[gcc r12-11046] libstdc++: Add dg-options "-std=gnu++20" to backported tests

[Jonathan Wakely]

https://gcc.gnu.org/g:cab0305aea0ca591b032adf09e97acd5e34c9f10

commit r12-11046-gcab0305aea0ca591b032adf09e97acd5e34c9f10
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Wed Apr 16 18:38:03 2025 +0100

    libstdc++: Add dg-options "-std=gnu++20" to backported tests
    
    These tests were backported from gcc-14 where the testsuite
    automatically adds -std=gnu++20 as needed. That doesn't happen on the
    older release branches, so an explicit dg-options directive is needed to
    ensure the tests are run by default. Otherwise they'll only be run when
    somebody uses a custom --target_board that includes -std=gnu++20.
    
    For 29_atomics/headers/stdatomic.h/115807.cc we need to compile with
    -std=gnu++23 instead.
    
    libstdc++-v3/ChangeLog:
    
            * testsuite/20_util/integer_sequence/112473.cc: Compile with
            -std=gnu++20.
            * testsuite/21_strings/char_traits/requirements/113200.cc:
            Likewise.
            * testsuite/23_containers/array/comparison_operators/106212.cc:
            Likewise.
            * testsuite/23_containers/span/117966.cc: Likewise.
            * testsuite/23_containers/vector/cons/113841.cc: Compile with
            -std=gnu++20.
            * testsuite/24_iterators/move_iterator/lwg3736.cc: Likewise.
            * testsuite/25_algorithms/lexicographical_compare_three_way/113960.cc:
            Likewise.
            * testsuite/27_io/filesystem/iterators/lwg3480.cc: Likewise.
            * testsuite/29_atomics/headers/stdatomic.h/115807.cc: Compile
            with -std=gnu++23.
            * testsuite/std/ranges/subrange/lwg3589.cc: Likewise.
            * testsuite/std/time/month/2.cc: Likewise.
            * testsuite/std/time/weekday/2.cc: Likewise.
    
    (cherry picked from commit 4182fa87758d5a94c1f6d71f471842207e56f933)

Diff:
---
 libstdc++-v3/testsuite/20_util/integer_sequence/112473.cc               | 1 +
 libstdc++-v3/testsuite/21_strings/char_traits/requirements/113200.cc    | 1 +
 .../testsuite/23_containers/array/comparison_operators/106212.cc        | 2 +-
 libstdc++-v3/testsuite/23_containers/span/117966.cc                     | 2 +-
 libstdc++-v3/testsuite/23_containers/vector/cons/113841.cc              | 1 +
 libstdc++-v3/testsuite/24_iterators/move_iterator/lwg3736.cc            | 1 +
 .../testsuite/25_algorithms/lexicographical_compare_three_way/113960.cc | 1 +
 libstdc++-v3/testsuite/27_io/filesystem/iterators/lwg3480.cc            | 1 +
 libstdc++-v3/testsuite/29_atomics/headers/stdatomic.h/115807.cc         | 1 +
 libstdc++-v3/testsuite/std/ranges/subrange/lwg3589.cc                   | 1 +
 libstdc++-v3/testsuite/std/time/month/2.cc                              | 1 +
 libstdc++-v3/testsuite/std/time/weekday/2.cc                            | 1 +
 12 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/libstdc++-v3/testsuite/20_util/integer_sequence/112473.cc b/libstdc++-v3/testsuite/20_util/integer_sequence/112473.cc
index 14abfbc8149d..1c8035c6b1e5 100644
--- a/libstdc++-v3/testsuite/20_util/integer_sequence/112473.cc
+++ b/libstdc++-v3/testsuite/20_util/integer_sequence/112473.cc
@@ -1,3 +1,4 @@
+// { dg-options "-std=gnu++20" }
 // { dg-do compile { target c++20 } }
 
 // PR libstdc++/112473 - integer_sequence accepts non-integer types
diff --git a/libstdc++-v3/testsuite/21_strings/char_traits/requirements/113200.cc b/libstdc++-v3/testsuite/21_strings/char_traits/requirements/113200.cc
index 0fe765d53bcc..6a1b03293efb 100644
--- a/libstdc++-v3/testsuite/21_strings/char_traits/requirements/113200.cc
+++ b/libstdc++-v3/testsuite/21_strings/char_traits/requirements/113200.cc
@@ -1,3 +1,4 @@
+// { dg-options "-std=gnu++20" }
 // { dg-do compile { target c++20 } }
 
 // PR libstdc++/113200
diff --git a/libstdc++-v3/testsuite/23_containers/array/comparison_operators/106212.cc b/libstdc++-v3/testsuite/23_containers/array/comparison_operators/106212.cc
index f7b12bd04efd..d6d9bf464b2f 100644
--- a/libstdc++-v3/testsuite/23_containers/array/comparison_operators/106212.cc
+++ b/libstdc++-v3/testsuite/23_containers/array/comparison_operators/106212.cc
@@ -1,4 +1,4 @@
-// { dg-options "-D_GLIBCXX_DEBUG" }
+// { dg-options "-D_GLIBCXX_DEBUG -std=gnu++20" }
 // { dg-do compile { target c++20 } }
 
 // Bug libstdc++/106212 - Code becomes non-constexpr with _GLIBCXX_DEBUG
diff --git a/libstdc++-v3/testsuite/23_containers/span/117966.cc b/libstdc++-v3/testsuite/23_containers/span/117966.cc
index 8bbb5ca1e079..cf30fcadd8f9 100644
--- a/libstdc++-v3/testsuite/23_containers/span/117966.cc
+++ b/libstdc++-v3/testsuite/23_containers/span/117966.cc
@@ -1,4 +1,4 @@
-// { dg-options "-D_GLIBCXX_DEBUG" }
+// { dg-options "-D_GLIBCXX_DEBUG -std=gnu++20" }
 // { dg-do compile { target c++20 } }
 
 // Bug 117966
diff --git a/libstdc++-v3/testsuite/23_containers/vector/cons/113841.cc b/libstdc++-v3/testsuite/23_containers/vector/cons/113841.cc
index a7721d27f796..9c9c7d2d1c42 100644
--- a/libstdc++-v3/testsuite/23_containers/vector/cons/113841.cc
+++ b/libstdc++-v3/testsuite/23_containers/vector/cons/113841.cc
@@ -1,3 +1,4 @@
+// { dg-options "-std=gnu++20" }
 // { dg-do compile { target c++20 } }
 
 #include <vector>
diff --git a/libstdc++-v3/testsuite/24_iterators/move_iterator/lwg3736.cc b/libstdc++-v3/testsuite/24_iterators/move_iterator/lwg3736.cc
index eaf791b30893..49fb686aa06d 100644
--- a/libstdc++-v3/testsuite/24_iterators/move_iterator/lwg3736.cc
+++ b/libstdc++-v3/testsuite/24_iterators/move_iterator/lwg3736.cc
@@ -1,3 +1,4 @@
+// { dg-options "-std=gnu++20" }
 // { dg-do compile { target c++20 } }
 
 // 3736.  move_iterator missing disable_sized_sentinel_for specialization
diff --git a/libstdc++-v3/testsuite/25_algorithms/lexicographical_compare_three_way/113960.cc b/libstdc++-v3/testsuite/25_algorithms/lexicographical_compare_three_way/113960.cc
index d51ae1a3d50d..388a535b9040 100644
--- a/libstdc++-v3/testsuite/25_algorithms/lexicographical_compare_three_way/113960.cc
+++ b/libstdc++-v3/testsuite/25_algorithms/lexicographical_compare_three_way/113960.cc
@@ -1,3 +1,4 @@
+// { dg-options "-std=gnu++20" }
 // { dg-do run { target c++20 } }
 
 // PR libstdc++/113960
diff --git a/libstdc++-v3/testsuite/27_io/filesystem/iterators/lwg3480.cc b/libstdc++-v3/testsuite/27_io/filesystem/iterators/lwg3480.cc
index 15e0286fff6f..98e97a7775f3 100644
--- a/libstdc++-v3/testsuite/27_io/filesystem/iterators/lwg3480.cc
+++ b/libstdc++-v3/testsuite/27_io/filesystem/iterators/lwg3480.cc
@@ -1,3 +1,4 @@
+// { dg-options "-std=gnu++20" }
 // { dg-do compile { target c++20 } }
 // { dg-require-filesystem-ts "" }
 
diff --git a/libstdc++-v3/testsuite/29_atomics/headers/stdatomic.h/115807.cc b/libstdc++-v3/testsuite/29_atomics/headers/stdatomic.h/115807.cc
index 14f320fe8357..7f9d742838df 100644
--- a/libstdc++-v3/testsuite/29_atomics/headers/stdatomic.h/115807.cc
+++ b/libstdc++-v3/testsuite/29_atomics/headers/stdatomic.h/115807.cc
@@ -1,3 +1,4 @@
+// { dg-options "-std=gnu++23" }
 // { dg-do compile { target c++23 } }
 #include <stdatomic.h>
 namespace other {
diff --git a/libstdc++-v3/testsuite/std/ranges/subrange/lwg3589.cc b/libstdc++-v3/testsuite/std/ranges/subrange/lwg3589.cc
index 1ccc52d81f8a..4447b3186ebd 100644
--- a/libstdc++-v3/testsuite/std/ranges/subrange/lwg3589.cc
+++ b/libstdc++-v3/testsuite/std/ranges/subrange/lwg3589.cc
@@ -1,3 +1,4 @@
+// { dg-options "-std=gnu++20" }
 // { dg-do compile { target c++20 } }
 
 // LWG 3589. The const lvalue reference overload of get for subrange does not
diff --git a/libstdc++-v3/testsuite/std/time/month/2.cc b/libstdc++-v3/testsuite/std/time/month/2.cc
index 3bcefa60003b..4ef0adfbce38 100644
--- a/libstdc++-v3/testsuite/std/time/month/2.cc
+++ b/libstdc++-v3/testsuite/std/time/month/2.cc
@@ -1,3 +1,4 @@
+// { dg-options "-std=gnu++20" }
 // { dg-do run { target c++20 } }
 
 // Class month [time.cal.month]
diff --git a/libstdc++-v3/testsuite/std/time/weekday/2.cc b/libstdc++-v3/testsuite/std/time/weekday/2.cc
index 924709321e5d..6980f78fbe1f 100644
--- a/libstdc++-v3/testsuite/std/time/weekday/2.cc
+++ b/libstdc++-v3/testsuite/std/time/weekday/2.cc
@@ -1,3 +1,4 @@
+// { dg-options "-std=gnu++20" }
 // { dg-do run { target c++20 } }
 
 // Class weekday [time.cal.wd]