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* cppfiles.c (_cpp_pop_file_buffer): Return void. Move file change and include code to _cpp_pop_buffer. * cpphash.h (struct pending_option): Predeclare. (struct cpp_reader): New member next_include_file. (_cpp_pop_file_buffer): Update. (_cpp_push_next_buffer): Update, rename. * cppinit.c (cpp_destroy): Free include chain and pending here. (cpp_finish_options): Simplify. (_cpp_push_next_buffer): Rename and clean up. * cpplib.c (cpp_pop_buffer): Move code from _cpp_pop_file_buffer. Clarify. * cppmacro.c (cpp_scan_nooutput): Set return_at_eof here. From-SVN: r52621
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