Re: [Linaro-TCWG-CI] gcc-17-570-g79e29562907b: 1 regression on aarch64

On Tue, May 19, 2026 at 2:22 AM <[email protected]> wrote:

> Dear contributor,
>
> Our automatic CI has detected problems related to your patch(es). Please
> find some details below.
>
> In  aarch64 native, after:
>   | commit gcc-17-570-g79e29562907b
>   | Author: Avi Kivity <[email protected]>
>   | Date:   Thu Feb 26 19:59:41 2026 +0200
>   |
>   |     libstdc++: optimize std::uninitialized_move{,_n}() to memcpy when
> possible [PR121789]
>   |
>   |     std::uninitialized_move{,_n} delegates to the corresponding
>   |     std::uninitialized_copy() variant after wrapping with a move
>   |     iterator, but the std::uninitialized_copy() doesn't unwrap the
>   | ... 17 lines of the commit log omitted.
>
> Produces 1 regression:
>   |
>   | regressions.sum:
>   | Running g++:g++.dg/torture/dg-torture.exp ...
>   | FAIL: g++.dg/torture/pr118521.C -O1  (test for excess errors)
>

I'll take a look.


>
> Used configuration :
>  *CI config* tcwg_gcc_check aarch64-linux-gnu
>  *configure and test flags:* none, autodetected on
> aarch64-unknown-linux-gnu--disable-multilib --enable-fix-cortex-a53-835769
> --enable-fix-cortex-a53-843419 --with-arch=armv8-a
>
> We track this bug report under
> https://linaro.atlassian.net/browse/GNU-1906. 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_gcc_check--master-aarch64-build/builds/10197/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_gcc_check--master-aarch64-build/builds/10197/archive/artifacts/notify/
> The list of [ignored] baseline and flaky failures are in
>  *
> http://54.172.246.49:9090/jobs/tcwg_gcc_check--master-aarch64-build/builds/10197/archive/artifacts/sumfiles/xfails.xfail
>
> Current build   :
> http://54.172.246.49:9090/jobs/tcwg_gcc_check--master-aarch64-build/builds/10197/archive/artifacts/
> Reference build :
> http://54.172.246.49:9090/jobs/tcwg_gcc_check--master-aarch64-build/builds/10196/archive/artifacts/
>
> Instruction to reproduce the build :
> https://gitlab.com/LinaroLtd/tcwg/ci/interesting-commits/-/raw/master/gcc/sha1/79e29562907b454cdb867195b34cf63156d2d0cc/tcwg_gcc_check/master-aarch64/reproduction_instructions.txt
>
> Full commit : See in git+ssh://[email protected]/git/gcc.git