===================================================================
@@ -616,9 +616,14 @@ constexpr_fn_retval (tree body)
return break_out_target_exprs (TREE_OPERAND (body, 0));
case DECL_EXPR:
- if (TREE_CODE (DECL_EXPR_DECL (body)) == USING_DECL)
- return NULL_TREE;
- return error_mark_node;
+ {
+ tree decl = DECL_EXPR_DECL (body);
+ if (TREE_CODE (decl) == USING_DECL
+ /* Accept __func__, __FUNCTION__, and __PRETTY_FUNCTION__. */
+ || DECL_ARTIFICIAL (decl))
+ return NULL_TREE;
+ return error_mark_node;
+ }
case CLEANUP_POINT_EXPR:
return constexpr_fn_retval (TREE_OPERAND (body, 0));
===================================================================
@@ -0,0 +1,6 @@
+// PR c++/55425
+// { dg-do compile { target c++11 } }
+
+constexpr const char* x() { return __func__; }
+constexpr const char* y() { return __FUNCTION__; }
+constexpr const char* z() { return __PRETTY_FUNCTION__; }