MaskRay added a comment.

In D134337#3824683 <https://reviews.llvm.org/D134337#3824683>, @ojeda wrote:
> Thanks Nick for the ping. Indeed, `rustc` allows to use a "target 
> specification file" to create new targets that are not built-in, as a JSON 
> file.
>
> They are unstable though, since they are fairly tied to LLVM, and I think the 
> Rust compiler team prefers to stabilize flags instead.
>
> However, it would definitely be great for users and build systems if GCC, 
> Clang and `rustc` could get together and decide on a new, common config file, 
> even if it just covered the target specification.

Clang just uses a plain text file similar to a response file (which one can 
specify with `clang ... @a.rsp` before Clang got --config support).
It's unclear Clang wants to support GCC style specs file and whether GCC wants 
to adopt another system beside its specs.
I lean toward there isn't much cooperation as we might think.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D134337/new/

https://reviews.llvm.org/D134337

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