@@ -2834,7 +2834,7 @@ cxx_fold_pointer_plus_expression (const constexpr_ctx *ctx, tree t,
static tree
cxx_eval_binary_expression (const constexpr_ctx *ctx, tree t,
- bool /*lval*/,
+ bool lval,
bool *non_constant_p, bool *overflow_p)
{
tree r = NULL_TREE;
@@ -2902,7 +2902,7 @@ cxx_eval_binary_expression (const constexpr_ctx *ctx, tree t,
else if (code == SPACESHIP_EXPR)
{
r = genericize_spaceship (type, lhs, rhs);
- r = cxx_eval_constant_expression (ctx, r, false, non_constant_p,
+ r = cxx_eval_constant_expression (ctx, r, lval, non_constant_p,
overflow_p);
}
@@ -6686,13 +6686,11 @@ maybe_constant_value (tree t, tree decl, bool manifestly_const_eval,
r = unshare_expr_without_location (r);
protected_set_expr_location (r, EXPR_LOCATION (t));
}
- if (r != t || TREE_CONSTANT (t) || !manifestly_const_eval)
- return r;
- /* If we cached this as non-constant and we need a constant value, try
- again; we might have failed before due to UID_SENSITIVE. */
+ return r;
}
- r = cxx_eval_outermost_constant_expr (t, true, true, false, false, decl);
+ r = cxx_eval_outermost_constant_expr (t, true, true, false, false,
+ decl, uid_sensitive);
gcc_checking_assert (r == t
|| CONVERT_EXPR_P (t)
|| TREE_CODE (t) == VIEW_CONVERT_EXPR
@@ -1075,6 +1075,9 @@ genericize_spaceship (tree type, tree op0, tree op1)
comp = fold_build2 (EQ_EXPR, boolean_type_node, op0, op1);
r = fold_build3 (COND_EXPR, type, comp, eq, r);
+ /* Wrap the whole thing in a TARGET_EXPR like build_conditional_expr_1. */
+ r = get_target_expr (r);
+
return r;
}
new file mode 100644
@@ -0,0 +1,14 @@
+// PR c++/93650
+// { dg-do compile { target c++2a } }
+
+namespace std {
+ using type = enum _Ord { less };
+ class strong_ordering {
+ type _M_value;
+ constexpr strong_ordering(_Ord) : _M_value() {}
+ static const strong_ordering less;
+ static strong_ordering equal;
+ static strong_ordering greater;
+ } constexpr strong_ordering::less(_Ord::less);
+ auto v = 1 <=> 2;
+}