cpperror.c (cpp_file_line_for_message): If 'line' is zero, just print "<command line>".
* cpperror.c (cpp_file_line_for_message): If 'line' is zero, just print "<command line>". If 'filename' is null or an empty string, print "<stdin>" for the filename. * cpplib.c (do_define): Don't print the 'location of the previous definition' message if we're still parsing the command line. (cpp_pedwarn_with_file_and_line): Always call cpp_file_line_for_message. From-SVN: r31697
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