@@ -4172,6 +4172,12 @@ cxx_eval_outermost_constant_expr (tree t, bool allow_non_constant,
if (!non_constant_p && overflow_p)
non_constant_p = true;
+ /* Unshare the result unless it's a CONSTRUCTOR in which case it's already
+ unshared. */
+ bool should_unshare = true;
+ if (r == t || TREE_CODE (r) == CONSTRUCTOR)
+ should_unshare = false;
+
if (non_constant_p && !allow_non_constant)
return error_mark_node;
else if (non_constant_p && TREE_CONSTANT (r))
@@ -4188,6 +4194,9 @@ cxx_eval_outermost_constant_expr (tree t, bool allow_non_constant,
else if (non_constant_p || r == t)
return t;
+ if (should_unshare)
+ r = unshare_expr (r);
+
if (TREE_CODE (r) == CONSTRUCTOR && CLASS_TYPE_P (TREE_TYPE (r)))
{
if (TREE_CODE (t) == TARGET_EXPR
new file mode 100644
@@ -0,0 +1,21 @@
+// PR c++/70590
+// { dg-do compile { target c++11 } }
+// { dg-options "-O2" }
+
+int a;
+
+constexpr int *foo = &a;
+
+void blah (int *);
+
+int
+bar ()
+{
+ blah (foo);
+}
+
+int
+baz ()
+{
+ blah (foo);
+}
new file mode 100644
@@ -0,0 +1,25 @@
+// PR c++/70590
+// { dg-do compile { target c++11 } }
+// { dg-options "-O2" }
+
+int a;
+
+constexpr int *
+foo ()
+{
+ return &a;
+}
+
+void blah (int *);
+
+int
+bar ()
+{
+ blah (foo ());
+}
+
+int
+baz ()
+{
+ blah (foo ());
+}