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Question

I just wanted to understand how shared libraries with statically linked libraries are expected to perform. I am writing a shared library ( lshared.so ) that is statically linked to another library ( lstatic ). Now, I have another executable helloworld which loads a dynamic version of library lstatic (lstatic.so) and lshared.so as well. Will the static version of library (lstatic) loaded by lshared.so and the dynamic version (lstatic.so) conflict. Will they share any global state. Tried to show it better below.

helloworld
     --> lshared.so (statically linked to lstatic at compile time)
     --> lstatic.so (hello world loads this at runtime)

To throw some context, I've to use a shared library for logging. It is possible that lshared.so is statically linked to a different version that the one available to helloworld at runtime.

Answer 1

Will the static version of library (lstatic) loaded by lshared.so and the dynamic version (lstatic.so) conflict.

Possibly.

Will they share any global state.

Possibly.

The answers depend on how exactly lshared.so is built (which symbols it exports), and how the main helloworld binary is linked.

The answers also tend to be somewhat complicated, and may depend on inlining and other optimizations, and possibly on compiler versions.

It is best to avoid doing that by using shared version of lstatic.so , where all the answers become simple.