PR71856 try to fix Parallel Mode assertions again

PR libstdc++/71856
	* doc/xml/manual/using.xml: Document macro.
	* include/bits/c++config [_GLIBCXX_DEBUG || _GLIBCXX_PARALLEL]
	(__glibcxx_assert): Rename to __glibcxx_assert_impl.
	[_GLIBCXX_DEBUG] (__glibcxx_assert): Expand to __glibcxx_assert_impl.
	* include/parallel/base.h [_GLIBCXX_PARALLEL_ASSERTIONS]
	(_GLIBCXX_PARALLEL_ASSERT): Expand to __glibcxx_assert_impl.
	[!_GLIBCXX_PARALLEL_ASSERTIONS] (_GLIBCXX_PARALLEL_ASSERT): Define as
	empty.
	* testsuite/25_algorithms/headers/algorithm/
	parallel_algorithm_assert2.cc: New test.

From-SVN: r243434

libstdc++-v3/ChangeLog

@@ -1,3 +1,17 @@
+2016-12-08  Jonathan Wakely  <jwakely@redhat.com>
+
+	PR libstdc++/71856
+	* doc/xml/manual/using.xml: Document macro.
+	* include/bits/c++config [_GLIBCXX_DEBUG || _GLIBCXX_PARALLEL]
+	(__glibcxx_assert): Rename to __glibcxx_assert_impl.
+	[_GLIBCXX_DEBUG] (__glibcxx_assert): Expand to __glibcxx_assert_impl.
+	* include/parallel/base.h [_GLIBCXX_PARALLEL_ASSERTIONS]
+	(_GLIBCXX_PARALLEL_ASSERT): Expand to __glibcxx_assert_impl.
+	[!_GLIBCXX_PARALLEL_ASSERTIONS] (_GLIBCXX_PARALLEL_ASSERT): Define as
+	empty.
+	* testsuite/25_algorithms/headers/algorithm/
+	parallel_algorithm_assert2.cc: New test.
+
 2016-12-08  Jakub Jelinek  <jakub@redhat.com>
 
 	* testsuite/util/testsuite_new_operators.h: Include testsuite_hooks.h.

libstdc++-v3/doc/xml/manual/using.xml

@@ -948,6 +948,15 @@ g++ -Winvalid-pch -I. -include stdc++.h -H -g -O2 hello.cc -o test.exe
 	mode</link>.
       </para>
     </listitem></varlistentry>
+    <varlistentry><term><code>_GLIBCXX_PARALLEL_ASSERTIONS</code></term>
+    <listitem>
+      <para>Undefined by default, but when any parallel mode header is included
+      this macro will be defined to a non-zero value if
+      <code>_GLIBCXX_ASSERTIONS</code> has a non-zero value, otherwise to zero.
+      When defined to a non-zero value, it enables extra error checking and
+      assertions in the parallel mode.
+      </para>
+    </listitem></varlistentry>
 
     <varlistentry><term><code>_GLIBCXX_PROFILE</code></term>
     <listitem>

libstdc++-v3/include/bits/c++config

@@ -434,9 +434,8 @@ namespace std
 #endif
 
 // Assert.
-#if !defined(_GLIBCXX_ASSERTIONS) && !defined(_GLIBCXX_PARALLEL)
+#if defined(_GLIBCXX_ASSERTIONS) \
-# define __glibcxx_assert(_Condition)
+  || defined(_GLIBCXX_PARALLEL) || defined(_GLIBCXX_PARALLEL_ASSERTIONS)
-#else
 namespace std
 {
   // Avoid the use of assert, because we're trying to keep the <cassert>
@@ -450,7 +449,7 @@ namespace std
     __builtin_abort();
   }
 }
-#define __glibcxx_assert(_Condition)				   	 \
+#define __glibcxx_assert_impl(_Condition)				 \
   do 									 \
   {							      		 \
     if (! (_Condition))                                                  \
@@ -459,6 +458,12 @@ namespace std
   } while (false)
 #endif
 
+#if defined(_GLIBCXX_ASSERTIONS)
+# define __glibcxx_assert(_Condition) __glibcxx_assert_impl(_Condition)
+#else
+# define __glibcxx_assert(_Condition)
+#endif
+
 // Macros for race detectors.
 // _GLIBCXX_SYNCHRONIZATION_HAPPENS_BEFORE(A) and
 // _GLIBCXX_SYNCHRONIZATION_HAPPENS_AFTER(A) should be used to explain

libstdc++-v3/include/parallel/base.h

@@ -419,7 +419,11 @@ namespace __gnu_parallel
 	}
     }
 
-#define _GLIBCXX_PARALLEL_ASSERT(_Condition) __glibcxx_assert(_Condition)
+#if _GLIBCXX_PARALLEL_ASSERTIONS && defined(__glibcxx_assert_impl)
+#define _GLIBCXX_PARALLEL_ASSERT(_Condition) __glibcxx_assert_impl(_Condition)
+#else
+#define _GLIBCXX_PARALLEL_ASSERT(_Condition)
+#endif
 
 } //namespace __gnu_parallel
 

libstdc++-v3/testsuite/25_algorithms/headers/algorithm/parallel_algorithm_assert2.cc

@@ -0,0 +1,50 @@
+// { dg-require-parallel-mode "" }
+// { dg-options "-fopenmp -D_GLIBCXX_PARALLEL" { target *-*-* } }
+// { dg-do run }
+
+// Copyright (C) 2016 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/>.
+
+#undef _GLIBCXX_DEBUG
+#undef _GLIBCXX_ASSERTIONS
+#undef _GLIBCXX_PARALLEL_ASSERTIONS
+#define _GLIBCXX_PARALLEL_ASSERTIONS 1
+#include <parallel/algorithm>
+#include <testsuite_hooks.h>
+
+void
+test01()
+{
+  // This should not be enabled without _GLIBCXX_ASSERTIONS:
+  __glibcxx_assert(false);
+}
+
+void
+test02()
+{
+  bool result = false;
+
+  // This should be enabled by _GLIBCXX_PARALLEL_ASSERTIONS:
+  _GLIBCXX_PARALLEL_ASSERT(result = true);
+  VERIFY(result);
+}
+
+int main()
+{
+  test01();
+  test02();
+}