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PR c++/48948 * semantics.c (validate_constexpr_fundecl): Defer checking if an argument type is being defined. (is_valid_constexpr_fn): Add defer_ok parm. (cxx_eval_call_expression): Adjust. (check_deferred_constexpr_decls): New. (literal_type_p): Make sure type isn't being defined. (ensure_literal_type_for_constexpr_object): Handle type being defined. * cp-tree.h: Declare check_deferred_constexpr_decls. * decl.c (grokfndecl): Call validate_constexpr_fundecl here. (start_preparsed_function, cp_finish_decl): Not here. * class.c (finalize_literal_type_property): Don't call validate_constexpr_fundecl. (finish_struct): Call check_deferred_constexpr_decls. * pt.c (tsubst_decl): Call validate_constexpr_fundecl. (instantiate_class_template): Call check_deferred_constexpr_decls. From-SVN: r173683
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