On Mon, 16 Feb 2026, Tomasz Kamiński wrote:
> This test uses atomic<T>::compare_exchange_strong and thus may require
> libatomic and atomic-cmpxchg-word. The requirement on thread-fence and
> non_pch were superfulous.
>
> PR libstdc++/124124
>
> libstdc++-v3/ChangeLog:
>
> * testsuite/29_atomics/atomic/cons/zero_padding.cc: Adjust
> dg-require.
> ---
> It looks like I copied the dg-options from value_init.cc test, and
> forgotten to update them:
> * no_pch was due feature test macro test,
> * thread-fence was due use of the loads
> The test however uses compare_exchange.
>
> Testing on x86_64-linux. zero_padding.cc test already passed.
> OK for trunk when test passes?
LGTM, these are what compare_exchange_padding.cc uses.
>
> libstdc++-v3/testsuite/29_atomics/atomic/cons/zero_padding.cc | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/libstdc++-v3/testsuite/29_atomics/atomic/cons/zero_padding.cc
> b/libstdc++-v3/testsuite/29_atomics/atomic/cons/zero_padding.cc
> index ad48d66de3a..3c8a4a8f428 100644
> --- a/libstdc++-v3/testsuite/29_atomics/atomic/cons/zero_padding.cc
> +++ b/libstdc++-v3/testsuite/29_atomics/atomic/cons/zero_padding.cc
> @@ -1,6 +1,6 @@
> // { dg-do run { target c++11 } }
> -// { dg-require-thread-fence "" }
> -// { dg-add-options no_pch }
> +// { dg-require-atomic-cmpxchg-word "" }
> +// { dg-add-options libatomic }
>
> #include <atomic>
> #include <cstring>
> --
> 2.53.0
>
>
