I guess this is better now.

Changelog (gcc/c-family):

2011-06-10  Pierre Vittet <piervit@pvittet.com>

     * c-pragma.h (pragma_handler_1arg, pragma_handler_2arg): New handler.
     (gen_pragma_handler): New union.
     (internal_pragma_handler): New type.
     (c_register_pragma_with_data,
     c_register_pragma_with_expansion_and_data): New functions.
     * c-pragma.c (registered_pragmas, c_register_pragma_1,
     c_register_pragma, c_register_pragma_with_expansion,
     c_invoke_pragma_handler): Changed to work with internal_pragma_handler.
     (c_register_pragma_with_data,
     c_register_pragma_with_expansion_and_data): New functions.

Changelog (gcc/testsuite):

2011-06-10  Pierre Vittet <piervit@pvittet.com>

     * g++.dg/plugin/pragma_plugin_with_data.c: New test file.
     * g++.dg/plugin/pragma_plugin_with_data-test-1.C: New test file.
     * g++.dg/plugin/plugin.exp (plugin_test_list): Add the new test