--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/g++.dg/warn/Wstringop-truncation-2.C	Thu Oct 25 07:37:49 2018 +0900
@@ -0,0 +1,164 @@
+// PR tree-optimization/84468 - bogus -Wstringop-truncation despite
+// assignment after conditional strncpy
+// Compile with -g to verify the warning deals properly with debug
+// statements.
+// { dg-do compile }
+// { dg-options "-O2 -Wstringop-truncation -g" }
+
+extern "C" char* strncpy (char*, const char*, __SIZE_TYPE__);
+
+char d[3];
+
+void g ();
+
+void fnowarn1 (const char *s)
+{
+  // Update dummy but never actually use it so it's eliminated
+  // but causes debugging statements to be emitted for each
+  // modification.
+  int dummy = 0;
+
+  try
+    {
+      g ();
+      strncpy (d, s, sizeof d);   // { dg-bogus "\\\[-Wstringop-truncation]" }
+      ++dummy;
+    }
+  catch (...)
+    {
+      ++dummy;
+      d[0] = 0;
+    }
+
+  ++dummy;
+  d[sizeof d - 1] = 0;
+}
+
+void fnowarn2 (const char *s)
+{
+  int dummy = 0;
+
+  try
+    {
+      g ();
+      strncpy (d, s, sizeof d);
+      ++dummy;
+    }
+  catch (...)
+    {
+      ++dummy;
+      return;
+    }
+
+  ++dummy;
+  d[sizeof d - 1] = 0;
+}
+
+void fnowarn3 (const char *s)
+{
+  int dummy = 0;
+
+  try
+    {
+      g ();
+      strncpy (d, s, sizeof d);
+      ++dummy;
+      try
+	{
+	  ++dummy;
+	  d[sizeof d - 1] = 0;
+	  g ();
+	}
+      catch (...)
+	{
+	  ++dummy;
+	}
+    }
+  catch (...)
+    {
+      ++dummy;
+      return;
+    }
+
+  ++dummy;
+  d[sizeof d - 1] = 0;
+}
+
+void fnowarn4 (const char *s)
+{
+  int dummy = 0;
+
+  try
+    {
+      g ();
+    }
+  catch (...)
+    {
+      strncpy (d, s, sizeof d);   // { dg-bogus "\\\[-Wstringop-truncation]" "bug 84468" { xfail *-*-*} }
+      ++dummy;
+    }
+
+  ++dummy;
+  d[sizeof d - 1] = 0;
+}
+
+void fwarn1 (const char *s)
+{
+  int dummy = 0;
+
+  try
+    {
+      ++dummy;
+      g ();
+      ++dummy;
+      strncpy (d, s, sizeof d);   // { dg-warning "\\\[-Wstringop-truncation]" }
+      ++dummy;
+    }
+  catch (...)
+    {
+      ++dummy;
+    }
+
+  ++dummy;
+}
+
+void fwarn2 (const char *s)
+{
+  int dummy = 0;
+
+  try
+    {
+      ++dummy;
+      strncpy (d, s, sizeof d);   // { dg-warning "\\\[-Wstringop-truncation]" }
+      ++dummy;
+      g ();
+      ++dummy;
+    }
+  catch (...)
+    {
+      ++dummy;
+    }
+
+  ++dummy;
+}
+
+void fwarn3 (const char *s)
+{
+  int dummy = 0;
+
+  try
+    {
+      ++dummy;
+      g ();
+      ++dummy;
+      strncpy (d, s, sizeof d);   // { dg-warning "\\\[-Wstringop-truncation]" }
+      ++dummy;
+    }
+  catch (...)
+    {
+      ++dummy;
+      d[0] = 0;
+    }
+
+  ++dummy;
+}