[r12-6581 Regression] FAIL: g++.old-deja/g++.robertl/eb43.C -std=c++2a (test for excess errors) on Linux/x86_64

[sunil.k.pandey]

On Linux/x86_64,

de196e5dd8ea4d0ed01a8c265afdd3676e27545b is the first bad commit
commit de196e5dd8ea4d0ed01a8c265afdd3676e27545b
Author: Jonathan Wakely <jwakely@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)