The core's magic vtables are global constants, so aren't part of the size.

[p5sagit/Devel-Size.git] / Makefile.PL

diff --git a/Makefile.PL b/Makefile.PL
index d1b6a31..7e550ee 100644 (file)
--- a/Makefile.PL
+++ b/Makefile.PL
@@ -1,15 +1,52 @@
+#!/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",
   ($ExtUtils::MakeMaker::VERSION >= 6.47 ? (MIN_PERL_VERSION => '5.008') : ()),
   ($ExtUtils::MakeMaker::VERSION >= 6.31 ? (LICENSE => 'perl') : ()),
+  realclean => {FILES=> $vtable_file},
 );