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[perl5.git] / write_buildcustomize.pl
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1#!./miniperl -w
2
3use strict;
4if (@ARGV) {
5 my $dir = shift;
6 chdir $dir or die "Can't chdir '$dir': $!";
7 unshift @INC, 'lib';
8}
9
10unshift @INC, ('dist/Cwd', 'dist/Cwd/lib');
11require File::Spec::Functions;
12
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13my $file = 'lib/buildcustomize.pl';
14
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15# To clarify, this isn't the entire suite of modules considered "toolchain"
16# It's not even all modules needed to build ext/
17# It's just the source paths of the (minimum complete set of) modules in ext/
18# needed to build the nonxs modules
19# After which, all nonxs modules are in lib, which was always sufficient to
20# allow miniperl to build everything else.
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21# Term::ReadLine is not here for building but for allowing the debugger to
22# run under miniperl when nothing but miniperl will build :-(.
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23
24my @toolchain = qw(cpan/AutoLoader/lib
634ff085 25 dist/Carp/lib
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26 dist/Cwd dist/Cwd/lib
27 dist/ExtUtils-Command/lib
28 dist/ExtUtils-Install/lib
29 cpan/ExtUtils-MakeMaker/lib
30 dist/ExtUtils-Manifest/lib
31 cpan/File-Path/lib
7353f64c 32 ext/re
f61462d5 33 dist/Term-ReadLine/lib
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34 );
35
36# Used only in ExtUtils::Liblist::Kid::_win32_ext()
37push @toolchain, 'cpan/Text-ParseWords/lib' if $^O eq 'MSWin32';
38
2effe01f 39# lib must be last, as the toolchain modules write themselves into it
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40# as they build, and it's important that @INC order ensures that the partially
41# written files are always masked by the complete versions.
42
43my $inc = join ",\n ",
44 map { "q\0$_\0" }
45 (map {File::Spec::Functions::rel2abs($_)} @toolchain, 'lib'), '.';
46
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47open my $fh, '>', $file
48 or die "Can't open $file: $!";
49
50my $error;
51
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52# If any of the system's build tools are written in Perl, then this module
53# may well be loaded by a much older version than we are building. So keep it
54# as backwards compatible as is easy.
b78ac715 55print $fh <<"EOT" or $error = "Can't print to $file: $!";
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56#!perl
57
58# We are miniperl, building extensions
59# Reset \@INC completely, adding the directories we need, and removing the
60# installed directories (which we don't need to read, and may confuse us)
61\@INC = ($inc);
62EOT
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63
64if ($error) {
65 close $fh
66 or warn "Can't unlink $file after error: $!";
67} else {
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68 if (close $fh) {
69 do $file and exit;
70 $error = "Can't load generated $file: $@";
71 } else {
72 $error = "Can't close $file: $!";
73 }
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74}
75
76# It's going very wrong, so try to remove the botched file.
77
78unlink $file
79 or warn "Can't unlink $file after error: $!";
80die $error;
81
82# Local variables:
83# cperl-indent-level: 4
84# indent-tabs-mode: nil
85# End:
86#
87# ex: set ts=8 sts=4 sw=4 et: