Comment by HenriTEL

All the magic seems to happen in

    const lib = b.addLibrary(.{
        .linkage = .static,
        .name = "cgo_static_linking",
        .root_module = lib_mod,
    });

and

/* #cgo LDFLAGS: -L./zig-out/lib -lcgo_static_linking -static #include "zig_lib.h" */

Now I can only guess why it works. A bit of an explanation wouldn't hurt. Good post btw