On Thu, Feb 12, 2026 at 10:36 PM, Ross Burton wrote: > > What’s the impact on the native sysroot and target packages when we link > rust against all of libLLVM.so dynamically vs statically linking the > pieces that are used?
Hi Ross, 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.
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