Re: [Linaro-TCWG-CI] gcc-17-1905-g70e630b6d29b: 5 regressions 5 fixes on master-thumb_m33_hard_eabi

On Thu, 2 Jul 2026 at 23:45, <[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-m33 hard, after:
>   | commit gcc-17-1905-g70e630b6d29b
>   | Author: Jonathan Wakely <[email protected]>
>   | Date:   Thu Jun 25 12:59:04 2026 +0100
>   |
>   |     libstdc++: Update feature test macros and tests for C++29
>   |
>   |     With r17-1595-g0c5c6249a2e9a7 G++ supports -std=c++29 so update our
>   |     feature test macro generation and testsuite to know about it.
>   |
>   | ... 19 lines of the commit log omitted.
>
> Produces 5 regressions 5 fixes:
>   |
>   | regressions.sum:
>   | Running libstdc++:libstdc++-dg/conformance.exp ...
>   | FAIL: 19_diagnostics/stacktrace/entry.cc -std=gnu++29 execution test
>   | FAIL: 19_diagnostics/stacktrace/output.cc -std=gnu++29 execution test
>   | FAIL: 19_diagnostics/stacktrace/stacktrace.cc -std=gnu++29 execution test
>   | FAIL: 27_io/print/2.cc -std=gnu++29 (test for excess errors)
>   | ... and 1 more
>   |
>   | fixes.sum:
>   | Running libstdc++:libstdc++-dg/conformance.exp ...
>   | FAIL: 19_diagnostics/stacktrace/entry.cc -std=gnu++26 execution test
>   | FAIL: 19_diagnostics/stacktrace/output.cc -std=gnu++26 execution test
>   | FAIL: 19_diagnostics/stacktrace/stacktrace.cc -std=gnu++26 execution test
>   | FAIL: 27_io/print/2.cc -std=gnu++26 (test for excess errors)
>   | ... and 1 more
>
> Used configuration :
>  *CI config* tcwg_gnu_embed_check_gcc 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-1942. (Require Linaro login) Please let us know if you have a fix.

This isn't really a regression, it's because the tests switched from
being run with -std=gnu++26 to -std=gnu++29, but they still FAIL the
same way.


>
> 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_m33_hard_eabi-build/builds/10099/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_m33_hard_eabi-build/builds/10099/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_m33_hard_eabi-build/builds/10099/archive/artifacts/sumfiles/xfails.xfail
>
> Current build   : http://54.172.246.49:9090/jobs/tcwg_gnu_embed_check_gcc--master-thumb_m33_hard_eabi-build/builds/10099/archive/artifacts/
> Reference build : http://54.172.246.49:9090/jobs/tcwg_gnu_embed_check_gcc--master-thumb_m33_hard_eabi-build/builds/10098/archive/artifacts/
>
> Instruction to reproduce the build : https://gitlab.com/LinaroLtd/tcwg/ci/interesting-commits/-/raw/master/gcc/sha1/70e630b6d29b750173920d19bd87c3930b7be532/tcwg_gnu_embed_check_gcc/master-thumb_m33_hard_eabi/reproduction_instructions.txt
>
> Full commit : See in git+ssh://[email protected]/git/gcc.git