obtained gcc-4.6.4.tar.bz2 from upstream website;upstream

verified gcc-4.6.4.tar.bz2.sig;
imported gcc-4.6.4 source tree from verified upstream tarball.

downloading a git-generated archive based on the 'upstream' tag
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if you have obtained the source via the command 'git clone',
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1 files changed, 20 insertions, 0 deletions

diff --git a/gcc/testsuite/gnat.dg/specs/unchecked_union.ads b/gcc/testsuite/gnat.dg/specs/unchecked_union.ads
new file mode 100644
index 000000000..260f781d8
--- /dev/null
+++ b/gcc/testsuite/gnat.dg/specs/unchecked_union.ads
@@ -0,0 +1,20 @@
+-- PR ada/28591
+-- Reported by Martin Michlmayr <tbm@cyrius.com>
+
+-- { dg-do compile }
+-- { dg-options "-g" }
+
+with Interfaces; use Interfaces;
+
+package Unchecked_Union is
+   type Mode_Type is (Mode_B2);
+
+   type Value_Union (Mode : Mode_Type := Mode_B2) is record
+      case Mode is
+         when Mode_B2 =>
+            B2 : Integer_32;
+      end case;
+   end record;
+   pragma Unchecked_Union (Value_Union);
+
+end Unchecked_Union;