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Add DO NOT EDIT notice to buildcustomize.pl
[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
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10my $file = 'lib/buildcustomize.pl';
11
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12# To clarify, this isn't the entire suite of modules considered "toolchain"
13# It's not even all modules needed to build ext/
14# It's just the source paths of the (minimum complete set of) modules in ext/
15# needed to build the nonxs modules
16# After which, all nonxs modules are in lib, which was always sufficient to
17# allow miniperl to build everything else.
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18# Term::ReadLine is not here for building but for allowing the debugger to
19# run under miniperl when nothing but miniperl will build :-(.
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20
21my @toolchain = qw(cpan/AutoLoader/lib
634ff085 22 dist/Carp/lib
cb8c8458 23 dist/PathTools dist/PathTools/lib
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24 dist/ExtUtils-Command/lib
25 dist/ExtUtils-Install/lib
26 cpan/ExtUtils-MakeMaker/lib
27 dist/ExtUtils-Manifest/lib
28 cpan/File-Path/lib
7353f64c 29 ext/re
f61462d5 30 dist/Term-ReadLine/lib
3110a055 31 dist/Exporter/lib
6de85bb4 32 ext/File-Find/lib
f4e064af 33 cpan/Text-Tabs/lib
70c90635 34 dist/constant/lib
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35 );
36
37# Used only in ExtUtils::Liblist::Kid::_win32_ext()
38push @toolchain, 'cpan/Text-ParseWords/lib' if $^O eq 'MSWin32';
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39push @toolchain, 'ext/VMS-Filespec/lib' if $^O eq 'VMS';
40
41unshift @INC, @toolchain;
42require File::Spec::Functions;
5e4c4c91 43
2effe01f 44# lib must be last, as the toolchain modules write themselves into it
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45# as they build, and it's important that @INC order ensures that the partially
46# written files are always masked by the complete versions.
47
48my $inc = join ",\n ",
49 map { "q\0$_\0" }
50 (map {File::Spec::Functions::rel2abs($_)} @toolchain, 'lib'), '.';
51
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52open my $fh, '>', $file
53 or die "Can't open $file: $!";
54
55my $error;
56
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57# If any of the system's build tools are written in Perl, then this module
58# may well be loaded by a much older version than we are building. So keep it
59# as backwards compatible as is easy.
b78ac715 60print $fh <<"EOT" or $error = "Can't print to $file: $!";
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61#!perl
62
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63# !!!!!!! DO NOT EDIT THIS FILE !!!!!!!
64# This file is generated by write_buildcustomize.pl.
65# Any changes made here will be lost!
66
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67# We are miniperl, building extensions
68# Reset \@INC completely, adding the directories we need, and removing the
69# installed directories (which we don't need to read, and may confuse us)
70\@INC = ($inc);
71EOT
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72
73if ($error) {
74 close $fh
75 or warn "Can't unlink $file after error: $!";
76} else {
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77 if (close $fh) {
78 do $file and exit;
79 $error = "Can't load generated $file: $@";
80 } else {
81 $error = "Can't close $file: $!";
82 }
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83}
84
85# It's going very wrong, so try to remove the botched file.
86
87unlink $file
88 or warn "Can't unlink $file after error: $!";
89die $error;
90
91# Local variables:
92# cperl-indent-level: 4
93# indent-tabs-mode: nil
94# End:
95#
96# ex: set ts=8 sts=4 sw=4 et: