Dear contributor,

Our automatic CI has detected problems related to your patch(es). Please find 
some details below.

In gcc_check master-arm, after:
  | commit gcc-16-1247-gbdae7824cd9
  | Author: Jonathan Wakely <jwak...@redhat.com>
  | Date:   Wed Jun 4 15:53:20 2025 +0100
  | 
  |     libstdc++: Optimize std::counting_semaphore for futex path
  |     
  |     Rename __semaphore_base to __semaphore_impl, because it's not used as a
  |     base class. Replace the three identical lambda expressions with a named
  |     class, __semaphore_impl::_Available, which stores the most recent
  | ... 27 lines of the commit log omitted.

Produces 7 regressions:
  | 
  | regressions.sum:
  | Running g++:g++.dg/modules/modules.exp ...
  | FAIL: g++.dg/modules/xtreme-header-2_b.C -std=c++26 (test for excess errors)
  | FAIL: g++.dg/modules/xtreme-header-5_b.C -std=c++26 (test for excess errors)
  | FAIL: g++.dg/modules/xtreme-header-6_b.C -std=c++26 (test for excess errors)
  | FAIL: g++.dg/modules/xtreme-header-7_b.C -std=c++26 (test for excess errors)
  | ... and 3 more

Used configuration :
 *CI config* tcwg_gcc_check master-arm
 *configure and test flags:* none, autodetected on 
armv8l-unknown-linux-gnueabihf

We track this bug report under https://linaro.atlassian.net/browse/GNU-1598. 
Please let us know if you have a fix.

If you have any questions regarding this report, please ask on 
linaro-toolch...@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_gcc_check--master-arm-build/3946/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_gcc_check--master-arm-build/3946/artifact/artifacts/notify/
The list of [ignored] baseline and flaky failures are in
 * 
https://ci.linaro.org/job/tcwg_gcc_check--master-arm-build/3946/artifact/artifacts/sumfiles/xfails.xfail

Current build   : 
https://ci.linaro.org/job/tcwg_gcc_check--master-arm-build/3946/artifact/artifacts
Reference build : 
https://ci.linaro.org/job/tcwg_gcc_check--master-arm-build/3945/artifact/artifacts

Instruction to reproduce the build : 
https://gitlab.com/Linaro/tcwg/ci/interesting-commits/-/raw/master/gcc/sha1/bdae7824cd9a9d27665bf1b82f60a761a9745a6a/tcwg_gcc_check/master-arm/reproduction_instructions.txt

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

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