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package ExtUtils::Mkbootstrap; # There's just too much Dynaloader incest here to turn on strict vars. use strict 'refs'; our $VERSION = '7.34'; $VERSION = eval $VERSION; require Exporter; our @ISA = ('Exporter'); our @EXPORT = ('&Mkbootstrap'); use Config; our $Verbose = 0; sub Mkbootstrap { my($baseext, @bsloadlibs)=@_; @bsloadlibs = grep($_, @bsloadlibs); # strip empty libs print " bsloadlibs=@bsloadlibs\n" if $Verbose; # We need DynaLoader here because we and/or the *_BS file may # call dl_findfile(). We don't say `use' here because when # first building perl extensions the DynaLoader will not have # been built when MakeMaker gets first used. require DynaLoader; rename "$baseext.bs", "$baseext.bso" if -s "$baseext.bs"; if (-f "${baseext}_BS"){ $_ = "${baseext}_BS"; package DynaLoader; # execute code as if in DynaLoader local($osname, $dlsrc) = (); # avoid warnings ($osname, $dlsrc) = @Config::Config{qw(osname dlsrc)}; $bscode = ""; unshift @INC, "."; require $_; shift @INC; } if ($Config{'dlsrc'} =~ /^dl_dld/){ package DynaLoader; push(@dl_resolve_using, dl_findfile('-lc')); } my(@all) = (@bsloadlibs, @DynaLoader::dl_resolve_using); my($method) = ''; if (@all || (defined $DynaLoader::bscode && length $DynaLoader::bscode)){ open my $bs, ">", "$baseext.bs" or die "Unable to open $baseext.bs: $!"; print "Writing $baseext.bs\n"; print " containing: @all" if $Verbose; print $bs "# $baseext DynaLoader bootstrap file for $^O architecture.\n"; print $bs "# Do not edit this file, changes will be lost.\n"; print $bs "# This file was automatically generated by the\n"; print $bs "# Mkbootstrap routine in ExtUtils::Mkbootstrap (v$VERSION).\n"; if (@all) { print $bs "\@DynaLoader::dl_resolve_using = "; # If @all contains names in the form -lxxx or -Lxxx then it's asking for # runtime library location so we automatically add a call to dl_findfile() if (" @all" =~ m/ -[lLR]/){ print $bs " dl_findfile(qw(\n @all\n ));\n"; } else { print $bs " qw(@all);\n"; } } # write extra code if *_BS says so print $bs $DynaLoader::bscode if $DynaLoader::bscode; print $bs "\n1;\n"; close $bs; } } 1; __END__ =head1 NAME ExtUtils::Mkbootstrap - make a bootstrap file for use by DynaLoader =head1 SYNOPSIS C<Mkbootstrap> =head1 DESCRIPTION Mkbootstrap typically gets called from an extension Makefile. There is no C<*.bs> file supplied with the extension. Instead, there may be a C<*_BS> file which has code for the special cases, like posix for berkeley db on the NeXT. This file will get parsed, and produce a maybe empty C<@DynaLoader::dl_resolve_using> array for the current architecture. That will be extended by $BSLOADLIBS, which was computed by ExtUtils::Liblist::ext(). If this array still is empty, we do nothing, else we write a .bs file with an C<@DynaLoader::dl_resolve_using> array. The C<*_BS> file can put some code into the generated C<*.bs> file by placing it in C<$bscode>. This is a handy 'escape' mechanism that may prove useful in complex situations. If @DynaLoader::dl_resolve_using contains C<-L*> or C<-l*> entries then Mkbootstrap will automatically add a dl_findfile() call to the generated C<*.bs> file. =cut
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