[PATCH 05/13] libstdc++: Remove dg-options "-std=c++20" from and tests

[Jonathan Wakely via Gcc-patches]

The testsuite will automatically select C++20 for these tests now, and
removing the hardcoded -std option allows them to be tested for C++23
and C++26 as well.

There doesn't seem to be any reason they need to use strict -std=c++20
mode, so don't add the { dg-add-options strict_std } directive, just let
them use strict or non-strict modes.

libstdc++-v3/ChangeLog:

        * testsuite/21_strings/headers/cuchar/functions_std_cxx20.cc:
        Remove dg-options.
        * testsuite/23_containers/span/contiguous_range_neg.cc:
        Likewise.
        * testsuite/23_containers/span/everything.cc: Likewise.
---
 .../testsuite/21_strings/headers/cuchar/functions_std_cxx20.cc | 1 -
 .../testsuite/23_containers/span/contiguous_range_neg.cc       | 3 +--
 libstdc++-v3/testsuite/23_containers/span/everything.cc        | 3 +--
 3 files changed, 2 insertions(+), 5 deletions(-)

diff --git 
a/libstdc++-v3/testsuite/21_strings/headers/cuchar/functions_std_cxx20.cc 
b/libstdc++-v3/testsuite/21_strings/headers/cuchar/functions_std_cxx20.cc
index df68fb7c82f..1964803cbd1 100644
--- a/libstdc++-v3/testsuite/21_strings/headers/cuchar/functions_std_cxx20.cc
+++ b/libstdc++-v3/testsuite/21_strings/headers/cuchar/functions_std_cxx20.cc
@@ -1,4 +1,3 @@
-// { dg-options "-std=c++20" }
 // { dg-do compile { target c++20 } }
 
 #include <cuchar>
diff --git a/libstdc++-v3/testsuite/23_containers/span/contiguous_range_neg.cc 
b/libstdc++-v3/testsuite/23_containers/span/contiguous_range_neg.cc
index d5f64922052..2ed44740a86 100644
--- a/libstdc++-v3/testsuite/23_containers/span/contiguous_range_neg.cc
+++ b/libstdc++-v3/testsuite/23_containers/span/contiguous_range_neg.cc
@@ -15,8 +15,7 @@
 // with this library; see the file COPYING3.  If not see
 // <http://www.gnu.org/licenses/>.
 
-// { dg-options "-std=c++2a" }
-// { dg-do compile { target c++2a } }
+// { dg-do compile { target c++20 } }
 
 #include <span>
 #include <deque>
diff --git a/libstdc++-v3/testsuite/23_containers/span/everything.cc 
b/libstdc++-v3/testsuite/23_containers/span/everything.cc
index 74f943e937f..31c17346dd3 100644
--- a/libstdc++-v3/testsuite/23_containers/span/everything.cc
+++ b/libstdc++-v3/testsuite/23_containers/span/everything.cc
@@ -15,8 +15,7 @@
 // with this library; see the file COPYING3.  If not see
 // <http://www.gnu.org/licenses/>.
 
-// { dg-options "-std=c++2a" }
-// { dg-do run { target c++2a } }
+// { dg-do run { target c++20 } }
 
 #include <testsuite_hooks.h>
 
-- 
2.41.0