1 package ExtUtils::Mkbootstrap;
3 # There's just too much Dynaloader incest here to turn on strict vars.
6 use vars qw($VERSION @ISA @EXPORT);
11 @EXPORT = ('&Mkbootstrap');
15 use vars qw($Verbose);
19 my($baseext, @bsloadlibs)=@_;
20 @bsloadlibs = grep($_, @bsloadlibs); # strip empty libs
22 print STDOUT " bsloadlibs=@bsloadlibs\n" if $Verbose;
24 # We need DynaLoader here because we and/or the *_BS file may
25 # call dl_findfile(). We don't say `use' here because when
26 # first building perl extensions the DynaLoader will not have
27 # been built when MakeMaker gets first used.
30 rename "$baseext.bs", "$baseext.bso"
33 if (-f "${baseext}_BS"){
35 package DynaLoader; # execute code as if in DynaLoader
36 local($osname, $dlsrc) = (); # avoid warnings
37 ($osname, $dlsrc) = @Config::Config{qw(osname dlsrc)};
44 if ($Config{'dlsrc'} =~ /^dl_dld/){
46 push(@dl_resolve_using, dl_findfile('-lc'));
49 my(@all) = (@bsloadlibs, @DynaLoader::dl_resolve_using);
52 open BS, ">$baseext.bs"
53 or die "Unable to open $baseext.bs: $!";
54 print STDOUT "Writing $baseext.bs\n";
55 print STDOUT " containing: @all" if $Verbose;
56 print BS "# $baseext DynaLoader bootstrap file for $^O architecture.\n";
57 print BS "# Do not edit this file, changes will be lost.\n";
58 print BS "# This file was automatically generated by the\n";
59 print BS "# Mkbootstrap routine in ExtUtils::Mkbootstrap (v$VERSION).\n";
60 print BS "\@DynaLoader::dl_resolve_using = ";
61 # If @all contains names in the form -lxxx or -Lxxx then it's asking for
62 # runtime library location so we automatically add a call to dl_findfile()
63 if (" @all" =~ m/ -[lLR]/){
64 print BS " dl_findfile(qw(\n @all\n ));\n";
66 print BS " qw(@all);\n";
68 # write extra code if *_BS says so
69 print BS $DynaLoader::bscode if $DynaLoader::bscode;
81 ExtUtils::Mkbootstrap - make a bootstrap file for use by DynaLoader
89 Mkbootstrap typically gets called from an extension Makefile.
91 There is no C<*.bs> file supplied with the extension. Instead, there may
92 be a C<*_BS> file which has code for the special cases, like posix for
93 berkeley db on the NeXT.
95 This file will get parsed, and produce a maybe empty
96 C<@DynaLoader::dl_resolve_using> array for the current architecture.
97 That will be extended by $BSLOADLIBS, which was computed by
98 ExtUtils::Liblist::ext(). If this array still is empty, we do nothing,
99 else we write a .bs file with an C<@DynaLoader::dl_resolve_using>
102 The C<*_BS> file can put some code into the generated C<*.bs> file by
103 placing it in C<$bscode>. This is a handy 'escape' mechanism that may
104 prove useful in complex situations.
106 If @DynaLoader::dl_resolve_using contains C<-L*> or C<-l*> entries then
107 Mkbootstrap will automatically add a dl_findfile() call to the
108 generated C<*.bs> file.