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When diagnostic messages use pretty-printer formats like %D or %E the pp_printf invocation can end up in tree pretty-printers which then have to avoid using pp_printf themselves since this function is not re-entrant. The following removes all pp_printf uses from tree-pretty-print.c fixing the observed malformed diagnostics. It also poisons the identifier so new uses are less likely to creep in. 2021-03-04 Richard Biener <rguenther@suse.de> PR middle-end/97855 * tree-pretty-print.c: Poison pp_printf. (dump_decl_name): Avoid use of pp_printf. (dump_block_node): Likewise. (dump_generic_node): Likewise.
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