Re: [C++ Patch] PR 79380

[Paolo Carlini]

... sorry, what I meant to propose uses 
INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P in the check, per the below. 
Both versions pass testing anyway, but the below seems more correct to me.

Thanks again,
Paolo.
////////////////////
Index: cp/typeck.c
===================================================================
--- cp/typeck.c (revision 245503)
+++ cp/typeck.c (working copy)
@@ -1795,6 +1795,12 @@ cxx_alignas_expr (tree e)
 
          the assignment-expression shall be an integral constant
         expression.  */
+
+  if (!INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (e)))
+    {
+      error ("%<alignas%> argument has non-integral type %qT", TREE_TYPE (e));
+      return error_mark_node;
+    }
   
   return cxx_constant_value (e);
 }
Index: testsuite/g++.dg/cpp0x/alignas8.C
===================================================================
--- testsuite/g++.dg/cpp0x/alignas8.C   (revision 0)
+++ testsuite/g++.dg/cpp0x/alignas8.C   (working copy)
@@ -0,0 +1,7 @@
+// PR c++/79380
+// { dg-do compile { target c++11 } }
+
+template < typename > constexpr int f () {  return 8;  }
+
+// should have been: struct alignas (f<int>()) S {};
+struct alignas (f) S {};  // { dg-error "17:'alignas' argument has 
non-integral type" }