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PR c++/57979 * init.c (decl_really_constant_value): Rename from integral_constant_value. (scalar_constant_value): Similar but limited to scalar results. (decl_constant_value_safe): Remove. (constant_value_1): Respect return_aggregate_cst_ok_p. * typeck.c (decay_conversion): Use scalar_constant_value. * call.c (convert_like_real): Likewise. * cvt.c (ocp_convert): No need to check CLASS_TYPE_P. * typeck.c (decay_conversion): Or ARRAY_TYPE. * constexpr.c (struct constexpr_ctx): Add strict field. (cxx_eval_constant_expression) [VAR_DECL]: Use it to select between decl_constant_value and decl_really_constant_value. (cxx_eval_outermost_constant_expr): Add strict parm. (maybe_constant_init): Not strict. (potential_constant_expression_1): Add strict parm. Shorten most internal calls with RECUR macro. * cp-tree.h, pt.c, semantics.c: Adjust. From-SVN: r217814
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