Commits on May 2, 2024

1. Change SIGPIPE ui from #[unix_sigpipe = "..."] to `-Zon-broken-pi… …

   …pe=...`
   
   In the stabilization attempt of `#[unix_sigpipe = "sig_dfl"]`, a concern
   was raised related to using a language attribute for the feature: Long
   term, we want `fn lang_start()` to be definable by any crate, not just
   libstd. Having a special language attribute in that case becomes
   awkward.
   
   So as a first step towards towards the next stabilization attempt, this
   PR changes the `#[unix_sigpipe = "..."]` attribute to a compiler flag
   `-Zon-broken-pipe=...` to remove that concern, since now the language
   is not "contaminated" by this feature.
   
   Another point was also raised, namely that the ui should not leak
   **how** it does things, but rather what the **end effect** is. The new
   flag uses the proposed naming. This is of course something that can be
   iterated on further before stabilization.

   

   Enselic committed May 2, 2024
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