C++ PATCH for c++/65687 (typedefs and attribute deprecated)

C++ PATCH for c++/65687 (typedefs and attribute deprecated)

[Jason Merrill]

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This BZ asks that the C++ front end follow the behavior of the C front 
end in handling typedefs that involve deprecated types: we should warn 
when defining the typedef, not when using it.  This seems reasonable, 
particularly since the C front end works this way.

Tested x86_64-pc-linux-gnu, applying to trunk.

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commit a2de40417b69ee1a42396ecbe8ca7e02a7541160
Author: Jason Merrill <jason@redhat.com>
Date:   Thu Jan 21 14:45:05 2016 -0500

    	PR c++/65687
    	* decl.c (type_is_deprecated): Don't look into a typedef.

diff --git a/gcc/cp/decl.c b/gcc/cp/decl.c
index 020e9bd..f4604b6 100644
--- a/gcc/cp/decl.c
+++ b/gcc/cp/decl.c
@@ -11595,9 +11595,13 @@ type_is_deprecated (tree type)
   enum tree_code code;
   if (TREE_DEPRECATED (type))
     return type;
-  if (TYPE_NAME (type)
-      && TREE_DEPRECATED (TYPE_NAME (type)))
-    return type;
+  if (TYPE_NAME (type))
+    {
+      if (TREE_DEPRECATED (TYPE_NAME (type)))
+	return type;
+      else
+	return NULL_TREE;
+    }
 
   /* Do warn about using typedefs to a deprecated class.  */
   if (OVERLOAD_TYPE_P (type) && type != TYPE_MAIN_VARIANT (type))
diff --git a/gcc/testsuite/g++.dg/warn/deprecated-10.C b/gcc/testsuite/g++.dg/warn/deprecated-10.C
new file mode 100644
index 0000000..55cdf3d
--- /dev/null
+++ b/gcc/testsuite/g++.dg/warn/deprecated-10.C
@@ -0,0 +1,14 @@
+// PR c++/65687
+
+typedef struct old_visible_stuff *opaquePointer;
+
+struct old_visible_stuff {
+  int things_we_no_longer;
+  int wish_to_expose;
+} __attribute__((__deprecated__("do not refer to this, the layout might change")));
+
+typedef struct old_visible_stuff *another; // { dg-warning "deprecated" }
+
+opaquePointer runtime_function (opaquePointer someObject);
+
+opaquePointer bad_runtime_call (struct old_visible_stuff *otherObject); // { dg-warning "deprecated" }