1#!./miniperl -w
2
3use strict;
4
5my $osname = $^O;
6my $file = 'lib/buildcustomize.pl';
7
8if ( @ARGV % 2 ) {
9    my $dir = shift;
10    chdir $dir or die "Can't chdir '$dir': $!";
11    unshift @INC, 'lib';
12}
13
14if ( @ARGV ) {
15    # Used during cross-compilation.
16    $osname = $ARGV[1];
17}
18
19# To clarify, this isn't the entire suite of modules considered "toolchain"
20# It's not even all modules needed to build ext/
21# It's just the source paths of the (minimum complete set of) modules in ext/
22# needed to build the nonxs modules
23# After which, all nonxs modules are in lib, which was always sufficient to
24# allow miniperl to build everything else.
25# Getopt::Long is here because it's used by podlators, which is one of the
26# nonxs modules.
27# Term::ReadLine is not here for building but for allowing the debugger to
28# run under miniperl when nothing but miniperl will build :-(.
29# Text::ParseWords is required in ExtUtils::Liblist::Kid
30
31my @toolchain = qw(cpan/AutoLoader/lib
32		   dist/Carp/lib
33		   dist/PathTools dist/PathTools/lib
34		   cpan/ExtUtils-Install/lib
35		   cpan/ExtUtils-MakeMaker/lib
36		   cpan/ExtUtils-Manifest/lib
37		   cpan/File-Path/lib
38		   ext/re
39		   dist/Term-ReadLine/lib
40                   dist/Exporter/lib
41                   ext/File-Find/lib
42                   cpan/Text-Tabs/lib
43		   dist/constant/lib
44		   cpan/version/lib
45		   cpan/Getopt-Long/lib
46		   cpan/Text-ParseWords/lib
47		   );
48
49# These are for XS building on Win32, since nonxs and xs build simultaneously
50# on Win32 if parallel building
51push @toolchain, qw(
52	dist/ExtUtils-ParseXS/lib
53	cpan/parent/lib
54	cpan/ExtUtils-Constant/lib
55) if $^O eq 'MSWin32';
56push @toolchain, 'ext/VMS-Filespec/lib' if $^O eq 'VMS';
57
58unshift @INC, @toolchain;
59require File::Spec::Functions;
60require Cwd;
61
62my $cwd  = Cwd::getcwd();
63
64defined $cwd
65  or die "$0: Can't determine current working directory\n";
66
67# lib must be last, as the toolchain modules write themselves into it
68# as they build, and it's important that @INC order ensures that the partially
69# written files are always masked by the complete versions.
70
71my $inc = join ",\n        ",
72    map { "q\0$_\0" }
73    (map {File::Spec::Functions::rel2abs($_, $cwd)} (
74# faster build on the non-parallel Win32 build process
75        $^O eq 'MSWin32' ? ('lib', @toolchain ) : (@toolchain, 'lib')
76    ));
77
78open my $fh, '>', $file
79    or die "Can't open $file: $!";
80
81my $error;
82
83# If any of the system's build tools are written in Perl, then this module
84# may well be loaded by a much older version than we are building. So keep it
85# as backwards compatible as is easy.
86print $fh <<"EOT" or $error = "Can't print to $file: $!";
87#!perl
88
89#   !!!!!!!   DO NOT EDIT THIS FILE   !!!!!!!
90#   This file is generated by write_buildcustomize.pl.
91#   Any changes made here will be lost!
92
93# We are miniperl, building extensions
94# Replace the first entry of \@INC ("lib") with the list of
95# directories we need.
96splice(\@INC, 0, 1, $inc);
97\$^O = '$osname';
98__END__
99EOT
100
101if ($error) {
102    close $fh
103        or warn "Can't unlink $file after error: $!";
104} else {
105    if (close $fh) {
106        do $file and exit;
107        $error = "Can't load generated $file: $@";
108    } else {
109        $error = "Can't close $file: $!";
110    }
111}
112
113# It's going very wrong, so try to remove the botched file.
114
115unlink $file
116    or warn "Can't unlink $file after error: $!";
117die $error;
118
119# ex: set ts=8 sts=4 sw=4 et:
120