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This is my patch patch.1k for perl5.001.
[perl5.git] / lib / ExtUtils / Mkbootstrap.pm
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1package ExtUtils::Mkbootstrap;
2use Config;
3use Exporter;
4@ISA=('Exporter');
5@EXPORT='&Mkbootstrap';
6$Version=2.0; # just to start somewhere
7
8sub Mkbootstrap {
9
10=head1 USEFUL SUBROUTINES
11
12=head2 Mkbootstrap()
13
14Make a bootstrap file for use by this system's DynaLoader. It
15typically gets called from an extension Makefile.
16
17There is no C<*.bs> file supplied with the extension. Instead a
18C<*_BS> file which has code for the special cases, like posix for
19berkeley db on the NeXT.
20
21This file will get parsed, and produce a maybe empty
22C<@DynaLoader::dl_resolve_using> array for the current architecture.
23That will be extended by $BSLOADLIBS, which was computed by Andy's
24extliblist script. If this array still is empty, we do nothing, else
25we write a .bs file with an C<@DynaLoader::dl_resolve_using> array, but
26without any C<if>s, because there is no longer a need to deal with
27special cases.
28
29The C<*_BS> file can put some code into the generated C<*.bs> file by placing
30it in C<$bscode>. This is a handy 'escape' mechanism that may prove
31useful in complex situations.
32
33If @DynaLoader::dl_resolve_using contains C<-L*> or C<-l*> entries then
34Mkbootstrap will automatically add a dl_findfile() call to the
35generated C<*.bs> file.
36
37=cut
38
39 my($baseext, @bsloadlibs)=@_;
40
41 @bsloadlibs = grep($_, @bsloadlibs); # strip empty libs
42
43 print STDOUT " bsloadlibs=@bsloadlibs\n" if $Verbose;
44
45 # We need DynaLoader here because we and/or the *_BS file may
46 # call dl_findfile(). We don't say `use' here because when
47 # first building perl extensions the DynaLoader will not have
48 # been built when MakeMaker gets first used.
49 require DynaLoader;
50
51 rename "$baseext.bs", "$baseext.bso"
52 if -s "$baseext.bs";
53
54 if (-f "${baseext}_BS"){
55 $_ = "${baseext}_BS";
56 package DynaLoader; # execute code as if in DynaLoader
57 local($osname, $dlsrc) = (); # avoid warnings
58 ($osname, $dlsrc) = @Config::Config{qw(osname dlsrc)};
59 $bscode = "";
60 unshift @INC, ".";
61 require $_;
62 shift @INC;
63 }
64
65 if ($Config{'dlsrc'} =~ /^dl_dld/){
66 package DynaLoader;
67 push(@dl_resolve_using, dl_findfile('-lc'));
68 }
69
70 my(@all) = (@bsloadlibs, @DynaLoader::dl_resolve_using);
71 my($method) = '';
72 if (@all){
73 open BS, ">$baseext.bs"
74 or die "Unable to open $baseext.bs: $!";
75 print STDOUT "Writing $baseext.bs\n";
76 print STDOUT " containing: @all" if $Verbose;
77 print BS "# $baseext DynaLoader bootstrap file for $Config{'osname'} architecture.\n";
78 print BS "# Do not edit this file, changes will be lost.\n";
79 print BS "# This file was automatically generated by the\n";
80 print BS "# Mkbootstrap routine in ExtUtils::Mkbootstrap (v$Version).\n";
81 print BS "\@DynaLoader::dl_resolve_using = ";
82 # If @all contains names in the form -lxxx or -Lxxx then it's asking for
83 # runtime library location so we automatically add a call to dl_findfile()
84 if (" @all" =~ m/ -[lLR]/){
85 print BS " dl_findfile(qw(\n @all\n ));\n";
86 }else{
87 print BS " qw(@all);\n";
88 }
89 # write extra code if *_BS says so
90 print BS $DynaLoader::bscode if $DynaLoader::bscode;
91 print BS "\n1;\n";
92 close BS;
93 }
94}
95