Add a warning flag for ext_embedded_directive. gcc considers this undefined

behaviour to be an error, so it's useful to be able to make it an error in clang
too.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@146755 91177308-0d34-0410-b5e6-96231b3b80d8

include/clang/Basic/DiagnosticLexKinds.td

@@ -203,7 +203,8 @@ def warn_cxx98_compat_variadic_macro : Warning<
 def ext_named_variadic_macro : Extension<
   "named variadic macros are a GNU extension">, InGroup<VariadicMacros>;
 def ext_embedded_directive : Extension<
-  "embedding a directive within macro arguments is not portable">;
+  "embedding a directive within macro arguments is not portable">,
+  InGroup<DiagGroup<"embedded-directive">>;
 def ext_missing_varargs_arg : Extension<
   "varargs argument missing, but tolerated as an extension">;
 def ext_empty_fnmacro_arg : Extension<

test/Misc/warning-flags.c

@@ -17,7 +17,7 @@ This test serves two purposes:
 
 The list of warnings below should NEVER grow.  It should gradually shrink to 0.
 
-CHECK: Warnings without flags (271):
+CHECK: Warnings without flags (270):
 CHECK-NEXT:   ext_anon_param_requires_type_specifier
 CHECK-NEXT:   ext_anonymous_struct_union_qualified
 CHECK-NEXT:   ext_array_init_copy
@@ -28,7 +28,6 @@ CHECK-NEXT:   ext_designated_init
 CHECK-NEXT:   ext_designated_init_cxx
 CHECK-NEXT:   ext_duplicate_declspec
 CHECK-NEXT:   ext_ellipsis_exception_spec
-CHECK-NEXT:   ext_embedded_directive
 CHECK-NEXT:   ext_empty_fnmacro_arg
 CHECK-NEXT:   ext_empty_source_file
 CHECK-NEXT:   ext_enum_friend