Re: [Linaro-TCWG-CI] gcc-16-7460-g682c95b80872: no regression/no fix on master-thumb_m55_hard_eabi

Hi,

Neither the reference nor the current build includes later fixes for
zero_padding.cc file, in particular:

> commit 3a41229f92022bfb388911854d597721fce76714
> Author: Tomasz Kamiński <[email protected]>
> Date:   Thu Mar 5 08:57:24 2026 +0100
>
>   libstdc++: Fix atomic/cons/zero_padding.cc test for arm-none-eabi
[PR124124]
>
>    The test uses dg-require-atomic-cmpxchg-word that checks if atomic
compare
>    exchange is available for pointer sized integers, and then test types
that
>   are eight bytes in size. This causes issue for targets for which
pointers
>    are four byte and libatomic is not present, like arm-none-eabi.



> commit f3ba5ad088cebe117f857329a35b95d18d97a808
> Author: Tomasz Kamiński <[email protected]>
> Date:   Tue Feb 17 13:35:39 2026 +0100
>
>  libstdc++: Correct requirements for atomic/cons/zero_padding.cc tests
again [PR124124]
>
>    The requirements introduced in previous patch r16-7548-g060d7c2a9c1fe1,
 >   were not sufficient for types of size bigger than 64B (Ctor or long
double),
 >  as dg-add-options of libatomic, links libatomic only if it is required
to
 > handle atomics of 64B types or pointers.

Are issue still present on thunk build?


On Mon, Apr 20, 2026 at 10:28 PM <[email protected]> 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-16-7460-g682c95b80872
>   | Author: Tomasz Kamiński <[email protected]>
>   | Date:   Wed Feb 11 15:05:00 2026 +0100
>   |
>   |     libstdc++: Add test for atomic with padding on heap [PR123875]
>   |
>   |     C++26 makes the values of uninitialized stack object erroneous,
>   |     de-facto requiring their initialization, so adding a test for
>   |     variable on heap.
>   | ... 8 lines of the commit log omitted.
>
>
> 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-1877. Please let us know if you
> have a fix.
>
> If you have any questions regarding this report, please ask on
> [email protected] 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 *.log.1.xz files in
>  *
> http://54.172.246.49:9090/jobs/tcwg_gnu_embed_check_gcc--master-thumb_m55_hard_eabi-build/builds/10013/archive/artifacts/00-sumfiles/
> 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_check_gcc--master-thumb_m55_hard_eabi-build/builds/10013/archive/artifacts/notify/
> The list of [ignored] baseline and flaky failures are in
>  *
> http://54.172.246.49:9090/jobs/tcwg_gnu_embed_check_gcc--master-thumb_m55_hard_eabi-build/builds/10013/archive/artifacts/sumfiles/xfails.xfail
>
> Current build   :
> http://54.172.246.49:9090/jobs/tcwg_gnu_embed_check_gcc--master-thumb_m55_hard_eabi-build/builds/10013/archive/artifacts/
> Reference build :
> http://54.172.246.49:9090/jobs/tcwg_gnu_embed_check_gcc--master-thumb_m55_hard_eabi-build/builds/10010/archive/artifacts/
>
> Instruction to reproduce the build :
> https://gitlab.com/LinaroLtd/tcwg/ci/interesting-commits/-/raw/master/gcc/sha1/682c95b808724e6f876ea709b873ac6771704d7b/tcwg_gnu_embed_check_gcc/master-thumb_m55_hard_eabi/reproduction_instructions.txt
>
> Full commit : See in git+ssh://[email protected]/git/gcc.git
>