Below are the observed impacts when linking Rust against shared libLLVM.so versus 
statically linking LLVM components.

On Native:
**********
All required LLVM-related libraries were already present in recipe-sysroot-native before switching 
Rust to dynamic LLVM. Dynamic linking does not introduce any new native dependencies. 
Existing llvm-native artifacts are reused.

Static:
-rw-r--r-- 1 xxx users 213M Feb 13 00:29 librustc_driver-4b6f2c2478f9ef2c.so

Dynamic:
-rw-r--r-- 1 xxx users 132M Feb 13 00:52 librustc_driver-4b6f2c2478f9ef2c.so

So on native we see ~81 MB reduction in librustc_driver, with no additional sysroot growth.

On Target:
**********
librustc_driver shrinks from 144.8 MB to 84.2 MB (~60 MB reduction).
However, dynamic linking introduces shared libLLVM.so plus a few runtime dependencies.

Static:
root@qemux86-64:~# ls -lh /usr/lib/librustc_driver-*.so
-rw-r--r--    1 root     root      144.8M Apr  5  2011 /usr/lib/librustc_driver-151eed90355bbdac.so

Dynamic:
root@qemux86-64:~# ls -lh /usr/lib/librustc_driver-*.so
-rw-r--r--    1 root     root       84.2M Apr  5  2011 /usr/lib/librustc_driver-151eed90355bbdac.so

New dynamic dependencies:
root@qemux86-64:~# ldd /usr/lib/librustc_driver-*.so
        libLLVM.so.21.1 libffi.so.8 libxml2.so.16

Size contribution on target:
 - libLLVM.so.21.1 ≈ 75.5 MB
 - libxml2.so.16 ≈ 1.2 MB
 - libffi.so.8 ≈ 42.5 KB

When LLVM is only used by Rust, this results in a net image increase of approximately 15–16 MB.