On Linux/x86_64,

a110855667782dac7b674d3e328b253b3b3c919b is the first bad commit
commit a110855667782dac7b674d3e328b253b3b3c919b
Author: Martin Sebor <mse...@redhat.com>
Date:   Wed Jul 7 14:05:25 2021 -0600

    Correct handling of variable offset minus constant in -Warray-bounds 
[PR100137]

caused

FAIL: gcc.dg/Wstringop-overflow-47.c pr97027 (test for warnings, line 34)
FAIL: gcc.dg/Wstringop-overflow-47.c pr97027 (test for warnings, line 37)
FAIL: gcc.dg/Wstringop-overflow-47.c pr97027 (test for warnings, line 42)
FAIL: g++.dg/warn/Warray-bounds-20.C  -std=gnu++14 note (test for warnings, 
line 38)
FAIL: g++.dg/warn/Warray-bounds-20.C  -std=gnu++14 note (test for warnings, 
line 55)
FAIL: g++.dg/warn/Warray-bounds-20.C  -std=gnu++17 note (test for warnings, 
line 38)
FAIL: g++.dg/warn/Warray-bounds-20.C  -std=gnu++17 note (test for warnings, 
line 55)
FAIL: g++.dg/warn/Warray-bounds-20.C  -std=gnu++2a note (test for warnings, 
line 38)
FAIL: g++.dg/warn/Warray-bounds-20.C  -std=gnu++2a note (test for warnings, 
line 55)
FAIL: g++.dg/warn/Warray-bounds-20.C  -std=gnu++98 note (test for warnings, 
line 38)
FAIL: g++.dg/warn/Warray-bounds-20.C  -std=gnu++98 note (test for warnings, 
line 55)

with GCC configured with

../../gcc/configure 
--prefix=/local/skpandey/gccwork/toolwork/gcc-bisect-master/master/r12-2132/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=gcc.dg/Wstringop-overflow-47.c --target_board='unix{-m32\ 
-march=cascadelake}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="dg.exp=gcc.dg/Wstringop-overflow-47.c --target_board='unix{-m64\ 
-march=cascadelake}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="dg.exp=g++.dg/warn/Warray-bounds-20.C --target_board='unix{-m32}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="dg.exp=g++.dg/warn/Warray-bounds-20.C --target_board='unix{-m32\ 
-march=cascadelake}'"

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