[libcxx-commits] [libcxx] [libcxxabi] [libc++][RFC] Always define internal feature test macros (PR #89178)

[Louis Dionne via libcxx-commits]

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@@ -1012,16 +1040,20 @@ typedef __char32_t char32_t;
 // functions is gradually being added to existing C libraries. The conditions
 // below check for known C library versions and conditions under which these
 // functions are declared by the C library.
-#  define _LIBCPP_HAS_NO_C8RTOMB_MBRTOC8
+
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ldionne wrote:

```suggestion
//
```

https://github.com/llvm/llvm-project/pull/89178