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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 = '7.44';
$VERSION =~ tr/_//d;
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
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