[Linaro-TCWG-CI] gcc-17-987-g14617bda37f: 2 regressions on arm

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-17-987-g14617bda37f
  | Author: Nathan Myers <[email protected]>
  | Date:   Tue May 26 10:41:27 2026 -0400
  | 
  |     libstdc++: allocate_at_least ask only what it reports (P0401)
  |     
  |     allocate_at_least is rounding up the allocation request size to
  |     its default alignment, which may be more than an integral
  |     multiple of the object size requested. When the memory is freed,
  | ... 21 lines of the commit log omitted.

Produces 2 regressions:
  | 
  | regressions.sum:
  | Running g++:g++.dg/dg.exp ...
  | FAIL: g++.dg/tree-ssa/pr109442.C -std=gnu++23  scan-tree-dump-not optimized "_M_start"
  | FAIL: g++.dg/tree-ssa/pr109442.C -std=gnu++23  scan-tree-dump-not optimized "delete"

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-1917. (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.

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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/10283/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/10283/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/10283/archive/artifacts/sumfiles/xfails.xfail

Current build   : http://54.172.246.49:9090/jobs/tcwg_gcc_check--master-arm-build/builds/10283/archive/artifacts/
Reference build : http://54.172.246.49:9090/jobs/tcwg_gcc_check--master-arm-build/builds/10282/archive/artifacts/

Instruction to reproduce the build : https://gitlab.com/LinaroLtd/tcwg/ci/interesting-commits/-/raw/master/gcc/sha1/14617bda37f8c7e2da8efa335b47b41332a559eb/tcwg_gcc_check/master-arm/reproduction_instructions.txt

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