diff --git a/gcc/testsuite/gcc.dg/decl-global-ext.c b/gcc/testsuite/gcc.dg/decl-global-ext.c
new file mode 100644
index 000000000000..97ffa7c2f675
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/decl-global-ext.c
@@ -0,0 +1,13 @@
+int merror = 0;
+extern int merror;
+
+void mtherr (int code)       
+{
+  merror = code + 1;
+}
+
+int main()
+{
+	mtherr(7);
+	return 0;
+}