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[perl5.git] / write_buildcustomize.pl
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1#!./miniperl -w
2
3use strict;
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4
5my $osname = $^O;
6my $file = 'lib/buildcustomize.pl';
7
8if ( @ARGV % 2 ) {
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9 my $dir = shift;
10 chdir $dir or die "Can't chdir '$dir': $!";
11 unshift @INC, 'lib';
12}
13
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14if ( @ARGV ) {
15 # Used during cross-compilation.
16 $osname = $ARGV[1];
17}
b78ac715 18
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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.
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25# Getopt::Long is here because it's used by podlators, which is one of the
26# nonxs modules.
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27# Term::ReadLine is not here for building but for allowing the debugger to
28# run under miniperl when nothing but miniperl will build :-(.
6f44131d 29# Text::ParseWords is required in ExtUtils::Liblist::Kid
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30
31my @toolchain = qw(cpan/AutoLoader/lib
634ff085 32 dist/Carp/lib
cb8c8458 33 dist/PathTools dist/PathTools/lib
d393d7e5 34 cpan/ExtUtils-Install/lib
5e4c4c91 35 cpan/ExtUtils-MakeMaker/lib
854a00d8 36 cpan/ExtUtils-Manifest/lib
5e4c4c91 37 cpan/File-Path/lib
7353f64c 38 ext/re
f61462d5 39 dist/Term-ReadLine/lib
3110a055 40 dist/Exporter/lib
6de85bb4 41 ext/File-Find/lib
f4e064af 42 cpan/Text-Tabs/lib
70c90635 43 dist/constant/lib
0c7fc641 44 cpan/version/lib
bb6e76f0 45 cpan/Getopt-Long/lib
6f44131d 46 cpan/Text-ParseWords/lib
2c4406d7 47 cpan/ExtUtils-PL2Bat/lib
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48 );
49
6f44131d 50# These are for XS building on Win32, since nonxs and xs build simultaneously
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51# on Win32 if parallel building
52push @toolchain, qw(
3bdc51af 53 dist/ExtUtils-ParseXS/lib
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54 cpan/parent/lib
55 cpan/ExtUtils-Constant/lib
56) if $^O eq 'MSWin32';
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57push @toolchain, 'ext/VMS-Filespec/lib' if $^O eq 'VMS';
58
59unshift @INC, @toolchain;
60require File::Spec::Functions;
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61require Cwd;
62
63my $cwd = Cwd::getcwd();
5e4c4c91 64
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65defined $cwd
66 or die "$0: Can't determine current working directory\n";
67
2effe01f 68# lib must be last, as the toolchain modules write themselves into it
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69# as they build, and it's important that @INC order ensures that the partially
70# written files are always masked by the complete versions.
71
72my $inc = join ",\n ",
73 map { "q\0$_\0" }
3bdc51af 74 (map {File::Spec::Functions::rel2abs($_, $cwd)} (
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75# faster build on the non-parallel Win32 build process
76 $^O eq 'MSWin32' ? ('lib', @toolchain ) : (@toolchain, 'lib')
77 ));
5e4c4c91 78
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79open my $fh, '>', $file
80 or die "Can't open $file: $!";
81
82my $error;
83
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84# If any of the system's build tools are written in Perl, then this module
85# may well be loaded by a much older version than we are building. So keep it
86# as backwards compatible as is easy.
b78ac715 87print $fh <<"EOT" or $error = "Can't print to $file: $!";
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88#!perl
89
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90# !!!!!!! DO NOT EDIT THIS FILE !!!!!!!
91# This file is generated by write_buildcustomize.pl.
92# Any changes made here will be lost!
93
5e4c4c91 94# We are miniperl, building extensions
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95# Replace the first entry of \@INC ("lib") with the list of
96# directories we need.
97splice(\@INC, 0, 1, $inc);
fdf90be3 98\$^O = '$osname';
f4eedc6b 99__END__
5e4c4c91 100EOT
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101
102if ($error) {
103 close $fh
104 or warn "Can't unlink $file after error: $!";
105} else {
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106 if (close $fh) {
107 do $file and exit;
108 $error = "Can't load generated $file: $@";
109 } else {
110 $error = "Can't close $file: $!";
111 }
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112}
113
114# It's going very wrong, so try to remove the botched file.
115
116unlink $file
117 or warn "Can't unlink $file after error: $!";
118die $error;
119
b78ac715 120# ex: set ts=8 sts=4 sw=4 et: