Some c++23 tests fail on targets that don't satisfy dg-require-cmath,
because referenced math functions don't get declared in std.  Add the
missing requirement.

Regstrapping on x86_64-linux-gnu.  Already successfully tested with
gcc-13 on aarch64-rtems, where it avoids the errors that come up because
math.h doesn't meet the cmath requirements there.  Ok to install?


for  libstdc++-v3/ChangeLog

        * testsuite/26_numerics/headers/cmath/constexpr_std_c++23.cc:
        Require cmath.
        * testsuite/26_numerics/headers/cmath/functions_std_c++23.cc:
        Likewise.
        * testsuite/26_numerics/headers/cmath/nextafter_std_c++23.cc:
        Likewise.
---
 .../headers/cmath/constexpr_std_c++23.cc           |    1 +
 .../headers/cmath/functions_std_c++23.cc           |    1 +
 .../26_numerics/headers/cmath/nextafter_c++23.cc   |    1 +
 3 files changed, 3 insertions(+)

diff --git 
a/libstdc++-v3/testsuite/26_numerics/headers/cmath/constexpr_std_c++23.cc 
b/libstdc++-v3/testsuite/26_numerics/headers/cmath/constexpr_std_c++23.cc
index 0e3d112fe2e80..3c2377fd6987b 100644
--- a/libstdc++-v3/testsuite/26_numerics/headers/cmath/constexpr_std_c++23.cc
+++ b/libstdc++-v3/testsuite/26_numerics/headers/cmath/constexpr_std_c++23.cc
@@ -16,6 +16,7 @@
 // <http://www.gnu.org/licenses/>.
 
 // { dg-do link { target c++23 } }
+// { dg-require-cmath "" }
 
 #include <stdfloat>
 #include <cmath>
diff --git 
a/libstdc++-v3/testsuite/26_numerics/headers/cmath/functions_std_c++23.cc 
b/libstdc++-v3/testsuite/26_numerics/headers/cmath/functions_std_c++23.cc
index 000cebf364aaa..ea68ac5da7551 100644
--- a/libstdc++-v3/testsuite/26_numerics/headers/cmath/functions_std_c++23.cc
+++ b/libstdc++-v3/testsuite/26_numerics/headers/cmath/functions_std_c++23.cc
@@ -16,6 +16,7 @@
 // <http://www.gnu.org/licenses/>.
 
 // { dg-do link { target c++23 } }
+// { dg-require-cmath "" }
 
 #include <stdfloat>
 #include <cmath>
diff --git 
a/libstdc++-v3/testsuite/26_numerics/headers/cmath/nextafter_c++23.cc 
b/libstdc++-v3/testsuite/26_numerics/headers/cmath/nextafter_c++23.cc
index 7d7e10bd8aea3..91767d22cc3f2 100644
--- a/libstdc++-v3/testsuite/26_numerics/headers/cmath/nextafter_c++23.cc
+++ b/libstdc++-v3/testsuite/26_numerics/headers/cmath/nextafter_c++23.cc
@@ -16,6 +16,7 @@
 // <http://www.gnu.org/licenses/>.
 
 // { dg-do run { target c++23 } }
+// { dg-require-cmath "" }
 
 #include <stdfloat>
 #include <cmath>

-- 
Alexandre Oliva, happy hacker            https://FSFLA.org/blogs/lxo/
   Free Software Activist                   GNU Toolchain Engineer
More tolerance and less prejudice are key for inclusion and diversity
Excluding neuro-others for not behaving ""normal"" is *not* inclusive

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