[committed] libstdc++: Disable std::forward_list tests for C++98 mode

[Jonathan Wakely via Gcc-patches]

Tested x86_64-linux. Pushed to trunk.

-- >8 --

These tests fail with -std=gnu++98/-D_GLIBCXX_DEBUG in the runtest
flags. They should require the c++11 effective target.

libstdc++-v3/ChangeLog:

        * testsuite/23_containers/forward_list/debug/iterator1_neg.cc:
        Skip as UNSUPPORTED for C++98 mode.
        * testsuite/23_containers/forward_list/debug/iterator3_neg.cc:
        Likewise.
---
 .../testsuite/23_containers/forward_list/debug/iterator1_neg.cc | 2 +-
 .../testsuite/23_containers/forward_list/debug/iterator3_neg.cc | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git 
a/libstdc++-v3/testsuite/23_containers/forward_list/debug/iterator1_neg.cc 
b/libstdc++-v3/testsuite/23_containers/forward_list/debug/iterator1_neg.cc
index a0e05413896..59a22f7ec89 100644
--- a/libstdc++-v3/testsuite/23_containers/forward_list/debug/iterator1_neg.cc
+++ b/libstdc++-v3/testsuite/23_containers/forward_list/debug/iterator1_neg.cc
@@ -15,7 +15,7 @@
 // with this library; see the file COPYING3.  If not see
 // <http://www.gnu.org/licenses/>.
 //
-// { dg-do run { xfail *-*-* } }
+// { dg-do run { target c++11 xfail *-*-* } }
 // { dg-require-debug-mode "" }
 
 #include <forward_list>
diff --git 
a/libstdc++-v3/testsuite/23_containers/forward_list/debug/iterator3_neg.cc 
b/libstdc++-v3/testsuite/23_containers/forward_list/debug/iterator3_neg.cc
index bfa281ad9f4..0c4439f46ed 100644
--- a/libstdc++-v3/testsuite/23_containers/forward_list/debug/iterator3_neg.cc
+++ b/libstdc++-v3/testsuite/23_containers/forward_list/debug/iterator3_neg.cc
@@ -15,7 +15,7 @@
 // with this library; see the file COPYING3.  If not see
 // <http://www.gnu.org/licenses/>.
 //
-// { dg-do run { xfail *-*-* } }
+// { dg-do run { target c++11 xfail *-*-* } }
 // { dg-require-debug-mode "" }
 
 #include <forward_list>
-- 
2.41.0