/usr/ is in libstdc++6-7-dbg-ppc64-cross 7.3.0-16ubuntu3cross1.
This file is owned by root:root, with mode 0o755.
..
/usr/powerpc64-linux-gnu/
/usr/powerpc64-linux-gnu/lib/
/usr/powerpc64-linux-gnu/lib/debug/
/usr/powerpc64-linux-gnu/lib/debug/libstdc++.a
/usr/powerpc64-linux-gnu/lib/debug/libstdc++.so.6.0.24
/usr/powerpc64-linux-gnu/lib/debug/libstdc++fs.a
/usr/share/
/usr/share/doc/
/usr/share/gdb/
/usr/share/gdb/auto-load/
/usr/share/gdb/auto-load/usr/
/usr/share/gdb/auto-load/usr/powerpc64-linux-gnu/
/usr/share/gdb/auto-load/usr/powerpc64-linux-gnu/lib/
/usr/share/gdb/auto-load/usr/powerpc64-linux-gnu/lib/debug/
/usr/share/gdb/auto-load/usr/powerpc64-linux-gnu/lib/debug/libstdc++.so.6.0.24-gdb.py
/usr/share/lintian/
/usr/share/lintian/overrides/
/usr/share/lintian/overrides/libstdc++6-7-dbg-ppc64-cross
/usr/powerpc64-linux-gnu/lib/debug/libstdc++.so
/usr/powerpc64-linux-gnu/lib/debug/libstdc++.so.6
/usr/share/doc/libstdc++6-7-dbg-ppc64-cross