When the Source/WebCore/dom/make_names.pl script is run, the C preprocessor is run with the -P option. Apparently, the preprocessor behavior was changed in gcc 4.6 because running with the -P option makes it eat all empty lines, which gcc 4.5 doesn't. The make_names.pl script, however, relies on these empty lines when parsing. The attached patch removes the -P option when invoking the preprocessor. Apart from keeping the empty lines, this has the side-effect of outputting some preprocessor output. However these lines (starting with a #) are already being ignored by make_names.pl such that the preprocessed files can be properly parsed.