File list of package lib64stdc++-7-dev in buster of architecture i386
/usr/include/i386-linux-gnu/c++/7/64/bits/atomic_word.h
/usr/include/i386-linux-gnu/c++/7/64/bits/basic_file.h
/usr/include/i386-linux-gnu/c++/7/64/bits/c++allocator.h
/usr/include/i386-linux-gnu/c++/7/64/bits/c++config.h
/usr/include/i386-linux-gnu/c++/7/64/bits/c++io.h
/usr/include/i386-linux-gnu/c++/7/64/bits/c++locale.h
/usr/include/i386-linux-gnu/c++/7/64/bits/cpu_defines.h
/usr/include/i386-linux-gnu/c++/7/64/bits/ctype_base.h
/usr/include/i386-linux-gnu/c++/7/64/bits/ctype_inline.h
/usr/include/i386-linux-gnu/c++/7/64/bits/cxxabi_tweaks.h
/usr/include/i386-linux-gnu/c++/7/64/bits/error_constants.h
/usr/include/i386-linux-gnu/c++/7/64/bits/extc++.h
/usr/include/i386-linux-gnu/c++/7/64/bits/gthr-default.h
/usr/include/i386-linux-gnu/c++/7/64/bits/gthr-posix.h
/usr/include/i386-linux-gnu/c++/7/64/bits/gthr-single.h
/usr/include/i386-linux-gnu/c++/7/64/bits/gthr.h
/usr/include/i386-linux-gnu/c++/7/64/bits/messages_members.h
/usr/include/i386-linux-gnu/c++/7/64/bits/opt_random.h
/usr/include/i386-linux-gnu/c++/7/64/bits/os_defines.h
/usr/include/i386-linux-gnu/c++/7/64/bits/stdc++.h
/usr/include/i386-linux-gnu/c++/7/64/bits/stdtr1c++.h
/usr/include/i386-linux-gnu/c++/7/64/bits/time_members.h
/usr/include/i386-linux-gnu/c++/7/64/ext/opt_random.h
/usr/lib/gcc/i686-linux-gnu/7/64/libstdc++.a
/usr/lib/gcc/i686-linux-gnu/7/64/libstdc++.so
/usr/lib/gcc/i686-linux-gnu/7/64/libstdc++_pic.a
/usr/lib/gcc/i686-linux-gnu/7/64/libstdc++fs.a
/usr/lib/gcc/i686-linux-gnu/7/64/libsupc++.a
/usr/share/doc/lib64stdc++-7-dev