On Linux/x86_64,

cf4ed3b41594b6935a337fe0aaf8149eadf88751 is the first bad commit
commit cf4ed3b41594b6935a337fe0aaf8149eadf88751
Author: Jonathan Wakely <jwak...@redhat.com>
Date:   Tue Dec 15 11:40:06 2020 +0000

    libstdc++: Use init_priority attribute for Init object [PR 98108]

caused

FAIL: g++.dg/pch/system-1.C  -g assembly comparison
FAIL: g++.dg/pch/system-1.C  -O2 assembly comparison
FAIL: g++.dg/pch/system-1.C  -O2 -g assembly comparison
FAIL: g++.dg/pch/system-2.C  -g assembly comparison
FAIL: g++.dg/pch/system-2.C  -O2 assembly comparison
FAIL: g++.dg/pch/system-2.C  -O2 -g assembly comparison
FAIL: g++.dg/warn/Wstringop-overflow-6.C  -std=gnu++14 (test for excess errors)
FAIL: g++.dg/warn/Wstringop-overflow-6.C  -std=gnu++17 (test for excess errors)
FAIL: g++.dg/warn/Wstringop-overflow-6.C  -std=gnu++2a (test for excess errors)

with GCC configured with

../../gcc/configure 
--prefix=/local/skpandey/gccwork/toolwork/gcc-bisect-master/master/r11-6072/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="pch.exp=g++.dg/pch/system-1.C 
--target_board='unix{-m32\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check RUNTESTFLAGS="pch.exp=g++.dg/pch/system-1.C 
--target_board='unix{-m64}'"
$ cd {build_dir}/gcc && make check RUNTESTFLAGS="pch.exp=g++.dg/pch/system-1.C 
--target_board='unix{-m64\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check RUNTESTFLAGS="pch.exp=g++.dg/pch/system-2.C 
--target_board='unix{-m32}'"
$ cd {build_dir}/gcc && make check RUNTESTFLAGS="pch.exp=g++.dg/pch/system-2.C 
--target_board='unix{-m32\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check RUNTESTFLAGS="pch.exp=g++.dg/pch/system-2.C 
--target_board='unix{-m64}'"
$ cd {build_dir}/gcc && make check RUNTESTFLAGS="pch.exp=g++.dg/pch/system-2.C 
--target_board='unix{-m64\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="dg.exp=g++.dg/warn/Wstringop-overflow-6.C 
--target_board='unix{-m32}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="dg.exp=g++.dg/warn/Wstringop-overflow-6.C 
--target_board='unix{-m32\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="dg.exp=g++.dg/warn/Wstringop-overflow-6.C 
--target_board='unix{-m64}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="dg.exp=g++.dg/warn/Wstringop-overflow-6.C 
--target_board='unix{-m64\ -march=cascadelake}'"

(Please do not reply to this email, for question about this report, contact me 
at skpgkp2 at gmail dot com)

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