Hi,
I am unable to reproduce the issue, and cannot access the included log files to check the failure. Could you please share the revelant part of log, at least from time/hash.cc?
On Fri, Jan 9, 2026 at 10:23 PM ci_notify@linaro.org wrote:
Dear contributor,
Our automatic CI has detected problems related to your patch(es). Please find some details below.
In arm-eabi cortex-m55 hard, after: | commit gcc-16-5627-g4e7213aa081f | Author: Tomasz Kamiński tkaminsk@redhat.com | Date: Wed Nov 26 14:28:39 2025 +0100 | | libstdc++: Fix typo in operator used in __pack_ints [PR122864] | | `<=` was used instead of `<<`, this was detected by clang warning. | | PR libstdc++/122864 | ... 5 lines of the commit log omitted.
Produces 1 regression: | | regressions.sum: | Running libstdc++:libstdc++-dg/conformance.exp ... | FAIL: std/time/hash.cc -std=gnu++26 execution test
Used configuration : *CI config* tcwg_gnu_embed_check_gcc arm-eabi -mthumb -march=armv8.1-m.main+mve.fp+fp.dp -mtune=cortex-m55 -mfloat-abi=hard -mfpu=auto *configure and test flags:* --target arm-eabi --disable-multilib --with-mode=thumb --with-arch=armv8.1-m.main+mve.fp+fp.dp --with-float=hard --target_board=-mthumb/-march=armv8.1-m.main+mve.fp+fp.dp/-mtune=cortex-m55/-mfloat-abi=hard/-mfpu=auto qemu-cpu=cortex-m55
We track this bug report under https://linaro.atlassian.net/browse/GNU-1806. 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.
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The information below contains the details of the failures, and the ways to reproduce a debug environment:
You can find the failure logs in *.log.1.xz files in
https://ci.linaro.org/job/tcwg_gnu_embed_check_gcc--master-thumb_m55_hard_ea... The full lists of regressions and improvements as well as configure and make commands are in
https://ci.linaro.org/job/tcwg_gnu_embed_check_gcc--master-thumb_m55_hard_ea... The list of [ignored] baseline and flaky failures are in
https://ci.linaro.org/job/tcwg_gnu_embed_check_gcc--master-thumb_m55_hard_ea...
Current build : https://ci.linaro.org/job/tcwg_gnu_embed_check_gcc--master-thumb_m55_hard_ea... Reference build : https://ci.linaro.org/job/tcwg_gnu_embed_check_gcc--master-thumb_m55_hard_ea...
Instruction to reproduce the build : https://gitlab.com/LinaroLtd/tcwg/ci/interesting-commits/-/raw/master/gcc/sh...
Full commit : See in git+ssh://linaroci@gcc.gnu.org/git/gcc.git
Hello Tomasz,
Tomasz Kaminski via linaro-toolchain linaro-toolchain@lists.linaro.org writes:
I am unable to reproduce the issue,
Me neither. It should be possible, but for some reason I get build errors in libctf when trying to build a combined src tree.
and cannot access the included log files to check the failure.
Unfortunately our CI server removes job artifacts after a few weeks. Here's a more recent job which also shows the failure:
https://ci.linaro.org/job/tcwg_gnu_embed_check_gcc--master-thumb_m55_hard_ea...
Could you please share the revelant part of log, at least from time/hash.cc?
Looking at recent CI jobs, sometimes the "std/time/hash.cc -std=gnu++26 execution test" passes, and sometimes it fails.
Here is the relevant part of the log for a job where it fails:
Setting LD_LIBRARY_PATH to :/home/tcwg-buildslave/workspace/tcwg_gnu_0/abe/builds/x86_64-pc-linux-gnu/arm-eabi/gcc-gcc.git~master-stage2/gcc:/home/tcwg-buildslave/workspace/tcwg_gnu_0/abe/builds/x86_64-pc-linux-gnu/arm-eabi/gcc-gcc.git~master-stage2/arm-eabi/./libstdc++-v3/src/.libs::/home/tcwg-buildslave/workspace/tcwg_gnu_0/abe/builds/x86_64-pc-linux-gnu/arm-eabi/gcc-gcc.git~master-stage2/gcc:/home/tcwg-buildslave/workspace/tcwg_gnu_0/abe/builds/x86_64-pc-linux-gnu/arm-eabi/gcc-gcc.git~master-stage2/arm-eabi/./libstdc++-v3/src/.libs: Execution timeout is: 300 Running on qemu/-mthumb/-march=armv8.1-m.main+mve.fp+fp.dp/-mtune=cortex-m55/-mfloat-abi=hard/-mfpu=auto: timeout -k 30s 330s /home/tcwg-buildslave/workspace/tcwg_gnu_0/abe/scripts/qemu-wrapper.sh x86_64 arm cortex-m55 /home/tcwg-buildslave/workspace/tcwg_gnu_0/abe/builds/destdir/x86_64-pc-linux-gnu/arm-eabi ./hash.exe spawn [open ...] /home/tcwg-buildslave/workspace/tcwg_gnu_0/abe/snapshots/gcc.git~master/libstdc++-v3/testsuite/std/time/hash.cc:51: void test_unordered_set(const T&) [with T = std::chrono::year_month_weekday]: Assertion 'set.contains(t)' failed. FAIL: std/time/hash.cc -std=gnu++26 execution test
linaro-toolchain@lists.linaro.org
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Thiago Jung Bauermann -
Tomasz Kaminski