This is a live mirror of the Perl 5 development currently hosted at https://github.com/perl/perl5
Re: Win32 modules & cygwin
[perl5.git] / lib / ExtUtils / Mkbootstrap.pm
CommitLineData
005c1a0e 1package ExtUtils::Mkbootstrap;
15e1d173 2
562c8117 3$VERSION = '1.16';
15e1d173 4
005c1a0e
AD
5use Config;
6use Exporter;
7@ISA=('Exporter');
8@EXPORT='&Mkbootstrap';
005c1a0e
AD
9
10sub Mkbootstrap {
005c1a0e 11 my($baseext, @bsloadlibs)=@_;
005c1a0e
AD
12 @bsloadlibs = grep($_, @bsloadlibs); # strip empty libs
13
14 print STDOUT " bsloadlibs=@bsloadlibs\n" if $Verbose;
15
16 # We need DynaLoader here because we and/or the *_BS file may
17 # call dl_findfile(). We don't say `use' here because when
18 # first building perl extensions the DynaLoader will not have
19 # been built when MakeMaker gets first used.
20 require DynaLoader;
21
22 rename "$baseext.bs", "$baseext.bso"
23 if -s "$baseext.bs";
24
25 if (-f "${baseext}_BS"){
26 $_ = "${baseext}_BS";
27 package DynaLoader; # execute code as if in DynaLoader
15e1d173
PP
28 local($osname, $dlsrc) = (); # avoid warnings
29 ($osname, $dlsrc) = @Config::Config{qw(osname dlsrc)};
005c1a0e
AD
30 $bscode = "";
31 unshift @INC, ".";
32 require $_;
33 shift @INC;
34 }
35
36 if ($Config{'dlsrc'} =~ /^dl_dld/){
37 package DynaLoader;
38 push(@dl_resolve_using, dl_findfile('-lc'));
39 }
40
41 my(@all) = (@bsloadlibs, @DynaLoader::dl_resolve_using);
42 my($method) = '';
43 if (@all){
44 open BS, ">$baseext.bs"
45 or die "Unable to open $baseext.bs: $!";
46 print STDOUT "Writing $baseext.bs\n";
47 print STDOUT " containing: @all" if $Verbose;
f360dba1 48 print BS "# $baseext DynaLoader bootstrap file for $^O architecture.\n";
005c1a0e
AD
49 print BS "# Do not edit this file, changes will be lost.\n";
50 print BS "# This file was automatically generated by the\n";
875fa795 51 print BS "# Mkbootstrap routine in ExtUtils::Mkbootstrap (v$VERSION).\n";
005c1a0e
AD
52 print BS "\@DynaLoader::dl_resolve_using = ";
53 # If @all contains names in the form -lxxx or -Lxxx then it's asking for
54 # runtime library location so we automatically add a call to dl_findfile()
55 if (" @all" =~ m/ -[lLR]/){
56 print BS " dl_findfile(qw(\n @all\n ));\n";
57 }else{
58 print BS " qw(@all);\n";
59 }
60 # write extra code if *_BS says so
61 print BS $DynaLoader::bscode if $DynaLoader::bscode;
62 print BS "\n1;\n";
63 close BS;
64 }
65}
66
15e1d173
PP
671;
68
69__END__
70
71=head1 NAME
72
73ExtUtils::Mkbootstrap - make a bootstrap file for use by DynaLoader
74
75=head1 SYNOPSIS
76
39234879 77C<Mkbootstrap>
15e1d173
PP
78
79=head1 DESCRIPTION
80
81Mkbootstrap typically gets called from an extension Makefile.
82
a7665c5e
GS
83There is no C<*.bs> file supplied with the extension. Instead, there may
84be a C<*_BS> file which has code for the special cases, like posix for
15e1d173
PP
85berkeley db on the NeXT.
86
87This file will get parsed, and produce a maybe empty
88C<@DynaLoader::dl_resolve_using> array for the current architecture.
89That will be extended by $BSLOADLIBS, which was computed by
90ExtUtils::Liblist::ext(). If this array still is empty, we do nothing,
91else we write a .bs file with an C<@DynaLoader::dl_resolve_using>
92array.
93
94The C<*_BS> file can put some code into the generated C<*.bs> file by
95placing it in C<$bscode>. This is a handy 'escape' mechanism that may
96prove useful in complex situations.
97
98If @DynaLoader::dl_resolve_using contains C<-L*> or C<-l*> entries then
99Mkbootstrap will automatically add a dl_findfile() call to the
100generated C<*.bs> file.
101
102=cut