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This patch provides a way to clone a pretty_printer. This is needed so that we can capture text in a label_text and make layout decisions based on it, using the policy of global_dc's printer, whilst within a call to diagnostic_show_locus. We can't print with the pretty_printer itself within a call to diagnostic_show_locus since it has partly-buffered content. gcc/c-family/ChangeLog: * c-pretty-print.c (c_pretty_printer::clone): New vfunc implementation. * c-pretty-print.h (c_pretty_printer::clone): New vfunc decl. gcc/cp/ChangeLog: * cxx-pretty-print.c (cxx_pretty_printer::clone): New vfunc implementation. * cxx-pretty-print.h (cxx_pretty_printer::clone): New vfunc decl. * error.c (cxx_format_postprocessor::clone): New vfunc. gcc/ChangeLog: * pretty-print.c (pretty_printer::pretty_printer): New copy-ctor. (pretty_printer::clone): New vfunc implementation. * pretty-print.h (format_postprocessor::clone): New pure vfunc decl. (pretty_printer::pretty_printer): New copy-ctor decl. (pretty_printer::clone): New vfunc decl. From-SVN: r279244
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