Linux So selection sequence

I.Linux dynamic library selection sequence refers:

1. CompileProgramWhen a dynamic library is used, what sequence should I look up from?

2. When running a program, you need a dynamic library. Where can I find it?

II.The order of so found during GCC compilation is as follows:

1. The path specified by parameter-l during GCC Compilation

2. Environment Variable LIBRARY_PATH

3. Default system library location/lib/usr/lib

II.The So query sequence is as follows:

1. Path of the Runtime Library specified during GCC compilation-wl,-rpath

2. Environment Variable LD_LIBRARY_PATH

3. ldconfig Cache/etc/lD. So. Cache

4. Default system library location/lib/usr/lib

What I don't quite understand is: I found a different answer from I (ii), but I don't know why...