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[perl5.git] / lib / ExtUtils / Mkbootstrap.pm
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005c1a0e 1package ExtUtils::Mkbootstrap;
15e1d173 2
875fa795 3$VERSION = substr q$Revision: 1.14 $, 10;
8a1da95f 4# $Date: 1996/09/03 17:04:43 $
15e1d173 5
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6use Config;
7use Exporter;
8@ISA=('Exporter');
9@EXPORT='&Mkbootstrap';
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10
11sub Mkbootstrap {
005c1a0e 12 my($baseext, @bsloadlibs)=@_;
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13 @bsloadlibs = grep($_, @bsloadlibs); # strip empty libs
14
15 print STDOUT " bsloadlibs=@bsloadlibs\n" if $Verbose;
16
17 # We need DynaLoader here because we and/or the *_BS file may
18 # call dl_findfile(). We don't say `use' here because when
19 # first building perl extensions the DynaLoader will not have
20 # been built when MakeMaker gets first used.
21 require DynaLoader;
22
23 rename "$baseext.bs", "$baseext.bso"
24 if -s "$baseext.bs";
25
26 if (-f "${baseext}_BS"){
27 $_ = "${baseext}_BS";
28 package DynaLoader; # execute code as if in DynaLoader
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29 local($osname, $dlsrc) = (); # avoid warnings
30 ($osname, $dlsrc) = @Config::Config{qw(osname dlsrc)};
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31 $bscode = "";
32 unshift @INC, ".";
33 require $_;
34 shift @INC;
35 }
36
37 if ($Config{'dlsrc'} =~ /^dl_dld/){
38 package DynaLoader;
39 push(@dl_resolve_using, dl_findfile('-lc'));
40 }
41
42 my(@all) = (@bsloadlibs, @DynaLoader::dl_resolve_using);
43 my($method) = '';
44 if (@all){
45 open BS, ">$baseext.bs"
46 or die "Unable to open $baseext.bs: $!";
47 print STDOUT "Writing $baseext.bs\n";
48 print STDOUT " containing: @all" if $Verbose;
f360dba1 49 print BS "# $baseext DynaLoader bootstrap file for $^O architecture.\n";
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50 print BS "# Do not edit this file, changes will be lost.\n";
51 print BS "# This file was automatically generated by the\n";
875fa795 52 print BS "# Mkbootstrap routine in ExtUtils::Mkbootstrap (v$VERSION).\n";
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53 print BS "\@DynaLoader::dl_resolve_using = ";
54 # If @all contains names in the form -lxxx or -Lxxx then it's asking for
55 # runtime library location so we automatically add a call to dl_findfile()
56 if (" @all" =~ m/ -[lLR]/){
57 print BS " dl_findfile(qw(\n @all\n ));\n";
58 }else{
59 print BS " qw(@all);\n";
60 }
61 # write extra code if *_BS says so
62 print BS $DynaLoader::bscode if $DynaLoader::bscode;
63 print BS "\n1;\n";
64 close BS;
65 }
66}
67
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681;
69
70__END__
71
72=head1 NAME
73
74ExtUtils::Mkbootstrap - make a bootstrap file for use by DynaLoader
75
76=head1 SYNOPSIS
77
78C<mkbootstrap>
79
80=head1 DESCRIPTION
81
82Mkbootstrap typically gets called from an extension Makefile.
83
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84There is no C<*.bs> file supplied with the extension. Instead, there may
85be a C<*_BS> file which has code for the special cases, like posix for
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86berkeley db on the NeXT.
87
88This file will get parsed, and produce a maybe empty
89C<@DynaLoader::dl_resolve_using> array for the current architecture.
90That will be extended by $BSLOADLIBS, which was computed by
91ExtUtils::Liblist::ext(). If this array still is empty, we do nothing,
92else we write a .bs file with an C<@DynaLoader::dl_resolve_using>
93array.
94
95The C<*_BS> file can put some code into the generated C<*.bs> file by
96placing it in C<$bscode>. This is a handy 'escape' mechanism that may
97prove useful in complex situations.
98
99If @DynaLoader::dl_resolve_using contains C<-L*> or C<-l*> entries then
100Mkbootstrap will automatically add a dl_findfile() call to the
101generated C<*.bs> file.
102
103=cut