On Linux/x86_64,

6c41a912f5e654a1b6f7cf8d6b23f00d8612988c is the first bad commit
commit 6c41a912f5e654a1b6f7cf8d6b23f00d8612988c
Author: Giuseppe D'Angelo <giuseppe.dang...@kdab.com>
Date:   Mon Dec 9 01:28:08 2024 +0100

    libstdc++: deprecate is_trivial for C++26 (P3247R2)

caused

FAIL: g++.dg/cpp0x/trivial1.C  -std=c++26 (test for excess errors)

with GCC configured with

../../gcc/configure 
--prefix=/export/users/haochenj/src/gcc-bisect/master/master/r15-6063/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/cpp0x/trivial1.C 
--target_board='unix{-m32}'"
$ cd {build_dir}/gcc && make check RUNTESTFLAGS="dg.exp=g++.dg/cpp0x/trivial1.C 
--target_board='unix{-m32\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check RUNTESTFLAGS="dg.exp=g++.dg/cpp0x/trivial1.C 
--target_board='unix{-m64}'"
$ cd {build_dir}/gcc && make check RUNTESTFLAGS="dg.exp=g++.dg/cpp0x/trivial1.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.)

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