Because I try to make LLVM work properly on distributions supporting multiarch installations and LLVM developers do not see the need of supporting e. g. /usr/lib and /usr/lib64 together I would like to know the LIBDIR standards of different distributions:

........................................32-bit libs
.............i586.........x86_64........on x86_64

openSUSE...../usr/lib...../usr/lib64..../usr/lib
Fedora......./usr/lib32.../usr/lib....../usr/lib32