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Linux, GNU GCC, ld, version scripts and the ELF binary format — How does it work?

I'm trying to learn more about library versioning in Linux and how to put it all to work. Here's the context: -- I have two versions of a dynamic library which expose the same set of interfaces, say ...
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ld.so.preload doesn't differ x86_32 and x86_64

— It's known you can run x86_32 programms with x86_64 kernel if it was compiled with support for that. But dynamic linker doesn't provide any way to define a separate set of preload libraries for ...