PR preprocessor/12935 preprocessor/12952 preprocessor/13046
* cpplib.c (prepare_directive_trad): Clear skipping only in
#if and #elif directives.
(do_undef): Call the handler even if the identifier is not a macro.
* cpptrad.c (scan_parameters): Emit an error message.
(_cpp_create_trad_definition): Remember the params list even on
failure.
* testsuite/gcc.dg/cpp/trad/macro.c: New tests.
From-SVN: r74562
