', 'lib');
  my @extra_files = map glob($_),
                    map File::Spec->catfile($_, '*.map'),
                    (@{$self->extra_xs_dirs||[]});

  $files->{$_} = $_ foreach map $self->localize_file_path($_),
                            @extra_files;

  $files->{'typemap'} = 'typemap' if -f 'typemap';

  return $files;
}


sub find_xsp_files  {
  my $self = shift;

  my @extra_files = map glob($_),
                    map File::Spec->catfile($_, '*.xsp'),
                    (@{$self->extra_xs_dirs||[]});

  my $files = $self->_find_file_by_type('xsp', 'lib');
  $files->{$_} = $_ foreach map $self->localize_file_path($_),
                            @extra_files;

  require File::Basename;
  # XS++ typemaps aren't XSP files in this regard
  foreach my $file (keys %$files) {
    delete $files->{$file}
      if File::Basename::basename($file) eq 'typemap.xsp';
  }

  return $files;
}

sub find_xsp_typemaps {
  my $self = shift;

  my $xsp_files = $self->_find_file_by_type('xsp', 'lib');
  my $xspt_files = $self->_find_file_by_type('xspt', 'lib');

  foreach (keys %$xsp_files) { # merge over 'typemap.xsp's
    next unless File::Basename::basename($_) eq 'typemap.xsp';
    $xspt_files->{$_} = $_
  }

  my @extra_files = grep -e $_,
                    map glob($_),
                    grep defined $_ && /\S/,
                    map { ( File::Spec->catfile($_, 'typemap.xsp'),
                            File::Spec->catfile($_, '*.xspt') ) }
                    @{$self->extra_xs_dirs||[]};
  $xspt_files->{$_} = $_ foreach map $self->localize_file_path($_),
                                 @extra_files;
  return $xspt_files;
}


# This overrides the equivalent in the base class to add the buildtmp and
# the main directory
sub find_xs_files {
  my $self = shift;
  my $xs_files = $self->SUPER::find_xs_files;

  my @extra_files = map glob($_),
                    map File::Spec->catfile($_, '*.xs'),
                    @{$self->extra_xs_dirs||[]};

  $xs_files->{$_} = $_ foreach map $self->localize_file_path($_),
                               @extra_files;

  my $auto_gen_file = File::Spec->catfile($self->build_dir, 'main.xs');
  if (-e $auto_gen_file) {
    $xs_files->{$auto_gen_file} =  $self->localize_file_path($auto_gen_file);
  }
  return $xs_files;
}


# overridden from original. We really require
# EU::ParseXS, so the "if (eval{require EU::PXS})" is gone.
sub compile_xs {
  my ($self, $file, %args) = @_;
  $self->log_verbose("$file -> $args{outfile}\n");

  require ExtUtils::ParseXS;

  my $main_dir = Cwd::abs_path( Cwd::cwd() );
  my $build_dir = Cwd::abs_path( $self->build_dir );
  ExtUtils::ParseXS::process_file(
    filename   => $file,
    prototypes => 0,
    output     => $args{outfile},
    # not default:
    'C++' => 1,
    hiertype => 1,
    typemap    => File::Spec->catfile($build_dir, 'typemap'),
  );
}

# modified from orinal M::B (FIXME: shouldn't do this with private methods)
# Changes from the original:
# - If we're looking at the "main.xs" file in the build
#   directory, override the TARGET paths with the real
#   module name.
# - In that case, also override the file basename for further
#   build products (maybe this should only be done on installation
#   into blib/.../?)
sub _infer_xs_spec {
  my $self = shift;
  my $file = shift;

  my $cf = $self->{config};

  my %spec;

  my( $v, $d, $f ) = File::Spec->splitpath( $file );
  my @d = File::Spec->splitdir( $d );
  (my $file_base = $f) =~ s/\.[^.]+$//i;

  my $build_folder = $self->build_dir;
  if ($d =~ /\Q$build_folder\E/ && $file_base eq 'main') {
    my $name = $self->module_name;
    @d = split /::/, $name;
    $file_base = $d[-1];
    pop @d if @d;
  }
  else {
    # the module name
    shift( @d ) while @d && ($d[0] eq 'lib' || $d[0] eq '');
    pop( @d ) while @d && $d[-1] eq '';
  }

  $spec{base_name} = $file_base;

  $spec{src_dir} = File::Spec->catpath( $v, $d, '' );

  $spec{module_name} = join( '::', (@d, $file_base) );

  $spec{archdir} = File::Spec->catdir($self->blib, 'arch', 'auto',
				      @d, $file_base);

  $spec{bs_file} = File::Spec->catfile($spec{archdir}, "${file_base}.bs");

  $spec{lib_file} = File::Spec->catfile($spec{archdir},
					"${file_base}.".$cf->get('dlext'));

  $spec{c_file} = File::Spec->catfile( $spec{src_dir},
				       "${file_base}.c" );

  $spec{obj_file} = File::Spec->catfile( $spec{src_dir},
					 "${file_base}".$cf->get('obj_ext') );

  return \%spec;
}

__PACKAGE__->add_property( 'cpp_source_files'      => [] );
__PACKAGE__->add_property( 'cpp_source_dirs'       => ['src'] );
__PACKAGE__->add_property( 'build_dir'             => 'buildtmp' );
__PACKAGE__->add_property( 'extra_xs_dirs'         => [".", grep { -d $_ and /^xsp?$/i } glob("*")] );
__PACKAGE__->add_property( 'extra_typemap_modules' => {} );
__PACKAGE__->add_property( 'early_includes'        => [] );


sub _merge_hashes {
  my $self = shift;
  my %h;
  foreach my $m (@_) {
    $h{$_} = $m->{$_} foreach keys %$m;
  }
  return \%h;
}

sub _calc_newest {
  my $self = shift;
  my $newest = 1.e99;
  foreach my $file (@_) {
    next if not defined $file;
    my $age = -M $file;
    $newest = $age if defined $age and $age < $newest;
  }
  return $newest;
}

1;

__END__

=head1 NAME

Module::Build::WithXSpp - XS++ enhanced flavour of Module::Build

=head1 SYNOPSIS

In F<Build.PL>:

  use strict;
  use warnings;
  use 5.006001;
  
  use Module::Build::WithXSpp;
  
  my $build = Module::Build::WithXSpp->new(
    # normal Module::Build arguments...
    # optional: mix in some extra C typemaps:
    extra_typemap_modules => {
      'ExtUtils::Typemaps::ObjectMap' => '0',
    },
  );
  $build->create_build_script;

=head1 DESCRIPTION

This subclass of L<Module::Build> adds some tools and
processes to make it easier to use for wrapping C++
using XS++ (L<ExtUtils::XSpp>).

There are a few minor differences from using C<Module::Build>
for an ordinary XS module and a few conventions that you
should be aware of as an XS++ module author. They are documented
in the L</"FEATURES AND CONVENTIONS"> section below. But if you
can't be bothered to read all that, you may choose skip it and
blindly follow the advice in L</"JUMP START FOR THE IMPATIENT">.

An example of a full distribution based on this build tool
can be found in the L<ExtUtils::XSpp> distribution under
F<examples/XSpp-Example>. Using that example as the basis
for your C<Module::Build::WithXSpp>-based distribution
is probably a good idea.

=head1 FEATURES AND CONVENTIONS

=head2 XS files

By default, C<Module::Build::WithXSpp> will automatically
generate a main XS file for your module which includes
all XS++ files and does the correct incantations to support
C++.

If C<Module::Build::WithXSpp> detects any XS files in your
module, it will skip the generation of this default file
and assume that you wrote a custom main XS file. If
that is not what you want, and wish to simply include
plain XS code, then you should put the XS in a verbatim
block of an F<.xsp> file. In case you need to use the plain-C
part of an XS file for C<#include> directives and other code,
then put your code into a header file and C<#include> it
from an F<.xsp> file:

In F<src/mystuff.h>:

  #include <something>
  using namespace some::thing;

In F<xsp/MyClass.xsp>

  #include "mystuff.h"
  
  %{
    ... verbatim XS here ...
  %}

Note that there is no guarantee about the order in which the
XS++ files are picked up.

=head2 Build directory

When building your XS++ based extension, a temporary
build directory F<buildtmp> is created for the byproducts.
It is automatically cleaned up by C<./Build clean>.

=head2 Source directories

A Perl module distribution typically has the module C<.pm> files
in its F<lib> subdirectory. In a C<Module::Build::WithXSpp> based
distribution, there are two more such conventions about source
directories:

If any C++ source files are present in the F<src> directory, they
will be compiled to object files and linked automatically.

Any C<.xs>, C<.xsp>, and C<.xspt> files in an F<xs> or F<xsp>
subdirectory will be automatically picked up and included
by the build system.

For backwards compatibility, files of the above types are also
recognized in F<lib>.

=head2 Typemaps

In XS++, there are two types of typemaps: The ordinary XS typemaps
which conventionally put in a file called F<typemap>, and XS++ typemaps.

The ordinary XS typemaps will be found in the main directory,
under F<lib>, and in the XS directories (F<xs> and F<xsp>). They are
required to carry the C<.map> extension or to be called F<typemap>.
You may use multiple F<.map> files if the entries do not
collide. They will be merged at build time into a complete F<typemap> file
in the temporary build directory.

The C<extra_typemap_modules> option is the preferred way to do XS typemapping.
It works like any other C<Module::Build> argument that declares dependencies
except that it loads the listed modules at build time and includes their
typemaps into the build.

The XS++ typemaps are required to carry the C<.xspt> extension or (for
backwards compatibility) to be called C<typemap.xsp>.

=head2 Detecting the C++ compiler

C<Module::Build::WithXSpp> uses L<ExtUtils::CppGuess> to detect
a C++ compiler on your system that is compatible with the C compiler
that was used to compile your perl binary. It sets some
additional compiler/linker options.

This is known to work on GCC (Linux, MacOS, Windows, and ?) as well
as the MS VC toolchain. Patches to enable other compilers are
B<very> welcome.

=head2 Automatic dependencies

C<Module::Build::WithXSpp> automatically adds several dependencies
(on the currently running versions) to your distribution.
You can disable this by setting
C<auto_configure_requires =E<gt> 0> in F<Build.PL>.

These are at configure time: C<Module::Build>,
C<Module::Build::WithXSpp> itself, and C<ExtUtils::CppGuess>.
Additionally there will be a build-time dependency on
C<ExtUtils::XSpp>.

You do not have to set these dependencies yourself unless
you need to set the required versions manually.

=head2 Include files

Unfortunately, including the perl headers produces quite some pollution and
redefinition of common symbols. Therefore, it may be necessary to include
some of your headers before including the perl headers. Specifically,
this is the case for MSVC compilers and the standard library headers.

Therefore, if you care about that platform in the least, you should use the C<early_includes>
option when creating a C<Module::Build::WithXSpp> object to list headers
to include before the perl headers. If such a supplied header file starts with
a double quote, C<#include "..."> is used, otherwise C<#include E<lt>...E<gt>>
is the default. Example:

  Module::Build::WithXSpp->new(
    early_includes => [qw(
      "mylocalheader.h"
      <mysystemheader.h>
    )]
  )

=head1 JUMP START FOR THE IMPATIENT

There are as many ways to start a new CPAN distribution as there
are CPAN distributions. Choose your favourite
(I just do C<h2xs -An My::Module>), then apply a few
changes to your setup:

=over 2

=item *

Obliterate any F<Makefile.PL>.

This is what your F<Build.PL> should look like:

  use strict;
  use warnings;
  use 5.006001;
  use Module::Build::WithXSpp;
  
  my $build = Module::Build::WithXSpp->new(
    module_name         => 'My::Module',
    license             => 'perl',
    dist_author         => q{John Doe <john_does_mail_address>},
    dist_version_from   => 'lib/My/Module.pm',
    build_requires => { 'Test::More' => 0, },
    extra_typemap_modules => {
      'ExtUtils::Typemaps::ObjectMap' => '0',
      # ...
    },
  );
  $build->create_build_script;

If you need to link against some library C<libfoo>, add this to
the options:

    extra_linker_flags => [qw(-lfoo)],

There is C<extra_compiler_flags>, too, if you need it.

=item *

You create two folders in the main distribution folder:
F<src> and F<xsp>.

=item *

You put any C++ code that you want to build and include
in the module into F<src/>. All the typical C(++) file
extensions are recognized and will be compiled to object files
and linked into the module. And headers in that folder will
be accessible for C<#include E<lt>myheader.hE<gt>>.

For good measure, move a copy of F<ppport.h> to that directory.
See L<Devel::PPPort>.

=item *

You do not write normal XS files. Instead, you write XS++ and
put it into the F<xsp/> folder in files with the C<.xsp>
extension. Do not worry, you can include verbatim XS blocks
in XS++. For details on XS++, see L<ExtUtils::XSpp>.

=item *

If you need to do any XS type mapping, put your typemaps
into a F<.map> file in the C<xsp> directory. Alternatively,
search CPAN for an appropriate typemap module (cf.
L<ExtUtils::Typemaps::Default> for an explanation).
XS++ typemaps belong into F<.xspt> files in the same directory.

=item *

In this scheme, F<lib/> only contains Perl module files (and POD).
If you started from a pure-Perl distribution, don't forget to add
these magic two lines to your main module:

  require XSLoader;
  XSLoader::load('My::Module', $VERSION);

=back

=head1 SEE ALSO

L<Module::Build> upon which this module is based.

L<ExtUtils::XSpp> implements XS++. The C<ExtUtils::XSpp> distribution
contains an F<examples> directory with a usage example of this module.

L<ExtUtils::Typemaps> implements progammatic modification (merging)
of C/XS typemaps. C<ExtUtils::Typemaps> was renamed from C<ExtUtils::Typemap>
since the original name conflicted with the core F<typemap> file on
case-insensitive file systems.

L<ExtUtils::Typemaps::Default> explains the concept of having typemaps
shipped as modules.

L<ExtUtils::Typemaps::ObjectMap> is such a typemap module and
probably very useful for any XS++ module.

L<ExtUtils::Typemaps::STL::String> implements simple typemapping for
STL C<std::string>s.

=head1 AUTHOR

Steffen Mueller <smueller@cpan.org>

With input and bug fixes from:

Mattia Barbon

Shmuel Fomberg

Florian Schlichting

=head1 COPYRIGHT AND LICENSE

Copyright 2010, 2011, 2012, 2013 Steffen Mueller.

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

=cut