[libcxx-commits] [libcxx] [libcxx] Recognize __UEFI__ predefine (PR #139327)

[Prabhu Rajasekaran via libcxx-commits]

Prabhuk wrote:

> There is no such thing as using libc++ "header only". Even using basic functionality like `std::sort` requires `libc++.so` or `libc++.a` to be available, because we externally instantiate some specializations of `std::sort` into the built library. Failing to have a built library available will yield to linker errors when you do perfectly normal things like calling `std::sort(int*, int*)`.
> 
> From your comment, this target is still experimental. I would rather add support in libc++ once you have a good understanding of the changes required to libc++ to support the target, and it looks like this might be a bit early for that. Otherwise, as far as the project is concerned, this patch is introducing dead code and our policy is to reject such patches.

That's fair. I'll look at what's the level of support we need from libcxx for UEFI and bring this back up when we get there. Thank you for your inputs. 

https://github.com/llvm/llvm-project/pull/139327