This is a live mirror of the Perl 5 development currently hosted at https://github.com/perl/perl5
Merge branch 'perlgov-omnibus-amendments' into blead
[perl5.git] / write_buildcustomize.pl
... / ...
CommitLineData
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 cpan/ExtUtils-PL2Bat/lib
48 );
49
50# These are for XS building on Win32, since nonxs and xs build simultaneously
51# on Win32 if parallel building
52push @toolchain, qw(
53 dist/ExtUtils-ParseXS/lib
54 cpan/parent/lib
55 cpan/ExtUtils-Constant/lib
56) if $^O eq 'MSWin32';
57push @toolchain, 'ext/VMS-Filespec/lib' if $^O eq 'VMS';
58
59unshift @INC, @toolchain;
60require File::Spec::Functions;
61require Cwd;
62
63my $cwd = Cwd::getcwd();
64
65defined $cwd
66 or die "$0: Can't determine current working directory\n";
67
68# lib must be last, as the toolchain modules write themselves into it
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" }
74 (map {File::Spec::Functions::rel2abs($_, $cwd)} (
75# faster build on the non-parallel Win32 build process
76 $^O eq 'MSWin32' ? ('lib', @toolchain ) : (@toolchain, 'lib')
77 ));
78
79open my $fh, '>', $file
80 or die "Can't open $file: $!";
81
82my $error;
83
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.
87print $fh <<"EOT" or $error = "Can't print to $file: $!";
88#!perl
89
90# !!!!!!! DO NOT EDIT THIS FILE !!!!!!!
91# This file is generated by write_buildcustomize.pl.
92# Any changes made here will be lost!
93
94# We are miniperl, building extensions
95# Replace the first entry of \@INC ("lib") with the list of
96# directories we need.
97splice(\@INC, 0, 1, $inc);
98\$^O = '$osname';
99__END__
100EOT
101
102if ($error) {
103 close $fh
104 or warn "Can't unlink $file after error: $!";
105} else {
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 }
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
120# ex: set ts=8 sts=4 sw=4 et: