[gcc r15-3932] libstdc++: Fix test FAILs due to -Wreturn-local-addr

[Jonathan Wakely]

https://gcc.gnu.org/g:c580b8a2b59208efc687e2b706e3a40225167854

commit r15-3932-gc580b8a2b59208efc687e2b706e3a40225167854
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Thu Sep 26 23:43:20 2024 +0100

    libstdc++: Fix test FAILs due to -Wreturn-local-addr
    
    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.

Diff:
---
 libstdc++-v3/testsuite/20_util/bind/dangling_ref.cc                  | 1 +
 libstdc++-v3/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 70393e4392f8..17e7b21c45cb 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 e9edb5edc8be..225b65fe6a7d 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 }