1 package ExtUtils::Mkbootstrap;
5 @EXPORT='&Mkbootstrap';
6 $Version=2.0; # just to start somewhere
10 =head1 USEFUL SUBROUTINES
14 Make a bootstrap file for use by this system's DynaLoader. It
15 typically gets called from an extension Makefile.
17 There is no C<*.bs> file supplied with the extension. Instead a
18 C<*_BS> file which has code for the special cases, like posix for
19 berkeley db on the NeXT.
21 This file will get parsed, and produce a maybe empty
22 C<@DynaLoader::dl_resolve_using> array for the current architecture.
23 That will be extended by $BSLOADLIBS, which was computed by Andy's
24 extliblist script. If this array still is empty, we do nothing, else
25 we write a .bs file with an C<@DynaLoader::dl_resolve_using> array, but
26 without any C<if>s, because there is no longer a need to deal with
29 The C<*_BS> file can put some code into the generated C<*.bs> file by placing
30 it in C<$bscode>. This is a handy 'escape' mechanism that may prove
31 useful in complex situations.
33 If @DynaLoader::dl_resolve_using contains C<-L*> or C<-l*> entries then
34 Mkbootstrap will automatically add a dl_findfile() call to the
35 generated C<*.bs> file.
39 my($baseext, @bsloadlibs)=@_;
41 @bsloadlibs = grep($_, @bsloadlibs); # strip empty libs
43 print STDOUT " bsloadlibs=@bsloadlibs\n" if $Verbose;
45 # We need DynaLoader here because we and/or the *_BS file may
46 # call dl_findfile(). We don't say `use' here because when
47 # first building perl extensions the DynaLoader will not have
48 # been built when MakeMaker gets first used.
51 rename "$baseext.bs", "$baseext.bso"
54 if (-f "${baseext}_BS"){
56 package DynaLoader; # execute code as if in DynaLoader
57 local($osname, $dlsrc) = (); # avoid warnings
58 ($osname, $dlsrc) = @Config::Config{qw(osname dlsrc)};
65 if ($Config{'dlsrc'} =~ /^dl_dld/){
67 push(@dl_resolve_using, dl_findfile('-lc'));
70 my(@all) = (@bsloadlibs, @DynaLoader::dl_resolve_using);
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";
87 print BS " qw(@all);\n";
89 # write extra code if *_BS says so
90 print BS $DynaLoader::bscode if $DynaLoader::bscode;