1 | package ExtUtils::Mkbootstrap;
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2 |
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3 | $VERSION = 1.15;
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4 |
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5 | use Config;
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6 | use Exporter;
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7 | @ISA=('Exporter');
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8 | @EXPORT='&Mkbootstrap';
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9 |
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10 | sub Mkbootstrap {
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11 | my($baseext, @bsloadlibs)=@_;
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12 | @bsloadlibs = grep($_, @bsloadlibs); # strip empty libs
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13 |
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14 | print STDOUT " bsloadlibs=@bsloadlibs\n" if $Verbose;
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15 |
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16 | # We need DynaLoader here because we and/or the *_BS file may
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17 | # call dl_findfile(). We don't say `use' here because when
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18 | # first building perl extensions the DynaLoader will not have
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19 | # been built when MakeMaker gets first used.
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20 | require DynaLoader;
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21 |
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22 | rename "$baseext.bs", "$baseext.bso"
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23 | if -s "$baseext.bs";
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24 |
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25 | if (-f "${baseext}_BS"){
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26 | $_ = "${baseext}_BS";
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27 | package DynaLoader; # execute code as if in DynaLoader
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28 | local($osname, $dlsrc) = (); # avoid warnings
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29 | ($osname, $dlsrc) = @Config::Config{qw(osname dlsrc)};
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30 | $bscode = "";
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31 | unshift @INC, ".";
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32 | require $_;
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33 | shift @INC;
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34 | }
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35 |
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36 | if ($Config{'dlsrc'} =~ /^dl_dld/){
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37 | package DynaLoader;
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38 | push(@dl_resolve_using, dl_findfile('-lc'));
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39 | }
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40 |
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41 | my(@all) = (@bsloadlibs, @DynaLoader::dl_resolve_using);
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42 | my($method) = '';
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43 | if (@all){
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44 | open BS, ">$baseext.bs"
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45 | or die "Unable to open $baseext.bs: $!";
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46 | print STDOUT "Writing $baseext.bs\n";
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47 | print STDOUT " containing: @all" if $Verbose;
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48 | print BS "# $baseext DynaLoader bootstrap file for $^O architecture.\n";
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49 | print BS "# Do not edit this file, changes will be lost.\n";
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50 | print BS "# This file was automatically generated by the\n";
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51 | print BS "# Mkbootstrap routine in ExtUtils::Mkbootstrap (v$VERSION).\n";
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52 | print BS "\@DynaLoader::dl_resolve_using = ";
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53 | # If @all contains names in the form -lxxx or -Lxxx then it's asking for
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54 | # runtime library location so we automatically add a call to dl_findfile()
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55 | if (" @all" =~ m/ -[lLR]/){
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56 | print BS " dl_findfile(qw(\n @all\n ));\n";
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57 | }else{
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58 | print BS " qw(@all);\n";
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59 | }
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60 | # write extra code if *_BS says so
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61 | print BS $DynaLoader::bscode if $DynaLoader::bscode;
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62 | print BS "\n1;\n";
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63 | close BS;
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64 | }
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65 | }
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66 |
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67 | 1;
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68 |
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69 | __END__
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70 |
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71 | =head1 NAME
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72 |
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73 | ExtUtils::Mkbootstrap - make a bootstrap file for use by DynaLoader
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74 |
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75 | =head1 SYNOPSIS
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76 |
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77 | C<Mkbootstrap>
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78 |
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79 | =head1 DESCRIPTION
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80 |
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81 | Mkbootstrap typically gets called from an extension Makefile.
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82 |
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83 | There is no C<*.bs> file supplied with the extension. Instead, there may
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84 | be a C<*_BS> file which has code for the special cases, like posix for
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85 | berkeley db on the NeXT.
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86 |
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87 | This file will get parsed, and produce a maybe empty
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88 | C<@DynaLoader::dl_resolve_using> array for the current architecture.
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89 | That will be extended by $BSLOADLIBS, which was computed by
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90 | ExtUtils::Liblist::ext(). If this array still is empty, we do nothing,
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91 | else we write a .bs file with an C<@DynaLoader::dl_resolve_using>
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92 | array.
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93 |
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94 | The C<*_BS> file can put some code into the generated C<*.bs> file by
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95 | placing it in C<$bscode>. This is a handy 'escape' mechanism that may
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96 | prove useful in complex situations.
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97 |
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98 | If @DynaLoader::dl_resolve_using contains C<-L*> or C<-l*> entries then
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99 | Mkbootstrap will automatically add a dl_findfile() call to the
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100 | generated C<*.bs> file.
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101 |
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102 | =cut
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