Backported from commit 88e08c43d0200a4b06a298b7d2541965eebc0afe:
Removed the ChangeLog part.

From: "commit-queue@webkit.org"
 <commit-queue@webkit.org@268f45cc-cd09-0410-ab3c-d52691b4dbfc>
Date: Mon, 18 Apr 2011 06:53:23 +0000
Subject: [PATCH] 2011-04-17  Thierry Reding 
 <thierry.reding@avionic-design.de>

        Reviewed by Adam Barth.

        Fix build with GCC 4.6.

        * dom/make_names.pl: Execute preprocessor without the -P option. The
        preprocessor in GCC 4.6 eats empty lines, effectively breaking the
        parsing performed by this script. Dropping the -P option when invoking
        the preprocessor keeps the empty lines but as a side-effect also adds
        additional linemarkers.

        From the cpp manpage:

          -P  Inhibit generation of linemarkers in the output from the
              preprocessor. This might be useful when running the preprocessor
              on something that is not C code, and will be sent to a program
              which might be confused by the linemarkers.

        The linemarkers are not problematic, however, because the script
        properly handles them by ignoring all lines starting with a #.

diff --git a/WebCore/dom/make_names.pl b/WebCore/dom/make_names.pl
index 836137e..50386e0 100755
--- a/WebCore/dom/make_names.pl
+++ b/WebCore/dom/make_names.pl
@@ -54,7 +54,7 @@ if ($ENV{CC}) {
 } else {
     $gccLocation = "/usr/bin/gcc";
 }
-my $preprocessor = $gccLocation . " -E -P -x c++";
+my $preprocessor = $gccLocation . " -E -x c++";
 
 GetOptions(
     'tags=s' => \$tagsFile, 
-- 
1.7.11.4