[r15-6060 Regression] FAIL: g++.dg/warn/uninit-pr105562.C -std=gnu++26 (test for excess errors) on Linux/x86_64

[haochen.jiang]

On Linux/x86_64,

e4a0157c2397c9b582cff71d114240a6b083a3dc is the first bad commit
commit e4a0157c2397c9b582cff71d114240a6b083a3dc
Author: Giuseppe D'Angelo <giuseppe.dangelo@kdab.com>
Date:   Mon Dec 9 02:11:19 2024 +0100

    libstdc++: port bitwise relocatable away from is_trivial

caused

FAIL: g++.dg/warn/uninit-pr105562.C  -std=gnu++11 (test for excess errors)
FAIL: g++.dg/warn/uninit-pr105562.C  -std=gnu++17 (test for excess errors)
FAIL: g++.dg/warn/uninit-pr105562.C  -std=gnu++26 (test for excess errors)

with GCC configured with

../../gcc/configure --prefix=/export/users/haochenj/src/gcc-bisect/master/master/r15-6060/usr --enable-clocale=gnu --with-system-zlib --with-demangler-in-ld --with-fpmath=sse --enable-languages=c,c++,fortran --enable-cet --without-isl --enable-libmpx x86_64-linux --disable-bootstrap

To reproduce:

$ cd {build_dir}/gcc && make check RUNTESTFLAGS="dg.exp=g++.dg/warn/uninit-pr105562.C --target_board='unix{-m32}'"
$ cd {build_dir}/gcc && make check RUNTESTFLAGS="dg.exp=g++.dg/warn/uninit-pr105562.C --target_board='unix{-m32\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check RUNTESTFLAGS="dg.exp=g++.dg/warn/uninit-pr105562.C --target_board='unix{-m64}'"
$ cd {build_dir}/gcc && make check RUNTESTFLAGS="dg.exp=g++.dg/warn/uninit-pr105562.C --target_board='unix{-m64\ -march=cascadelake}'"

(Please do not reply to this email, for question about this report, contact me at haochen dot jiang at intel.com.)
(If you met problems with cascadelake related, disabling AVX512F in command line might save that.)
(However, please make sure that there is no potential problems with AVX512.)