[PATCH] [5/6 Regression] Fix PR c++/66857

[Patrick Palka]

gcc/cp/ChangeLog:

        PR c++/66857
        * cvt.c (ocp_convert): Don't call scalar_constant_value when
        converting to a class type.

gcc/testsuite/ChangeLog:

        PR c++/66857
        * g++.dg/init/pr66857.C: New test.
---
 gcc/cp/cvt.c                        |  3 ++-
 gcc/testsuite/g++.dg/init/pr66857.C | 19 +++++++++++++++++++
 2 files changed, 21 insertions(+), 1 deletion(-)
 create mode 100644 gcc/testsuite/g++.dg/init/pr66857.C

diff --git a/gcc/cp/cvt.c b/gcc/cp/cvt.c
index 13bc1f7..6d4bd9a 100644
--- a/gcc/cp/cvt.c
+++ b/gcc/cp/cvt.c
@@ -687,7 +687,8 @@ ocp_convert (tree type, tree expr, int convtype, int flags,
     }
 
   /* FIXME remove when moving to c_fully_fold model.  */
-  e = scalar_constant_value (e);
+  if (!CLASS_TYPE_P (type))
+    e = scalar_constant_value (e);
   if (error_operand_p (e))
     return error_mark_node;
 
diff --git a/gcc/testsuite/g++.dg/init/pr66857.C 
b/gcc/testsuite/g++.dg/init/pr66857.C
new file mode 100644
index 0000000..43b0927
--- /dev/null
+++ b/gcc/testsuite/g++.dg/init/pr66857.C
@@ -0,0 +1,19 @@
+// PR c++/66857
+// { dg-do run }
+
+const int i = 0;
+
+struct Test
+{
+  Test (const int &rhs)
+  {
+    if (&rhs != &i)
+      __builtin_abort ();
+  }
+};
+
+int
+main (void)
+{
+  Test test = i;
+}
-- 
2.5.0.rc2.22.g69b1679.dirty