/usr/ is in libstdc++6-7-dbg-x32-cross 7.3.0-16ubuntu3cross1.
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/usr/x86_64-linux-gnux32/lib/
/usr/x86_64-linux-gnux32/lib/debug/
/usr/share/
/usr/share/doc/
/usr/share/gdb/
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/usr/share/lintian/
/usr/share/lintian/overrides/
/usr/share/lintian/overrides/libstdc++6-7-dbg-x32-cross
/usr/x86_64-linux-gnux32/
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/usr/share/doc/libstdc++6-7-dbg-x32-cross
/usr/x86_64-linux-gnux32/lib/debug/libstdc++.so
/usr/x86_64-linux-gnux32/lib/debug/libstdc++.so.6