PR c++/85062 - ICE with alignas in wrong place.

	* decl.c (grokdeclarator): Ignore attributes on type-specifiers
	here.

From-SVN: r258859

gcc/cp/ChangeLog

 2018-03-26  Jason Merrill  <jason@redhat.com>
 
+	PR c++/85062 - ICE with alignas in wrong place.
+	* decl.c (grokdeclarator): Ignore attributes on type-specifiers
+	here.
+
 	PR c++/85049 - ICE with __integer_pack.
 	* pt.c (unify_pack_expansion): Don't try to deduce generated packs.
 	* cp-tree.h (TEMPLATE_PARM_P): New.

gcc/cp/decl.c

@@ -10946,10 +10946,10 @@ grokdeclarator (const cp_declarator *declarator,
 
   if (declspecs->std_attributes)
     {
-      /* Apply the c++11 attributes to the type preceding them.  */
-      input_location = declspecs->locations[ds_std_attribute];
-      decl_attributes (&type, declspecs->std_attributes, 0);
-      input_location = saved_loc;
+      location_t attr_loc = declspecs->locations[ds_std_attribute];
+      if (warning_at (attr_loc, OPT_Wattributes, "attribute ignored"))
+	inform (attr_loc, "an attribute that appertains to a type-specifier "
+		"is ignored");
     }
 
   /* Determine the type of the entity declared by recurring on the

gcc/testsuite/g++.dg/cpp0x/alignas16.C

+// PR c++/85062
+// { dg-do compile { target c++11 } }
+
+template<typename... T> struct A
+{
+  int alignas(T...) i;		// { dg-warning "ignored" }
+};
+
+A<int> a;