re PR c++/48281 ([C++0x] internal compiler error: in record_reference, at cgraphbuild.c:60)

	PR c++/48281
	* semantics.c (finish_compound_literal): Do put static/constant
	arrays in static variables.

From-SVN: r171741

gcc/cp/ChangeLog

 2011-03-30  Jason Merrill  <jason@redhat.com>
 
+	PR c++/48281
+	* semantics.c (finish_compound_literal): Do put static/constant
+	arrays in static variables.
+
 	* call.c (convert_like_real) [ck_list]: Build up the
 	initializer_list object directly.
 	* decl.c (build_init_list_var_init): Adjust.

gcc/cp/semantics.c

@@ -2335,7 +2335,34 @@ finish_compound_literal (tree type, tree compound_literal)
   if (TREE_CODE (type) == ARRAY_TYPE)
     cp_complete_array_type (&type, compound_literal, false);
   compound_literal = digest_init (type, compound_literal);
-  return get_target_expr (compound_literal);
+  /* Put static/constant array temporaries in static variables, but always
+     represent class temporaries with TARGET_EXPR so we elide copies.  */
+  if ((!at_function_scope_p () || CP_TYPE_CONST_P (type))
+      && TREE_CODE (type) == ARRAY_TYPE
+      && initializer_constant_valid_p (compound_literal, type))
+    {
+      tree decl = create_temporary_var (type);
+      DECL_INITIAL (decl) = compound_literal;
+      TREE_STATIC (decl) = 1;
+      if (literal_type_p (type) && CP_TYPE_CONST_NON_VOLATILE_P (type))
+	{
+	  /* 5.19 says that a constant expression can include an
+	     lvalue-rvalue conversion applied to "a glvalue of literal type
+	     that refers to a non-volatile temporary object initialized
+	     with a constant expression".  Rather than try to communicate
+	     that this VAR_DECL is a temporary, just mark it constexpr.  */
+	  DECL_DECLARED_CONSTEXPR_P (decl) = true;
+	  DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = true;
+	  TREE_CONSTANT (decl) = true;
+	}
+      cp_apply_type_quals_to_decl (cp_type_quals (type), decl);
+      decl = pushdecl_top_level (decl);
+      DECL_NAME (decl) = make_anon_name ();
+      SET_DECL_ASSEMBLER_NAME (decl, DECL_NAME (decl));
+      return decl;
+    }
+  else
+    return get_target_expr (compound_literal);
 }
 
 /* Return the declaration for the function-name variable indicated by

gcc/testsuite/ChangeLog

+2011-03-30  Jason Merrill  <jason@redhat.com>
+
+	* g++.dg/cpp0x/initlist46.C: New.
+
 2011-03-30  Richard Sandiford  <richard.sandiford@linaro.org>
 
 	PR target/47551

gcc/testsuite/g++.dg/cpp0x/initlist46.C

+// PR c++/48281
+// { dg-options "-std=c++0x -O2" }
+// { dg-do run }
+
+#include <initializer_list>
+
+typedef std::initializer_list<int>  int1;
+typedef std::initializer_list<int1> int2;
+static int2 ib = {{42,2,3,4,5},{2,3,4,5,1},{3,4,5,2,1}};
+
+int main()
+{
+  return *(ib.begin()->begin()) != 42;
+}