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-16-5628-g00443885755
  | Author: Jakub Jelinek <jakub@redhat.com>
  | Date:   Wed Nov 26 15:01:11 2025 +0100
  | 
  |     Change the default C++ dialect to gnu++20
  |     
  |     On Mon, Nov 03, 2025 at 01:34:28PM -0500, Marek Polacek via Gcc wrote:
  |     > I would like us to declare that C++20 is no longer experimental and
  |     > change the default dialect to gnu++20.  Last time we changed the default
  | ... 75 lines of the commit log omitted.

Produces 5 regressions 5 fixes:
  | 
  | regressions.sum:
  | Running g++:g++.dg/dg.exp ...
  | FAIL: g++.dg/ext/arm-fp16/arm-fp16-ops-3.C -std=c++20 execution test
  | FAIL: g++.dg/ext/arm-fp16/arm-fp16-ops-4.C -std=gnu++20 execution test
  | FAIL: g++.dg/ipa/devirt-2.C -std=gnu++20  scan-ipa-dump cp "Discovered a virtual call to a known target.*B::foo"
  | XPASS: g++.dg/ipa/devirt-23.C -std=gnu++20  scan-ipa-dump cp "Discovered a virtual call to"
  | ... and 1 more
  | 
  | fixes.sum:
  | Running g++:g++.dg/dg.exp ...
  | FAIL: g++.dg/ext/arm-fp16/arm-fp16-ops-3.C -std=c++17 execution test
  | FAIL: g++.dg/ext/arm-fp16/arm-fp16-ops-4.C -std=gnu++17 execution test
  | FAIL: g++.dg/ipa/devirt-2.C -std=gnu++17  scan-ipa-dump cp "Discovered a virtual call to a known target.*B::foo"
  | XPASS: g++.dg/ipa/devirt-23.C -std=gnu++17  scan-ipa-dump cp "Discovered a virtual call to"
  | ... 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-1762. 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 *.log.1.xz files in
 * https://ci.linaro.org/job/tcwg_gnu_embed_check_gcc--master-thumb_m33_hard_eabi-build/668/artifact/artifacts/00-sumfiles/
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_m33_hard_eabi-build/668/artifact/artifacts/notify/
The list of [ignored] baseline and flaky failures are in
 * https://ci.linaro.org/job/tcwg_gnu_embed_check_gcc--master-thumb_m33_hard_eabi-build/668/artifact/artifacts/sumfiles/xfails.xfail

Current build   : https://ci.linaro.org/job/tcwg_gnu_embed_check_gcc--master-thumb_m33_hard_eabi-build/668/artifact/artifacts
Reference build : https://ci.linaro.org/job/tcwg_gnu_embed_check_gcc--master-thumb_m33_hard_eabi-build/667/artifact/artifacts

Instruction to reproduce the build : https://gitlab.com/LinaroLtd/tcwg/ci/interesting-commits/-/raw/master/gcc/sha1/004438857554f47eb5491d59b067e56fdacf0e74/tcwg_gnu_embed_check_gcc/master-thumb_m33_hard_eabi/reproduction_instructions.txt

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