re PR c++/48531 ([C++0x][SFINAE] Hard errors with arrays of unknown bound)

PR c++/48531
	* typeck2.c (build_functional_cast): Disallow array type.

From-SVN: r172632

gcc/cp/ChangeLog

@@ -1,5 +1,8 @@
 2011-04-17  Jason Merrill  <jason@redhat.com>
 
+	PR c++/48531
+	* typeck2.c (build_functional_cast): Disallow array type.
+
 	* tree.c (get_target_expr): Handle VEC_INIT_EXPR.
 
 2011-04-17  Jan Hubicka  <jh@suse.cz>

gcc/cp/init.c

@@ -369,6 +369,8 @@ build_value_init (tree type, tsubst_flags_t complain)
 tree
 build_value_init_noctor (tree type, tsubst_flags_t complain)
 {
+  /* FIXME the class and array cases should just use digest_init once it is
+     SFINAE-enabled.  */
   if (CLASS_TYPE_P (type))
     {
       gcc_assert (!TYPE_NEEDS_CONSTRUCTING (type));
@@ -450,7 +452,9 @@ build_value_init_noctor (tree type, tsubst_flags_t complain)
 	  if (ce->value == error_mark_node)
 	    return error_mark_node;
 
-	  /* The gimplifier can't deal with a RANGE_EXPR of TARGET_EXPRs.  */
+	  /* We shouldn't have gotten here for anything that would need
+	     non-trivial initialization, and gimplify_init_ctor_preeval
+	     would need to be fixed to allow it.  */
 	  gcc_assert (TREE_CODE (ce->value) != TARGET_EXPR
 		      && TREE_CODE (ce->value) != AGGR_INIT_EXPR);
 	}

gcc/cp/typeck2.c

@@ -1534,6 +1534,15 @@ build_functional_cast (tree exp, tree parms, tsubst_flags_t complain)
   else
     type = exp;
 
+  /* We need to check this explicitly, since value-initialization of
+     arrays is allowed in other situations.  */
+  if (TREE_CODE (type) == ARRAY_TYPE)
+    {
+      if (complain & tf_error)
+	error ("functional cast to array type %qT", type);
+      return error_mark_node;
+    }
+
   if (processing_template_decl)
     {
       tree t;

gcc/testsuite/ChangeLog

@@ -1,3 +1,7 @@
+2011-04-17  Jason Merrill  <jason@redhat.com>
+
+	* g++.dg/cpp0x/sfinae16.C: New.
+
 2011-04-17  Richard Sandiford  <rdsandiford@googlemail.com>
 
 	* gcc.target/mips/reg-var-1.c: New test.

gcc/testsuite/g++.dg/cpp0x/sfinae16.C

@@ -0,0 +1,17 @@
+// PR c++/48531
+// { dg-options -std=c++0x }
+
+template<class T,
+  class = decltype(T())
+>
+char f(int);
+
+template<class>
+double f(...);
+
+struct B2 {
+  B2(...);
+};
+
+#define SA(X) static_assert ((X), #X);
+SA(sizeof(f<B2[2]>(0)) != 1);