re PR tree-optimization/51117 (rev.181172 causes glibc build failure)

	PR tree-optimization/51117
	* g++.dg/opt/pr51117.C: New test.

From-SVN: r182379

gcc/testsuite/ChangeLog

+2011-12-15  Jakub Jelinek  <jakub@redhat.com>
+
+	PR tree-optimization/51117
+	* g++.dg/opt/pr51117.C: New test.
+
 2011-12-15  Romain Geissler  <romain.geissler@gmail.com>
 
 	* gcc.c-torture/execute/builtins/chk.h (stpncpy, stpncpy_disallowed):

gcc/testsuite/g++.dg/opt/pr51117.C

+// PR tree-optimization/51117
+// { dg-do compile }
+// { dg-options "-O2 -fexceptions" }
+
+struct A { char buf[64]; };
+void bar (A *);
+
+int
+foo ()
+{
+  A c;
+  bar (&c);
+  try
+  {
+    {
+      A a;
+      bar (&a);
+      if (a.buf[13])
+        throw 1;
+      else if (a.buf[52])
+        throw 3;
+    }
+    {
+      A b;
+      bar (&b);
+      if (b.buf[13])
+        throw 2;
+    }
+  }
+  catch ( ...)
+  {
+    return 1;
+  }
+  return 0;
+}
+
+// { dg-final { scan-assembler-not "__cxa_rethrow" } }