mstorsjo wrote:

> > Is it expected now that `clang --print-runtime-dir` will always have the 
> > clang host triple appended even if `LLVM_ENABLE_PER_TARGET_RUNTIME_DIR` is 
> > off? I guess I was expecting to see `lib/linux` instead of 
> > `lib/x86_64-unknown-linux-gnu`.
> 
> https://reviews.llvm.org/D98868 introduced `--print-runtime-dir`. The 
> question is whether `--print-runtime-dir` should print the legacy `lib/linux` 
> when `LLVM_ENABLE_PER_TARGET_RUNTIME_DIR` is off. Personally I'd hope that 
> `--print-runtime-dir` does not try to be smart and users should be able to 
> expect that it always prints the new hierarchy.
> 
> With the old hierarchy, the user is expected to know how to derive 
> `libclang_rt.builtins-aarch64.a` from `libclang_rt.builtins.a`. In this case, 
> they can extract the directory name from `clang 
> --print-file-name=libclang_rt.builtins-aarch64.a`.

That change doesn’t seem to explicitly say that this only is intended to be 
used with the new layout, and it seems like a number of different users have 
taken up use of this option in this way, with the old layout. So this change 
does seem to affect a number of  previously seemingly fully legitimate 
configurations in practice.

https://github.com/llvm/llvm-project/pull/87866
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