[libcxx-commits] [libcxx] [libc++] Deprecates std::errc constants. (PR #80542)

[Nikolas Klauser via libcxx-commits]

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@@ -113,6 +113,15 @@ _LIBCPP_BEGIN_NAMESPACE_STD
 // for them:
 
 // enum class errc
+//
+// LWG3869 deprecates the UNIX STREAMS macros and enum values.
+// This makes the code clumbersome:
+// - the enum value is deprecated and should show a diagnostic,
+// - the macro is deprecated and should _not_ show a diagnostic in this
+//   context, and
+// - the macro is not always available.
+// This leads to the odd pushing and popping of the deprecated
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philnik777 wrote:

If a declaration itself is deprecated and uses deprecated functionality, the deprecation warning of the stuff it uses should be suppressed: https://godbolt.org/z/b839bqGj7. This looks like a Clang bug to me. Could you file one?

https://github.com/llvm/llvm-project/pull/80542