[Cython] Shared utility Option vs. Compilation Directive

[matus valo]

Hi All,

Based on the comment
https://github.com/cython/cython/pull/6531#discussion_r1975502026 I would
like to start a discussion about using Option vs Compilation Directive.
Basically, we have 3 options:

1. Use PR https://github.com/cython/cython/pull/6531 as is. I will proceed
with the rest of the comments.
2. Use `Option` directly with no further changes in the Cython codebase.
This is the initial implementation. I created a branch with a version of
the  PR with rollback of all changes related to the Compilation Directive
adjustments:
https://github.com/cython/cython/compare/master...matusvalo:shared_library_option?expand=1
3. Use code changes/cleanup in https://github.com/cython/cython/pull/6646
but Shared Utility will be configured using `Option` instead of Compilation
directive (Option 2.). I am not sure it this point makes sense, only in
case that we want to keep changes by @da-woods <dw-git at d-woods.co.uk> improves
the code internals.

I would like to have an agreement on this topic before moving forward with
other comments in the PR.


Thanks,

Matus
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