diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 0b327556aff0..e36e5bf729fb 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,10 @@
+2010-08-17  Kai Tietz  <kai.tietz@onevision.com>
+
+	* g++.dg/ext/uow-1.C: New.
+	* g++.dg/ext/uow-2.C: New.
+	* g++.dg/ext/uow-3.C: New.
+	* g++.dg/ext/uow-4.C: New.
+
 2010-08-17  Richard Guenther  <rguenther@suse.de>
 
 	PR testsuite/45266
diff --git a/gcc/testsuite/g++.dg/ext/uow-1.C b/gcc/testsuite/g++.dg/ext/uow-1.C
new file mode 100644
index 000000000000..fdf6aebb184f
--- /dev/null
+++ b/gcc/testsuite/g++.dg/ext/uow-1.C
@@ -0,0 +1,12 @@
+/* { dg-do compile } */
+/* { dg-options "-Wall" } */
+
+extern "C" {
+
+typedef int UOW;
+struct ABC {
+  UOW UOW;
+};
+
+}
+
diff --git a/gcc/testsuite/g++.dg/ext/uow-2.C b/gcc/testsuite/g++.dg/ext/uow-2.C
new file mode 100644
index 000000000000..79c1913f93f5
--- /dev/null
+++ b/gcc/testsuite/g++.dg/ext/uow-2.C
@@ -0,0 +1,8 @@
+/* { dg-do compile } */
+/* { dg-options "-Wall -fms-extensions" } */
+
+typedef int UOW;
+struct ABC {
+  UOW UOW;
+};
+
diff --git a/gcc/testsuite/g++.dg/ext/uow-3.C b/gcc/testsuite/g++.dg/ext/uow-3.C
new file mode 100644
index 000000000000..a2c2240214bf
--- /dev/null
+++ b/gcc/testsuite/g++.dg/ext/uow-3.C
@@ -0,0 +1,8 @@
+/* { dg-do compile } */
+/* { dg-options "-Wall" } */
+
+typedef int UOW;  /* { dg-error "" } */
+struct ABC {
+  UOW UOW; /* { dg-error "" } */
+};
+
diff --git a/gcc/testsuite/g++.dg/ext/uow-4.C b/gcc/testsuite/g++.dg/ext/uow-4.C
new file mode 100644
index 000000000000..21ed04a88ea5
--- /dev/null
+++ b/gcc/testsuite/g++.dg/ext/uow-4.C
@@ -0,0 +1,12 @@
+/* { dg-do compile } */
+/* { dg-options "-Wall -pedantic" } */
+
+extern "C" {
+
+typedef int UOW;  /* { dg-error "" } */
+struct ABC {
+  UOW UOW; /* { dg-error "" } */
+};
+
+}
+