libstdc++-8-pic-amd64-cross 8.1.0-3ubuntu1cross1 (armhf binary) in ubuntu cosmic

 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 amd64 architecture, for use in cross-compile
 environment.