[libcxx-commits] [libcxx] [libc++] Fix header deprecations (PR #163356)

[Nikolas Klauser via libcxx-commits]

philnik777 wrote:

> This emits warnings for deprecated headers pulled in by system headers, e.g.:
> 
> ```
> In file included from ../../ios/chrome/browser/shared/ui/util/uikit_ui_util.mm:7:
> In file included from sdk/xcode_links/iPhoneSimulator26.0.sdk/System/Library/Frameworks/Accelerate.framework/Headers/Accelerate.h:20:
> In file included from sdk/xcode_links/iPhoneSimulator26.0.sdk/System/Library/Frameworks/Accelerate.framework/Headers/../Frameworks/vecLib.framework/Headers/vecLib.h:111:
> In file included from sdk/xcode_links/iPhoneSimulator26.0.sdk/System/Library/Frameworks/Accelerate.framework/Frameworks/vecLib.framework/Headers/vForce.h:50:
> gen/third_party/libc++/src/include/ciso646:28:6: error: <ciso646> is removed in C++20. Include <version> instead. [-Werror,-W#warnings]
>    28 | #    warning <ciso646> is removed in C++20. Include <version> instead.
> ```
> 
> That's not actionable for users.
> 
> What's a good path forward here?

Urgh. I didn't expect that. I guess #168041 is more urgent than I thought.

https://github.com/llvm/llvm-project/pull/163356