https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91416
--- Comment #7 from Marek Polacek <mpolacek at gcc dot gnu.org> --- This sort of problem, accidentally collecting live data, is typically fixed by adding ++function_depth; // whatever --function_depth; Here we're in cp_parser_late_parsing_for_member, which calls start_preparsed_function (++function_depth) and then actually parses the body using cp_parser_function_definition_after_declarator. cp_parser_function_definition_after_declarator does 28077 /* Finish the function. */ 28078 fn = finish_function (inline_p); 28079 /* Generate code for it, if necessary. */ 28080 expand_or_defer_fn (fn); and finish_function does --function_depth. Then the call to expand_or_defer_fn triggers calling ggc_collect. This is similar to PR c++/88180.
