[libcxx-commits] [libcxx] [libc++] Fix Newlib check in __fwd/ios.h (PR #168952)

[Jon Roelofs via libcxx-commits]

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@@ -31,7 +31,7 @@ using wios = basic_ios<wchar_t>;
 template <class _CharT, class _Traits>
 class _LIBCPP_PREFERRED_NAME(ios) _LIBCPP_IF_WIDE_CHARACTERS(_LIBCPP_PREFERRED_NAME(wios)) basic_ios;
 
-#if defined(_NEWLIB_VERSION)
+#if _LIBCPP_HAS_NEWLIB_LIBC
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jroelofs wrote:

worth fixing all of them while you're here?

```
$ git grep defined\(_NEWLIB_VERSION ../libcxx/{include,src} | wc -l
      14
```

https://github.com/llvm/llvm-project/pull/168952