Re: [PATCH] testsuite: add dg-require-atomic-cmpxchg-word to chrono tests

Fri, 12 Jun 2026 03:02:06 -0700 



On 2026-06-12 11:49, Jonathan Wakely wrote:

On Mon, 8 Jun 2026 at 14:21, Torbjörn SVENSSON
<[email protected]> wrote:


Ok for trunk?


Hmm, I think I'd rather make this work without atomics.
I can look at this on Monday.


That would be even better.
If you find a way to make this work without atomics, please let me know and 
I'll drop this patch from my queue.

Btw, forgot to mention that I see the error starting with 
r17-471-ge79f0f818c0e42.

Kind regards,
Torbjörn





Kind regards,
Torbjörn

--

On target that does not support atomic word operations, like Cortex-M0,
the following error can be seen in the logs:

/build/r17-1372-g80b78b2504fba0/arm-none-eabi/bin/ld: 
/build/r17-1372-g80b78b2504fba0/bin/../lib/gcc/arm-none-eabi/17.0.0/../../../../arm-none-eabi/lib/thumb/v6-m/nofp/libstdc++.a(tzdb.o):
 in function 
`std::chrono::__detail::__recent_leap_second_info(std::chrono::leap_second_info&,
 unsigned int)':
(.text._ZNSt6chrono8__detail25__recent_leap_second_infoERNS_16leap_second_infoEj+0xf0):
 undefined reference to `__atomic_compare_exchange_4'
/build/r17-1372-g80b78b2504fba0/arm-none-eabi/bin/ld: 
(__atomic_compare_exchange_4): Unknown destination type (ARM/Thumb) in 
/build/r17-1372-g80b78b2504fba0/bin/../lib/gcc/arm-none-eabi/17.0.0/../../../../arm-none-eabi/lib/thumb/v6-m/nofp/libstdc++.a(tzdb.o)
(.text._ZNSt6chrono8__detail25__recent_leap_second_infoERNS_16leap_second_infoEj+0xf0):
 dangerous relocation: unsupported relocation
collect2: error: ld returned 1 exit status

libstdc++-v3/ChangeLog:

         * testsuite/std/time/clock/gps/1.cc: Add
         dg-require-atomic-cmpxchg-word to test.
         * testsuite/std/time/clock/tai/1.cc: Likewise.
         * testsuite/std/time/clock/utc/1.cc: Likewise.
         * testsuite/std/time/clock/utc/io.cc: Likewise.
         * testsuite/std/time/clock/utc/leap_second_info-2.cc: Likewise.
         * testsuite/std/time/clock/utc/leap_second_info.cc: Likewise.
         * testsuite/std/time/exceptions.cc: Likewise.
         * testsuite/std/time/format/empty_spec.cc: Likewise.
         * testsuite/std/time/format/format.cc: Likewise.
         * testsuite/std/time/hash.cc: Likewise.
         * testsuite/std/time/leap_seconds/io.cc: Likewise.
         * testsuite/std/time/parse/114240.cc: Likewise.
         * testsuite/std/time/parse/114279.cc: Likewise.
         * testsuite/std/time/time_zone/116110.cc: Likewise.
         * testsuite/std/time/time_zone/124513.cc: Likewise.
         * testsuite/std/time/time_zone/get_info_local.cc: Likewise.
         * testsuite/std/time/time_zone/get_info_sys.cc: Likewise.
         * testsuite/std/time/time_zone/numeric_save.cc: Likewise.
         * testsuite/std/time/time_zone/sys_info_abbrev.cc: Likewise.
         * testsuite/std/time/time_zone/until_day_on.cc: Likewise.
         * testsuite/std/time/tzdb/1.cc: Likewise.
         * testsuite/std/time/tzdb/leap_seconds.cc: Likewise.
         * testsuite/std/time/tzdb/links.cc: Likewise.
         * testsuite/std/time/tzdb_list/1.cc: Likewise.
         * testsuite/std/time/tzdb_list/pr118811.cc: Likewise.
         * testsuite/std/time/zoned_time/1.cc: Likewise.
         * testsuite/std/time/zoned_time/custom.cc: Likewise.
         * testsuite/std/time/zoned_time/io.cc: Likewise.
         * testsuite/std/time/zoned_traits.cc: Likewise.

Signed-off-by: Torbjörn SVENSSON <[email protected]>
---
  libstdc++-v3/testsuite/std/time/clock/gps/1.cc                  | 1 +
  libstdc++-v3/testsuite/std/time/clock/tai/1.cc                  | 1 +
  libstdc++-v3/testsuite/std/time/clock/utc/1.cc                  | 1 +
  libstdc++-v3/testsuite/std/time/clock/utc/io.cc                 | 1 +
  libstdc++-v3/testsuite/std/time/clock/utc/leap_second_info-2.cc | 1 +
  libstdc++-v3/testsuite/std/time/clock/utc/leap_second_info.cc   | 1 +
  libstdc++-v3/testsuite/std/time/exceptions.cc                   | 1 +
  libstdc++-v3/testsuite/std/time/format/empty_spec.cc            | 1 +
  libstdc++-v3/testsuite/std/time/format/format.cc                | 1 +
  libstdc++-v3/testsuite/std/time/hash.cc                         | 1 +
  libstdc++-v3/testsuite/std/time/leap_seconds/io.cc              | 1 +
  libstdc++-v3/testsuite/std/time/parse/114240.cc                 | 1 +
  libstdc++-v3/testsuite/std/time/parse/114279.cc                 | 1 +
  libstdc++-v3/testsuite/std/time/time_zone/116110.cc             | 1 +
  libstdc++-v3/testsuite/std/time/time_zone/124513.cc             | 1 +
  libstdc++-v3/testsuite/std/time/time_zone/get_info_local.cc     | 1 +
  libstdc++-v3/testsuite/std/time/time_zone/get_info_sys.cc       | 1 +
  libstdc++-v3/testsuite/std/time/time_zone/numeric_save.cc       | 1 +
  libstdc++-v3/testsuite/std/time/time_zone/sys_info_abbrev.cc    | 1 +
  libstdc++-v3/testsuite/std/time/time_zone/until_day_on.cc       | 1 +
  libstdc++-v3/testsuite/std/time/tzdb/1.cc                       | 1 +
  libstdc++-v3/testsuite/std/time/tzdb/leap_seconds.cc            | 1 +
  libstdc++-v3/testsuite/std/time/tzdb/links.cc                   | 1 +
  libstdc++-v3/testsuite/std/time/tzdb_list/1.cc                  | 1 +
  libstdc++-v3/testsuite/std/time/tzdb_list/pr118811.cc           | 1 +
  libstdc++-v3/testsuite/std/time/zoned_time/1.cc                 | 1 +
  libstdc++-v3/testsuite/std/time/zoned_time/custom.cc            | 1 +
  libstdc++-v3/testsuite/std/time/zoned_time/io.cc                | 1 +
  libstdc++-v3/testsuite/std/time/zoned_traits.cc                 | 1 +
  29 files changed, 29 insertions(+)

diff --git a/libstdc++-v3/testsuite/std/time/clock/gps/1.cc 
b/libstdc++-v3/testsuite/std/time/clock/gps/1.cc
index 8be517b316b..48ae2e9b3ae 100644
--- a/libstdc++-v3/testsuite/std/time/clock/gps/1.cc
+++ b/libstdc++-v3/testsuite/std/time/clock/gps/1.cc
@@ -1,4 +1,5 @@
  // { dg-do run { target c++20 } }
+// { dg-require-atomic-cmpxchg-word "" }

  #include <chrono>
  #include <testsuite_hooks.h>
diff --git a/libstdc++-v3/testsuite/std/time/clock/tai/1.cc 
b/libstdc++-v3/testsuite/std/time/clock/tai/1.cc
index 63cc9927859..5ad27d4f532 100644
--- a/libstdc++-v3/testsuite/std/time/clock/tai/1.cc
+++ b/libstdc++-v3/testsuite/std/time/clock/tai/1.cc
@@ -1,4 +1,5 @@
  // { dg-do run { target c++20 } }
+// { dg-require-atomic-cmpxchg-word "" }

  #include <chrono>
  #include <testsuite_hooks.h>
diff --git a/libstdc++-v3/testsuite/std/time/clock/utc/1.cc 
b/libstdc++-v3/testsuite/std/time/clock/utc/1.cc
index 4852658001e..f574ff41686 100644
--- a/libstdc++-v3/testsuite/std/time/clock/utc/1.cc
+++ b/libstdc++-v3/testsuite/std/time/clock/utc/1.cc
@@ -1,4 +1,5 @@
  // { dg-do run { target c++20 } }
+// { dg-require-atomic-cmpxchg-word "" }

  #include <chrono>
  #include <testsuite_hooks.h>
diff --git a/libstdc++-v3/testsuite/std/time/clock/utc/io.cc 
b/libstdc++-v3/testsuite/std/time/clock/utc/io.cc
index ed1daa7a855..8e168bc35d7 100644
--- a/libstdc++-v3/testsuite/std/time/clock/utc/io.cc
+++ b/libstdc++-v3/testsuite/std/time/clock/utc/io.cc
@@ -1,4 +1,5 @@
  // { dg-do run { target c++20 } }
+// { dg-require-atomic-cmpxchg-word "" }
  // { dg-timeout-factor 2 }

  #include <chrono>
diff --git a/libstdc++-v3/testsuite/std/time/clock/utc/leap_second_info-2.cc 
b/libstdc++-v3/testsuite/std/time/clock/utc/leap_second_info-2.cc
index 59634b34944..7cf97ca271d 100644
--- a/libstdc++-v3/testsuite/std/time/clock/utc/leap_second_info-2.cc
+++ b/libstdc++-v3/testsuite/std/time/clock/utc/leap_second_info-2.cc
@@ -1,4 +1,5 @@
  // { dg-do run { target c++20 } }
+// { dg-require-atomic-cmpxchg-word "" }
  // { dg-require-effective-target tzdb }
  // { dg-require-effective-target cxx11_abi }
  // { dg-xfail-run-if "no weak override on AIX" { powerpc-ibm-aix* } }
diff --git a/libstdc++-v3/testsuite/std/time/clock/utc/leap_second_info.cc 
b/libstdc++-v3/testsuite/std/time/clock/utc/leap_second_info.cc
index 2fabda49423..7272772188a 100644
--- a/libstdc++-v3/testsuite/std/time/clock/utc/leap_second_info.cc
+++ b/libstdc++-v3/testsuite/std/time/clock/utc/leap_second_info.cc
@@ -1,4 +1,5 @@
  // { dg-do run { target c++20 } }
+// { dg-require-atomic-cmpxchg-word "" }
  // { dg-additional-options "-DHAVE_TZDB" { target tzdb } }

  #include <chrono>
diff --git a/libstdc++-v3/testsuite/std/time/exceptions.cc 
b/libstdc++-v3/testsuite/std/time/exceptions.cc
index 06b8a53c353..e455eb6f271 100644
--- a/libstdc++-v3/testsuite/std/time/exceptions.cc
+++ b/libstdc++-v3/testsuite/std/time/exceptions.cc
@@ -1,4 +1,5 @@
  // { dg-do run { target c++20 } }
+// { dg-require-atomic-cmpxchg-word "" }
  // { dg-require-effective-target tzdb }

  #include <chrono>
diff --git a/libstdc++-v3/testsuite/std/time/format/empty_spec.cc 
b/libstdc++-v3/testsuite/std/time/format/empty_spec.cc
index b84f84a3069..6eef475d815 100644
--- a/libstdc++-v3/testsuite/std/time/format/empty_spec.cc
+++ b/libstdc++-v3/testsuite/std/time/format/empty_spec.cc
@@ -1,4 +1,5 @@
  // { dg-do run { target c++20 } }
+// { dg-require-atomic-cmpxchg-word "" }
  // { dg-require-effective-target hosted }
  // { dg-timeout-factor 5 }

diff --git a/libstdc++-v3/testsuite/std/time/format/format.cc 
b/libstdc++-v3/testsuite/std/time/format/format.cc
index d1aee053acd..ac8c1cc1f59 100644
--- a/libstdc++-v3/testsuite/std/time/format/format.cc
+++ b/libstdc++-v3/testsuite/std/time/format/format.cc
@@ -1,4 +1,5 @@
  // { dg-do run { target c++20 } }
+// { dg-require-atomic-cmpxchg-word "" }
  // { dg-timeout-factor 2 }

  #include <chrono>
diff --git a/libstdc++-v3/testsuite/std/time/hash.cc 
b/libstdc++-v3/testsuite/std/time/hash.cc
index ed9139bb810..a511099207e 100644
--- a/libstdc++-v3/testsuite/std/time/hash.cc
+++ b/libstdc++-v3/testsuite/std/time/hash.cc
@@ -1,4 +1,5 @@
  // { dg-do run { target c++26 } }
+// { dg-require-atomic-cmpxchg-word "" }

  #include <chrono>
  #include <unordered_set>
diff --git a/libstdc++-v3/testsuite/std/time/leap_seconds/io.cc 
b/libstdc++-v3/testsuite/std/time/leap_seconds/io.cc
index 511fafdd1a0..3c721f29543 100644
--- a/libstdc++-v3/testsuite/std/time/leap_seconds/io.cc
+++ b/libstdc++-v3/testsuite/std/time/leap_seconds/io.cc
@@ -1,4 +1,5 @@
  // { dg-do run { target c++20 } }
+// { dg-require-atomic-cmpxchg-word "" }
  // { dg-require-effective-target tzdb }
  // { dg-require-effective-target cxx11_abi }

diff --git a/libstdc++-v3/testsuite/std/time/parse/114240.cc 
b/libstdc++-v3/testsuite/std/time/parse/114240.cc
index 46310efd09a..188690ab9d9 100644
--- a/libstdc++-v3/testsuite/std/time/parse/114240.cc
+++ b/libstdc++-v3/testsuite/std/time/parse/114240.cc
@@ -1,4 +1,5 @@
  // { dg-do run { target c++20 } }
+// { dg-require-atomic-cmpxchg-word "" }

  // PR libstdc++/114240 sys_days not being parsed with only a date in the 
stream

diff --git a/libstdc++-v3/testsuite/std/time/parse/114279.cc 
b/libstdc++-v3/testsuite/std/time/parse/114279.cc
index 67e5cba23bd..dbb9fdb5774 100644
--- a/libstdc++-v3/testsuite/std/time/parse/114279.cc
+++ b/libstdc++-v3/testsuite/std/time/parse/114279.cc
@@ -1,4 +1,5 @@
  // { dg-do run { target c++20 } }
+// { dg-require-atomic-cmpxchg-word "" }

  #include <chrono>
  #include <sstream>
diff --git a/libstdc++-v3/testsuite/std/time/time_zone/116110.cc 
b/libstdc++-v3/testsuite/std/time/time_zone/116110.cc
index 26b9ba33c31..47fa427b7f7 100644
--- a/libstdc++-v3/testsuite/std/time/time_zone/116110.cc
+++ b/libstdc++-v3/testsuite/std/time/time_zone/116110.cc
@@ -1,4 +1,5 @@
  // { dg-do run { target c++20 } }
+// { dg-require-atomic-cmpxchg-word "" }
  // { dg-require-effective-target tzdb }
  // { dg-require-effective-target cxx11_abi }

diff --git a/libstdc++-v3/testsuite/std/time/time_zone/124513.cc 
b/libstdc++-v3/testsuite/std/time/time_zone/124513.cc
index 49d7ba8bb01..c02beb28147 100644
--- a/libstdc++-v3/testsuite/std/time/time_zone/124513.cc
+++ b/libstdc++-v3/testsuite/std/time/time_zone/124513.cc
@@ -1,4 +1,5 @@
  // { dg-do run { target c++20 } }
+// { dg-require-atomic-cmpxchg-word "" }
  // { dg-require-effective-target tzdb }
  // { dg-require-effective-target cxx11_abi }
  // { dg-xfail-run-if "no weak override on AIX" { powerpc-ibm-aix* } }
diff --git a/libstdc++-v3/testsuite/std/time/time_zone/get_info_local.cc 
b/libstdc++-v3/testsuite/std/time/time_zone/get_info_local.cc
index d2972aca7df..609dc6ae49a 100644
--- a/libstdc++-v3/testsuite/std/time/time_zone/get_info_local.cc
+++ b/libstdc++-v3/testsuite/std/time/time_zone/get_info_local.cc
@@ -1,4 +1,5 @@
  // { dg-do run { target c++20 } }
+// { dg-require-atomic-cmpxchg-word "" }
  // { dg-require-effective-target tzdb }

  #include <chrono>
diff --git a/libstdc++-v3/testsuite/std/time/time_zone/get_info_sys.cc 
b/libstdc++-v3/testsuite/std/time/time_zone/get_info_sys.cc
index 88f16b76ff4..05f1b40cf65 100644
--- a/libstdc++-v3/testsuite/std/time/time_zone/get_info_sys.cc
+++ b/libstdc++-v3/testsuite/std/time/time_zone/get_info_sys.cc
@@ -1,4 +1,5 @@
  // { dg-do run { target c++20 } }
+// { dg-require-atomic-cmpxchg-word "" }
  // { dg-require-effective-target tzdb }

  #include <chrono>
diff --git a/libstdc++-v3/testsuite/std/time/time_zone/numeric_save.cc 
b/libstdc++-v3/testsuite/std/time/time_zone/numeric_save.cc
index 687524bb355..4761e3d3c5e 100644
--- a/libstdc++-v3/testsuite/std/time/time_zone/numeric_save.cc
+++ b/libstdc++-v3/testsuite/std/time/time_zone/numeric_save.cc
@@ -1,4 +1,5 @@
  // { dg-do run { target c++20 } }
+// { dg-require-atomic-cmpxchg-word "" }
  // { dg-require-effective-target tzdb }
  // { dg-require-effective-target cxx11_abi }
  // { dg-xfail-run-if "no weak override on AIX" { powerpc-ibm-aix* } }
diff --git a/libstdc++-v3/testsuite/std/time/time_zone/sys_info_abbrev.cc 
b/libstdc++-v3/testsuite/std/time/time_zone/sys_info_abbrev.cc
index f1a8fff02f5..86508c543a0 100644
--- a/libstdc++-v3/testsuite/std/time/time_zone/sys_info_abbrev.cc
+++ b/libstdc++-v3/testsuite/std/time/time_zone/sys_info_abbrev.cc
@@ -1,4 +1,5 @@
  // { dg-do run { target c++20 } }
+// { dg-require-atomic-cmpxchg-word "" }
  // { dg-require-effective-target tzdb }
  // { dg-require-effective-target cxx11_abi }
  // { dg-xfail-run-if "no weak override on AIX" { powerpc-ibm-aix* } }
diff --git a/libstdc++-v3/testsuite/std/time/time_zone/until_day_on.cc 
b/libstdc++-v3/testsuite/std/time/time_zone/until_day_on.cc
index 38e4bc254cc..9ca407655ab 100644
--- a/libstdc++-v3/testsuite/std/time/time_zone/until_day_on.cc
+++ b/libstdc++-v3/testsuite/std/time/time_zone/until_day_on.cc
@@ -1,4 +1,5 @@
  // { dg-do run { target c++20 } }
+// { dg-require-atomic-cmpxchg-word "" }
  // { dg-require-effective-target tzdb }
  // { dg-require-effective-target cxx11_abi }
  // { dg-xfail-run-if "no weak override on AIX" { powerpc-ibm-aix* } }
diff --git a/libstdc++-v3/testsuite/std/time/tzdb/1.cc 
b/libstdc++-v3/testsuite/std/time/tzdb/1.cc
index 7a31c1c20ba..d68968da226 100644
--- a/libstdc++-v3/testsuite/std/time/tzdb/1.cc
+++ b/libstdc++-v3/testsuite/std/time/tzdb/1.cc
@@ -1,4 +1,5 @@
  // { dg-do run { target c++20 } }
+// { dg-require-atomic-cmpxchg-word "" }
  // { dg-require-effective-target cxx11_abi }

  #include <chrono>
diff --git a/libstdc++-v3/testsuite/std/time/tzdb/leap_seconds.cc 
b/libstdc++-v3/testsuite/std/time/tzdb/leap_seconds.cc
index 5999635a89f..0a1cf04a62e 100644
--- a/libstdc++-v3/testsuite/std/time/tzdb/leap_seconds.cc
+++ b/libstdc++-v3/testsuite/std/time/tzdb/leap_seconds.cc
@@ -1,4 +1,5 @@
  // { dg-do run { target c++20 } }
+// { dg-require-atomic-cmpxchg-word "" }
  // { dg-require-effective-target tzdb }
  // { dg-require-effective-target cxx11_abi }
  // { dg-xfail-run-if "no weak override on AIX" { powerpc-ibm-aix* } }
diff --git a/libstdc++-v3/testsuite/std/time/tzdb/links.cc 
b/libstdc++-v3/testsuite/std/time/tzdb/links.cc
index 0ba214846c6..676e1ba7804 100644
--- a/libstdc++-v3/testsuite/std/time/tzdb/links.cc
+++ b/libstdc++-v3/testsuite/std/time/tzdb/links.cc
@@ -1,4 +1,5 @@
  // { dg-do run { target c++20 } }
+// { dg-require-atomic-cmpxchg-word "" }
  // { dg-require-effective-target tzdb }
  // { dg-require-effective-target cxx11_abi }
  // { dg-xfail-run-if "no weak override on AIX" { powerpc-ibm-aix* } }
diff --git a/libstdc++-v3/testsuite/std/time/tzdb_list/1.cc 
b/libstdc++-v3/testsuite/std/time/tzdb_list/1.cc
index 587aa950277..18827f15378 100644
--- a/libstdc++-v3/testsuite/std/time/tzdb_list/1.cc
+++ b/libstdc++-v3/testsuite/std/time/tzdb_list/1.cc
@@ -1,4 +1,5 @@
  // { dg-do run { target c++20 } }
+// { dg-require-atomic-cmpxchg-word "" }
  // { dg-require-effective-target tzdb }
  // { dg-require-effective-target cxx11_abi }

diff --git a/libstdc++-v3/testsuite/std/time/tzdb_list/pr118811.cc 
b/libstdc++-v3/testsuite/std/time/tzdb_list/pr118811.cc
index fe86602ecce..38139e5ca38 100644
--- a/libstdc++-v3/testsuite/std/time/tzdb_list/pr118811.cc
+++ b/libstdc++-v3/testsuite/std/time/tzdb_list/pr118811.cc
@@ -1,4 +1,5 @@
  // { dg-do run { target c++20 } }
+// { dg-require-atomic-cmpxchg-word "" }
  // { dg-require-effective-target tzdb }
  // { dg-require-effective-target cxx11_abi }
  // { dg-require-static-libstdcxx "" }
diff --git a/libstdc++-v3/testsuite/std/time/zoned_time/1.cc 
b/libstdc++-v3/testsuite/std/time/zoned_time/1.cc
index a77cd99dd55..dfead853e26 100644
--- a/libstdc++-v3/testsuite/std/time/zoned_time/1.cc
+++ b/libstdc++-v3/testsuite/std/time/zoned_time/1.cc
@@ -1,4 +1,5 @@
  // { dg-do run { target c++20 } }
+// { dg-require-atomic-cmpxchg-word "" }
  // { dg-require-effective-target tzdb }
  // { dg-require-effective-target cxx11_abi }

diff --git a/libstdc++-v3/testsuite/std/time/zoned_time/custom.cc 
b/libstdc++-v3/testsuite/std/time/zoned_time/custom.cc
index 83e1f6dca43..1f5056c3c76 100644
--- a/libstdc++-v3/testsuite/std/time/zoned_time/custom.cc
+++ b/libstdc++-v3/testsuite/std/time/zoned_time/custom.cc
@@ -1,4 +1,5 @@
  // { dg-do run { target c++20 } }
+// { dg-require-atomic-cmpxchg-word "" }
  // { dg-require-effective-target tzdb }

  #include <chrono>
diff --git a/libstdc++-v3/testsuite/std/time/zoned_time/io.cc 
b/libstdc++-v3/testsuite/std/time/zoned_time/io.cc
index c113eea6d3f..a95bc629698 100644
--- a/libstdc++-v3/testsuite/std/time/zoned_time/io.cc
+++ b/libstdc++-v3/testsuite/std/time/zoned_time/io.cc
@@ -1,4 +1,5 @@
  // { dg-do run { target c++20 } }
+// { dg-require-atomic-cmpxchg-word "" }
  // { dg-require-effective-target cxx11_abi }
  // { dg-timeout-factor 2 }

diff --git a/libstdc++-v3/testsuite/std/time/zoned_traits.cc 
b/libstdc++-v3/testsuite/std/time/zoned_traits.cc
index 83cf6635127..4ccf6e74aaf 100644
--- a/libstdc++-v3/testsuite/std/time/zoned_traits.cc
+++ b/libstdc++-v3/testsuite/std/time/zoned_traits.cc
@@ -1,4 +1,5 @@
  // { dg-do run { target c++20 } }
+// { dg-require-atomic-cmpxchg-word "" }
  // { dg-require-effective-target cxx11_abi }

  #include <chrono>
--
2.43.0



























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