1 package ExtUtils::Mkbootstrap;
8 @EXPORT='&Mkbootstrap';
11 my($baseext, @bsloadlibs)=@_;
12 @bsloadlibs = grep($_, @bsloadlibs); # strip empty libs
14 print STDOUT " bsloadlibs=@bsloadlibs\n" if $Verbose;
16 # We need DynaLoader here because we and/or the *_BS file may
17 # call dl_findfile(). We don't say `use' here because when
18 # first building perl extensions the DynaLoader will not have
19 # been built when MakeMaker gets first used.
22 rename "$baseext.bs", "$baseext.bso"
25 if (-f "${baseext}_BS"){
27 package DynaLoader; # execute code as if in DynaLoader
28 local($osname, $dlsrc) = (); # avoid warnings
29 ($osname, $dlsrc) = @Config::Config{qw(osname dlsrc)};
36 if ($Config{'dlsrc'} =~ /^dl_dld/){
38 push(@dl_resolve_using, dl_findfile('-lc'));
41 my(@all) = (@bsloadlibs, @DynaLoader::dl_resolve_using);
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;
48 print BS "# $baseext DynaLoader bootstrap file for $^O architecture.\n";
49 print BS "# Do not edit this file, changes will be lost.\n";
50 print BS "# This file was automatically generated by the\n";
51 print BS "# Mkbootstrap routine in ExtUtils::Mkbootstrap (v$VERSION).\n";
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";
58 print BS " qw(@all);\n";
60 # write extra code if *_BS says so
61 print BS $DynaLoader::bscode if $DynaLoader::bscode;
73 ExtUtils::Mkbootstrap - make a bootstrap file for use by DynaLoader
81 Mkbootstrap typically gets called from an extension Makefile.
83 There is no C<*.bs> file supplied with the extension. Instead, there may
84 be a C<*_BS> file which has code for the special cases, like posix for
85 berkeley db on the NeXT.
87 This file will get parsed, and produce a maybe empty
88 C<@DynaLoader::dl_resolve_using> array for the current architecture.
89 That will be extended by $BSLOADLIBS, which was computed by
90 ExtUtils::Liblist::ext(). If this array still is empty, we do nothing,
91 else we write a .bs file with an C<@DynaLoader::dl_resolve_using>
94 The C<*_BS> file can put some code into the generated C<*.bs> file by
95 placing it in C<$bscode>. This is a handy 'escape' mechanism that may
96 prove useful in complex situations.
98 If @DynaLoader::dl_resolve_using contains C<-L*> or C<-l*> entries then
99 Mkbootstrap will automatically add a dl_findfile() call to the
100 generated C<*.bs> file.