libstdc++-6-pic-s390x-cross 6.4.0-12ubuntu1cross2 (i386 binary) in ubuntu bionic

 This is used to develop subsets of the libstdc++ shared libraries for
 use on custom installation floppies and in embedded systems.
 .
 Unless you are making one of those, you will not need this package.
 .
 This package contains files for s390x architecture, for use in cross-compile
 environment.