PLT symbols with `cxx-build`

Hey folks, sorry if this is the wrong place to post this, but I can't really distinguish whether this problem is related to cxx, rustc, rust-lld, or gcc, static linking or something else entirely. I'm working on a project where I'm writing a plugin for a C++ program in Rust. The program contains some header files which defines a special inline function (call it register), which is automatically called from a class constructor for a global instance instantiated in the plugin source code. For a u...