[libcxx-commits] [libcxx] [libc++] Don't use `copy_file_impl_fstream` when not declared (PR #214706)

[Louis Dionne via libcxx-commits]

================
@@ -360,7 +360,7 @@ bool copy_file_impl(FileDescriptor& read_fd, FileDescriptor& write_fd, error_cod
   ec.clear();
   return true;
 }
-#elif defined(_LIBCPP_FILESYSTEM_USE_FSTREAM)
+#elif defined(_LIBCPP_FILESYSTEM_USE_FSTREAM) && defined(_LIBCPP_FILESYSTEM_NEED_FSTREAM)
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ldionne wrote:

```suggestion
#elif defined(_LIBCPP_FILESYSTEM_USE_FSTREAM)
```

https://github.com/llvm/llvm-project/pull/214706