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* include/cpplib.h (struct cpp_options): Add new boolean flag warn_builtin_macro_redefined. * init.c (cpp_create_reader): Initialize warn_builtin_macro_redefined. * (struct builtin_operator): Split out from previous struct builtin, enhance extra const correctness. * (struct builtin_macro): Split out from previous struct builtin, add new always_warn_if_redefined flag, enhance const correctness. * (mark_named_operators): Use struct builtin_operator. * (cpp_init_special_builtins): Use struct builtin_macro, add NODE_WARN to builtins selectively. * macro.c (warn_of_redefinition): Return false if a builtin macro is not flagged with NODE_WARN. * c-opts.c (c_common_handle_option): Add handling for -Wbuiltin-macro-redefined command line option. * c.opt: Added builtin-macro-redefined option. * doc/invoke.texi (Warning Options): Add -Wbuiltin-macro-redefined documentation. * gcc.dg/builtin-redefine.c: New. From-SVN: r140461
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