[lld] [llvm] [Object][COFF][NFC] Make writeImportLibrary NativeExports argument optional. (PR #81600)

[Jacek Caban via llvm-commits]

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@@ -135,6 +135,18 @@ struct COFFShortExport {
   }
 };
 
+/// Writes a COFF import library containing entries described by the Exports
+/// array.
+///
+/// For hybrid targets such as ARM64EC, additional native entry points can be
+/// exposed using the NativeExports parameter. When NativeExports is used, the
+/// output import library will expose these native ARM64 imports alongside the
+/// entries described in the Exports array. Such a library can be used for
+/// linking both ARM64EC and pure ARM64 objects, and the linker will pick only
+/// the exports relevant to the target platform.
+///
+/// For non-hybrid targets, the NativeExports parameter should not be used.
+/// Instead, pass std::nullopt or an empty array to this parameter.
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cjacek wrote:

Sounds good to me, I did that in the new version, thanks! As I mentioned in #81426, I'm ultimately planning to use it in all in-tree callers. But indeed, I don't expect it to be interesting for majority of downstream users and making it optional seems like a good idea.

https://github.com/llvm/llvm-project/pull/81600