Dear contributor,

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

In  armv8l-unknown-linux-gnueabihf native, after:
  | commit gcc-17-2704-gf678da4a9930
  | Author: Patrick Palka <[email protected]>
  | Date:   Sat Jul 25 16:12:13 2026 -0400
  | 
  |     libstdc++: Optimize flat_map range insertion for pair-like elements
  |     
  |     When inserting a range of pair-like elements we can avoid constructing a
  |     value_type (i.e. pair) temporary and instead obtain the corresponding 
key
  |     and value directly from *__first.
  | ... 14 lines of the commit log omitted.

Produces 2 regressions:
  | 
  | regressions.sum:
  | Running libstdc++:libstdc++-dg/conformance.exp ...
  | FAIL: 23_containers/flat_map/1.cc -std=gnu++23 execution test
  | FAIL: 23_containers/flat_map/1.cc -std=gnu++29 execution test

Used configuration :
 *CI config* tcwg_gcc_check armv8l-unknown-linux-gnueabihf
 *configure and test flags:* none, autodetected on 
armv8l-unknown-linux-gnueabihf--disable-multilib --with-float=hard 
--with-mode=thumb --with-tune=cortex-a9 --with-arch=armv7-a 
--with-fpu=neon-fp-armv8

We track this bug report under https://linaro.atlassian.net/browse/GNU-1978. 
(Require Linaro login) 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-arm-build/builds/10457/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-arm-build/builds/10457/archive/artifacts/notify/
The list of [ignored] baseline and flaky failures are in
 * 
http://54.172.246.49:9090/jobs/tcwg_gcc_check--master-arm-build/builds/10457/archive/artifacts/sumfiles/xfails.xfail

Current build   : 
http://54.172.246.49:9090/jobs/tcwg_gcc_check--master-arm-build/builds/10457/archive/artifacts/
Reference build : 
http://54.172.246.49:9090/jobs/tcwg_gcc_check--master-arm-build/builds/10456/archive/artifacts/

Instruction to reproduce the build : 
https://gitlab.com/LinaroLtd/tcwg/ci/interesting-commits/-/raw/master/gcc/sha1/f678da4a9930c8c0e3b4367cd2493ed26321fe54/tcwg_gcc_check/master-arm/reproduction_instructions.txt

Full commit : See in git+ssh://[email protected]/git/gcc.git

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