On Linux/x86_64,

de196e5dd8ea4d0ed01a8c265afdd3676e27545b is the first bad commit
commit de196e5dd8ea4d0ed01a8c265afdd3676e27545b
Author: Jonathan Wakely <jwak...@redhat.com>
Date:   Tue Jan 11 18:42:38 2022 +0000

    libstdc++: Add attribute to features deprecated in C++17 [PR91260]

caused

FAIL: g++.old-deja/g++.robertl/eb43.C  -std=c++14 (test for excess errors)
FAIL: g++.old-deja/g++.robertl/eb43.C  -std=c++17 (test for excess errors)
FAIL: g++.old-deja/g++.robertl/eb43.C  -std=c++2a (test for excess errors)

with GCC configured with

../../gcc/configure 
--prefix=/local/skpandey/gccwork/toolwork/gcc-bisect-master/master/r12-6581/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="old-deja.exp=g++.old-deja/g++.robertl/eb43.C 
--target_board='unix{-m32}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="old-deja.exp=g++.old-deja/g++.robertl/eb43.C 
--target_board='unix{-m32\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="old-deja.exp=g++.old-deja/g++.robertl/eb43.C 
--target_board='unix{-m64}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="old-deja.exp=g++.old-deja/g++.robertl/eb43.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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