[libcxx-commits] [libcxx] [libc++] Remove _LIBCPP_DISABLE_AVAILABILITY macro (PR #112952)

[via libcxx-commits]

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@@ -85,6 +85,9 @@ Deprecations and Removals
 - The function ``__libcpp_verbose_abort()`` is now ``noexcept``, to match ``std::terminate()``. (The combination of
   ``noexcept`` and ``[[noreturn]]`` has special significance for function effects analysis.)
 
+- The ``_LIBCPP_DISABLE_AVAILABILITY`` macro that was used to force-disable availability markup has now been removed.
+  Whether availability markup is used by the library is now solely controlled at configuration-time.
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h-vetinari wrote:

Thanks a lot for the comprehensive response here. It was a fair amount for me to chew on, which is why I ended up postponing having to deal with it a few times - apologies 😅 

I'll try to use "just the C bits" of the SDK as you describe. It sounds like a more solid approach already so I'm hoping that'll work. 🤞 

Also 💯  on the different symbol namespaces, that would have been excellent. Finally, the case you commented on in discourse really is unusual (also for us), in it's triggered by an uncommon case of flags (using `-Wl,-rpath`, but not `-L` to point to `$PREFIX/lib`, where our `libc++` lives.)

https://github.com/llvm/llvm-project/pull/112952