export LD_LIBRARY_PATH=/usr/lib64 export LD_PRELOAD=/usr/lib64
ld-linux-x86-64.so.2 is a pretty core part of your OS. It actually
runs every (64 bit) dynamic application. It's not a library as much as
an app itself, a handler that is called when you run an app.
Basically, when you run a dynamic app, the kernel first runs
ld-linux.so (or whatever name it is for your bitsize, distro, etc).
ld-linux.so then peers into your app, sees the libraries that you
need, sees any hard coded paths for the libraries (e.g. rpath's)
checks LD_LIBRARY_PATH, and then goes looking for all those libraries,
makes sure they match bitsizes, names, what have you. It then collects
all of those, loads them, and runs your app. If it can't find the
libs, it doesn't run your app.
ld-linux.so can not be affected by LD_LIBRARY_PATH because it is run
by the kernel, and the kernel does not load libraries like ld-linux.so
does, it just has the one it's configured to run. Again, not a
library, so don't use library semantics (LD_LIBRARY_PATH) to change
how it's called. It does have environment variables that affect it
running - see man ld-linux.so for details.
/lib/ld-linux.so.* [OPTIONS] [PROGRAM [ARGUMENTS]]
--library-path path Use path instead of LD_LIBRARY_PATH environment variable
setting (see below).
Usage: ld.so [OPTION]... EXECUTABLE-FILE [ARGS-FOR-PROGRAM...] You have invoked `ld.so', the helper program for shared library executables. This program usually lives in the file `/lib/ld.so', and special directives in executable files using ELF shared libraries tell the system's program loader to load the helper program from this file. This helper program loads the shared libraries needed by the program executable, prepares the program to run, and runs it. You may invoke this helper program directly from the command line to load and run an ELF executable file; this is like executing that file itself, but always uses this helper program from the file you specified, instead of the helper program file specified in the executable file you run. This is mostly of use for maintainers to test new versions of this helper program; chances are you did not intend to run this program. --list list all dependencies and how they are resolved --verify verify that given object really is a dynamically linked object we can handle --inhibit-cache Do not use /etc/ld.so.cache --library-path PATH use given PATH instead of content of the environment variable LD_LIBRARY_PATH --inhibit-rpath LIST ignore RUNPATH and RPATH information in object names in LIST --audit LIST use objects named in LIST as auditors
/usr/lib64/ld-linux-x86-64.so.2 --library-path /usr/lib64/ /usr/bin/ln -s /usr/lib64 /lib64