Control warnings about GNU extensions with -Wgnu, which has a subgroup
for GNU designated-initializer syntax (-Wgnu-designator).

llvm-svn: 99421
diff --git a/clang/test/Sema/warn-gnu-designators.c b/clang/test/Sema/warn-gnu-designators.c
new file mode 100644
index 0000000..d5ac8cf
--- /dev/null
+++ b/clang/test/Sema/warn-gnu-designators.c
@@ -0,0 +1,2 @@
+// RUN: %clang_cc1 -Wno-gnu-designator -verify %s
+struct { int x, y, z[12] } value = { x:17, .z [3 ... 5] = 7 };