[diagtool] Re-add show-enabled, minimizing the code pulled in from Frontend.
Now correctly builds with both GNU make and CMake.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@157932 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/Misc/warning-flags-enabled.c b/test/Misc/warning-flags-enabled.c
new file mode 100644
index 0000000..359ba70
--- /dev/null
+++ b/test/Misc/warning-flags-enabled.c
@@ -0,0 +1,27 @@
+// RUN: diagtool show-enabled %s 2>&1 | FileCheck %s
+//
+// This shows warnings which are on by default.
+// We just check a few to make sure it's doing something sensible.
+//
+// CHECK: warn_condition_is_assignment
+// CHECK: warn_null_arg
+// CHECK: warn_unterminated_string
+
+
+// RUN: diagtool show-enabled -Wno-everything %s 2>&1 | count 0
+
+
+// RUN: diagtool show-enabled -Wno-everything -Wobjc-root-class %s 2>&1 | FileCheck -check-prefix CHECK-WARN %s
+// RUN: diagtool show-enabled -Wno-everything -Werror=objc-root-class %s 2>&1 | FileCheck -check-prefix CHECK-ERROR %s
+// RUN: diagtool show-enabled -Wno-everything -Wfatal-errors=objc-root-class %s 2>&1 | FileCheck -check-prefix CHECK-FATAL %s
+//
+// CHECK-WARN: W warn_objc_root_class_missing [-Wobjc-root-class]
+// CHECK-ERROR: E warn_objc_root_class_missing [-Wobjc-root-class]
+// CHECK-FATAL: F warn_objc_root_class_missing [-Wobjc-root-class]
+
+// RUN: diagtool show-enabled --no-levels -Wno-everything -Wobjc-root-class %s 2>&1 | FileCheck -check-prefix CHECK-NO-LEVELS %s
+//
+// CHECK-NO-LEVELS-NOT: W
+// CHECK-NO-LEVELS-NOT: E
+// CHECK-NO-LEVELS-NOT: F
+// CHECK-NO-LEVELS: warn_objc_root_class_missing [-Wobjc-root-class]