-// Check that the compiler warns about unused options!.
-// RUN: tblgen -I $srcroot/include --gen-llvmc %s | grep extern
-// XFAIL: *
+// Check that warnings about unused options are really emitted.
+// This should fail because the output is printed on stderr.
+// RUN: tblgen -I %p/../../include --gen-llvmc %s |& grep "option '-Wall' has no effect!"
+// XFAIL: vg_leak