Dear contributor,

Our automatic CI has detected problems related to your patch(es). Please find some details below.

In  arm-eabi cortex-m33 hard, after:
  | commit gcc-17-2047-gb12fdd95251
  | Author: Jonathan Wakely <jwakely@redhat.com>
  | Date:   Mon Jun 22 14:41:02 2026 +0100
  | 
  |     libstdc++: Remove dependency on std::atomic<unsigned> in tzdb.cc
  |     
  |     My r17-471-ge79f0f818c0e42 change to optimize handling of leap seconds
  |     introduced a hard dependency on std::atomic<unsigned>, which causes
  |     problems for targets without atomic word operations, like Cortex-M0.:
  | ... 23 lines of the commit log omitted.

Produces Failure:
  | Results changed to
  | # reset_artifacts:
  | -10
  | # true:
  | 0
  | # build_abe binutils:
  | 1
  | # build_abe stage1 -- --set gcc_override_configure=--disable-multilib --set gcc_override_configure=--with-mode=thumb --set gcc_override_configure=--with-cpu=cortex-m33 --set gcc_override_configure=--with-float=hard:
  | 2
  | # build_abe newlib:
  | 4
  | # build_abe stage2 -- --set gcc_override_configure=--disable-multilib --set gcc_override_configure=--with-mode=thumb --set gcc_override_configure=--with-cpu=cortex-m33 --set gcc_override_configure=--with-float=hard:
  | # FAILED
  | # build_abe gdb:
  | # build_abe qemu:
  | # First few build errors in logs:
  | # 00:05:41 /home/tcwg-buildslave/workspace/tcwg_gnu_0/abe/snapshots/gcc.git~master/libstdc++-v3/src/c++20/tzdb.cc:1612:22: error: ‘struct std::chrono::tzdb_list::_Node::NumLeapSeconds’ has no member named ‘set_locked’
  | # 00:05:43 make[5]: *** [Makefile:575: tzdb.lo] Error 1
  | # 00:05:43 make[4]: *** [Makefile:802: all-recursive] Error 1
  | # 00:05:43 make[3]: *** [Makefile:580: all-recursive] Error 1
  | # 00:05:43 make[2]: *** [Makefile:505: all] Error 2
  | # 00:05:43 make[1]: *** [Makefile:12318: all-target-libstdc++-v3] Error 2
  | # 00:05:43 make: *** [Makefile:1093: all] Error 2
  | 
  | From
  | # reset_artifacts:
  | -10
  | # true:
  | 0
  | # build_abe binutils:
  | 1
  | # build_abe stage1 -- --set gcc_override_configure=--disable-multilib --set gcc_override_configure=--with-mode=thumb --set gcc_override_configure=--with-cpu=cortex-m33 --set gcc_override_configure=--with-float=hard:
  | 2
  | # build_abe newlib:
  | 4
  | # build_abe stage2 -- --set gcc_override_configure=--disable-multilib --set gcc_override_configure=--with-mode=thumb --set gcc_override_configure=--with-cpu=cortex-m33 --set gcc_override_configure=--with-float=hard:
  | 5
  | # build_abe gdb:
  | 6
  | # build_abe qemu:
  | 7

Used configuration :
 *CI config* tcwg_gnu_embed_build arm-eabi -mthumb -march=armv8-m.main+dsp+fp -mtune=cortex-m33 -mfloat-abi=hard -mfpu=auto
 *configure and test flags:* --target arm-eabi --disable-multilib --with-mode=thumb --with-cpu=cortex-m33 --with-float=hard --target_board=-mthumb/-march=armv8-m.main+dsp+fp/-mtune=cortex-m33/-mfloat-abi=hard/-mfpu=auto qemu-cpu=cortex-m33

We track this bug report under https://linaro.atlassian.net/browse/GNU-1941. (Require Linaro login) Please let us know if you have a fix.

If you have any questions regarding this report, please ask on linaro-toolchain@lists.linaro.org mailing list.

-----------------8<--------------------------8<--------------------------8<--------------------------

The information below contains the details of the failures, and the ways to reproduce a debug environment:

You can find the failure logs in
 * http://54.172.246.49:9090/jobs/tcwg_gnu_embed_build--master-thumb_m33_hard_eabi-build/builds/10035/archive/artifacts/
The full lists of regressions and improvements as well as configure and make commands are in
 * http://54.172.246.49:9090/jobs/tcwg_gnu_embed_build--master-thumb_m33_hard_eabi-build/builds/10035/archive/artifacts/notify/

Current build   : http://54.172.246.49:9090/jobs/tcwg_gnu_embed_build--master-thumb_m33_hard_eabi-build/builds/10035/archive/artifacts/
Reference build : http://54.172.246.49:9090/jobs/tcwg_gnu_embed_build--master-thumb_m33_hard_eabi-build/builds/10034/archive/artifacts/

Instruction to reproduce the build : https://gitlab.com/LinaroLtd/tcwg/ci/interesting-commits/-/raw/master/gcc/sha1/b12fdd952511786bf8d285e7080e94deeb32aa1d/tcwg_gnu_embed_build/master-thumb_m33_hard_eabi/reproduction_instructions.txt

Full commit : See in git+ssh://linaroci@gcc.gnu.org/git/gcc.git