Re: master b99ec5d 3/3: Work around __has_attribute bug in clang 3.4

[Paul Eggert]

On 1/22/21 2:49 PM, Glenn Morris wrote:
> I can provide no more information than this, but it seems this causes
> hydra.nixos darwin builds to fail.
>
> https://hydra.nixos.org/build/135418161

When I click on that web page's line "Failed build produced output. 
Click here to inspect the output." 
<https://hydra.nixos.org/build/135418161/contents/1>, the result is a 
web page that says "404 Not Found Product 
/nix/store/3ib8nmn8wy3sqk4rk7n64j2hcvglkd6l-emacs-unknown has 
disappeared." If I click on the same web page's "Help" button it 
suggests running "curl 
https://hydra.nixos.org/build/135418161/nix/closure/emacs-unknown-none.closure.gz 
| gunzip | nix-store --import", but curl reports a 404 not found for 
that as well.

Perhaps someone who can build on macOS directly can provide more info 
about the problem. I had no problem building with clang 11.0 on Ubuntu 
but Apple's clang is special.