Fix tests that fail in C++2a mode

The nested typedefs in std::reference_wrapper are no longer present in
C++2a mode, so skip the tests that check for them.

The addition of the [[nodiscard]] attribute to a few functions causes
some failures in tests that intentionally ignore the return value.
Casting the result to void suppresses the new warnings.

	* testsuite/20_util/reference_wrapper/result_type.cc: Disable for
	C++2a.
	* testsuite/20_util/reference_wrapper/typedefs-2.cc: Likewise.
	* testsuite/20_util/reference_wrapper/typedefs-3.cc: Likewise.
	* testsuite/20_util/reference_wrapper/typedefs.cc: Likewise.
	* testsuite/30_threads/async/54297.cc: Suppress nodiscard warning.
	* testsuite/ext/array_allocator/26875.cc: Likewise.
	* testsuite/ext/pool_allocator/allocate_chunk.cc: Likewise.
	* testsuite/util/replacement_memory_operators.h: Likewise.
	* testsuite/util/testsuite_allocator.h: Likewise.

From-SVN: r268355

10 files changed, 22 insertions, 7 deletions

diff --git a/libstdc++-v3/ChangeLog b/libstdc++-v3/ChangeLog
index 3003852..fc6f7d1 100644
--- a/libstdc++-v3/ChangeLog
+++ b/libstdc++-v3/ChangeLog
@@ -1,5 +1,16 @@
 2019-01-29  Jonathan Wakely  <jwakely@redhat.com>
 
+	* testsuite/20_util/reference_wrapper/result_type.cc: Disable for
+	C++2a.
+	* testsuite/20_util/reference_wrapper/typedefs-2.cc: Likewise.
+	* testsuite/20_util/reference_wrapper/typedefs-3.cc: Likewise.
+	* testsuite/20_util/reference_wrapper/typedefs.cc: Likewise.
+	* testsuite/30_threads/async/54297.cc: Suppress nodiscard warning.
+	* testsuite/ext/array_allocator/26875.cc: Likewise.
+	* testsuite/ext/pool_allocator/allocate_chunk.cc: Likewise.
+	* testsuite/util/replacement_memory_operators.h: Likewise.
+	* testsuite/util/testsuite_allocator.h: Likewise.
+
 	* include/std/memory_resource (__pool_resource::_M_unpooled): Use
 	normal mode vector, even for debug mode.
 	* include/std/vector [_GLIBCXX_DEBUG] (_GLIBCXX_STD_C::pmr::vector):
diff --git a/libstdc++-v3/testsuite/20_util/reference_wrapper/result_type.cc b/libstdc++-v3/testsuite/20_util/reference_wrapper/result_type.cc
index 81b4986..7c67283 100644
--- a/libstdc++-v3/testsuite/20_util/reference_wrapper/result_type.cc
+++ b/libstdc++-v3/testsuite/20_util/reference_wrapper/result_type.cc
@@ -1,4 +1,5 @@
 // { dg-do compile { target c++11 } }
+// { dg-skip-if "result_type removed for C++20" { c++2a } }
 
 // 2010-10-06  Paolo Carlini  <paolo.carlini@oracle.com>
 
diff --git a/libstdc++-v3/testsuite/20_util/reference_wrapper/typedefs-2.cc b/libstdc++-v3/testsuite/20_util/reference_wrapper/typedefs-2.cc
index 5db372c..e1aebd1 100644
--- a/libstdc++-v3/testsuite/20_util/reference_wrapper/typedefs-2.cc
+++ b/libstdc++-v3/testsuite/20_util/reference_wrapper/typedefs-2.cc
@@ -1,4 +1,5 @@
 // { dg-do compile { target c++11 } }
+// { dg-skip-if "argument_type removed for C++20" { c++2a } }
 
 // 2010-10-06  Paolo Carlini  <paolo.carlini@oracle.com>
 
diff --git a/libstdc++-v3/testsuite/20_util/reference_wrapper/typedefs-3.cc b/libstdc++-v3/testsuite/20_util/reference_wrapper/typedefs-3.cc
index 190fe91..5ca596a 100644
--- a/libstdc++-v3/testsuite/20_util/reference_wrapper/typedefs-3.cc
+++ b/libstdc++-v3/testsuite/20_util/reference_wrapper/typedefs-3.cc
@@ -1,4 +1,5 @@
 // { dg-do compile { target c++11 } }
+// { dg-skip-if "argument_type removed for C++20" { c++2a } }
 
 // Copyright (C) 2011-2019 Free Software Foundation, Inc.
 //
diff --git a/libstdc++-v3/testsuite/20_util/reference_wrapper/typedefs.cc b/libstdc++-v3/testsuite/20_util/reference_wrapper/typedefs.cc
index a17c1ed..1f4c77e 100644
--- a/libstdc++-v3/testsuite/20_util/reference_wrapper/typedefs.cc
+++ b/libstdc++-v3/testsuite/20_util/reference_wrapper/typedefs.cc
@@ -1,4 +1,5 @@
 // { dg-do compile { target c++11 } }
+// { dg-skip-if "result_type removed for C++20" { c++2a } }
 
 // Copyright (C) 2008-2019 Free Software Foundation, Inc.
 //
diff --git a/libstdc++-v3/testsuite/30_threads/async/54297.cc b/libstdc++-v3/testsuite/30_threads/async/54297.cc
index 4a2d8fc..654ce40 100644
--- a/libstdc++-v3/testsuite/30_threads/async/54297.cc
+++ b/libstdc++-v3/testsuite/30_threads/async/54297.cc
@@ -45,5 +45,5 @@ struct Task
 
 int main()
 {
-  std::async(std::launch::async, Task());
+  (void) std::async(std::launch::async, Task());
 }
diff --git a/libstdc++-v3/testsuite/ext/array_allocator/26875.cc b/libstdc++-v3/testsuite/ext/array_allocator/26875.cc
index d4cbb04..e72e3b2 100644
--- a/libstdc++-v3/testsuite/ext/array_allocator/26875.cc
+++ b/libstdc++-v3/testsuite/ext/array_allocator/26875.cc
@@ -33,8 +33,8 @@ int main()
 
   try
     {
-      Allocator1.allocate(1);
-      Allocator2.allocate(1);
+      (void) Allocator1.allocate(1);
+      (void) Allocator2.allocate(1);
     }
   catch (std::bad_alloc& ex)
     {
diff --git a/libstdc++-v3/testsuite/ext/pool_allocator/allocate_chunk.cc b/libstdc++-v3/testsuite/ext/pool_allocator/allocate_chunk.cc
index 1c958d6..b90778c 100644
--- a/libstdc++-v3/testsuite/ext/pool_allocator/allocate_chunk.cc
+++ b/libstdc++-v3/testsuite/ext/pool_allocator/allocate_chunk.cc
@@ -48,13 +48,13 @@ void test01()
   using __gnu_cxx::__pool_alloc;
 
   __pool_alloc<big> alloc_big;
-  alloc_big.allocate(1);
+  (void) alloc_big.allocate(1);
 
   // The constant 20 comes from __pool_alloc_base::_M_refill. See
   // also __pool_alloc_base::_M_allocate_chunk.
   __pool_alloc<small> alloc_small;
   for (unsigned int i = 0; i < 20 * sizeof(big) / sizeof(small) + 1; ++i)
-    alloc_small.allocate(1);
+    (void) alloc_small.allocate(1);
 }
 
 int main()
diff --git a/libstdc++-v3/testsuite/util/replacement_memory_operators.h b/libstdc++-v3/testsuite/util/replacement_memory_operators.h
index 9befe27..fb0b2be 100644
--- a/libstdc++-v3/testsuite/util/replacement_memory_operators.h
+++ b/libstdc++-v3/testsuite/util/replacement_memory_operators.h
@@ -64,7 +64,7 @@ namespace __gnu_test
     check_new(Alloc a = Alloc())
     {
       __gnu_test::counter::exceptions(false);
-      a.allocate(10);
+      (void) a.allocate(10);
       const bool __b((__gnu_test::counter::count() > 0) == uses_global_new);
       if (!__b)
 	throw std::logic_error("counter not incremented");
diff --git a/libstdc++-v3/testsuite/util/testsuite_allocator.h b/libstdc++-v3/testsuite/util/testsuite_allocator.h
index 0e77ff4..044b9d5 100644
--- a/libstdc++-v3/testsuite/util/testsuite_allocator.h
+++ b/libstdc++-v3/testsuite/util/testsuite_allocator.h
@@ -245,7 +245,7 @@ namespace __gnu_test
       Alloc a;
       try
 	{
-	  a.allocate(a.max_size() + 1);
+	  (void) a.allocate(a.max_size() + 1);
 	}
       catch(std::bad_alloc&)
 	{