[v3] Fix libstdc++/56019

[v3] Fix libstdc++/56019

[Paolo Carlini]

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Hi,

tested x86_64-linux, committed to mainline.

Thanks,
Paolo.

////////////////////////

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2013-06-11  Paolo Carlini  <paolo.carlini@oracle.com>

	PR libstdc++/56019
	* include/c_global/cstddef (max_align_t): Add to namespace std.
	* include/c_std/cstddef: Likewise.
	* testsuite/18_support/max_align_t/requirements/1.cc: New.
	* testsuite/18_support/max_align_t/requirements/2.cc: Likewise.

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Index: include/c_global/cstddef
===================================================================
--- include/c_global/cstddef	(revision 199937)
+++ include/c_global/cstddef	(working copy)
@@ -36,7 +36,20 @@
 // ISO C++ 14882: 18.1  Types
 //
 
+#ifndef _GLIBCXX_CSTDDEF
+#define _GLIBCXX_CSTDDEF 1
+
 #pragma GCC system_header
 
 #include <bits/c++config.h>
 #include <stddef.h>
+
+#if __cplusplus >= 201103L
+namespace std
+{
+  // We handle size_t, ptrdiff_t, and nullptr_t in c++config.h.
+  using ::max_align_t;
+}
+#endif
+
+#endif // _GLIBCXX_CSTDDEF
Index: include/c_std/cstddef
===================================================================
--- include/c_std/cstddef	(revision 199937)
+++ include/c_std/cstddef	(working copy)
@@ -44,4 +44,12 @@
 #include <bits/c++config.h>
 #include <stddef.h>
 
+#if __cplusplus >= 201103L
+namespace std
+{
+  // We handle size_t, ptrdiff_t, and nullptr_t in c++config.h.
+  using ::max_align_t;
+}
 #endif
+
+#endif // _GLIBCXX_CSTDDEF
Index: testsuite/18_support/max_align_t/requirements/1.cc
===================================================================
--- testsuite/18_support/max_align_t/requirements/1.cc	(revision 0)
+++ testsuite/18_support/max_align_t/requirements/1.cc	(working copy)
@@ -0,0 +1,23 @@
+// { dg-do compile }
+// { dg-options "-std=gnu++11" }
+//
+// Copyright (C) 2013 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+#include <cstddef>
+
+std::max_align_t t;
Index: testsuite/18_support/max_align_t/requirements/2.cc
===================================================================
--- testsuite/18_support/max_align_t/requirements/2.cc	(revision 0)
+++ testsuite/18_support/max_align_t/requirements/2.cc	(working copy)
@@ -0,0 +1,24 @@
+// { dg-do compile }
+// { dg-options "-std=gnu++11" }
+//
+// Copyright (C) 2013 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+#include <cstddef>
+#include <type_traits>
+
+static_assert (std::is_pod<std::max_align_t>::value, "");