[Summary view] [Print] [Text view]

   1  package ExtUtils::Mkbootstrap;
   2  
   3  # There's just too much Dynaloader incest here to turn on strict vars.
   4  use strict 'refs';
   5  
   6  use vars qw($VERSION @ISA @EXPORT);
   7  $VERSION = '6.42';
   8  
   9  require Exporter;
  10  @ISA = ('Exporter');
  11  @EXPORT = ('&Mkbootstrap');
  12  
  13  use Config;
  14  
  15  use vars qw($Verbose);
  16  
  17  
  18  sub Mkbootstrap {
  19      my($baseext, @bsloadlibs)=@_;
  20      @bsloadlibs = grep($_, @bsloadlibs); # strip empty libs
  21  
  22      print STDOUT "    bsloadlibs=@bsloadlibs\n" if $Verbose;
  23  
  24      # We need DynaLoader here because we and/or the *_BS file may
  25      # call dl_findfile(). We don't say `use' here because when
  26      # first building perl extensions the DynaLoader will not have
  27      # been built when MakeMaker gets first used.
  28      require DynaLoader;
  29  
  30      rename "$baseext.bs", "$baseext.bso"
  31        if -s "$baseext.bs";
  32  
  33      if (-f "$baseext}_BS"){
  34      $_ = "$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)};
  38      $bscode = "";
  39      unshift @INC, ".";
  40      require $_;
  41      shift @INC;
  42      }
  43  
  44      if ($Config{'dlsrc'} =~ /^dl_dld/){
  45      package DynaLoader;
  46      push(@dl_resolve_using, dl_findfile('-lc'));
  47      }
  48  
  49      my(@all) = (@bsloadlibs, @DynaLoader::dl_resolve_using);
  50      my($method) = '';
  51      if (@all){
  52      open BS, ">$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";
  65      }else{
  66          print BS "  qw(@all);\n";
  67      }
  68      # write extra code if *_BS says so
  69      print BS $DynaLoader::bscode if $DynaLoader::bscode;
  70      print BS "\n1;\n";
  71      close BS;
  72      }
  73  }
  74  
  75  1;
  76  
  77  __END__
  78  
  79  =head1 NAME
  80  
  81  ExtUtils::Mkbootstrap - make a bootstrap file for use by DynaLoader
  82  
  83  =head1 SYNOPSIS
  84  
  85  C<Mkbootstrap>
  86  
  87  =head1 DESCRIPTION
  88  
  89  Mkbootstrap typically gets called from an extension Makefile.
  90  
  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.
  94  
  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 $BSLOADLIBS, which was computed by
  98  ExtUtils::Liblist::ext(). If this array still is empty, we do nothing,
  99  else we write a .bs file with an C<@DynaLoader::dl_resolve_using>
 100  array.
 101  
 102  The C<*_BS> file can put some code into the generated C<*.bs> file by
 103  placing it in C<$bscode>. This is a handy 'escape' mechanism that may
 104  prove useful in complex situations.
 105  
 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.
 109  
 110  =cut