Tracking issue for release notes of #129897: deprecate -Csoft-float because it is unsound (and not fixable)

[rustbot]

This issue tracks the release notes text for #129897.

Steps

• Proposed text is drafted by PR author (or team) making the noteworthy change.
• Issue is nominated for release team review of clarity for wider audience.
• Release team includes text in release notes/blog posts.

Release notes text

The responsible team for the underlying change should edit this section to replace the automatically generated link with a succinct description of what changed, drawing upon text proposed by the author (either in discussion or through direct editing).

# Compiler
- [Deprecate unsound `-Csoft-float` flag](https://github.com/rust-lang/rust/pull/129897)

Tip

Use the previous releases categories to help choose which one(s) to use.
The category will be de-duplicated with all the other ones by the release team.

More than one section can be included if needed.

cc @RalfJung, @Urgau -- origin issue/PR authors and assignees for starting to draft text

[RalfJung]

Given that this is such a niche flag, I am not sure this needs a dedicated section in the release notes.

[Urgau]

What do you mean by dedicated section? It's currently going to be a one liner in the "Compiler" section with the rest of the compiler stuff.

[RalfJung]

Yes. But these tracking issues are also about deciding whether we need a dedicated release note sections that appears in the blog post.

[Urgau]

Sure, but since you deleted the section related to the blog post you already made the decision sometime ago (hence my confusion).

(Which I agree btw, this change is way too minor to be blog post worthy)

[RalfJung]

I felt it'd be good to be explicit rather than implicit, is all. :)