-use ExtUtils::MakeMaker;\r
-use Config;\r
-\r
-my %options = ( \r
- NAME => 'Devel::Size',\r
- LIBS => $Config{cc} eq 'gcc' || $Config{cc} eq 'cc' ? ['-lstdc++'] : '',\r
- VERSION_FROM => 'lib/Devel/Size.pm',\r
- CC => $Config{cc} eq 'cl' ? 'cl' : 'g++',\r
-);\r
-\r
-WriteMakefile(%options);\r
+#!/usr/bin/perl -w
+use 5.008;
+use ExtUtils::MakeMaker;
+use strict;
+
+use Config;
+(unpack "B*", pack "N", $Config{ptrsize}) =~ /^0+1(0+)$/
+ or die "Your pointer size of $Config{ptrsize} is very confusing";
+my $ptr_bits = length $1;
+
+my $svh = "$Config{archlibexp}/CORE/perl.h";
+my $vtable_file = 'vtables.inc';
+
+my %vtables;
+open FH, "<$svh"
+ or die "Can't open $svh ($!) - is your perl install missing its headers?";
+while (<FH>) {
+ next unless /^\s+(PL_vtbl_[a-z]+),\s*$/ or /^EXT MGVTBL (PL_vtbl_[a-z]+) =/;
+ ++$vtables{$1};
+}
+warn "Didn't find any vtable names in $svh" unless %vtables;
+close FH;
+
+
+my %special = (
+ PL_vtbl_collxfrm => 'USE_LOCALE_COLLATE',
+ PL_vtbl_mutex => 'USE_5005THREADS',
+);
+
+open FH, ">$vtable_file" or die "Can't open $vtable_file: $!";
+foreach (sort keys %vtables) {
+ if ($special{$_}) {
+ print FH <<"EOT";
+#ifdef $special{$_}
+ &$_,
+#endif
+EOT
+ } else {
+ print FH " &$_,\n";
+ }
+}
+
+close FH or die "Error closing $vtable_file: $!";
+
+WriteMakefile(
+ NAME => 'Devel::Size',
+ VERSION_FROM => 'lib/Devel/Size.pm',
+ DEFINE => "-DALIGN_BITS=$ptr_bits",
+ (eval $ExtUtils::MakeMaker::VERSION >= 6.47 ? (MIN_PERL_VERSION => '5.008') : ()),
+ (eval $ExtUtils::MakeMaker::VERSION >= 6.31 ? (LICENSE => 'perl') : ()),
+ realclean => {FILES=> $vtable_file},
+);