gcc/ChangeLog:
     * doc/cpp.texi (__TIMESTAMP__): Document.

libcpp/ChangeLog:
     * macro.c (_cpp_builtin_macro_text): Handle BT_TIMESTAMP.
     * files.c (_cpp_get_file_stat): New function.
     * include/cpplib.h (builtin_type): Add BT_TIMESTAMP.
     * init.c (builtin_array): Add support for __TIMESTAMP__/BT_TIMESTAMP.
     * internal.h (_cpp_get_file_stat): Prototype.
     (struct cpp_buffer): Add timestamp.

gcc/testsuite/ChangeLog:
     * gcc.dg/cpp/undef3.c: New test.
     * gcc.dg/cpp/trad/builtins2.c: New test.



git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@111232 138bc75d-0d04-0410-961f-82ee72b054a4