[committed] libstdc++: Add -Wno-deprecated for tests that warn in C++20

[Jonathan Wakely via Gcc-patches]

libstdc++-v3/ChangeLog:

        * testsuite/20_util/tuple/78939.cc: Suppress warnings about
        deprecation of volatile-qualified structured bindings in C++20.
        * testsuite/20_util/variable_templates_for_traits.cc: Likewise
        for deprecation of is_pod in C++20

Tested x86_64-linux, committed to trunk.



commit 95edead9aab7a70636f87ea041f05469dc41d9a9
Author: Jonathan Wakely <jwak...@redhat.com>
Date:   Fri Jul 31 17:51:00 2020

    libstdc++: Add -Wno-deprecated for tests that warn in C++20
    
    libstdc++-v3/ChangeLog:
    
            * testsuite/20_util/tuple/78939.cc: Suppress warnings about
            deprecation of volatile-qualified structured bindings in C++20.
            * testsuite/20_util/variable_templates_for_traits.cc: Likewise
            for deprecation of is_pod in C++20

diff --git a/libstdc++-v3/testsuite/20_util/tuple/78939.cc 
b/libstdc++-v3/testsuite/20_util/tuple/78939.cc
index d238f75bb8a..b2ff324b232 100644
--- a/libstdc++-v3/testsuite/20_util/tuple/78939.cc
+++ b/libstdc++-v3/testsuite/20_util/tuple/78939.cc
@@ -16,6 +16,7 @@
 // <http://www.gnu.org/licenses/>.
 
 // { dg-options "-std=gnu++17" }
+// { dg-additional-options "-Wno-deprecated" { target c++2a } }
 // { dg-do compile { target c++17 } }
 
 // PR libstdc++/78939
@@ -36,7 +37,7 @@ int
 test02()
 {
   A a{};
-  volatile auto [i, j] = a;
+  volatile auto [i, j] = a; // deprecated in C++20
   return i + j;
 }
 
@@ -44,6 +45,6 @@ int
 test03()
 {
   A a{};
-  const volatile auto [i, j] = a;
+  const volatile auto [i, j] = a; // deprecated in C++20
   return i + j;
 }
diff --git a/libstdc++-v3/testsuite/20_util/variable_templates_for_traits.cc 
b/libstdc++-v3/testsuite/20_util/variable_templates_for_traits.cc
index 0f1625a8cb6..9c1f82b5c86 100644
--- a/libstdc++-v3/testsuite/20_util/variable_templates_for_traits.cc
+++ b/libstdc++-v3/testsuite/20_util/variable_templates_for_traits.cc
@@ -1,5 +1,6 @@
 // { dg-options "-std=gnu++17" }
-// { dg-do compile }
+// { dg-additional-options "-Wno-deprecated" { target c++2a } }
+// { dg-do compile { target c++17 } }
 
 // Copyright (C) 2014-2020 Free Software Foundation, Inc.
 //
@@ -142,6 +143,7 @@ static_assert(is_standard_layout_v<int>
 static_assert(!is_standard_layout_v<NType>
              && !is_standard_layout<NType>::value, "");
 
+// Deprecated in C++20
 static_assert(is_pod_v<int>
              && is_pod<int>::value, "");
 static_assert(!is_pod_v<NType>