[committed] libstdc++: Fix test FAILs due to -Wreturn-local-addr

[Jonathan Wakely]

Tested x86_64-linux. Pushed to trunk.

-- >8 --

This fixes two FAILs due to -Wpointer-arith warnings when testing with
c++11 or c++14 dialects.

libstdc++-v3/ChangeLog:

        * testsuite/20_util/bind/dangling_ref.cc: Add an additional
        dg-warning for -Wreturn-local-addr warning.
        * testsuite/30_threads/packaged_task/cons/dangling_ref.cc:
        Likewise.
---
 libstdc++-v3/testsuite/20_util/bind/dangling_ref.cc              | 1 +
 .../testsuite/30_threads/packaged_task/cons/dangling_ref.cc      | 1 +
 2 files changed, 2 insertions(+)

diff --git a/libstdc++-v3/testsuite/20_util/bind/dangling_ref.cc 
b/libstdc++-v3/testsuite/20_util/bind/dangling_ref.cc
index 70393e4392f..17e7b21c45c 100644
--- a/libstdc++-v3/testsuite/20_util/bind/dangling_ref.cc
+++ b/libstdc++-v3/testsuite/20_util/bind/dangling_ref.cc
@@ -5,5 +5,6 @@ int f();
 auto b = std::bind<const int&>(f);
 int i = b(); // { dg-error "here" "" { target { c++14_down } } }
 // { dg-error "dangling reference" "" { target { c++14_down } } 0 }
+// { dg-error "reference to temporary" "" { target { c++14_down } } 0 }
 // { dg-error "no matching function" "" { target c++17 } 0 }
 // { dg-error "enable_if" "" { target c++17 } 0 }
diff --git 
a/libstdc++-v3/testsuite/30_threads/packaged_task/cons/dangling_ref.cc 
b/libstdc++-v3/testsuite/30_threads/packaged_task/cons/dangling_ref.cc
index e9edb5edc8b..225b65fe6a7 100644
--- a/libstdc++-v3/testsuite/30_threads/packaged_task/cons/dangling_ref.cc
+++ b/libstdc++-v3/testsuite/30_threads/packaged_task/cons/dangling_ref.cc
@@ -7,5 +7,6 @@
 int f();
 std::packaged_task<const int&()> task(f);
 // { dg-error "dangling reference" "" { target { c++14_down } } 0 }
+// { dg-error "reference to temporary" "" { target { c++14_down } } 0 }
 // { dg-error "no matching function" "" { target c++17 } 0 }
 // { dg-error "enable_if" "" { target c++17 } 0 }
-- 
2.46.1